[CMC] Announcement of Acquisition of Securities

1. Name of securities: Compeq common stock 2. Trading date: 2026/4/17~2026/4/22 3. Board resolution date: N/A 4. Other decision dates: Decision level: Approved by the Chairman on April 22, 2026. 5. Transaction volume, unit price, and total amount: Volume (thousand shares): 1,600 Unit price (NT$): 250.43 Total amount (NT$): 400,684,151 6. Gain (or loss) on disposal: N/A 7. Relationship with the target company: None 8. Cumulative holding, amount, ratio, and encumbrances: Holding balance: 1,679,000 shares; Amount: NT$432,158,466 Shareholding ratio: 0.14%; Encumbrances: None 9. Ratio of securities investment to total assets and equity, and working capital: Ratio to total assets: 74.66% Ratio to equity: 104.57% Working capital: NT$8,285,327 thousand 10. Specific purpose of acquisition: Investment portfolio 11. Dissenting directors: None 12. Related-party transaction: No 13. Counterparty: N/A 14. Audit committee approval: N/A 15. Prior announcement on same event: N/A 16. Other matters: Authorized on 2026/03/31 to conduct securities trading in the centralized market during Q2 2026.