1721 Sanko Changes Name to Guoqing Technology

Release Date: August 11, 2026 Statement Date: August 10, 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 Corporation" 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 Corporation (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 Corporation (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 of registration on July 1, 2026. (2) According to Article 45 of the Operating Rules of Taiwan Stock Exchange Corporation, a continuous three-month public announcement is required after the name change. (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."