Amkor Technology Director Receives Routine Dividend Equivalent Units

Executive Summary

On September 24, 2026, Amkor Technology, Inc. ($AMKR) director Daniel JL Liao filed a Form 4 reporting the acquisition of 18.9745 Restricted Stock Units (RSUs) on September 22, 2026. The transaction reflects the automatic crediting of dividend equivalent units (DEUs) resulting from a cash dividend paid by the company, rather than a discretionary market purchase or sale.

Transaction Details

The filing details two separate derivative transactions:

• Transaction 1: Accrual of 14.9767 DEUs associated with time-vested RSUs initially granted on May 15, 2025. Following this transaction, Liao holds 9,917.4618 RSUs under this grant.
• Transaction 2: Accrual of 3.9978 DEUs associated with RSUs granted on May 13, 2026. Liao holds 2,619.5144 RSUs under this grant following the accrual.

Both tranches carry an exercise/conversion price of $0.00 and are subject to the same vesting terms as the underlying awards.

Market Significance

This filing carries Low trading significance. DEU accruals are standard administrative equity adjustments under employee and director stock incentive plans upon cash dividend distributions. They do not convey managerial sentiment or represent new open-market capital allocation.