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 Third-Quarter 2025 Financial Results Comments from Management In the third quarter of 2025, GigaMedia reported revenues of $0.92 million, with a gross profit of$0.46 million, an operating loss of $1.00 million and the net loss of$0.97 million. The total revenues increased by 5.5% from $0.87 million last quarter, and increased 19.1% ...