[Amended] Treasury share disposal: results report

What happened

Amendment report July 21, 2026 1. Document being amended: treasury share disposal results report 2. Original filing date of document being amended: 2026-01-19 3. Amendment details

Item: 2. Disposal report details - c. Type and number of shares in the disposal report Reason for amendment: an employee departure occurred Before: ASTech Co., Ltd. common shares, 12,465 shares After: ASTech Co., Ltd. common shares, 12,285 shares

Item: 3. Disposal details - disposal quantity Reason for amendment: an employee departure occurred Before: 12,465 After: 12,285

Item: 3. Disposal details - total disposal value Reason for amendment: an employee departure occurred Before: 202,680,900 After: 199,754,100

Item: 4. Whether the disposal report details match the actual disposal details Reason for amendment: an employee departure occurred Before: planned shares for disposal (common/other): 13,285 / -; total shares disposed (common/other): 12,465 / - After: planned shares for disposal (common/other): 13,285 / -; total shares disposed (common/other): 12,285 / -

Item: 5. Holding status of treasury shares after disposal Reason for amendment: an employee departure occurred Before: common shares, quantity 31,415, ratio 0.56%, total value 147,191,860; total, quantity 31,415, ratio 0.56%, amount 147,191,860 After: common shares, quantity 31,595, ratio 0.56%, total value 150,118,660; total, quantity 31,595, ratio 0.56%, amount 150,118,660

Treasury share disposal results report To the Governor of the Financial Supervisory Service January 19, 2026 Company name: ASTech Co., Ltd. Representative Directors: Yoon Jong-bae, Lee Seung-jae Head office address: 13, Janghangsandan 7-gil, Janghang-eup, Seocheon-gun, Chungcheongnam-do (Phone) 041-957-9911 (Website) http://www.astech.co.kr Preparer: (Title) Managing Director (Name) Hwang Jae-min (Phone) 041-957-9911

1. Name and address of the issuer a. Name: ASTech Co., Ltd. b. Address: 13, Janghangsandan 7-gil, Janghang-eup, Seocheon-gun, Chungcheongnam-do 2. Disposal report details a. Material event report filing date: January 14, 2026 b. Disposal period: from January 15, 2026 to January 15, 2026 c. Type and number of shares in the disposal report: ASTech Co., Ltd. common shares, 12,285 shares 3. Disposal details (Unit: KRW, shares) Date: January 15, 2026; Type: common stock; Disposal target: -; Order quantity: -; Disposal quantity: 12,285; Price per share disposed: 16,260; Total disposal value: 199,754,100; Brokerage: -; Business entity ID: - Total: Disposal quantity 12,285; Price per share 16,260; Total disposal value 199,754,100

4. Whether the disposal report details match the actual disposal details Planned shares for disposal (common/other): 13,285 / -; Total shares disposed (common/other): 12,285 / -; Match: mismatch; Reason for difference: an employee departure occurred

5. Holding status of treasury shares after disposal [as of January 19, 2026] (Unit: KRW, shares, %) Common shares: Holdings under Article 165-3 of the Act (A): quantity 31,595, ratio 0.56%, total value 150,118,660; Holdings under trust agreement under Article 165-3 (B): -; Total (A+B): quantity 31,595, ratio 0.56%, amount 150,118,660 Total: quantity 31,595, ratio 0.56%, amount 150,118,660