Exhibit 99.1 FOR IMMEDIATE RELEASE For further information contact: Investor Relations Department Country/City Code 8862 Tel: 2656-8000 IR@gigamedia.com.tw GigaMedia Announces Second-Quarter 2023 Financial Results TAIPEI, Taiwan, July 31, 2023 – GigaMedia Limited (NASDAQ: GIGM) today announced its secondquarter 2023 unaudited financial results. Comments from Management In the second quarter of 2023, GigaMedia reported revenues of $1.03 million, with a gross profit $0.57 million, an operating loss of $0.92 m ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commiss ...

Exhibit 99.1 FOR IMMEDIATE RELEASE For further information contact: Investor Relations Department Country/City Code 8862 Tel: 2656-8096 IR@gigamedia.com.tw GigaMedia Announces Fourth-Quarter and Full Year 2022 Financial Results TAIPEI, Taiwan, March 31, 2023 – GigaMedia Limited (NASDAQ: GIGM) today announced its unaudited financial results for the fourth quarter and full year of 2022. Highlights for Year Ended December 31, 2022 For 2022, GigaMedia reported revenues of $5.6 million, with a gross profit of $3 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commiss ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended For the fiscal year ended December 31, 2018 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EX ...