X0508 4 2025-09-26 0001851961 GCT Semiconductor Holding, Inc. GCTS 0001542775 Schlaefer John C/O GCT SEMICONDUCTOR HOLDING, INC. 2290 NORTH 1ST STREET, SUITE 201 SAN JOSE CA 95131 true true President, CEO & Class III Dir false Common Stock, par value $0.0001 per share 2025-09-26 4 J 0 555 0 A 202728 D The transaction is a distribution of 555 shares of Common Stock, for no consideration, by the Parakletos @ Venture Millennium Fund LP. to the Reporting Person. /s/Edmond Cheng, attorney-in-fact 2025-09-30