X0306 4/A 2022-12-19 2022-12-21 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001158840 KIM AGNES C C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 0 0 0 1 Member of 10% owner group (4) Common Stock 2022-12-19 4 F 0 93 24.47 D 69408308 I By spouse Common Stock 2022-12-19 4 F 0 88 24.47 D 69408308 I By spouse Common Stock 2610776 D Restricted Stock Units 2022-12-19 4 M 0 93 0.00 D Common Stock 93 8076 I By spouse Restricted Stock Units 2022-12-19 4 M 0 88 0.00 D Common Stock 88 10660 I By spouse The reported transaction involved the withholding of 93 shares of Common Stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") of the Reporting Person's spouse to pay income taxes associated with said spouse's becoming retirement eligible. When this transaction was reported on a Form 4 earlier today (the "Original Form 4"), the price in Table I, Column 4, line 2 was incorrectly reflected as zero and the associated footnote incorrectly stated that the shares were sold. In addition, the transaction was not reported in Table II. The reported transaction involved the withholding of 88 shares of the Issuer's Common Stock issuable upon the early vesting of an equal number of RSUs of the Reporting Person's spouse to pay income taxes associated with said spouse's becoming retirement eligible. When this transaction was reported on the Original Form 4, the price in Table I, Column 4, line 4 was incorrectly reflected as zero and the associated footnote incorrectly stated that the shares were sold. In addition, the transaction was not reported in Table II. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose. (4) The Reporting Person states that the filing of this Form 4 shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities owned by the other members of the group, for the purpose of Section 16, or for any other purpose. /s/ Richard D. Rosen, Attorney-in-Fact for Agnes C. Kim 2022-12-21