NWN

SEC source: 0001733998-26-000147 · form4.xml · nonDerivative · entry 1

Patterson Kyra · CIK 0002085542 · VP and Chief People Officer · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,219

F1 · shares: Shares were withheld by Issuer to cover withholding taxes on issuance of shares due to vesting of time-based restricted stock units on October 1, 2026.

F2 · balance_after: Includes 1,642 time-based restricted stock units granted under Issuers Long Term Incentive Plan. The restricted stock units vest in two equal installments on October 1, 2027 and October 1, 2028.

SEC source: 0001733998-26-000143 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 49,259

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on March 27, 2026. As previously disclosed, Mr. Anderson retired from his position as CEO of NW Holdings and NW Natural, effective April 1, 2025. At the time the 10b5-1 Plan was established, Mr. Anderson held more than 7 times the then-current $450,000 stock ownership requirements for non-management directors. This trading arrangement allows Mr. Anderson to periodically sell a portion of his NW Holdings common stock to diversify his holdings in connection with his retirement.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $47.9550 to $48.2100, resulting in a weighted average price of $48.0259. Northwest Natural Holding Company (Issuer) will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares sold at each separate price.

SEC source: 0001733998-26-000141 · form4.xml · nonDerivative · entry 1

Kaszuba Raymond J III · CIK 0001649589 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,234

F1 · shares: Shares were withheld by Issuer to cover withholding taxes on issuance of shares due to vesting of time-based restricted stock units on September 1, 2026.

F2 · balance_after: Includes 2,605 time-based restricted stock units granted under Issuers Long Term Incentive Plan. The restricted stock units vest in one installment on September 1, 2027.

SEC source: 0001733998-26-000139 · form4.xml · nonDerivative · entry 1

WILSON BRODY J · CIK 0001571275 · VP, Treas, Controller & CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,606

F1 · shares: Shares were withheld by Issuer to cover withholding taxes on issuance of shares due to vesting of time-based restricted stock units on September 1, 2026.

F2 · balance_after: Includes 1,086 time-based restricted stock units granted under Issuer's Long Term Incentive Plan. The restricted stock units vest in one installment on September 1, 2027.

SEC source: 0001733998-26-000135 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 50,759

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on March 27, 2026. As previously disclosed, Mr. Anderson retired from his position as CEO of NW Holdings and NW Natural, effective April 1, 2025. At the time the 10b5-1 Plan was established, Mr. Anderson held more than 7 times the $500,000 stock ownership requirements for non-management directors. This trading arrangement allows Mr. Anderson to periodically sell a portion of his NW Holdings common stock to diversify his holdings in connection with his retirement.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $50.5900 to $51.0650, resulting in a weighted average price of $50.8625. Northwest Natural Holding Company (Issuer) will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares sold at each separate price.

SEC source: 0001733998-26-000131 · form4.xml · nonDerivative · entry 1

Bragdon Peter J · CIK 0001297763 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 4,655.233

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about September 22, 2025.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000133 · form4.xml · nonDerivative · entry 1

McDonough Sandra · CIK 0001901349 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 11,216.853

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about January 6, 2022. At the time made, the election was intended to satisfy the then-current Rule 10b5-1. The election has not been entered into, modified or terminated since the original election date.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000129 · form4.xml · nonDerivative · entry 1

Ludford Mary E · CIK 0001959466 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 4,923.61

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about September 13, 2024.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000121 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 52,259

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on March 27, 2026. As previously disclosed, Mr. Anderson retired from his position as CEO of NW Holdings and NW Natural, effective April 1, 2025. At the time the 10b5-1 Plan was established, Mr. Anderson held more than 7 times the $450,000 stock ownership requirements for non-management directors. This trading arrangement allows Mr. Anderson to periodically sell a portion of his NW Holdings common stock to diversify his holdings in connection with his retirement.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $51.01 to $51.46, resulting in a weighted average price of $51.1834. Northwest Natural Holding Company (Issuer) will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares sold at each separate price.

SEC source: 0001733998-26-000119 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 53,759

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on March 27, 2026. As previously disclosed, Mr. Anderson retired from his position as CEO of NW Holdings and NW Natural, effective April 1, 2025. At the time the 10b5-1 Plan was established, Mr. Anderson held more than 7 times the $450,000 stock ownership requirements for non-management directors. This trading arrangement allows Mr. Anderson to periodically sell a portion of his NW Holdings common stock to diversify his holdings in connection with his retirement.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $50.78 to $51.15, resulting in a weighted average price of $50.9006. Northwest Natural Holding Company (Issuer) will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares sold at each separate price.

SEC source: 0001733998-26-000099 · form4.xml · nonDerivative · entry 1

Bragdon Peter J · CIK 0001297763 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 800

SEC source: 0001733998-26-000089 · form4.xml · nonDerivative · entry 1

Palfreyman Justin · CIK 0001686243 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,165

F1 · price: This transaction was executed in multiple trades on the reported date with prices ranging from $48.73 to $48.75 resulting in an average price of $48.75. Northwest Natural Holding Company (Issuer) will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares purchased at each separate transaction.

SEC source: 0001733998-26-000091 · form4.xml · nonDerivative · entry 1

Bragdon Peter J · CIK 0001297763 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 3,490.732

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about September 22, 2025.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000097 · form4.xml · nonDerivative · entry 1

Lee Karen · CIK 0001839510 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 22,710.039

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about June 1, 2021. At the time made, the election was intended to satisfy the then-current Rule 10b5-1. The election has not been entered into, modified or terminated since the original election date.

F2 · ownership.nature: Shares have been credit to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000093 · form4.xml · nonDerivative · entry 1

McDonough Sandra · CIK 0001901349 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 10,861.297

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about January 6, 2022. At the time made, the election was intended to satisfy the then-current Rule 10b5-1. The election has not been entered into, modified or terminated since the original election date.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000095 · form4.xml · nonDerivative · entry 1

Ludford Mary E · CIK 0001959466 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 4,377.282

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about September 13, 2024.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000083 · form4.xml · nonDerivative · entry 1

Weber David A. · CIK 0001538965 · VP, Gas Supply · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149

SEC source: 0001733998-26-000071 · form4.xml · nonDerivative · entry 1

Berge Megan H · CIK 0002058274 · SVP, GC, CCO & Corp. Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,841

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of 1,029 restricted stock units (RSUs) with performance threshold, and vesting of 2,099 time-based RSUs. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026. The 2,099 time-based RSUs are part of 6,297 time-based RSUs that have been reported as shares beneficially owned by the reporting person since initially reported on the reporting persons Form 4 on March 3, 2025.

F2 · balance_after: Includes 4,198 time-based restricted stock units granted under the Long Term Incentive Plan of the Issuer. The restricted stock units vest in two equal installments on each of March 1, 2027 and 2028.

SEC source: 0001733998-26-000052 · form4.xml · nonDerivative · entry 1

Fellon Brian · CIK 0002038828 · VP, CIO & CISO · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,572

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

F2 · balance_after: Includes 1,020 time-based restricted stock units granted under the Long Term Incentive Plan of the Issuer. The restricted stock units vest in two equal installments on each of October 1, 2026 and 2027.

SEC source: 0001733998-26-000063 · form4.xml · nonDerivative · entry 1

Palfreyman Justin · CIK 0001686243 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,940

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000068 · form4.xml · nonDerivative · entry 2

Saathoff MardiLyn · CIK 0001445672 · Chief Legal Officer & SVP, Reg

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,698

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000068 · form4.xml · nonDerivative · entry 1

Saathoff MardiLyn · CIK 0001445672 · Chief Legal Officer & SVP, Reg

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,445

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000056 · form4.xml · nonDerivative · entry 2

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,259

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000056 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,103

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000058 · form4.xml · nonDerivative · entry 3

Weber David A. · CIK 0001538965 · VP, Gas Supply · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,849

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000058 · form4.xml · nonDerivative · entry 2

Weber David A. · CIK 0001538965 · VP, Gas Supply · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,849.604

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000058 · form4.xml · nonDerivative · entry 1

Weber David A. · CIK 0001538965 · VP, Gas Supply · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,786.604

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000054 · form4.xml · nonDerivative · entry 2

WILSON BRODY J · CIK 0001571275 · VP, Treas, Controller & CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,947

F3 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

F2 · balance_after: Includes 2,172 time-based restricted stock units granted under the Long Term Incentive Plan of the Issuer. The restricted stock units vest in two equal installments on each of September 1, 2026 and 2027.

SEC source: 0001733998-26-000054 · form4.xml · nonDerivative · entry 1

WILSON BRODY J · CIK 0001571275 · VP, Treas, Controller & CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,884

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

F2 · balance_after: Includes 2,172 time-based restricted stock units granted under the Long Term Incentive Plan of the Issuer. The restricted stock units vest in two equal installments on each of September 1, 2026 and 2027.

SEC source: 0001733998-26-000066 · form4.xml · nonDerivative · entry 4

RUSH KIMBERLY HEITING · CIK 0001629836 · President · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,063

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000066 · form4.xml · nonDerivative · entry 3

RUSH KIMBERLY HEITING · CIK 0001629836 · President · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,063.3758

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000066 · form4.xml · nonDerivative · entry 2

RUSH KIMBERLY HEITING · CIK 0001629836 · President · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,064.1608

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000066 · form4.xml · nonDerivative · entry 1

RUSH KIMBERLY HEITING · CIK 0001629836 · President · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,064.1608

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000075 · form4.xml · nonDerivative · entry 1

Kaszuba Raymond J III · CIK 0001649589 · SVP & Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,939

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

F2 · balance_after: Includes 5,210 time-based restricted stock units granted under the Long Term Incentive Plan of the Issuer. The restricted stock units vest in two equal installments on each of September 1, 2026 and 2027.

SEC source: 0001733998-26-000073 · form4.xml · nonDerivative · entry 3

Rogers Melinda B. · CIK 0001748944 · VP, Chief HR and · Diversity Officer, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,214

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000073 · form4.xml · nonDerivative · entry 2

Rogers Melinda B. · CIK 0001748944 · VP, Chief HR and · Diversity Officer, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,214.13

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000073 · form4.xml · nonDerivative · entry 1

Rogers Melinda B. · CIK 0001748944 · VP, Chief HR and · Diversity Officer, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,346.13

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of 513 restricted stock units (RSUs) with performance threshold, and vesting of 651 time-based RSUs. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026. The 651 time-based RSUs are part of 2,064 time-based RSUs that have been reported as shares beneficially owned by the reporting person since initially reported on the reporting persons Form 4 on February 25, 2022.

SEC source: 0001733998-26-000077 · form4.xml · nonDerivative · entry 4

Kravitz Zachary D · CIK 0001940844 · VP, Regulatory Affairs and · Resource Planning, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,738

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000077 · form4.xml · nonDerivative · entry 3

Kravitz Zachary D · CIK 0001940844 · VP, Regulatory Affairs and · Resource Planning, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,738.5252

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000077 · form4.xml · nonDerivative · entry 2

Kravitz Zachary D · CIK 0001940844 · VP, Regulatory Affairs and · Resource Planning, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,739.0562

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000077 · form4.xml · nonDerivative · entry 1

Kravitz Zachary D · CIK 0001940844 · VP, Regulatory Affairs and · Resource Planning, NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,676.0562

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of 285 restricted stock units (RSUs) with performance threshold, and vesting of 60 time-based RSUs. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026. The 60 time-based RSUs are part of 240 time-based RSUs that have been reported as shares beneficially owned by the reporting person since initially reported on the reporting person's Form 3 on August 4, 2022.

SEC source: 0001733998-26-000079 · form4.xml · nonDerivative · entry 2

Williams Kathryn M · CIK 0001772924 · VP, Chief PA & Sustainability · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,111

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000079 · form4.xml · nonDerivative · entry 1

Williams Kathryn M · CIK 0001772924 · VP, Chief PA & Sustainability · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,960

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000060 · form4.xml · nonDerivative · entry 4

Karney Joseph S · CIK 0001972619 · VP, Eng. & Utility Operations · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,510

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000060 · form4.xml · nonDerivative · entry 3

Karney Joseph S · CIK 0001972619 · VP, Eng. & Utility Operations · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,510.5675

F3 · shares: Disposition of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-26-000060 · form4.xml · nonDerivative · entry 2

Karney Joseph S · CIK 0001972619 · VP, Eng. & Utility Operations · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,511.1415

F2 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2026.

SEC source: 0001733998-26-000060 · form4.xml · nonDerivative · entry 1

Karney Joseph S · CIK 0001972619 · VP, Eng. & Utility Operations · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,147.1415

F1 · shares: Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of 231 restricted stock units (RSUs) with a performance threshold and vesting of 54 time-based RSUs. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 27, 2026. The 54 time-based RSUs are part of 180 time-based RSUs that have been reported as shares beneficially owned by the reporting person since initially reported on the reporting persons Form 3 on April 12, 2023.

SEC source: 0001733998-26-000050 · form4.xml · nonDerivative · entry 1

Bragdon Peter J · CIK 0001297763 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,339.058

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about September 22, 2025.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000049 · form4.xml · nonDerivative · entry 1

McDonough Sandra · CIK 0001901349 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 10,610.822

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about January 6, 2022. At the time made, the election was intended to satisfy the then-current Rule 10b5-1. The election has not been entered into, modified or terminated since the original election date.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000048 · form4.xml · nonDerivative · entry 1

Ludford Mary E · CIK 0001959466 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 3,864.435

F1 · kind: The reporting transaction was effected pursuant to a written election under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives made on or about September 13, 2024.

F2 · ownership.nature: Shares have been credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives.