AMKOR TECHNOLOGY, INC. · Exercise / conversion · Common Stock

What does this filing report?

An SEC Form 4 filing for AMKOR TECHNOLOGY, INC. records an exercise / conversion involving Common Stock on December 16, 2025. The reported quantity was 20,000. The filing date is December 17, 2025. This is one transaction record; amounts are not allocated among any joint reporting owners.

The acquisition category describes how securities were received. It does not by itself establish a cash purchase of common stock. Read the transaction code definitionsand the original filing before interpreting the amounts.

Filing footnotes & remarks

F1

The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 1, 2025.

F2

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $42.15 to $43.65. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.

F3

This stock option (the "Option") to acquire 200,000 shares of the Issuer's common stock (the "Option Shares") was granted on June 10, 2019 (the "Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Option Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option vested on the fourth anniversary of the Option Grant Date.

Footnotes are reproduced as plain text from the current source filing. For the full context, read the original SEC filing.