[Huang Chang] Announcement of Board Resolution on Stock Buyback (Correction of Buyback Period)

1. Date of Board resolution: May 19, 2026 2. Purpose of buyback: Transfer of shares to employees 3. Type of shares: Common stock 4. Maximum total amount for buyback: 4,192,993,463 TWD 5. Scheduled period for buyback: May 19, 2026, to July 18, 2026 6. Number of shares to be bought back: 20,000,000 shares 7. Price range: 35.00 - 70.00 TWD (continue buyback if market price is lower than the lower bound) 8. Method: Market purchase on the centralized exchange 9. Ratio of shares to be bought back to total issued shares: 3.78% 10. Accumulated shares currently held: 0 11. Past buyback records (past 5 years): Nov 14, 2025 - Jan 13, 2026, planned 10M shares, executed 3.842M shares (38.00% execution rate) 12. Unexecuted buybacks: Not applicable 13. Board meeting minutes: 4th Board Meeting of 2026 14. Regulation for employee transfer: Based on the '7th Buyback and Employee Transfer Rules' of Huang Chang Construction, transfer to take place within 5 years. 15. Conversion regulations: Not applicable 16. Financial status declaration: Buyback does not impact capital maintenance. 17. Rationality assessment: Assessed as reasonable by Uni-President Securities Corp. 18. Others: None