NWN

SEC source: 0001733998-26-000044 · form4.xml · nonDerivative · entry 1

Lee Karen · CIK 0001839510 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 21,695.617

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: 0001733998-26-000036 · 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: 7,326

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F2 · balance_after: Includes 6,297 time-based restricted stock units granted under the Long Term Incentive Plan of Issuer. The restricted stock units vest in three equal installments on each of March 1, 2026, 2027 and 2028.

SEC source: 0001733998-26-000018 · 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: 1,747

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

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: 0001733998-26-000028 · form4.xml · nonDerivative · entry 2

Palfreyman Justin · CIK 0001686243 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 6,286

F2 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award, and credited to reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives pursuant to a prior election. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

F3 · ownership.nature: Shares have been credited to the reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000028 · form4.xml · nonDerivative · entry 1

Palfreyman Justin · CIK 0001686243 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,849

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

SEC source: 0001733998-26-000034 · 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: 40,540

F2 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

SEC source: 0001733998-26-000034 · 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: 32,687

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

SEC source: 0001733998-26-000022 · form4.xml · nonDerivative · entry 2

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,850

F2 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

SEC source: 0001733998-26-000022 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,181

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

SEC source: 0001733998-26-000024 · 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: 3,332.604

F2 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

SEC source: 0001733998-26-000024 · 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: 1,370.604

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

SEC source: 0001733998-26-000042 · 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: 15,430

F3 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

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: 0001733998-26-000042 · 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: 13,468

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

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: 0001733998-26-000032 · form4.xml · nonDerivative · entry 2

RUSH KIMBERLY HEITING · CIK 0001629836 · President · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,933.6773

F2 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

SEC source: 0001733998-26-000032 · form4.xml · nonDerivative · entry 1

RUSH KIMBERLY HEITING · CIK 0001629836 · President · NW Natural

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,647.6773

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

SEC source: 0001733998-26-000038 · 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: 8,741

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

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: 0001733998-26-000030 · 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: 8,493

F2 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

SEC source: 0001733998-26-000030 · 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: 6,531

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

SEC source: 0001733998-26-000040 · 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: Indirect · See Footnote

Disclosed balance after: 861.627

F4 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards, and credited to reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives pursuant to a prior election. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F5 · ownership.nature: Shares have been credited to the reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000040 · 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: 3,875.8297

F3 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

F2 · balance_after: Includes 60 time-based RSUs granted under the Long Term Incentive Plan under the Issuer. The RSUs vest on March 1, 2026.

SEC source: 0001733998-26-000040 · 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: 1,913.8297

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F2 · balance_after: Includes 60 time-based RSUs granted under the Long Term Incentive Plan under the Issuer. The RSUs vest on March 1, 2026.

SEC source: 0001733998-26-000026 · form4.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 981.866

F4 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards, and credited to reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives pursuant to a prior election. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F5 · balance_after: Includes 6 time-based RSUs granted under the Long Term Incentive Plan of the Issuer. The reporting person previously elected that shares received on vesting of such RSUs will be deferred under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives. The RSUs vest on March 1, 2026.

F6 · ownership.nature: Shares have been credited to the reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000026 · 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: 5,264.1946

F3 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

F2 · balance_after: Includes 54 time-based RSUs granted under the Long Term Incentive Plan of the Issuer. The RSUs vest on March 1, 2026.

SEC source: 0001733998-26-000026 · 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: 3,793.1946

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F2 · balance_after: Includes 54 time-based RSUs granted under the Long Term Incentive Plan of the Issuer. The RSUs vest on March 1, 2026.

SEC source: 0001733998-26-000016 · form4.xml · nonDerivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 11,256.78

F6 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award, and credited to reporting person?s account under Northwest Natural Gas Company?s Deferred Compensation Plan for Directors and Executives pursuant to a prior election. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

F5 · ownership.nature: Shares have been credited to the reporting person's account under Northwest Natural Gas Company?s Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000016 · 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: Indirect · See Footnote

Disclosed balance after: 9,490.78

F4 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards, and credited to reporting person?s account under Northwest Natural Gas Company?s Deferred Compensation Plan for Directors and Executives pursuant to a prior election. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F5 · ownership.nature: Shares have been credited to the reporting person's account under Northwest Natural Gas Company?s Deferred Compensation Plan for Directors and Executives.

SEC source: 0001733998-26-000016 · 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: 2,877.13

F3 · shares: Shares are issuable as a result of satisfaction of performance goals for 2023-2025 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date.

F2 · balance_after: Includes 651 time-based restricted stock units granted under Issuer?s Long Term Incentive Plan. The restricted stock units vest on March 1, 2026.

SEC source: 0001733998-26-000016 · 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: 2,681.13

F1 · shares: Shares are issuable as a result of satisfaction of the performance threshold for 2025 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date.

F2 · balance_after: Includes 651 time-based restricted stock units granted under Issuer?s Long Term Incentive Plan. The restricted stock units vest on March 1, 2026.

SEC source: 0001733998-26-000002 · form4.xml · nonDerivative · entry 3

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 8,800.689

F3 · shares: Pursuant to the DCP and the reporting person's prior elections, shares were withheld to cover withholding taxes on the distribution of shares from the DCP.

F2 · ownership.nature: Reflects shares that have been credited to reporting person's account under the DCP.

SEC source: 0001733998-26-000002 · form4.xml · nonDerivative · entry 2

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,220

F1 · shares: Shares were distributed from reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives (DCP) to reporting person's brokerage account pursuant to reporting person's elections on December 10, 2013, November 18, 2014, December 2, 2015, December 7, 2016 and December 4, 2017.

SEC source: 0001733998-26-000002 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 9,346.689

F1 · shares: Shares were distributed from reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives (DCP) to reporting person's brokerage account pursuant to reporting person's elections on December 10, 2013, November 18, 2014, December 2, 2015, December 7, 2016 and December 4, 2017.

F2 · ownership.nature: Reflects shares that have been credited to reporting person's account under the DCP.

SEC source: 0001733998-25-000193 · form4.xml · nonDerivative · entry 2

Saathoff MardiLyn · CIK 0001445672 · Gen'l Counsel, CCO & SVP, Reg

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,458

F1 · shares: Disposition was due to the sale of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-25-000193 · form4.xml · nonDerivative · entry 1

Saathoff MardiLyn · CIK 0001445672 · Gen'l Counsel, CCO & SVP, Reg

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,458.787

F1 · shares: Disposition was due to the sale of fractional shares in connection with the transfer of whole shares between accounts directly held by the reporting person.

SEC source: 0001733998-25-000187 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,954

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,567 shares of which 10,613 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $47.74 to $48.1650, resulting in a weighted average price of $47.9490. 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: 0001733998-25-000185 · form4.xml · nonDerivative · entry 1

Bragdon Peter J · CIK 0001297763 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,227.681

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: 0001733998-25-000183 · form4.xml · nonDerivative · entry 1

Ludford Mary E · CIK 0001959466 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 3,312.224

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: 0001733998-25-000181 · form4.xml · nonDerivative · entry 1

McDonough Sandra · CIK 0001901349 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 10,172.28

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: 0001733998-25-000178 · form4.xml · nonDerivative · entry 1

Lee Karen · CIK 0001839510 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 20,325.829

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: 0001733998-25-000170 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 44,422

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $46.08 to $46.65, resulting in a weighted average price of $46.3935. 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: 0001733998-25-000168 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 51,922

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $45.00 to $45.02, resulting in a weighted average price of $45.0007. 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: 0001733998-25-000166 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,431

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

SEC source: 0001733998-25-000164 · 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: 2,463

F1 · balance_after: Common stock pursuant to restricted stock units granted under Northwest Natural Holding Company's Long Term Incentive Plan. One third of the restricted stock units shall vest on each of October 1, 2026, 2027 and 2028.

SEC source: 0001733998-25-000161 · form4.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,379

F1 · shares: Shares were withheld by Issuer to cover withholding taxes on issuance of time-based restricted stock units which vested on October 1, 2025.

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

SEC source: 0001733998-25-000158 · form4.xml · nonDerivative · entry 2

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 67,361

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

SEC source: 0001733998-25-000158 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 67,689

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $45.0000 to $45.0300, resulting in a weighted average price of $45.0077. 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: 0001733998-25-000156 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 71,922

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $41.65 to $42.61, resulting in a weighted average price of $42.1339. 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: 0001733998-25-000151 · 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: 12,364

F1 · shares: Shares were withheld by Issuer to cover withholding taxes on issuance of time-based restricted stock units which vested on September 1, 2025.

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

SEC source: 0001733998-25-000149 · 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: 7,052

F1 · shares: Shares were withheld by Issuer to cover withholding taxes on issuance of time-based restricted stock units which vested on September 1, 2025.

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

SEC source: 0001733998-25-000140 · form4.xml · nonDerivative · entry 1

ANDERSON DAVID HUGO · CIK 0001241405 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,717

F1 · kind: Transaction made pursuant to a Rule 10b5-1 trading plan established by the reporting person on September 16, 2024. 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 8 times his annual salary in NW Holdings' stock; an amount greater than required by the NW Holdings' stock ownership requirements. 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. As of the date of this filing, Mr. Anderson holds the following shares that are not subject to his trading arrangement: 47,459 shares of which 10,505 are held in Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Officers and 36,954 are held in his trust.

F2 · price: This transaction was executed in multiple trades on reported date with prices ranging from $40.16 to $40.57, resulting in a weighted average price of $40.4293. 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: 0001733998-25-000138 · form4.xml · nonDerivative · entry 1

McDonough Sandra · CIK 0001901349 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 9,458.071

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.