AMKOR TECHNOLOGY, INC.

On May 8, 2026, Douglas A. Alexander, adirector of Amkor, adopted a “Rule 10b5-1 trading arrangement” as such term is defined in paragraph (a) of Item 408 of Regulation S-K promulgated under the Securities Act, which is intended to satisfy the affirmative defense of Rule 10b5-1(c). Mr. Alexander’s Rule 10b5-1 trading arrangement will terminate on the earliest of: (a)May 7, 2027; (b) the first date on which all trades have been executed or all trading orders relating to such trades have expired; and (c) the date on which Mr. Alexander gives notice to terminate his Rule 10b5-1 trading arrangement.20,000 shares of our common stock are to be sold under Mr. Alexander’s Rule 10b5-1 trading arrangement.

On June 9, 2026, Mark N. Rogers, Amkor’s Executive Vice President, General Counsel and Corporate Secretary adopted a “Rule 10b5-1 trading arrangement” as such term is defined in paragraph (a) of Item 408 of Regulation S-K promulgated under the Securities Act, which is intended to satisfy the affirmative defense of Rule 10b5-1(c). Mr. Rogers’ Rule 10b5-1 trading arrangement will terminate on the earliest of: (a)May 28, 2027; (b) the first date on which all trades have been executed or all trading orders relating to such trades have expired; and (c) the date on which Mr. Rogers gives notice to terminate his Rule 10b5-1 trading arrangement.45,000 shares of our common stock are to be sold under Mr. Rogers’ Rule 10b5-1 trading arrangement.

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In July 2026, operations at our facility in Kumamoto, Japan were interrupted by earthquakes in the region. We have initiated emergency response procedures and are currently assessing the status of employee safety, facilities, manufacturing operations, and product conditions across the affected site.