OSGOOD STEVEN G

SEC source: 0001104659-26-085915 · tm2620838-11_4seq1.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common shares of beneficial interest, $0.01 par value · 142,487 shares

Expires not disclosed

F3 · security: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F3 · derivative.exercise_price: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F3 · shares: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F3 · price: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F3 · derivative.exercise_date: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F4 · derivative.expiration_date: N/A.

F3 · derivative.underlying_shares: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F3 · balance_after: Pursuant to the Merger Agreement, each Class A OP Unit issued and outstanding immediately prior to the effective time of the Partnership Merger was (i) automatically converted into the right to receive a number of newly issued common units in Public Storage OP, L.P., equal to the Exchange Ratio or (ii), at the election of holders of Class A OP Units, redeemed in exchange for one newly issued unit in NSA OP JV, LLC which holds 80% of the equity of the joint venture with Public Storage that holds certain identified real estate assets contributed by the Partnership.

F2 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001104659-26-085915 · tm2620838-11_4seq1.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · security: Pursuant to the Agreement and Plan of Merger, dated as of March 16, 2026 (the "Merger Agreement"), between the Issuer, Public Storage and certain other parties, common shares of beneficial interest, $0.01 par value of the Issuer, inclusive of restricted shares, were converted into the right to receive 0.1400 (the "Exchange Ratio") newly issued common shares of beneficial interest, par value $0.10 per share, of Public Storage and cash in lieu of any fractional shares.

F1 · price: Pursuant to the Agreement and Plan of Merger, dated as of March 16, 2026 (the "Merger Agreement"), between the Issuer, Public Storage and certain other parties, common shares of beneficial interest, $0.01 par value of the Issuer, inclusive of restricted shares, were converted into the right to receive 0.1400 (the "Exchange Ratio") newly issued common shares of beneficial interest, par value $0.10 per share, of Public Storage and cash in lieu of any fractional shares.

F1 · balance_after: Pursuant to the Agreement and Plan of Merger, dated as of March 16, 2026 (the "Merger Agreement"), between the Issuer, Public Storage and certain other parties, common shares of beneficial interest, $0.01 par value of the Issuer, inclusive of restricted shares, were converted into the right to receive 0.1400 (the "Exchange Ratio") newly issued common shares of beneficial interest, par value $0.10 per share, of Public Storage and cash in lieu of any fractional shares.

F2 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001561894-26-000127 · wk-form4_1780690388.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Steven G Osgood TTEE Steven G Osgood TR U/A DTD 09 09 2019

Disclosed balance after: 55,962

Underlying: Common stock, par value $0.01 per share · 6,861 shares

Expires not disclosed

F1 · derivative.exercise_price: 55,962 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 55,962 long-term incentive plan units ("LTIP Units") in the Partnership.

F2 · derivative.exercise_price: Vested LTIP Units, after achieving parity with OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")), are eligible to be converted into OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement. Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of HA Sustainable Infrastructure Capital, Inc. (the "Issuer"), or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: 55,962 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 55,962 long-term incentive plan units ("LTIP Units") in the Partnership.

F2 · derivative.exercise_date: Vested LTIP Units, after achieving parity with OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")), are eligible to be converted into OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement. Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of HA Sustainable Infrastructure Capital, Inc. (the "Issuer"), or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F4 · ownership.nature: These LTIP Units are held Steven G Osgood TREE Steven G Osgood TR U/A DTD 09/09/2019, of which Mr. Osgood is the trustee. Ms. Osgood possesses the voting and investment power with respect to the shares of LTIP Units held by the Trust.

SEC source: 0001628280-26-036367 · wk-form4_1779220950.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,487

Underlying: Common shares of beneficial interest, $0.01 par value · 11,451 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · security: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · derivative.exercise_price: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F6 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F7 · shares: Consists of 11,451 LTIP Units held by the Reporting Person which were converted into 11,451 Class A OP Units as described in footnote 5 above. The Reporting Person previously reported the 11,451 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 1 and 2 of Table II of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 11,451 LTIP Units into 11,451 Class A OP Units.

F6 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · derivative.exercise_date: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F6 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F8 · derivative.expiration_date: N/A

F6 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F9 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 142,487 Class A OP Units (which includes those Class A OP Units previously reported and the Class A OP Units reported herein) and 0 LTIP Units. The 142,487 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

F4 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein

SEC source: 0001628280-26-036367 · wk-form4_1779220950.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Class A OP Units · 11,451 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · security: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · derivative.exercise_price: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F6 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F7 · shares: Consists of 11,451 LTIP Units held by the Reporting Person which were converted into 11,451 Class A OP Units as described in footnote 5 above. The Reporting Person previously reported the 11,451 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 1 and 2 of Table II of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 11,451 LTIP Units into 11,451 Class A OP Units.

F5 · price: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · derivative.exercise_date: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F6 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F8 · derivative.expiration_date: N/A

F5 · derivative.underlying: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F6 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person has the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of Shares, or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: Long-term incentive plan units ("LTIP Units") in the Partnership, after achieving parity with Class A common units of limited partner interest in the Partnership ("Class A OP Units"), are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F9 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 142,487 Class A OP Units (which includes those Class A OP Units previously reported and the Class A OP Units reported herein) and 0 LTIP Units. The 142,487 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

F4 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein

SEC source: 0001628280-26-036367 · wk-form4_1779220950.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 5,232

F1 · security: Consists of 5,232 restricted common shares of beneficial interest, $0.01 par value of the Issuer ("Restricted Shares"). The Restricted Shares were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest scheduled to vest the earlier of: (i) May 15, 2027, (ii) the calendar day immediately preceding the next annual meeting of shareholders or (iii) immediately prior to the Company Merger Effective Time (as such term is defined in that certain Agreement of Plan and Merger, dated as of March 16, 2026, by and among the Issuer, NSA OP, LP (the "Partnership"), Public Storage, Public Storage OP, L.P., Pelican Merger Sub I, LLC and Pelican Merger Sub II, LLC, as the same may be amended).

F1 · shares: Consists of 5,232 restricted common shares of beneficial interest, $0.01 par value of the Issuer ("Restricted Shares"). The Restricted Shares were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest scheduled to vest the earlier of: (i) May 15, 2027, (ii) the calendar day immediately preceding the next annual meeting of shareholders or (iii) immediately prior to the Company Merger Effective Time (as such term is defined in that certain Agreement of Plan and Merger, dated as of March 16, 2026, by and among the Issuer, NSA OP, LP (the "Partnership"), Public Storage, Public Storage OP, L.P., Pelican Merger Sub I, LLC and Pelican Merger Sub II, LLC, as the same may be amended).

F2 · price: The closing price of the Issuer's common shares of beneficial interest, $0.01 par value ("Shares") on May 14, 2026.

F1 · balance_after: Consists of 5,232 restricted common shares of beneficial interest, $0.01 par value of the Issuer ("Restricted Shares"). The Restricted Shares were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest scheduled to vest the earlier of: (i) May 15, 2027, (ii) the calendar day immediately preceding the next annual meeting of shareholders or (iii) immediately prior to the Company Merger Effective Time (as such term is defined in that certain Agreement of Plan and Merger, dated as of March 16, 2026, by and among the Issuer, NSA OP, LP (the "Partnership"), Public Storage, Public Storage OP, L.P., Pelican Merger Sub I, LLC and Pelican Merger Sub II, LLC, as the same may be amended).

F3 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transaction in this class of securities is 5,232 Shares. The 5,232 Shares does not include derivative securities of the Reporting Person that have been previously reported on the Reporting Person's Forms 3 and Forms 4.

F4 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein

SEC source: 0001561894-25-000085 · wk-form4_1749243846.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Steven G Osgood TTEE Steven G Osgood TR U/A DTD 09 09 2019

Disclosed balance after: 49,101

Underlying: Common stock, par value $0.01 per share · 9,975 shares

Expires not disclosed

F1 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of HA Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F2 · derivative.exercise_price: 49,101 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 49,101 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F1 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of HA Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F2 · derivative.exercise_date: 49,101 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 49,101 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F3 · derivative.expiration_date: N/A

F4 · ownership.nature: These LTIP Units are held Steven G Osgood TREE Steven G Osgood TR U/A DTD 09/09/2019, of which Mr. Osgood is the trustee. Ms. Osgood possesses the voting and investment power with respect to the shares of LTIP Units held by the Trust.

SEC source: 0001628280-25-026631 · wk-form4_1747692573.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,487

Underlying: Common shares of beneficial interest, $0.01 par value · 3,763 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F7 · shares: Consists of 3,763 LTIP Units held by the Reporting Person which were converted into 3,763 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 3,763 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 3,763 LTIP Units into 3,763 Class A OP Units.

F2 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 142,487 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 10,214 vested LTIP Units and 6,429 unvested LTIP Units. The 142,487 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001628280-25-026631 · wk-form4_1747692573.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 16,643

Underlying: Class A OP Units · 3,763 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F7 · shares: Consists of 3,763 LTIP Units held by the Reporting Person which were converted into 3,763 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 3,763 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 3,763 LTIP Units into 3,763 Class A OP Units.

F1 · price: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_date: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 142,487 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 10,214 vested LTIP Units and 6,429 unvested LTIP Units. The 142,487 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001628280-25-026631 · wk-form4_1747692573.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 142,487

Underlying: Common shares of beneficial interest, $0.01 par value · 6,429 shares

Expires not disclosed

F1 · security: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 14, 2025.

F1 · derivative.exercise_date: The 6,429 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,429 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 15, 2026 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem all or a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 142,487 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 10,214 vested LTIP Units and 6,429 unvested LTIP Units. The 142,487 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001561894-24-000084 · wk-form4_1717790869.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Steven G Osgood TTEE Steven G Osgood TR U/A DTD 09 09 2019

Disclosed balance after: 39,126

Underlying: Common stock, par value $0.01 per share · 11,829 shares

Expires not disclosed

F1 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F2 · derivative.exercise_price: 39,126 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 39,126 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: 39,126 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 39,126 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F3 · derivative.expiration_date: N/A

F4 · ownership.nature: These LTIP Units are held Steven G Osgood TREE Steven G Osgood TR U/A DTD 09/09/2019, of which Mr. Osgood is the trustee. Ms. Osgood possesses the voting and investment power with respect to the shares of LTIP Units held by the Trust.

SEC source: 0001628280-24-024360 · wk-form4_1716236666.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 136,058

Underlying: Common shares of beneficial interest, $0.01 par value · 5,022 shares

Expires not disclosed

F1 · security: The 5,022 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,022 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 16, 2025 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,022 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,022 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 16, 2025 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 5,022 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,022 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 16, 2025 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 16, 2024.

F1 · derivative.exercise_date: The 5,022 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,022 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2024 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 16, 2025 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 136,058 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 8,955 vested LTIP Units and 5,022 unvested LTIP Units. The 136,058 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001628280-23-020344 · wk-form4_1685565823.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,036

Underlying: Common shares of beneficial interest, $0.01 par value · 3,781 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F7 · shares: Consists of 3,781 LTIP Units held by the Reporting Person which were converted into 3,781 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 3,781 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 3,781 LTIP Units into 3,781 Class A OP Units.

F2 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 131,036 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 3,763 vested LTIP Units and 5,192 unvested LTIP Units. The 131,036 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001628280-23-020344 · wk-form4_1685565823.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 8,955

Underlying: Class A OP Units · 3,781 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F7 · shares: Consists of 3,781 LTIP Units held by the Reporting Person which were converted into 3,781 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 3,781 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 3,781 LTIP Units into 3,781 Class A OP Units.

F1 · price: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_date: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 131,036 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 3,763 vested LTIP Units and 5,192 unvested LTIP Units. The 131,036 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001628280-23-020344 · wk-form4_1685565823.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 131,036

Underlying: Common shares of beneficial interest, $0.01 par value · 5,192 shares

Expires not disclosed

F1 · security: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 24, 2023.

F1 · derivative.exercise_date: The 5,192 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,192 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 23, 2024 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 131,036 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 3,763 vested LTIP Units and 5,192 unvested LTIP Units. The 131,036 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported

F6 · ownership.nature: Held by Steven Osgood TTEE Steven G. Osgood Trust dated 09/09/2019 for which the Reporting Person has voting and/or investment power. This filing shall not be deemed to be an admission that the Reporting Person is the beneficial owner of any of the securities reported herein, and the Reporting Person disclaims beneficial ownership of such securities except to the extent of the Reporting Person's pecuniary interest therein.

SEC source: 0001561894-23-000055 · wf-form4_167910186928495.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Steven G Osgood TTEE Steven G Osgood TR U/A DTD 09 09 2019

Disclosed balance after: 27,297

Underlying: Common stock, par value $0.01 per share · 7,973 shares

Expires not disclosed

F1 · derivative.exercise_price: 27,297 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 27,297 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: 27,297 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 27,297 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F3 · derivative.expiration_date: N/A

F4 · ownership.nature: These LTIP Units are held Steven G Osgood TREE Steven G Osgood TR U/A DTD 09/09/2019, of which Mr. Osgood is the trustee. Ms. Osgood possesses the voting and investment power with respect to the shares of LTIP Units held by the Trust.

SEC source: 0001561894-22-000099 · wf-form4_166813055282871.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,281

SEC source: 0001628280-22-015921 · wf-form4_165411518375706.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,844

Underlying: Common shares of beneficial interest, $0.01 par value · 7,256 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_price: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 7,256 LTIP Units held by the Reporting Person which were converted into 7,256 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 7,256 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 7,256 LTIP Units into 7,256 Class A OP Units.

F2 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 125,844 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 3,781 vested LTIP Units and 3,763 unvested LTIP Units. The 125,844 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001628280-22-015921 · wf-form4_165411518375706.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,544

Underlying: Class A OP Units · 7,256 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_price: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 7,256 LTIP Units held by the Reporting Person which were converted into 7,256 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 7,256 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 7,256 LTIP Units into 7,256 Class A OP Units.

F1 · price: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_date: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 125,844 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 3,781 vested LTIP Units and 3,763 unvested LTIP Units. The 125,844 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001628280-22-015921 · wf-form4_165411518375706.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,844

Underlying: Common shares of beneficial interest, $0.01 par value · 3,763 shares

Expires not disclosed

F1 · security: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_price: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 27, 2022.

F1 · derivative.exercise_date: The 3,763 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,763 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 24, 2023 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 125,844 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 125,844 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 3,781 vested LTIP Units and 3,763 unvested LTIP Units. The 125,844 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001561894-22-000034 · wf-form4_164859284862710.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,346

Underlying: Common stock, par value $0.01 per share · 5,099 shares

Expires not disclosed

F1 · derivative.exercise_price: 9,346 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,346 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: 9,346 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,346 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

SEC source: 0001618563-21-000095 · wf-form4_162266519341834.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,081

Underlying: Common shares of beneficial interest, $0.01 par value · 5,116 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_price: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 5,116 LTIP Units held by the Reporting Person which were converted into 5,116 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 5,116 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 5,116 LTIP Units into 5,116 Class A OP Units.

F2 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 122,081 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 7,256 vested LTIP Units and 3,781 unvested LTIP Units. The 122,081 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-21-000095 · wf-form4_162266519341834.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,037

Underlying: Class A OP Units · 5,116 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_price: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 5,116 LTIP Units held by the Reporting Person which were converted into 5,116 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 5,116 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 5,116 LTIP Units into 5,116 Class A OP Units.

F1 · price: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_date: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 122,081 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 7,256 vested LTIP Units and 3,781 unvested LTIP Units. The 122,081 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-21-000095 · wf-form4_162266519341834.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,081

Underlying: Common shares of beneficial interest, $0.01 par value · 3,781 shares

Expires not disclosed

F1 · security: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F1 · derivative.exercise_price: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 26, 2021.

F1 · derivative.exercise_date: The 3,781 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 3,781 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. All of the Reporting Person's 122,081 Class A OP Units are held directly through Steven Osgood, TTEE Steven G. Osgood Trust dated 9/9/2019.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 122,081 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 7,256 vested LTIP Units and 3,781 unvested LTIP Units. The 122,081 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001561894-21-000072 · wf-form4_161765940304573.xml · derivative · entry 4

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,247

Underlying: Common stock, par value $0.01 per share · 4,247 shares

Expires not disclosed

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F6 · derivative.exercise_price: 4,247 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 4,247 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F6 · derivative.exercise_date: 4,247 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 4,247 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F4 · derivative.expiration_date: N/A

SEC source: 0001561894-21-000072 · wf-form4_161765940304573.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Steven G Osgood TTEE Steven G Osgood TR U/A DTD 09 09 2019

Disclosed balance after: 9,978

Underlying: Common stock, par value $0.01 per share · 9,978 shares

Expires not disclosed

F1 · derivative.exercise_price: 9,978 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,978 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: 9,978 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,978 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F4 · derivative.expiration_date: N/A

F5 · ownership.nature: These LTIP Units are held Steven G Osgood TREE Steven G Osgood TR U/A DTD 09/09/2019, of which Mr. Osgood is the trustee. Ms. Osgood possesses the voting and investment power with respect to the shares of LTIP Units held by the Trust.

SEC source: 0001561894-21-000072 · wf-form4_161765940304573.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common stock, par value $0.01 per share · 9,978 shares

Expires not disclosed

F1 · derivative.exercise_price: 9,978 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,978 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F3 · kind: 9,978 OP Units were transferred to Steven G Osgood TTEE Steven G Osgood TR U/A DTD 09/09/2019 on December 4, 2020.

F1 · derivative.exercise_date: 9,978 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,978 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F4 · derivative.expiration_date: N/A

SEC source: 0001618563-20-000102 · wf-form4_159061139752181.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 118,300

Underlying: Common shares of beneficial interest, $0.01 par value · 8,253 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 8,253 LTIP Units held by the Reporting Person which were converted into 8,253 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 8,253 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 8,253 LTIP Units into 8,253 Class A OP Units.

F2 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 118,300 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 5,670 vested LTIP Units and 6,702 unvested LTIP Units. The 118,300 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-20-000102 · wf-form4_159061139752181.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,372

Underlying: Class A OP Units · 8,253 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 8,253 LTIP Units held by the Reporting Person which were converted into 8,253 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 8,253 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 8,253 LTIP Units into 8,253 Class A OP Units.

F1 · price: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_date: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 118,300 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 5,670 vested LTIP Units and 6,702 unvested LTIP Units. The 118,300 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-20-000102 · wf-form4_159061139752181.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 118,300

Underlying: Common shares of beneficial interest, $0.01 par value · 6,702 shares

Expires not disclosed

F1 · security: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 19, 2020.

F1 · derivative.exercise_date: The 6,702 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 6,702 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 18, 2021. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 118,300 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 5,670 vested LTIP Units and 6,702 unvested LTIP Units. The 118,300 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001561894-20-000076 · wf-form4_158595063712601.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,978

Underlying: Common stock, par value $0.01 per share · 5,968 shares

Expires not disclosed

F1 · derivative.exercise_price: 9,978 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,978 long-term incentive plan units("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2013 Equity Incentive Plan, as amended, and 4,010 are scheduled to vest on May 15, 2020 and 5,698 arescheduled to vest on May 15, 2021. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement ofLimited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to themarket value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: 9,978 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 9,978 long-term incentive plan units("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2013 Equity Incentive Plan, as amended, and 4,010 are scheduled to vest on May 15, 2020 and 5,698 arescheduled to vest on May 15, 2021. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement ofLimited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to themarket value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"),or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

SEC source: 0001618563-20-000018 · wf-form4_158258232724338.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,598

Underlying: Common shares of beneficial interest, $0.01 par value · 554 shares

Expires not disclosed

F1 · security: The 554 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 554 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on April 1, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 554 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 554 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on April 1, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 554 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 554 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on April 1, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on February 20, 2020.

F1 · derivative.exercise_date: The 554 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 554 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on April 1, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 111,598 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct beneficial ownership in 8,253 vested LTIP Units and 5,670 unvested LTIP Units. The 111,598 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-19-000077 · wf-form4_155908350829759.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,044

Underlying: Common shares of beneficial interest, $0.01 par value · 3,135 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 3,135 LTIP Units held by the Reporting Person which were converted into 3,135 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 3,135 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 3,135 LTIP Units into 3,135 Class A OP Units.

F2 · price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · derivative.exercise_date: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 111,044 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 8,253 vested LTIP Units and 5,116 unvested LTIP Units. The 111,044 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-19-000077 · wf-form4_155908350829759.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,369

Underlying: Class A OP Units · 3,135 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 3,135 LTIP Units held by the Reporting Person which were converted into 3,135 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 3,135 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 3,135 LTIP Units into 3,135 Class A OP Units.

F1 · price: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_date: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · balance_after: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 111,044 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 8,253 vested LTIP Units and 5,116 unvested LTIP Units. The 111,044 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001618563-19-000077 · wf-form4_155908350829759.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,044

Underlying: Common shares of beneficial interest, $0.01 par value · 5,116 shares

Expires not disclosed

F1 · security: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 23, 2019.

F1 · derivative.exercise_date: The 5,116 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,116 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 22, 2020. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 111,044 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 8,253 vested LTIP Units and 5,116 unvested LTIP Units. The 111,044 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001561894-19-000051 · wf-form4_155432679724674.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,010

Underlying: Common stock, par value $0.01 per share · 4,010 shares

Expires not disclosed

F1 · derivative.exercise_price: 4,010 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 4,010 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2013 Equity Incentive Plan, as amended, and are scheduled to vest on May 15, 2020. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_price: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"), or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F1 · shares: 4,010 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 4,010 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2013 Equity Incentive Plan, as amended, and are scheduled to vest on May 15, 2020. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F1 · derivative.exercise_date: 4,010 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 4,010 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2013 Equity Incentive Plan, as amended, and are scheduled to vest on May 15, 2020. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.exercise_date: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"), or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying_shares: 4,010 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon vesting and the conversion of 4,010 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2013 Equity Incentive Plan, as amended, and are scheduled to vest on May 15, 2020. Vested LTIP Units, after achieving parity with OP Units, are eligible to be converted into OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")) on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement.

F2 · derivative.underlying_shares: Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Issuer"), or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments.

SEC source: 0001561894-18-000076 · wf-form4_152814488919388.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,281

SEC source: 0001618563-18-000068 · wf-form4_152762611236624.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 105,928

Underlying: Common shares of beneficial interest, $0.01 par value · 5,589 shares

Expires not disclosed

F1 · security: The 5,589 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,589 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2019. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 5,589 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,589 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2019. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 5,589 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,589 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2019. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 24, 2018.

F1 · derivative.exercise_date: The 5,589 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 5,589 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2019. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 105,928 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct beneficial ownership in 5,799 vested LTIP Units and 5,589 unvested LTIP Units. The 105,928 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0001561894-18-000041 · wf-form4_152305045997310.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,281

F1 · price: On April 4, 2018, the reporting person was granted 3,401 shares of restricted Common Stock that were issued pursuant to the 2013 Hannon Armstrong Sustainable Infrastructure Capital Inc. Equity Incentive Plan, as amended. The shares vest on March 5, 2020.

SEC source: 0001618563-17-000077 · wf-form4_149643567655221.xml · derivative · entry 3

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,339

Underlying: Common shares of beneficial interest, $0.01 par value · 14,400 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 14,400 vested LTIP Units held by the Reporting Person which were converted into 14,400 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 14,400 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, the conversion described in this Form 4 is being reported on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 14,400 LTIP Units into 14,400 Class A OP Units.

F1 · price: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_date: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 100,339 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct beneficial ownership in 3,135 vested LTIP Units and 2,664 unvested LTIP Units. The 100,339 Class A OP Units do not include derivative securities of other classes or non-derivative securities of the Reporting Person that were previously reported.

F6 · balance_after: Consists of 14,400 vested LTIP Units held by the Reporting Person which were converted into 14,400 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 14,400 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, the conversion described in this Form 4 is being reported on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 14,400 LTIP Units into 14,400 Class A OP Units.

SEC source: 0001618563-17-000077 · wf-form4_149643567655221.xml · derivative · entry 2

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,799

Underlying: Class A OP Units · 14,400 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F6 · shares: Consists of 14,400 vested LTIP Units held by the Reporting Person which were converted into 14,400 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 14,400 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, the conversion described in this Form 4 is being reported on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 14,400 LTIP Units into 14,400 Class A OP Units.

F1 · price: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_date: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F1 · derivative.underlying: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F5 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 100,339 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct beneficial ownership in 3,135 vested LTIP Units and 2,664 unvested LTIP Units. The 100,339 Class A OP Units do not include derivative securities of other classes or non-derivative securities of the Reporting Person that were previously reported.

F6 · balance_after: Consists of 14,400 vested LTIP Units held by the Reporting Person which were converted into 14,400 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 14,400 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, the conversion described in this Form 4 is being reported on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 14,400 LTIP Units into 14,400 Class A OP Units.

SEC source: 0001618563-17-000077 · wf-form4_149643567655221.xml · derivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,339

Underlying: Common shares of beneficial interest, $0.01 par value · 2,664 shares

Expires not disclosed

F1 · security: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F1 · derivative.exercise_price: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_price: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F1 · shares: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F4 · price: The price of the derivative securities was determined using the three-day trailing average closing price of the Issuer's Shares on May 24, 2017.

F1 · derivative.exercise_date: The 2,664 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") are issuable upon the conversion of 2,664 long-term incentive plan units ("LTIP Units") in the Partnership. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on May 23, 2018. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership.

F2 · derivative.exercise_date: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F3 · derivative.expiration_date: N/A

F2 · derivative.underlying: Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments.

F5 · balance_after: The Reporting Person's total direct beneficial ownership following the reported transactions above is 100,339 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those securities convertible into, or exchangeable for, such Class A OP Units as specified herein and therein). Following the reported transactions, the Reporting Person has total direct beneficial ownership in 3,135 vested LTIP Units and 2,664 unvested LTIP Units. The 100,339 Class A OP Units do not include derivative securities of other classes or non-derivative securities of the Reporting Person that were previously reported.

SEC source: 0000899243-17-008023 · doc4.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,880

F1 · price: On March 15, 2017, the reporting person was granted 3,426 shares of restricted Common Stock that were issued pursuant to the 2013 Hannon Armstrong Sustainable Infrastructure Capital Inc. Equity Incentive Plan, as amended. The shares vest on March 5, 2019.

SEC source: 0000899243-16-035644 · doc4.xml · nonDerivative · entry 1

OSGOOD STEVEN G · CIK 0001306273 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,454