NWN · Northwest Natural Holding Co

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.

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.

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.

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.

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.

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

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.

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

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.

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.

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

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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

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

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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

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.

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.

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.

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.

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.

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

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

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.

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.

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

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.

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

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.

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

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.

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

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.

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

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.

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.

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.

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