1721 Sanko

Release Date: July 5, 2026 Statement Date: July 4, 2026 Statement Time: 7:00:03 Company Code: 1721 Company Name: Sanko Subject: Announcement of the company name change from "Sanko Co., Ltd." to "Guoqing Technology Co., Ltd.", with the announcement period from July 1, 2026 to September 30, 2026.

Applicable Clause: Clause 51 Event Date: June 29, 2026

Details: 1. Event Date: June 29, 2026 2. Company Name: Guoqing Technology Co., Ltd. (formerly Sanko Co., Ltd.) 3. Relationship with Company (please enter本公司or Subsidiary):本公司 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 for Name Change: 11530099260 (3) Shareholders' Meeting Resolution Date for Name Change: June 16, 2026 (4) Company Name Before Change: Sanko Co., Ltd. (5) Company Name After Change: 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 letter for change registration on July 1, 2026. (2) According to Article 45 of the Rules of Operation of Taiwan Stock Exchange Corporation, a three-month consecutive announcement is required after 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."