Form 4 Filing for Gil C. Tily

This filing details a transaction by Gil C. Tily, a director at AMKOR TECHNOLOGY, INC. (AMKR), on September 22, 2026. The transaction involved the acquisition of 3.9978 Restricted Stock Units (RSUs) with a transaction price of $0.00. These RSUs are part of an equity grant from May 13, 2026, and represent dividend equivalent units accrued upon a dividend payment. The RSUs are subject to the same vesting provisions as the original grant. Following this transaction, Tily holds 2619.5144 shares. The filing was signed by Mark N. Rogers as Attorney-in-Fact for Gil C. Tily on September 24, 2026.