1721 Sanko

Release Date: August 15, 2026 Statement Date: August 14, 2026 Statement Time: 7:00:03 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. 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: (1) Approval Date of Company 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) Company Abbreviation Before Change: Sanko (7) Company Abbreviation After Change: Guoqing Technology 6. Countermeasures: None 7. Other Matters to be Disclosed: (1) The Company received the Ministry of Economic Affairs' approval notice for change registration on July 1, 2026. (2) According to Article 45 of the Rules of Operation of Taiwan Stock Exchange Corporation, a continuous three-month announcement is required after the name change. (3) The Company's stock code remains unchanged; common shares continue to be listed under "1721". (4) The Company's English name remains unchanged as "SUNKO INK CO., LTD."