AMPCO PITTSBURGH CORP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

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:

Ampco–Pittsburgh Corporation

(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):

726 Bell Avenue, Suite 301, Carnegie, Pennsylvania 15106

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

TO BE HELD FRIDAY, MAY 8, 2026

TO THE SHAREHOLDERS OF

AMPCO-PITTSBURGH CORPORATION

Notice is hereby given that the Annual Meeting of Shareholders of Ampco-Pittsburgh Corporation (“Ampco” or the “Corporation”) will be held in the Founders Room, 1st Floor, The Duquesne Club, 325 Sixth Avenue, Pittsburgh, Pennsylvania, at 10:00 A.M., Eastern Time on Friday, May 8, 2026, for the following purposes:

to elect two directors for a term that expires in 2029;

to hold a non-binding advisory vote to approve the compensation of our named executive officers;

to ratify the appointment of BDO USA, P.C. as the independent registered public accounting firm for 2026; and

to transact such other business as may properly come before the meeting and any adjournment or postponement thereof.

The foregoing items of business are more fully described in the Proxy Statement accompanying this Notice of Annual Meeting. The Board unanimously recommends that shareholders vote “FOR” both of the nominees for director named in the accompanying Proxy Statement and “FOR” each of Proposals 2 and 3 on the enclosed proxy card.

Only shareholders of record at the close of business on March 12, 2026 are entitled to notice of and to vote at the meeting and any adjournment or postponement thereof. The Annual Meeting may be adjourned or postponed from time to time. At any adjourned or postponed meeting, action with respect to matters specified in this notice may be taken without further notice to shareholders, unless required by law or the Corporation’s Amended and Restated By-laws (the “Bylaws”).

All shareholders are cordially invited to attend the Annual Meeting. Whether or not you expect to attend, we encourage you to submit your proxy as soon as possible using one of three convenient methods by (i) accessing the internet site described in the accompanying proxy statement and on the proxy card or voting instruction form provided to you, (ii) calling the toll-free number in the accompanying proxy statement and on the proxy card or voting instruction form provided to you, or (iii) completing, signing, dating and returning the enclosed proxy card promptly in the accompanying envelope, which requires no postage if mailed in the United States, or voting instruction form provided to you.

If your broker, bank, trustee or other similar organization is the holder of record of your shares (i.e., your shares are held in “street name”), you will receive a voting instruction form from the holder of record. You must provide voting instructions by filling out the voting instruction form in order for your shares to be voted. We recommend that you instruct your broker or other nominee to vote your shares on the enclosed proxy card. The proxy is revocable and will not affect your right to vote in person if you attend the Annual Meeting.

The Board, including all of its independent directors, unanimously recommends that you vote on the Proxy Card or voting instruction form “FOR” the election of Mr. J. Brett McBrayer and Mr. Darrell L. McNair.

If you are unable to attend the Annual Meeting, a replay of the meeting will be available onwww.ampcopgh.com/investors.

Regardless of the number of shares of Common Stock of the Corporation that you own, your vote is important. Thank you for your continued support, interest and investment in Ampco-Pittsburgh Corporation.

BY ORDER OF THE BOARD OF DIRECTORS

Kimberly P. Knox,

Corporate Secretary

Pittsburgh, Pennsylvania

March 27, 2026

Important Notice Regarding the Availability of Proxy Materials for

the Annual Meeting of Shareholders to Be Held on Friday, May 8, 2026

The proxy statement and the annual report of the Corporation are available at

http://www.ampcopgh.com/investors

For those requesting physical copies of our Annual Report for the year ending December 31, 2025, please mail such request to:

Ampco-Pittsburgh Corporation

c/o Corporate Secretary

726 Bell Avenue, Suite 301

P.O. Box 457

Carnegie, PA 15106

All shareholders are cordially invited to attend the Annual Meeting in person. Your vote is important, and, whether or not you expect to attend the Annual Meeting in person, it is requested that you PROMPTLY fill in, sign, and return the enclosed proxy card or follow the internet or telephone voting instructions included in the accompanying proxy statement and on the proxy card.

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