Exhibit 99.1 GCT Semiconductor Holding, Inc. Reports Second Quarter 2024 Financial Results SAN JOSE, CA – August 14, 2024 – GCT Semiconductor Holding, Inc. ("GCT" or the "Company") (NYSE: GCTS), a leading designer and supplier of advanced 5G and 4G semiconductor solutions, today reported financial results for the second quarter ended June 30, 2024. Second Quarter 2024 Financial Summary and Recent Operational Highlights · 5G chipset development progressing as projected with initial deliveries to alpha custom ...