[Koja] Announcement on behalf of subsidiaries regarding accumulated acquisition of the same securities reaching 20% of paid-in capital

1. Name of securities: SSE 1-day Treasury bond reverse repo GC001 (Code: 204001). 2. Transaction date: 2026/04/22. 3. BoD approval date: N/A. 4. Other decision date: Approved by Chairman on 2026/04/22. 5. Volume, unit price, and total amount: Aipu: 55,420 units (1.380%); Baihong: 104,940 units (1.385%); Jiacai: 677,860 units (1.385%); Jiahuang: 163,900 units (1.385%); Jiaji: 117,670 units (1.385%); Kede: 468,440 units (1.385%); Jiajun: 361,290 units (1.380%). Total amount: 194,952,000 RMB (approx. 927,454,000 TWD). 6. Profit/loss on disposal: N/A. 7. Relationship with underlying company: Non-related party. 8. Accumulated holdings: Same as above. Pledge status: None. 9. Ratio of total assets: 19.63%; Ratio of shareholder equity: 26.06%. Operating capital: 2,515,979,000 TWD. 10. Purpose: Investment and wealth management. 11. Dissenting directors: None. 12. Related party transaction: No. 13-16. N/A or None.