1721 Sanko

Release Date: July 12, 2026 Statement Date: July 11, 2026 Statement Time: 07:00:03 Company Code: 1721 Company Name: Sanko Subject: Announcement of company name change from "Sanko Co., Ltd." to "Guoqing Technology Co., Ltd." Announcement Period: July 1, 2026 to September 30, 2026. Applicable Clause: Item 51 Event Date: June 29, 2026 Details: 1. Event Date: June 29, 2026 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) Approval Date of 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. Other Matters to be Disclosed: (1) The company received the Ministry of Economic Affairs' approval notice for registration change on July 1, 2026. (2) According to Article 45 of the Taiwan Stock Exchange Corporation Business Rules, a name change requires continuous public announcement for three months. (3) The company's stock code remains unchanged; ordinary shares continue under "1721". (4) The company's English name remains unchanged as "SUNKO INK CO., LTD."