西北天然气 2025年度报告

Form 11-K (Mark One)[X]ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December31, 2025 OR []TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from ___________ to____________ Commission file number 1-38681 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: NORTHWEST NATURAL GAS COMPANYRETIREMENT K SAVINGS PLAN B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: NORTHWEST NATURAL HOLDING COMPANY 250 SW Taylor StreetPortland, Oregon 97204 NORTHWEST NATURAL GAS COMPANYRETIREMENT K SAVINGS PLAN TABLE OF CONTENTS PageReport of Independent Registered Public Accounting Firm2 Financial Statements Statements of Changes in Net Assets Available for Benefits for the years ended December 31, 2025and 20244 Form 5500, Schedule H, Line 4i; Schedule of Assets (Held at End of Year) Signatures Exhibits Other schedules required by Section 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting andDisclosure under the Employee Retirement Income Security Act of 1974 (“ERISA”) have been omitted because they are notapplicable.(1) REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Plan Administrator and Plan ParticipantsNorthwest Natural Gas Company Retirement K Savings Plan Opinion on the financial statementsWe have audited the accompanying statements of net assets available for benefits of Northwest Natural Gas Company Retirement K Savings Plan (the “Plan”) as of December31, 2025 and 2024, the related statements of changes in netassets available for benefits for the years then ended, and the related notes (collectively referred to as the “financialstatements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available forbenefits of the Plan as of December31, 2025 and 2024, and the changes in net assets available for benefits for the yearsthen ended in conformity with accounting principles generally accepted in the United States of America. Basis for opinionThese financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public CompanyAccounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Plan inaccordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and ExchangeCommission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan andperform the audit to obtain reasonable assurance about whether the financial statements are free of materialmisstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an auditof its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internalcontrol over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internalcontrol over financial reporting. Accordingly, we express no such opinion. Our audits included performing procedures to assess the risks of material misstatement of the financial statements,whether due to error or fraud, and performing procedures that respond to those risks. Such procedures includedexamining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits alsoincluded evaluating the accounting principles used and significant estimates made by management, as well as evaluatingthe overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion. Supplemental informationThe supplemental schedule of the delinquent participant contributions for the year ended December31, 2025 and schedule of assets (held at end of year) as of December31, 2025 (“supplemental information”) has been subjected toaudit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental informationis the responsibility of the Plan’s management. Our audit procedures included determining whether the supplementalinformation reconciles to the financial statements or the underlying accounting and other records, as applicable, andperforming procedures to test the completeness and accuracy of the information presented in the supplementalinformation. In forming our opinion on the supplemental information, we evaluated whether the supplemental information,including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations forReporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, th