[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.