1721 Sanko

Release Date: July 26, 2026 Statement Date: July 25, 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.", with announcement period from July 1, 2026 to September 30, 2026. Applicable Clause: Clause 51 Factual Date: June 29, 2026 Details: 1. Factual Date: June 29, 2026 2. Company Name: Guoqing Technology Co., Ltd. (formerly Sanko Co., Ltd.) 3. Relationship with Company (enter "本公司" or "subsidiary"):本公司 4. Cross-shareholding Ratio: Not applicable 5. Reason for Change: (1) Approval Date of Name Change / Factual Date: June 29, 2026 (2) Approval Document Number for Name Change: 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 letter for change registration on July 1, 2026. (2) According to Article 45 of the Rules of Operation of Taiwan Stock Exchange Corporation, the company must make continuous announcements 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 and continues to be "SUNKO INK CO., LTD."