X0306 4 2021-12-31 1 0001325702 MAGNACHIP SEMICONDUCTOR Corp MX 0001812827 Woo Young Soo C/O MAGNACHIP SEMICONDUCTOR, LTD., 501, TEHERAN-RO, GANGNAM-GU SEOUL M5 06168 KOREA, REPUBLIC OF 0 1 0 0 See Remarks Common Stock 2021-12-31 4 F 0 1016 20.97 D 23697 D This transaction represents the withholding by the Issuer of 1,016 shares of common stock to satisfy tax withholding obligations incurred by the Reporting Person upon the vesting of 2,237 shares of common stock originally awarded to the Reporting Person on February 19, 2021. Resigned as Chief Financial Officer and Principal Financial Officer of the Issuer, effective at the end of December 31, 2021. /s/ Theodore Kim, Attorney-in-Fact 2022-01-04