1721 Sanko

Release Date: July 3, 2026 Statement Date: July 2, 2026 Statement Time: 16:51:53 Company Code: 1721 Company Name: Sanko Subject: Announcement of company name change from "Sanko Co., Ltd." to "Guoqing Technology Co., Ltd.", with announcement period from July 1, 2026 to September 30, 2026. Applicable Clause: Item 51 Event Date: June 29, 2026 Details: 1. Event Date: June 29, 2026 (Minguo Year 115) 2. New Company Name: Guoqing Technology Co., Ltd. (formerly Sanko Co., Ltd.) 3. Relationship to Company:本公司 (This Company) 4. Cross-shareholding Ratio: Not applicable 5. Reasons for Change: (1) Date of Approval for Name Change / Event Date: June 29, 2026 (2) Approval Document Number: 11530099260 (3) Shareholders' Meeting Resolution Date for Name Change: June 16, 2026 (4) Previous Company Name: Sanko Co., Ltd. (5) New Company Name: Guoqing Technology Co., Ltd. (6) Previous Company Abbreviation: Sanko (7) New Company Abbreviation: Guoqing Technology 6. Countermeasures: None 7. Additional Disclosures: (1) The company received the Ministry of Economic Affairs' approval notice for change of registration on July 1, 2026. (2) According to Article 45 of the Taiwan Stock Exchange Corporation Business Rules, the company must publish a continuous announcement for three months following the name change. (3) The company's stock code remains unchanged; ordinary shares continue to be listed under "1721". (4) The company's English name remains unchanged as "SUNKO INK CO., LTD."