HTO

SEC source: 0002079031-26-000003 · wk-form4_1785798417.xml · nonDerivative · entry 1

Mattern Megan · CIK 0002079031 · CAO, PAO and Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,631

F1 · shares: Represents 1,154 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on July 30, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated July 30, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F2 · balance_after: Represents 3,052 shares of Common Stock and 10,579 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001924953-26-000007 · primary_doc.xml · nonDerivative · entry 1

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,615,265

SEC source: 0001924953-26-000008 · primary_doc.xml · nonDerivative · entry 1

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,615,265

SEC source: 0001924953-26-000006 · primary_doc.xml · nonDerivative · entry 2

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,612,481

SEC source: 0001924953-26-000006 · primary_doc.xml · nonDerivative · entry 1

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,610,349

SEC source: 0001598003-26-000009 · wk-form4_1783372199.xml · nonDerivative · entry 1

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,461

F1 · shares: Represents 374 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on July 1, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated July 1, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F2 · balance_after: Represents 15,235 shares of Common Stock and 11,226 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001735307-26-000005 · wk-form4_1783365228.xml · nonDerivative · entry 1

Kelly Ann P · CIK 0001735307 · CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,976

F1 · shares: Represents 88 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on July 1, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated July 1, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F2 · balance_after: Represents 2,176 shares of Common Stock and 7,800 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001598003-26-000006 · wk-form4_1780707097.xml · nonDerivative · entry 1

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,835

F1 · balance_after: Represents 14,416 shares of Common Stock and 12,419 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001313291-26-000004 · wk-form4_1780520535.xml · derivative · entry 2

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,160

Underlying: Common Stock · 139 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents 139 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · shares: Represents 139 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · price: Represents 139 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · derivative.exercise_date: Represents 139 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · derivative.expiration_date: Represents 139 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

SEC source: 0001924953-26-000005 · primary_doc.xml · nonDerivative · entry 2

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,612,035

SEC source: 0001924953-26-000005 · primary_doc.xml · nonDerivative · entry 1

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,581,034

SEC source: 0000766829-26-000019 · wk-form4_1778885580.xml · nonDerivative · entry 1

KRUGER DENISE L · CIK 0001184069 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,923

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan. Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 4,976 shares of Common Stock and 1,947 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-035686 · wk-form4_1778877928.xml · nonDerivative · entry 1

KLEIN REBECCA A · CIK 0001488085 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,208

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan. Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 7,261 shares of Common Stock and 1,947 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001812484-26-000003 · wk-form4_1778877753.xml · nonDerivative · entry 1

Guardino Carl · CIK 0001812484 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,139

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan ("LTIP"). Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances. The reporting person has elected to defer receipt of the RSUs pursuant to the terms of the Formulaic Equity Award Program for Non-Employee Board Members implemented under the LTIP.

F2 · balance_after: Represents 7,192 shares of Common Stock and 1,947 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001371472-26-000002 · wk-form4_1778877665.xml · nonDerivative · entry 1

Heather Hunt · CIK 0001371472 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,238

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan. Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 9,291 shares of Common Stock and 1,947 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001218375-26-000002 · wk-form4_1778877570.xml · nonDerivative · entry 1

HANLEY MARY ANN · CIK 0001218375 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,583

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan ("LTIP"). Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances. The reporting person has elected to defer receipt of the RSUs pursuant to the terms of the Formulaic Equity Award Program for Non-Employee Board Members implemented under the LTIP.

F2 · balance_after: Represents 9,636 shares of Common Stock and 1,947 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001218382-26-000003 · wk-form4_1778876839.xml · nonDerivative · entry 1

WALLACE CAROL P · CIK 0001218382 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,238

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan. Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 9,291 shares of Common Stock and 1,947 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001451547-26-000006 · wk-form4_1778876471.xml · nonDerivative · entry 1

Rowe Nick Orlando · CIK 0001451547 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,452

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan. Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 2,452 shares of the issuer's Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001639398-26-000005 · wk-form4_1778876363.xml · nonDerivative · entry 1

More Daniel B. · CIK 0001639398 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,947

F1 · shares: Represents 1,947 restricted stock units ("RSUs") granted to the reporting person under the Issuer's Long-Term Incentive Plan. Each RSU will entitle the reporting person to receive one share of the Issuer's common stock ("Common Stock") when that unit vests. The RSUs will vest in full upon the reporting person's continuation in Board service through the day immediately preceding the date of the Issuer's 2027 annual stockholders meeting, subject to accelerated vesting under certain prescribed circumstances.

SEC source: 0001214659-26-004574 · marketforms-72936.xml · nonDerivative · entry 1

ATLAS Infrastructure Partners (UK) Ltd. · CIK 0001924953 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,582,469

SEC source: 0002131211-26-000002 · primary_doc.xml · nonDerivative · entry 1

GIP ATLAS Holdings Ltd · CIK 0002131211 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,582,469

SEC source: 0001628280-26-014250 · wk-form4_1772583098.xml · derivative · entry 4

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,021

Underlying: Common Stock · 145 shares

Expires not disclosed

F5 · derivative.exercise_price: Represents 145 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F5 · shares: Represents 145 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F5 · price: Represents 145 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F5 · derivative.exercise_date: Represents 145 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F5 · derivative.expiration_date: Represents 145 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

SEC source: 0001628280-26-014096 · wk-form4_1772578035.xml · nonDerivative · entry 1

Rowe Nick Orlando · CIK 0001451547 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 505

F1 · shares: Represents 505 restricted stock units granted to the reporting person under the Issuer's 2023 Long-Term Incentive Plan. Each restricted stock unit will entitle the reporting person to receive one share of the Issuer's common stock when that unit vests. The units will vest in full on the one year anniversary of the date of grant, subject to accelerated vesting under certain prescribed circumstances.

SEC source: 0001628280-26-014329 · wk-form4_1772588605.xml · nonDerivative · entry 3

Brown Willie D. Jr. · CIK 0001866152 · VP & Gen Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,554

F3 · shares: Represents (i) 426 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 ROE RSUs reported on this Form 4 and (ii) 95 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 TSR RSUs reported on this Form 4.

F4 · balance_after: Represents 10,005 shares of Common Stock and 3,549 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-014329 · wk-form4_1772588605.xml · nonDerivative · entry 2

Brown Willie D. Jr. · CIK 0001866152 · VP & Gen Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,075

F2 · shares: Represents (i) 1,034 shares of Issuer's Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on average return on equity ("ROE") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025 and (ii) 229 shares of Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on relative total shareholder return ("TSR") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025.

SEC source: 0001628280-26-014329 · wk-form4_1772588605.xml · nonDerivative · entry 1

Brown Willie D. Jr. · CIK 0001866152 · VP & Gen Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,812

F1 · shares: Represents 1,384 shares of the issuer's common stock ("Common Stock") underlying restricted stock units ("RSUs") granted to the reporting person under the issuer's Long-Term Incentive Plan. Each RSU entitles the reporting person to receive one share of Common Stock upon vesting of the RSU. The RSUs will vest in three annual successive installments upon the completion of the reporting person's each year of service with the issuer for the three-year period measured from the date of grant, subject to accelerated vesting under certain prescribed circumstances.

SEC source: 0001628280-26-014252 · wk-form4_1772583127.xml · nonDerivative · entry 1

Mattern Megan · CIK 0002079031 · CAO, PAO and Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,785

F1 · shares: Represents 2,166 shares of the issuer's common stock ("Common Stock") underlying restricted stock units ("RSUs") granted to the reporting person under the issuer's Long-Term Incentive Plan. Each RSU entitles the reporting person to receive one share of Common Stock upon vesting of the RSU. The RSUs will vest in three annual successive installments upon the completion of the reporting person's each year of service with the issuer for the three-year period measured from the date of grant, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 14,785 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-014250 · wk-form4_1772583098.xml · nonDerivative · entry 3

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,565

F3 · shares: Represents (i) 385 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 ROE RSUs reported on this Form 4 and (ii) 85 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 TSR RSUs reported on this Form 4.

F4 · balance_after: Represents 7,777 shares of Common Stock and 6,788 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-014250 · wk-form4_1772583098.xml · nonDerivative · entry 2

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,035

F2 · shares: Represents (i) 1,034 shares of Issuer's Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on average return on equity ("ROE") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025 and (ii) 229 shares of Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on relative total shareholder return ("TSR") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025.

SEC source: 0001628280-26-014250 · wk-form4_1772583098.xml · nonDerivative · entry 1

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,772

F1 · shares: Represents 1,312 shares of the issuer's common stock ("Common Stock") underlying restricted stock units ("RSUs") granted to the reporting person under the issuer's Long-Term Incentive Plan. Each RSU entitles the reporting person to receive one share of Common Stock upon vesting of the RSU. The RSUs will vest in three annual successive installments upon the completion of the reporting person's each year of service with the issuer for the three-year period measured from the date of grant, subject to accelerated vesting under certain prescribed circumstances.

SEC source: 0001628280-26-014208 · wk-form4_1772581147.xml · nonDerivative · entry 3

Hauk Bruce A · CIK 0001805479 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,616

F3 · shares: Represents (i) 311 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 ROE RSUs reported on this Form 4 and (ii) 67 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 TSR RSUs reported on this Form 4.

F4 · balance_after: Represents 7,600 shares of Common Stock and 9,016 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-014208 · wk-form4_1772581147.xml · nonDerivative · entry 2

Hauk Bruce A · CIK 0001805479 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,994

F2 · shares: Represents (i) 1,230 shares of Issuer's Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on average return on equity ("ROE") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025 and (ii) 273 shares of Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on relative total shareholder return ("TSR") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025.

SEC source: 0001628280-26-014208 · wk-form4_1772581147.xml · nonDerivative · entry 1

Hauk Bruce A · CIK 0001805479 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,491

F1 · shares: Represents 2,743 shares of the issuer's common stock ("Common Stock") underlying restricted stock units ("RSUs") granted to the reporting person under the issuer's Long-Term Incentive Plan. Each RSU entitles the reporting person to receive one share of Common Stock upon vesting of the RSU. The RSUs will vest in three annual successive installments upon the completion of the reporting person's each year of service with the issuer for the three-year period measured from the date of grant, subject to accelerated vesting under certain prescribed circumstances.

SEC source: 0001628280-26-014207 · wk-form4_1772581102.xml · nonDerivative · entry 1

Kelly Ann P · CIK 0001735307 · CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,064

F1 · shares: Represents 1,707 shares of the issuer's common stock ("Common Stock") underlying restricted stock units ("RSUs") granted to the reporting person under the issuer's Long-Term Incentive Plan. Each RSU entitles the reporting person to receive one share of Common Stock upon vesting of the RSU. The RSUs will vest in three annual successive installments upon the completion of the reporting person's each year of service with the issuer for the three-year period measured from the date of grant, subject to accelerated vesting under certain prescribed circumstances.

F2 · balance_after: Represents 1,947 shares of Common Stock and 8,117 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-014206 · wk-form4_1772581049.xml · nonDerivative · entry 3

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,343

F3 · shares: Represents (i) 507 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 ROE RSUs reported on this Form 4 and (ii) 98 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on shares of Common Stock that became issuable pursuant to the vesting of the 2023 TSR RSUs reported on this Form 4.

F4 · balance_after: Represents 16,220 shares of Common Stock and 14,123 shares of the Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-014206 · wk-form4_1772581049.xml · nonDerivative · entry 2

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,948

F2 · shares: Represents (i) 1,395 shares of Issuer's Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on average return on equity ("ROE") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025 and (ii) 309 shares of Common Stock subject to the 2023 RSUs that vested upon the attainment of a certain performance goal based on relative total shareholder return ("TSR") measured over a period from January 1, 2023 to December 31, 2025 and continued service by the reporting person through December 31, 2025.

SEC source: 0001628280-26-014206 · wk-form4_1772581049.xml · nonDerivative · entry 1

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,244

F1 · shares: Represents 5,950 shares of the issuer's common stock ("Common Stock") underlying restricted stock units ("RSUs") granted to the reporting person under the issuer's Long-Term Incentive Plan. Each RSU entitles the reporting person to receive one share of Common Stock upon vesting of the RSU. The RSUs will vest in three annual successive installments upon the completion of the reporting person's each year of service with the issuer for the three-year period measured from the date of grant, subject to accelerated vesting under certain prescribed circumstances.

SEC source: 0001628280-26-001079 · wk-form4_1767752364.xml · nonDerivative · entry 2

Brown Willie D. Jr. · CIK 0001866152 · VP & Gen Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,428

F2 · shares: Represents 178 shares of the issuer's Common Stock withheld in satisfaction of the applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 3, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated January 3, 2023. The shares underlying such RSUs were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F3 · balance_after: Represents 9,263 shares of Common Stock and 2,165 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-001064 · wk-form4_1767750560.xml · nonDerivative · entry 2

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,294

F2 · shares: Represents 216 shares of the issuer's Common Stock withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 3, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated January 3, 2023. The shares underlying such RSUs were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F3 · balance_after: Represents 16,825 shares of Common Stock and 6,469 shares of the Common Stock underlying restricted stock units which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-001051 · wk-form4_1767749094.xml · nonDerivative · entry 2

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,460

F2 · shares: Represents 160 shares of the issuer's Common Stock withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 3, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated January 3, 2023. The shares underlying such RSUs were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F3 · balance_after: Represents 8,247 shares of the issuer's Common Stock and 4,213 shares of Common Stock underlying restricted stock units which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-001046 · wk-form4_1767748881.xml · nonDerivative · entry 2

Hauk Bruce A · CIK 0001805479 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,748

F2 · shares: Represents 152 shares of the issuer's Common Stock withheld in satisfaction of the applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 3, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated January 3, 2023. The shares underlying such RSUs were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F3 · balance_after: Represents 7,978 shares of Common Stock and 4,770 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-001079 · wk-form4_1767752364.xml · nonDerivative · entry 1

Brown Willie D. Jr. · CIK 0001866152 · VP & Gen Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,606

F1 · shares: Represents 565 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 2, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreements between the reporting person and the issuer dated January 2, 2024 and January 2, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

SEC source: 0001628280-26-001078 · wk-form4_1767751938.xml · nonDerivative · entry 1

Kelly Ann P · CIK 0001735307 · CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,357

F1 · shares: Represents 200 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 2, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreement between the reporting person and the issuer dated January 2, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

F2 · balance_after: Represents 1,947 shares of Common Stock and 6,410 shares of Common Stock underlying RSUs which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-26-001064 · wk-form4_1767750560.xml · nonDerivative · entry 1

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,510

F1 · shares: Represents 682 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 2, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreements between the reporting person and the issuer dated January 2, 2024 and January 2, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

SEC source: 0001628280-26-001051 · wk-form4_1767749094.xml · nonDerivative · entry 1

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,620

F1 · shares: Represents 514 shares of the issuer's common stock (Common Stock) withheld in satisfaction of applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 2, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreements between the reporting person and the issuer dated January 2, 2024 and January 2, 2025. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

SEC source: 0001628280-26-001046 · wk-form4_1767748881.xml · nonDerivative · entry 1

Hauk Bruce A · CIK 0001805479 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,900

F1 · shares: Represents 873 shares of the issuer's common stock (Common Stock) withheld in satisfaction of the applicable withholding taxes upon the vesting of certain shares of Common Stock that became issuable on January 2, 2026 pursuant to the terms of the Restricted Stock Unit Issuance Agreements between the reporting person and the issuer dated December 20, 2022, January 2, 2024, and January 2, 2025, respectively. The shares underlying such restricted stock units (RSUs) were previously reported as Table I securities at the time the RSUs were granted. Accordingly, the issuance of such shares is not a reportable transaction on this Form 4.

SEC source: 0001628280-25-055137 · wk-form4_1764801672.xml · nonDerivative · entry 1

Kelly Ann P · CIK 0001735307 · CFO and Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,557

F1 · shares: Represents 581 shares of Common Stock withheld in satisfaction of the applicable withholding taxes on certain shares of Common Stock that became issuable on December 1, 2025.

F2 · balance_after: Represents 1,536 shares of Issuers common stock (Common Stock) and 7,021 shares of Common Stock underlying restricted stock units which will vest and become issuable in accordance with their terms.

SEC source: 0001628280-25-055124 · wk-form4_1764800594.xml · derivative · entry 2

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,876

Underlying: Common Stock · 159 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents 159 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · shares: Represents 159 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · derivative.exercise_date: Represents 159 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · derivative.expiration_date: Represents 159 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

SEC source: 0001628280-25-052367 · wk-form4_1763154898.xml · nonDerivative · entry 1

Walters Andrew F · CIK 0001598003 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,192

F1 · price: The price reported in Column 4 is a weighted average price. These shares of common stock of H2O America ("Common Stock") were sold in multiple transactions at prices ranging from $47.17 to $47.29, inclusive.

F2 · balance_after: Represents 15,310 shares of Common Stock and 8,882 shares of the Common Stock underlying restricted stock units which will vest and become issuable in accordance with their terms.

SEC source: 0001313291-25-000010 · wk-form4_1757023091.xml · derivative · entry 2

Johnson A Kristen · CIK 0001313291 · Chief Administrative Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,717

Underlying: Common Stock · 151 shares

Expires not disclosed

F2 · derivative.exercise_price: Represents 151 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · shares: Represents 151 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · derivative.exercise_date: Represents 151 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.

F2 · derivative.expiration_date: Represents 151 shares subject to deferred stock units ("DSUs") granted to the reporting person pursuant to dividend equivalent rights ("DERs") accrued on outstanding DSUs granted by Connecticut Water Service, Inc., a wholly owned subsidiary of the Issuer. DERs accrue when and as dividends are paid on the Common Stock underlying the awards and will vest and be settled in accordance with the same terms as the DSUs to which they relate.