1721 Sanko

Release Date: 1150718 Announcement Date: 1150717 Announcement Time: 70004 Company Code: 1721 Company Name: Sanko Subject: Announcement of the change of the company name from "Sanko Co., Ltd." to "Guoqing Technology Co., Ltd." Announcement Period: From July 1, 2026, to September 30, 2026 Applicable Clause: Clause 51 Date of Fact: 1150629 Explanation: 1. Date of Fact: June 29, 2026 2. Company Name: Guoqing Technology Co., Ltd. (Formerly: Sanko Co., Ltd.) 3. Relationship with the Company (Please enter the parent company or subsidiary): Parent Company 4. Mutual Shareholding Ratio: Not Applicable 5. Reason for Occurrence: (1) Company Name Change Approval Date/Fact Date: June 29, 2026 (2) Company Name Change Approval Document Number: 11530099260 (3) Shareholders' Meeting Resolution Date for Name Change Case: 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. Response Measures: None 7. Other Matters to be Stated: (1) The company received the approval letter for the change of registration from the Ministry of Economic Affairs on 2026/07/01. (2) According to the Business Regulations of the Taiwan Stock Exchange Corporation, the company must announce continuously for three months after the name change. (3) The company's stock code remains unchanged, and the common stock is still "1721". (4) The company's English name remains unchanged and is still "SUNKO INK CO., LTD.".