Additional Proxy Soliciting Materials (Form DEFA14A)

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. )

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):

Your Vote Counts! AMPCO-PITTSBURGH CORPORATION 2026 Annual Meeting Vote by May 7, 2026 11:59 PM ET AMPCO-PITTSBURGH CORPORATION C/O BROADRIDGE P.O. BOX 1342 BRENTWOOD, NY 11717 You invested in AMPCO-PITTSBURGH CORPORATION and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on May 8, 2026. Get informed before you vote View the Notice and Proxy Statement and Annual Report on Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 24, 2026. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote in Person at the Meeting* May 8, 2026 10:00 A.M. EDT Founders Room 1st Floor The Duquesne Club 325 Sixth Avenue Pittsburgh, PA 15222 *Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares.

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items 1. Election of Directors Nominees: 01) J. Brett McBrayer 02) Darrell L. McNair 2. To approve, in a non-binding, advisory vote, the compensation of the named executive officers. 3. To ratify the appointment of BDO USA, P.C. as the independent registered public accounting firm for 2026. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Board Recommends For For For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings".