X0508 4 2026-02-25 0001733998 Northwest Natural Holding Co NWN 0001940844 Kravitz Zachary D 250 SW TAYLOR ST PORTLAND OR 97204 false true false true VP, Regulatory Affairs and Resource Planning, NW Natural false Common Stock 2026-02-25 4 A false 285.0000 0.00 A 1913.8297 D Common Stock 2026-02-25 4 A false 1962.0000 0.00 A 3875.8297 D Common Stock 2026-02-25 4 A false 591.0000 0.00 A 861.6270 I See Footnote Common Stock 384.2050 I See Footnote 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. Includes 60 time-based RSUs granted under the Long Term Incentive Plan under the Issuer. The RSUs vest on March 1, 2026. 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. 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. Shares have been credited to the reporting persons account under the Northwest Natural Gas Company Deferred Compensation Plan for Directors and Executives. Shares held in reporting persons account under the Northwest Natural Gas Company Retirement K Savings Plan as of February 13, 2026. Molly J. Wilcox, Attorney-in-Fact 2026-02-27