Revers Daniel R

SEC source: 0001213900-23-096913 · ownership.xml · nonDerivative · entry 2

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 1,776,117

F1 · shares: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $5.25 to $5.60, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F1 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $5.25 to $5.60, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F2 · ownership.nature: On December 15, 2023, 830,197 of the reported securities were sold by ArcLight CTC Holdings II, L.P., a Delaware limited partnership (the "Sponsor"), and 8,359 of the reported securities were sold by ACTC Holdings GP II, LLC, a Delaware limited liability company and general partner of the Sponsor ("ACTC GP"). After giving effect to such transactions, the reported securities consist of (i) 1,395,135 shares of Class A common stock held directly by the Sponsor, (ii) 322,227 shares of Class A common stock held directly by ACHP B, L.P., a Delaware limited partnership ("ACHP B") and (iii) 58,755 shares of Class A common stock held directly by ACTC GP. Mr. Revers has voting and investment discretion with respect to the securities held by the Sponsor, ACHP B and ACTC GP, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interest therein.

SEC source: 0001213900-23-096913 · ownership.xml · nonDerivative · entry 1

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 619,731

F1 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $5.25 to $5.60, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

SEC source: 0001013762-23-006937 · ownership.xml · nonDerivative · entry 2

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 2,611,673

F1 · kind: On October 25, 2023, the reported securities were distributed to an equity owner of the Sponsor (as defined below) for no consideration.

F1 · price: On October 25, 2023, the reported securities were distributed to an equity owner of the Sponsor (as defined below) for no consideration.

F2 · ownership.nature: After giving effect to such distribution, the reported securities consist of (i) 2,225,332 shares of Class A common stock held directly by ArcLight CTC Holdings II, L.P., a Delaware limited partnership (the "Sponsor"), (ii) 322,227 shares of Class A common stock held directly by ACHP B, L.P., a Delaware limited partnership ("ACHP B"), and (iii) 67,114 shares of Class A common stock held directly by ACTC Holdings GP II, LLC, a Delaware limited liability company and general partner of the Sponsor ("ACTC GP"). Mr. Revers has voting and investment discretion with respect to the securities held by the Sponsor, ACHP B and ACTC GP, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interest therein.

SEC source: 0001013762-23-005149 · ownership.xml · nonDerivative · entry 3

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 386,341

F1 · kind: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $7.50 to $8.00, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F1 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $7.50 to $8.00, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F3 · ownership.nature: 9,008 of the reported securities were sold by ACHP B, L.P. a Delaware limited partnership ("ACHP B") and 2,458 of the reported securities were sold by ACTC Holdings GP II, LLC, ("ACTC GP"), the general partner of the Sponsor. After giving effect to such transactions, the reported securities consist of (i) 322,227 shares of Class A common stock held directly by ACHP B and (ii) 67,114 shares of Class A common stock held directly by ACTC GP. Mr. Revers has voting and investment discretion with respect to the securities held directly by ACHP B and ACTC GP, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

SEC source: 0001013762-23-005149 · ownership.xml · nonDerivative · entry 2

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 2,273,097

F1 · kind: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $7.50 to $8.00, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F1 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $7.50 to $8.00, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F2 · ownership.nature: The reported 2,273,097 shares of Class A common stock are held directly by ArcLight CTC Holdings II, L.P., a Delaware limited partnership (the "Sponsor"). Mr. Revers has voting and investment discretion with respect to the securities held by the Sponsor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interest therein.

SEC source: 0001013762-23-005149 · ownership.xml · nonDerivative · entry 1

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,281,175

F1 · kind: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $7.50 to $8.00, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

F1 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $7.50 to $8.00, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in this footnote.

SEC source: 0001213900-23-048163 · ownership.xml · nonDerivative · entry 3

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 487,776

F4 · kind: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.23 and $6.29, inclusive.

F4 · price: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.23 and $6.29, inclusive.

F5 · ownership.nature: The reported securities were sold by Revers Special Ops Holdings, LLC, a Delaware limited liability company ("Special Ops Holdings"). After giving effect to such transaction, the reported securities consists of (i) 331,235 shares of Class A common stock held directly by ACHP B, L.P., a Delaware limited partnership ("ACHP B"), (ii) 69,572 shares of Class A common stock held directly by ACTC Holdings GP II, LLC, a Delaware limited liability company and general partner of the Sponsor ("ACTC GP"), and (iii) 86,969 shares of Class A common stock held directly by Special Ops Holdings.

F6 · ownership.nature: (continued from footnote 5) Mr. Revers has voting and investment discretion with respect to the securities held by ACHP B, ACTC GP and Special Ops Holdings, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-048163 · ownership.xml · nonDerivative · entry 2

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,316,388

F2 · kind: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $6.23 to $6.31, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in footnotes (2) and (4) of this Form 4.

F2 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $6.23 to $6.31, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in footnotes (2) and (4) of this Form 4.

F3 · ownership.direct: The reported securities include 1,316,388 shares which were previously reported as indirectly held but were received in a distribution by the Sponsor on April 27, 2023.

SEC source: 0001213900-23-047608 · ownership.xml · nonDerivative · entry 5

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 492,178

F7 · kind: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.21 and $6.39, inclusive.

F7 · price: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.21 and $6.39, inclusive.

F9 · ownership.nature: The reported securities were sold by Special Ops Holdings. After giving effect to such transaction, the reported securities consists of (i) 331,235 shares of Class A common stock held directly by ACHP B, L.P., a Delaware limited partnership ("ACHP B"), (ii) 69,572 shares of Class A common stock held directly by ACTC Holdings GP II, LLC, a Delaware limited liability company and general partner of the Sponsor ("ACTC GP"), and (iii) 91,371 shares of Class A common stock held directly by Revers Special Ops Holdings, LLC, a Delaware limited liability company ("Special Ops Holdings").

F10 · ownership.nature: (continued from footnote 9) Mr. Revers has voting and investment discretion with respect to the securities held by ACHP B, ACTC GP and Special Ops Holdings, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-047608 · ownership.xml · nonDerivative · entry 4

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,323,662

F7 · kind: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.21 and $6.39, inclusive.

F7 · price: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.21 and $6.39, inclusive.

F8 · ownership.direct: The reported securities include 1,323,662 shares which were previously reported as indirectly held but were received in a distribution by the Sponsor on April 27, 2023.

SEC source: 0001213900-23-047608 · ownership.xml · nonDerivative · entry 3

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 497,178

F4 · kind: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.22 and $6.33, inclusive.

F4 · price: The reported price is a VWAP. The reported securities were sold in open market transactions at prices ranging from $6.22 and $6.33, inclusive.

F5 · ownership.nature: The reported securities were sold by Revers Special Ops Holdings, LLC, a Delaware limited liability company ("Special Ops Holdings"). After giving effect to such transaction, the reported securities consists of (i) 331,235 shares of Class A common stock held directly by ACHP B, L.P., a Delaware limited partnership ("ACHP B"), (ii) 69,572 shares of Class A common stock held directly by ACTC Holdings GP II, LLC, a Delaware limited liability company and general partner of the Sponsor ("ACTC GP"), and (iii) 96,371 shares of Class A common stock held directly by Special Ops Holdings.

F6 · ownership.nature: (continued from footnote 5) Mr. Revers has voting and investment discretion with respect to the securities held by ACHP B, ACTC GP and Special Ops Holdings, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.

SEC source: 0001213900-23-047608 · ownership.xml · nonDerivative · entry 2

Revers Daniel R · CIK 0001405456 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,333,662

F2 · kind: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $6.22 to $6.34, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in footnotes (4) and (7) of this Form 4.

F2 · price: The reported price is a volume weighted average price ("VWAP"). The reported securities were sold in open market transactions at prices ranging from $6.22 to $6.34, inclusive. The reporting person undertakes to provide to the SEC, the Issuer or any stockholder of the Issuer, upon request, the relevant amount of shares sold to the market at each price within the ranges set forth in footnotes (4) and (7) of this Form 4.

F3 · ownership.direct: The reported securities include 1,333,662 shares which were previously reported as indirectly held but were received in a distribution by the Sponsor on April 27, 2023.

SEC source: 0001213900-21-032809 · ownership.xml · derivative · entry 5

Revers Daniel R · CIK 0001405456 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 7,550,000

Underlying: Common Stock · 7,550,000 shares

Expires not disclosed

F4 · derivative.exercise_price: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F4 · kind: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F4 · price: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F4 · derivative.exercise_date: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F4 · derivative.expiration_date: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F4 · derivative.underlying_shares: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F4 · balance_after: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F1 · ownership.direct: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F4 · ownership.direct: In connection with the Domestication, 7,550,000 of the private placement warrants of the Company ("ArcLight Private Placement Warrants") held by Sponsor, which previously entitled Sponsor to purchase one Class A Ordinary Share at a price of $11.50 per whole share at any time commencing on the later of one year from the closing of the Company's initial public offering or 30 days after the completion of an initial business combination of the Company, were converted into private placement warrants of Proterra (each a "New Proterra Private Placement Warrant") simultaneously with the closing of the Business Combination, with each whole New Proterra Private Placement Warrant entitling the holder thereof to the right to purchase one share of New Proterra Common Stock.

F1 · ownership.nature: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

SEC source: 0001213900-21-032809 · ownership.xml · derivative · entry 4

Revers Daniel R · CIK 0001405456 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 6,797,500 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 · derivative.exercise_price: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F1 · kind: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F2 · price: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F1 · derivative.exercise_date: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F1 · derivative.expiration_date: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F1 · derivative.underlying_shares: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F1 · balance_after: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F1 · ownership.direct: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F1 · ownership.nature: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

SEC source: 0001213900-21-032809 · ownership.xml · nonDerivative · entry 3

Revers Daniel R · CIK 0001405456 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 7,397,072

F2 · kind: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · kind: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F2 · price: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · price: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F1 · ownership.direct: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F2 · ownership.direct: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · ownership.direct: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F1 · ownership.nature: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

SEC source: 0001213900-21-032809 · ownership.xml · nonDerivative · entry 2

Revers Daniel R · CIK 0001405456 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 6,797,072

F2 · kind: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · kind: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F2 · price: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · price: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F1 · ownership.direct: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F2 · ownership.direct: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · ownership.direct: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F1 · ownership.nature: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

SEC source: 0001213900-21-032809 · ownership.xml · nonDerivative · entry 1

Revers Daniel R · CIK 0001405456 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 6,797,500

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.

F2 · kind: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · kind: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F2 · price: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · price: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F1 · ownership.direct: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

F2 · ownership.direct: Pursuant to the Agreement and Plan of Merger, dated January 11, 2021, by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (the "Company"), Phoenix Merger Sub, Inc., a Delaware corporation, and Proterra Inc, a Delaware corporation ("Proterra"), the parties effected a business combination transaction ("Business Combination") on June 14, 2021. In connection with the Business Combination, the Company domesticated as a Delaware corporation (the "Domestication") and changed its name to "Proterra Inc" ("New Proterra"). In connection with the Domestication, 6,797,500 of Sponsor's Class B ordinary shares, par value $0.0001, of the Company, which were previously convertible into Class A ordinary shares, par value $0.0001, of the Company ("Class A ordinary shares") converted into shares of common stock, par value $0.0001, of New Proterra ("New Proterra Common Stock") simultaneously with the closing of the Business Combination.

F3 · ownership.direct: Continuation of Footnote 2: Sponsor then forfeited and surrendered for no consideration 428 shares of New Proterra Common Stock. After giving effect to this transaction, Daniel R. Revers will own less than 10% of the outstanding common stock of New Proterra. In connection with the consummation of the Business Combination and pursuant to the subscription agreement between ArcLight Investor and the Company, ArcLight Investor acquired 600,000 shares of New Proterra Common Stock for an aggregate purchase price of $6,000,000.

F1 · ownership.nature: 7,397,072 shares of common stock, par value $0.0001 ("New Proterra Common Stock"), of New Proterra (as defined below) are held directly by ArcLight CTC Holdings, L.P. a Delaware limited liability partnership (the "Sponsor") and 600,000 shares of New Proterra Common Stock are held directly by ArcLight CTC Investors, LLC, a Delaware limited liability company ("ArcLight Investor"). Daniel R. Revers has voting and investment discretion with respect to the securities held by each of the Sponsor and ArcLight Investor, and thus may be deemed to have beneficial ownership of such securities. Mr. Revers expressly disclaims any such beneficial ownership of such securities, except to the extent of his individual pecuniary interests therein. The business address of Sponsor, ArcLight Investor and Mr. Revers is 200 Clarendon Street, 55th Floor, Boston, MA, 02116.

SEC source: 0000899243-21-018956 · doc4.xml · derivative · entry 1

Revers Daniel R · CIK 0001405456 · Director · Chairman · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By ArcLight CTC Holdings II, L.P.

Disclosed balance after: 6,920,326

Underlying: Class A ordinary shares · 127,174 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F1 · kind: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: The securities reported herein are held directly by the Sponsor. The reporting person has voting and investment discretion with respect to the securities held by the the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

SEC source: 0000899243-22-004660 · doc4a.xml · derivative · entry 1

Revers Daniel R · CIK 0001405456 · Director · Chairman · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By ArcLight CTC Holdings II, L.P.

Disclosed balance after: 7,639,076

Underlying: Class A ordinary shares · 127,174 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F1 · kind: This Form 4 reflects the surrender to the issuer of 127,174 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings II, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333-252730).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: The securities reported herein are held directly by the Sponsor. The reporting person has voting and investment discretion with respect to the securities held by the the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

SEC source: 0001213900-20-036459 · ownership.xml · derivative · entry 1

Revers Daniel R · CIK 0001405456 · Director · Chairman · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By ArcLight CTC Holdings, L.P.

Disclosed balance after: 6,797,500

Underlying: Class A ordinary shares · 250,000 shares

Expires not disclosed

F1 · derivative.exercise_price: This Form 4 reflects the surrender to the issuer of 250,000 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333- 248625).

F1 · kind: This Form 4 reflects the surrender to the issuer of 250,000 of the issuer's Class B ordinary shares, par value $0.0001 per share, for no consideration by ArcLight CTC Holdings, L.P.'s ("Sponsor") as a result of the Sponsor's participation in the issuer's initial public offering, as more fully described in the issuer's registration statement on Form S-1 (File No. 333- 248625).

F2 · price: As described in the issuer's registration statement on Form S-1 (File No. 333-248625) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.exercise_date: As described in the issuer's registration statement on Form S-1 (File No. 333-248625) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F2 · derivative.expiration_date: As described in the issuer's registration statement on Form S-1 (File No. 333-248625) under the heading "Description of Securities -- Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date.

F3 · ownership.direct: The securities reported herein are held directly by the Sponsor. The reporting person has voting and investment discretion with respect to the securities held by the the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

SEC source: 0000899243-19-020240 · doc4.xml · nonDerivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · shares: Represents common units representing limited partnership interests (the "Common Units") of Third Coast Midstream, LLC (f/k/a American Midstream Partners, LP), a Delaware limited liability company (the "Issuer").

F2 · balance_after: Pursuant to that certain Master Contribution Agreement, dated July 22, 2019, by and among Anchor Midstream Acquisition, LLC, a Delaware limited liability company ("Anchor Acquisition"), 3CM Holdings, LLC (f/k/a High Point Infrastructure Partners, LLC), a Delaware limited liability company ("3CM"), Third Coast Midstream Holdings, LLC (f/k/a/ American Midstream GP, LLC), a Delaware limited liability company (the "General Partner"), Magnolia Infrastructure Holdings, LLC, a Delaware limited liability company ("Magnolia Holdings"), Magnolia Infrastructure Partners, LLC, a Delaware limited liability company ("Magnolia"), AMID GP Holdings, LLC, a Delaware limited liability company ("AMID GP"), JP Energy Development, L.P., a Delaware limited partnership ("JP Energy"), Busbar II, LLC, a Delaware limited liability company ("Busbar"), High Point Energy, LLC, a Texas limited liability company, ArcLight Energy Partners Fund V, L.P.,

F3 · balance_after: (continued from footnote 2) a Delaware limited partnership ("Fund V"), Stephen W. Bergstrom, individually ("Bergstrom") and Daniel C. Campbell, individually, (i) JP Energy, as holder of 422,805 Common Units, transferred all of its Common Units to Magnolia Holdings, (ii) Magnolia Holdings, as holder of 20,372,720 Common Units, transferred all of its Common Units to the General Partner, (iii) Magnolia, as holder of 5,108,669 Common Units, transferred all of its Common Units to the General Partner, (iv) Busbar, as holder of 2,853,482 Common Units, transferred all of its Common Units to the General Partner and (v) Bergstrom, as holder of 64,221 Common Units, transferred all of his Common Units to the General Partner. Immediately following the preceding transactions, the General Partner, as holder of 41,209,117 Common Units, transferred all of its Common Units to Anchor Acquisition.

F4 · balance_after: On July 23, 2019, pursuant to a Plan of Conversion adopted by the Issuer, the Issuer converted into a Delaware limited liability company named "Third Coast Midstream, LLC" ("Third Coast Midstream" and, such conversion, the "AMID Conversion"). In connection with the AMID Conversion, each Common Unit issued and outstanding immediately prior to the AMID Conversion was converted into one limited liability company unit of Third Coast Midstream. Magnolia Holdings also beneficially owns 1,369,230 Common Units issuable upon exercise of the warrants issued to Magnolia Holdings by the Issuer, dated July 18, 2019. After the AMID Conversion, all of the outstanding warrants converted into the right to receive 1,369,230 limited liability company units of Third Coast Midstream. As a result of the AMID Conversion, all Common Units were cancelled and ceased to be outstanding and none of JP Energy, Magnolia Holdings, Magnolia and Busbar beneficially own any Common Units.

F1 · ownership.nature: Represents common units representing limited partnership interests (the "Common Units") of Third Coast Midstream, LLC (f/k/a American Midstream Partners, LP), a Delaware limited liability company (the "Issuer").

SEC source: 0001513965-19-000065 · wf-form4_155795533660415.xml · derivative · entry 3

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (3)

Disclosed balance after: 9,808,777

Underlying: Common Units (limited partner interests) · 281,127 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0014 at any time.

F3 · derivative.exercise_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0014 at any time.

F3 · derivative.expiration_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0014 at any time.

SEC source: 0001513965-19-000065 · wf-form4_155795533660415.xml · derivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (2)

Disclosed balance after: 4,489,748

Underlying: Common Units (limited partner interests) · 131,606 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.2811 at any time.

F2 · derivative.exercise_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.2811 at any time.

F2 · derivative.expiration_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.2811 at any time.

SEC source: 0001513965-19-000065 · wf-form4_155795533660415.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (1)

Disclosed balance after: 10,479,528

Underlying: Common Units (limited partner interests) · 239,779 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by American Midstream GP, LLC (the "General Partner"), the general partner of American Midstream Partners, LP (the "Issuer") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of the Issuer ("Common Units") at a conversion ratio of 1:1.2811 at any time.

F1 · derivative.exercise_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by American Midstream GP, LLC (the "General Partner"), the general partner of American Midstream Partners, LP (the "Issuer") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of the Issuer ("Common Units") at a conversion ratio of 1:1.2811 at any time.

F1 · derivative.expiration_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by American Midstream GP, LLC (the "General Partner"), the general partner of American Midstream Partners, LP (the "Issuer") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of the Issuer ("Common Units") at a conversion ratio of 1:1.2811 at any time.

SEC source: 0000899243-19-004047 · doc4.xml · derivative · entry 3

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 9,514,330

Underlying: Common Units (limited partner interests) · 273,069 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0014 at any time.

F3 · derivative.exercise_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0014 at any time.

F3 · derivative.expiration_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0014 at any time.

F3 · ownership.nature: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0014 at any time.

SEC source: 0000899243-19-004047 · doc4.xml · derivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,401,875

Underlying: Common Units (limited partner interests) · 127,747 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.2811 at any time.

F2 · derivative.exercise_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.2811 at any time.

F2 · derivative.expiration_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.2811 at any time.

F2 · ownership.nature: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.2811 at any time.

SEC source: 0000899243-19-004047 · doc4.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 7,940,322

Underlying: Common Units (limited partner interests) · 281,861 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.2811 at any time.

F1 · derivative.exercise_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.2811 at any time.

F1 · derivative.expiration_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.2811 at any time.

F1 · ownership.nature: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.2811 at any time.

SEC source: 0001628280-18-015021 · wf-form4_154457089559054.xml · nonDerivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote 3

Disclosed balance after: 15,385,954

F1 · price: In December 2013, American Midstream Partners, LP (the "Issuer") acquired Blackwater Midstream Holdings, LLC ("Blackwater") from AL Blackwater, LLC ("AL Blackwater"). The Agreement and Plan of Merger by and among AL Blackwater, Blackwater, the Issuer and Blackwater Merger Sub, LLC, dated as of December 10, 2013 (the "Merger Agreement"), included a provision whereby AL Blackwater would be entitled to additional merger consideration, payable in either cash or Common Units, or a combination thereof, based on Blackwater meeting certain operating targets. Final resolution of the additional merger consideration was determined in the fourth quarter of 2018, in accordance with the Merger Agreement, and, on December 10, 2018, the Issuer issued 810,517 Common Units to Common Units to Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings"), an affiliate of AL Blackwater, as part of the additional merger consideration.

F2 · balance_after: Does not include (i) 7,707,571 Series A-1 Convertible Preferred Units held directly by High Point Infrastructure Partners, LLC ("HPIP"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.2811 at any time, (ii) 3,302,158 Series A-2 Convertible Preferred Units held by Magnolia Infrastructure Partners, LLC ("Magnolia"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.2811 at any time and (iii) 9,241,642 Series C Convertible Preferred Units held by Magnolia Holdings, which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.0014 at any time.

F3 · ownership.direct: The common units reflected in Column 5 include (i) 2,853,482 common units directly owned by Busbar II, LLC ("Busbar"), (ii) 10,563,942 common units directly owned by Magnolia Holdings, (iii) 618,921 common units directly owned by Magnolia, (iv) 1,349,609 common units directly owned by American Midstream GP, LLC (the "General Partner"), the general partner of the Issuer.

SEC source: 0001513965-18-000098 · wf-form4_153455267337808.xml · nonDerivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (4)

Disclosed balance after: 14,575,437

F2 · balance_after: Does not include (i) 7,707,571 Series A-1 Convertible Preferred Units held directly by High Point Infrastructure Partners, LLC ("HPIP"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.1582 at any time, (ii) 3,302,158 Series A-2 Convertible Preferred Units held by Magnolia Infrastructure Partners, LLC ("Magnolia"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.1582 at any time and (iii) 9,241,642 Series C Convertible Preferred Units held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.0542 at any time.

F4 · ownership.nature: The common units reflected in Column 5 include (i) 2,853,482 common units directly owned by Busbar, (ii) 9,753,425 common units directly owned by Magnolia Holdings, (iii) 618,921 common units directly owned by Magnolia and (iv) 1,349,609 common units directly owned by the General Partner.

SEC source: 0001513965-18-000098 · wf-form4_153455267337808.xml · nonDerivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (3)

Disclosed balance after: 14,572,937

F1 · price: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transaction ranging from $5.80 to $6.50, inclusive. The Reporting Persons undertake to provide to American Midstream Partners, LP (the "Issuer"), any security holder of the Issuer or the staff of the United States Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth above.

F2 · balance_after: Does not include (i) 7,707,571 Series A-1 Convertible Preferred Units held directly by High Point Infrastructure Partners, LLC ("HPIP"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.1582 at any time, (ii) 3,302,158 Series A-2 Convertible Preferred Units held by Magnolia Infrastructure Partners, LLC ("Magnolia"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.1582 at any time and (iii) 9,241,642 Series C Convertible Preferred Units held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings"), which have no expiration date and are convertible in whole or in part into common units of the Issuer at a conversion rate of 1:1.0542 at any time.

F3 · ownership.nature: The common units reflected in Column 5 include (i) 2,850,982 common units directly owned by Busbar II, LLC ("Busbar"), (ii) 9,753,425 common units directly owned by Magnolia Holdings, (iii) 618,921 common units directly owned by Magnolia and (iv) 1,349,609 common units directly owned by American Midstream GP, LLC (the "General Partner"), the general partner of the Issuer.

SEC source: 0001513965-18-000016 · wf-form4_151881865842671.xml · derivative · entry 3

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (3)

Disclosed balance after: 9,241,642

Underlying: Common Units (limited partner interests) · 288,789 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0456 at any time.

F3 · derivative.exercise_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0456 at any time.

F3 · derivative.expiration_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record date. The Series C Units have no expiration date and are convertible in whole or part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.0456 at any time.

SEC source: 0001513965-18-000016 · wf-form4_151881865842671.xml · derivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (2)

Disclosed balance after: 3,302,158

Underlying: Common Units (limited partner interests) · 100,054 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.1490 at any time.

F2 · derivative.exercise_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.1490 at any time.

F2 · derivative.expiration_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units') at a conversion ratio of 1:1.1490 at any time.

SEC source: 0001513965-18-000016 · wf-form4_151881865842671.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (1)

Disclosed balance after: 7,707,571

Underlying: Common Units (limited partner interests) · 233,537 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.1490 at any time.

F1 · derivative.exercise_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.1490 at any time.

F1 · derivative.expiration_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion rate of 1:1.1490 at any time.

SEC source: 0001513965-17-000145 · wf-form4_151087281863774.xml · derivative · entry 3

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (3)

Disclosed balance after: 8,965,447

Underlying: Common Units (limited partner interests) · 181,003 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record dated. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0448 at any time.

F3 · kind: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record dated. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0448 at any time.

F3 · derivative.exercise_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record dated. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0448 at any time.

F3 · derivative.expiration_date: Represents Series C Convertible Preferred Units (the "Series C Units") held by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series C Units owned on the distribution record dated. The Series C Units have no expiration date and are convertible in whole or part into Common Units at a conversion ratio of 1:1.0448 at any time.

SEC source: 0001513965-17-000145 · wf-form4_151087281863774.xml · derivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (2)

Disclosed balance after: 3,215,079

Underlying: Common Units (limited partner interests) · 62,849 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1483 at any time.

F2 · kind: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1483 at any time.

F2 · derivative.exercise_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1483 at any time.

F2 · derivative.expiration_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1483 at any time.

SEC source: 0001513965-17-000145 · wf-form4_151087281863774.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (1)

Disclosed balance after: 7,504,319

Underlying: Common Units (limited partner interests) · 146,696 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1483 at any time.

F1 · kind: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1483 at any time.

F1 · derivative.exercise_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1483 at any time.

F1 · derivative.expiration_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units) held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1483 at any time.

SEC source: 0001513965-17-000127 · wf-form4_150715847774986.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Units (limited partner interests) · 2,333,333 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Agreement of Limited Partnership of the Issuer (as amended, the "Partnership Agreement"), the Issuer exercised its call right to repurchase all of the 2,333,333 outstanding Series D Convertible Preferred Units (the "Series D Units") from Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings). On October 2, 2017, the Issuer purchased the Series D Units from Magnolia Holdings in a transaction in accordance with the Partnership Agreement and Rule 16b-3. As a result, none remain outstanding.

F1 · derivative.exercise_date: Pursuant to the Agreement of Limited Partnership of the Issuer (as amended, the "Partnership Agreement"), the Issuer exercised its call right to repurchase all of the 2,333,333 outstanding Series D Convertible Preferred Units (the "Series D Units") from Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings). On October 2, 2017, the Issuer purchased the Series D Units from Magnolia Holdings in a transaction in accordance with the Partnership Agreement and Rule 16b-3. As a result, none remain outstanding.

F1 · derivative.expiration_date: Pursuant to the Agreement of Limited Partnership of the Issuer (as amended, the "Partnership Agreement"), the Issuer exercised its call right to repurchase all of the 2,333,333 outstanding Series D Convertible Preferred Units (the "Series D Units") from Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings). On October 2, 2017, the Issuer purchased the Series D Units from Magnolia Holdings in a transaction in accordance with the Partnership Agreement and Rule 16b-3. As a result, none remain outstanding.

F2 · ownership.nature: Held directly by Magnolia Holdings.

SEC source: 0001513965-17-000117 · wf-form4_150293517189864.xml · derivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (3)

Disclosed balance after: 3,160,347

Underlying: Common Units (limited partner interests) · 45,733 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F3 · kind: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F3 · derivative.exercise_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F3 · derivative.expiration_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F4 · balance_after: Represents the aggregate number of Series A-2 Units held after the acquisition of Series A-2 Units reported in Column 5 of this line item.

SEC source: 0001513965-17-000117 · wf-form4_150293517189864.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (1)

Disclosed balance after: 7,376,568

Underlying: Common Units (limited partner interests) · 106,745 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F1 · kind: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F1 · derivative.exercise_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F1 · derivative.expiration_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F2 · balance_after: Represents the aggregate number of Series A-1 Units held after the acquisition of Series A-1 Units reported in Column 5 of this line item.

SEC source: 0001513965-17-000119 · wf-form4a_150343329349954.xml · derivative · entry 2

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (3)

Disclosed balance after: 3,160,347

Underlying: Common Units (limited partner interests) · 45,733 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F3 · kind: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F3 · derivative.exercise_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F3 · derivative.expiration_date: Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.1154 at any time.

F4 · balance_after: Represents the aggregate number of Series A-2 Units held after the acquisition of Series A-2 Units reported in Column 5 of this line item.

SEC source: 0001513965-17-000119 · wf-form4a_150343329349954.xml · derivative · entry 1

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · Director · 10% owner · SEE REMARKS

Magnolia Infrastructure Holdings, LLC · CIK 0001673060 · Director · 10% owner

Magnolia Infrastructure Partners, LLC · CIK 0001638285 · Director · 10% owner

High Point Infrastructure Partners, LLC · CIK 0001575227 · Director · 10% owner · See Remarks

AMID GP Holdings, LLC · CIK 0001715051 · Director · 10% owner

American Midstream GP, LLC · CIK 0001526603 · Director · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · Director · 10% owner

ArcLight Capital Partners, LLC · CIK 0001502945 · Director · 10% owner

Revers Daniel R · CIK 0001405456 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · (1)

Disclosed balance after: 7,376,568

Underlying: Common Units (limited partner interests) · 106,745 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F1 · kind: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F1 · derivative.exercise_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F1 · derivative.expiration_date: Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of American Midstream Partners, LP (the "Issuer") ("Common Units") at a conversion ratio of 1:1.1154 at any time.

F2 · balance_after: Represents the aggregate number of Series A-1 Units held after the acquisition of Series A-1 Units reported in Column 5 of this line item.

SEC source: 0001068238-17-000196 · form4.xml · nonDerivative · entry 1

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,238,773

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

SEC source: 0001068238-17-000187 · form4.xml · nonDerivative · entry 2

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,242,773

F4 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.00 to $16.05, inclusive.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

SEC source: 0001068238-17-000187 · form4.xml · nonDerivative · entry 1

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,263,299

F3 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.00 to $16.02, inclusive. The reporting person undertakes to provide to Enable Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units sold at each separate price within the ranges set forth in footnotes (3) and (4) to this Form 4.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

SEC source: 0001068238-17-000185 · form4.xml · nonDerivative · entry 2

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,263,464

F4 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.00 to $16.03, inclusive.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex.

SEC source: 0001068238-17-000185 · form4.xml · nonDerivative · entry 1

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,267,343

F3 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.00 to $16.05, inclusive. The reporting person undertakes to provide to Enable Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units sold at each separate price within the ranges set forth in footnotes (3) and (4) to this Form 4.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex.

SEC source: 0001068238-17-000164 · form4.xml · nonDerivative · entry 2

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,268,374

F4 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.00 to $16.10, inclusive.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

SEC source: 0001068238-17-000164 · form4.xml · nonDerivative · entry 1

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,271,075

F3 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.00 to $16.10, inclusive. The reporting person undertakes to provide to Enable Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units sold at each separate price within the ranges set forth in footnotes (3) and (4) to this Form 4.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

SEC source: 0001068238-17-000162 · form4.xml · nonDerivative · entry 2

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,279,364

F4 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.10 to $16.35, inclusive.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

SEC source: 0001068238-17-000162 · form4.xml · nonDerivative · entry 1

ArcLight Capital Partners, LLC · CIK 0001502945 · 10% owner

ArcLight Capital Holdings, LLC · CIK 0001441290 · 10% owner

Bronco Midstream Infrastructure, LLC · CIK 0001605222 · 10% owner

Enogex Holdings LLC · CIK 0001605216 · 10% owner

ArcLight Energy Partners Fund IV LP · CIK 0001399007 · 10% owner

ARCLIGHT ENERGY PARTNERS FUND V, L.P. · CIK 0001502553 · 10% owner

Bronco Midstream Partners, L.P. · CIK 0001605221 · 10% owner

Revers Daniel R · CIK 0001405456 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 43,291,469

F3 · price: The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $16.15 to $16.43, inclusive. The reporting person undertakes to provide to Enable Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units sold at each separate price within the ranges set forth in footnotes (3) and (4) to this Form 4.

F1 · ownership.direct: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.direct: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.

F1 · ownership.nature: This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.

F2 · ownership.nature: The Common Units are held directly by Bronco Infrastructure. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex Holdings.