Officer/Director Transaction - AMKOR TECHNOLOGY, INC.

This filing details a transaction by Rutten Guillaume Marie Jean, a director at AMKOR TECHNOLOGY, INC. On June 30, 2026, 8,692 Restricted Stock Units (RSUs) vested. These RSUs were granted on February 20, 2025, and vested in five equal quarterly installments, with the final installment vesting on June 30, 2026. Concurrently, the director acquired 8,692 shares of Common Stock, bringing the total post-transaction shares to 511,732. The value of the vested RSUs and acquired shares at the time of transaction was $0 per share.