Northwest Natural Holding Co

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant

☑

Filed by a Party other than the Registrant

☐

Check the appropriate box:

NORTHWEST NATURAL HOLDING COMPANY

(Name of registrant as specified in its charter)

(Name of person(s) filing proxy statement, if other than the registrant)

Payment of Filing Fee (Check the appropriate box):

250 SW TAYLOR STREET

PORTLAND, OREGON 97204

(503)226-4211

April 17, 2026

Dear Shareholders of Northwest Natural Holding Company:

We cordially invite you to attend the 2026 Annual Meeting of Shareholders of Northwest Natural Holding Company, which will be held on Thursday, May 28, 2026, commencing at 2:00 p.m. Pacific Daylight Time, conducted via live webcast atwww.virtualshareholdermeeting.com/NWN2026. We have found that this format allows shareholders to participate regardless of where they are located, and affords our shareholders the same rights and access as if the meeting were held in person, including the ability to vote shares and submit questions electronically during the meeting.

At the meeting you will be asked to consider and vote upon three proposals: (1) the election of three Class III directors for terms of three years; (2) an advisory vote to approve named executive officer compensation; and (3) the ratification of the appointment of PricewaterhouseCoopers LLP as NW Holdings’ independent registered public accountants for the fiscal year 2026. Your Board of Directors unanimously recommends that you vote FOR each of Proposals 1, 2 and 3. In connection with the meeting, we enclose a notice of the meeting, a Proxy Statement, and a proxy card. You are entitled to participate in the Annual Meeting if you were a holder of record of NW Holdings common stock at the close of business on April 10, 2026, the record date set for the meeting. Please see page 2 for further instructions on attending the Annual Meeting.

Detailed information relating to NW Holdings’ business activities and operating performance is contained in our 2025 Annual Report, which is also enclosed. We also invite you to review NW Holdings’ annual Community and Sustainability report found athttps://ir.nwnaturalholdings.com/Sustainability, which highlights all of the work NW Holdings has accomplished in these areas.

It is important that your shares are represented and voted at the meeting. Whether or not you plan to attend, please vote your shares in one of three ways: via internet, telephone or mail. Instructions regarding internet and telephone voting are included on the proxy card or Voting Instruction Form. If you elect to vote by mail, please sign, date and return the proxy card or Voting Instruction Form in the enclosed postage-paid envelope. Your proxy may be revoked at any time before it is exercised in the manner set forth in the Proxy Statement.

NOTICE OF 2026 ANNUAL MEETING OF SHAREHOLDERS

To our Shareholders:

The 2026 Annual Meeting of Shareholders of Northwest Natural Holding Company (NW Holdings or the Company) will be held on Thursday, May 28, 2026 at 2:00 p.m. Pacific Daylight Time, in a virtual meeting format only, conducted via live webcast atwww.virtualshareholdermeeting.com/NWN2026 for the following purposes:

We are holding the Annual Meeting in an electronic meeting format to allow shareholders to participate regardless of their location. This format will allow you to vote your shares and submit questions electronically during the meeting in accordance with the rules of conduct for the meeting.

If you were a holder of record of NW Holdings common stock at the close of business on April 10, 2026, the record date set for the Annual Meeting, you will be entitled to vote upon all matters properly submitted to shareholder vote at the meeting.

Our Board of Directors is soliciting the proxies of all holders of NW Holdings common stock who may be unable to attend the meeting or who desire to vote by proxy before the meeting. These proxies also will instruct the fiduciary under NW Holdings’ Dividend Reinvestment and Direct Stock Purchase Plan to vote any shares held for shareholders’ benefit thereunder, as indicated on the proxies. In addition, the trustee of the Northwest Natural Retirement K Savings Plan (401(k) Plan) will vote any shares of NW Holdings common stock that are allocated to participants’ 401(k) Plan accounts as directed by the participants. To the extent participants do not provide voting directions, the trustee will vote the undirected shares in the same proportion as the 401(k) Plan shares for which voting directions are received. A proxy card and postage-paid return envelope are included for your convenience. No postage is required if mailed within the United States. You can also vote online or by telephone using the instructions on the enclosed proxy card or Voting Instruction Form.

Your vote is very important to us. Whether or not you plan to attend the Annual Meeting, we encourage you to vote as soon as possible by promptly marking, signing, dating, and returning the enclosed proxy card or Voting Instruction Form, or by granting a proxy via the Internet or telephone in accordance with the instructions on the enclosed proxy card or Voting Instruction Form. Prompt submission of your proxy will help us avoid the additional expense of further solicitation to ensure that a quorum is present. Shareholders may vote electronically at the virtual Annual Meeting even if they have previously submitted a proxy.

By Order of the Board of Directors,

Megan H. Berge

Senior Vice President, General Counsel,Chief Compliance Officer and Corporate Secretary

April 17, 2026

Portland, Oregon

Important Notice Regarding the Availability of Proxy Materials for the 2026 Annual Meeting of Shareholders

This Proxy Statement and our 2025 Annual Report are available atwww.nwnaturalholdings.com.