Ampco-Pittsburgh Officer Samuel Lyon's Stock Transactions and RSU Grant

This Form 4 filing reports stock transactions by Samuel Lyon, President of Union Electric at Ampco-Pittsburgh Corporation. On May 15, 2026, Lyon disposed of 30,227 shares through four separate transactions at $10.85 per share to cover tax liabilities related to the vesting of restricted stock units from 2023, 2024, 2025, and performance-based grants. Concurrently, he received a grant of 15,056 restricted stock units under the company's 2016 Omnibus Incentive Plan, which vest in three equal annual installments beginning one year after the grant date. Following these transactions, Lyon's total direct ownership stands at 191,280 shares. The filing represents routine equity compensation activity involving tax withholding on vested RSUs and the award of new restricted stock units to a company officer.