X0306 4/A 2021-05-13 2021-05-14 0 0000006176 AMPCO PITTSBURGH CORP AP 0001747181 Lyon Samuel 726 BELL AVENUE CARNEGIE PA 15106 0 1 0 0 President of Union Electric Common Stock 2021-05-13 4 A 0 18398 0.00 A 68845 D On May 14, 2021, the reporting person filed a Form 4 which erroneously reported that he had been awarded 17,248 shares of common stock incident to the award of restricted stock units in 2021. In fact, as reported in this amendment, the reporting person was awarded 18,398 shares of common stock. The subsequent transaction reported on August 17, 2021 shall be updated accordingly such that the total amount of securities beneficially owned by the reporting person reported in Column 5 of of Table I following such transactions is 74,248 shares of common stock. Represents a grant of restricted stock units under the Ampco-Pittsburgh Corporation ("Company") 2016 Omnibus Incentive Plan, as amended and restated as of May 13, 2021. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of Ampco-Pittsburgh Corporation common stock. Restricted stock units vest in three equal annual installments beginning on the first anniversary of the grant date. /s/ Rose Hoover for Samuel Lyon (POA previously filed) 2021-10-13