[Chia Hsin Cement] Announcement of the company's estimated cumulative acquisition of securities reaching NT$300 million

1. Securities name: Taiwan Cement Corporation 2. Transaction date: 2025/4/15~2026/1/22 3. Date of board approval: Not applicable 4. Other approval dates: Approval level: Chairman's approval April 14, 2026 5. Transaction volume, unit price, and total transaction amount: (1) The company's cumulative transaction volume from 2025/04/15 to 2026/01/22: 10,933,000 shares; Cumulative transaction amount: NT$298,850 thousand. This time, it is planned to purchase shares of Taiwan Cement Corporation in the open market for no more than NT$290,000 thousand. Based on the closing price on 2026/4/14, the transaction volume is approximately 11,462,451 shares. (2) Cumulative transaction volume: 22,395,451 shares Cumulative total transaction amount: NT$588,850 thousand 6. Disposal profit (or loss) (not applicable to acquisition of securities): Not applicable 7. Relationship with the target company: Related party 8. As of now, the cumulative quantity, amount, shareholding ratio, and restricted rights (e.g., pledge status) of this transaction's securities (including this transaction): Chia Hsin Cement Corporation holds: Cumulative quantity held: 262,025,227 shares Cumulative amount held: NT$6,052,944 thousand Cumulative shareholding ratio: 3.393% Chia Hsin International Corporation holds: Cumulative quantity held: 120,767,847 shares Cumulative amount held: NT$2,777,660 thousand Cumulative shareholding ratio: 1.564% 9. As of now, the proportion of investment in securities listed in Article 3 of the 'Regulations Governing the Acquisition and Disposal of Assets by Public Companies' (including this transaction) to the company's total assets and equity attributable to owners of the parent in the most recent financial report, and the amount of working capital in the most recent financial report: Proportion of total assets: 86.50% Proportion of equity attributable to owners of the parent: 126.81% Working capital: NT$654,027 thousand 10. Specific purpose of acquisition or disposal: Strategic investment 11. Opinions of dissenting directors on this transaction: Not applicable 12. Is this transaction a related party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous major announcement regarding the same event: Not applicable 16. Other matters to be specified: None