Form 4 Filing for AMKOR TECHNOLOGY, INC. by KIM JAMES J

This filing details transactions of AMKOR TECHNOLOGY, INC. common stock by James J. Kim, a 10% owner. On December 19, 2025, Mr. Kim distributed 3,244,594 shares to the 2025 Grantor Retained Annuity Trust No. 1 of James J. Kim, retaining 61,645 shares. Additionally, on the same date, Mr. Kim's spouse, Agnes C. Kim, distributed 2,538,000 shares to the 2025 Grantor Retained Annuity Trust No. 1 of Agnes C. Kim. The filing also clarifies previous reporting errors concerning share distributions from trusts to Mr. Kim's revocable trust. Mr. Kim disclaims beneficial ownership of certain securities except to the extent of his pecuniary interest. The total indirect holdings through various trusts for the benefit of family members amount to 9,786,032 shares, with an additional 164,678 shares held through a limited liability company.