Northwest Natural Holding Company

Item 7.01 Regulation FD Disclosure. On September 23, 2026, Northwest Natural Holding Company (NW Holdings) issued a press release announcing a settlement in the Texas general rate case of its wholly owned indirect subsidiaries, SiEnergy Gas, LLC (SiEnergy Gas), Pines Gas, Inc. (Pines Gas) and Pines Gas Development, Inc. (Pines Gas Development). A copy of the press release is attached as Exhibit 99.1. The information contained in this Item 7.01 and in the accompanying exhibit shall not be incorporated by reference into any filing of NW Holdings, whether made before or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference to such filing. The information in this Item 7.01, including the exhibit hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended.

Item 8.01 Other Events As previously disclosed, on May 4, 2026, SiEnergy Gas, Pines Gas, and Pines Gas Development filed a request for a general rate increase (Rate Case) with the Railroad Commission of Texas (RRC). The filing included a request to consolidate the corporate, regulatory and rate structures of these entities and requested an overall revenue requirement increase of $12.0 million. On September 22, 2026, SiEnergy Gas, Pines Gas, Pines Gas Development, the staff of the RRC, the coalition of cities served by SiEnergy Gas, and other municipal parties to the Rate Case filed a settlement with the RRC that addresses all issues in the Rate Case (Stipulation). The Stipulation provides for the consolidation of SiEnergy Gas, Pines Gas, and Pines Gas Development as well as the establishment of systemwide rates. The Stipulation provides for a revenue requirement increase of approximately $8.6 million, a capital structure consisting of 59.75% equity and 40.25% long-term debt, a return on equity of 9.8%, and an overall cost of capital of 8.0%. Rate base of the combined entities is approximately $343 million, representing a $177 million increase since the last rate case in 2023. The Stipulation further sets forth baseline factors for future interim rate adjustment filings under Texas' Gas Reliability Infrastructure Program (GRIP), which allows, subject to refund, recovery on and of incremental changes in invested capital between rate cases (subject to a prudence review conducted in the next rate case filing). To participate in the GRIP program, SiEnergy must make an initial filing within two years of its Rate Case filing. The Stipulation is subject to the review and approval of the RRC. For new rates to be effective, the RRC must issue an order, which may approve, modify or deny the terms of the Stipulation. New rates are expected to take effect in November 2026. Forward-Looking Statements This report, and other presentations made by NW Holdings from time to time, may contain forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as “anticipates,” “assumes,” “continues,” “could,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects,” “will” and similar references to future periods. Examples of forward-looking statements include, but are not limited to, statements regarding the following: plans, objectives, assumptions, expectations, estimates, timing, goals, strategies, commitments, expenses, future events, investments, targeted capital structure, cost of capital, return on equity, rate base, depreciation rates, financial results, financial position, revenue requirement, system and infrastructure reinforcement, expansion or reliability, costs, timing or benefits, revenues and earnings, performance, timing, outcome, potential challenges to, or effects of rate cases or other regulatory proceedings, mechanisms, approvals or recoveries, regulatory prudence reviews, anticipated regulatory actions or filings, timing of new rates, and other statements that are other than statements of historical facts. Forward-looking statements by NW Holdings are based on its current expectations and assumptions regarding its business, the economy, geopolitical factors, and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Actual results may differ materially from those contemplated by the forward-looking statements. You are therefore cautioned against relying on any of these forward-looking statements. Forward-looking statements are neither statements of historical fact nor guarantees or assurances of future operational, economic or financial performance. Important factors that could cause actual results to differ materially from those in the forward-looking statements are discussed by reference to the factors described in Part I, Item 1A “Risk Factors”, and Part II, Item 7 and Item 7A “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Quantitative and Qualitative Disclosures about Market Risk” in NW Holdings’ most recent Annual Report on Form 10-K and in Part I, Items 2 and 3 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Quantitative and Qualitative Disclosures About Market Risk”, and Part II, Item 1A, “Risk Factors”, in NW Holdings’ Quarterly Reports on Form 10-Q filed thereafter, which, among others, outline legal, regulatory and legislative risks, public health risks, financial, macroeconomic and geopolitical risks, growth and strategic risks, operational risks, business continuity and technology risks, environmental risks and risks related to NW Holdings’ water and renewables businesses. All forward-looking statements made in this report and all subsequent forward-looking statements, whether written or oral and whether made by or on behalf of NW Holdings, are expressly qualified by these cautionary statements. Any forward-looking statement speaks only as of the date on which such statement is made, and NW Holdings undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law. New factors emerge from time to time and it is not possible to predict all such factors, nor can NW Holdings predict the impact of each such factor or the extent to which any factor, or combination of factors, may cause results to differ materially from those contained in any forward-looking statements.