SCHEDULE 13D/A 0002096092 XXXXXXXX LIVE 1 Common Stock, par value $0.01 per share 01/14/2026 false 0001325702 55933J203 MAGNACHIP SEMICONDUCTOR Corp

C/O MAGNACHIP SEMICONDUCTOR, LTD. 15F, 76 JIKJI-DAERO, 436BEON-GIL CHEONGJU-SI M5 28581

Cristiano Amoruso 212-451-2300 Byreforge LLC 853 Broadway New York NY 10019 Andrew Freedman, Esq. 212-451-2300 Olshan Frome Wolosky LLP 1325 Avenue of the Americas New York NY 10019 0002096092 N Byreforge LLC WC N DE 0.00 3072779.00 0.00 3072779.00 3072779.00 N 8.5 OO 0002069371 N Amoruso Cristiano AF N L6 0.00 3072779.00 0.00 3072779.00 3072779.00 N 8.5 IN Common Stock, par value $0.01 per share MAGNACHIP SEMICONDUCTOR Corp C/O MAGNACHIP SEMICONDUCTOR, LTD. 15F, 76 JIKJI-DAERO, 436BEON-GIL CHEONGJU-SI M5 28581 Item 4 is hereby amended to add the following: On January 14, 2026, the Board appointed Cristiano Amoruso as a director of the Issuer to serve until the Issuer's 2026 Annual Meeting of Stockholders or until his successor has been duly elected and qualified, or until his earlier death, resignation, retirement, disqualification or removal. Mr. Amoruso has also been appointed to each of the Audit Committee, the Compensation Committee and the Nominating and Corporate Governance Committee of the Board. Byreforge LLC /s/ Cristiano Amoruso 01/20/2026 Amoruso Cristiano /s/ Cristiano Amoruso 01/20/2026