[建國] Announcement regarding securities acquisition by subsidiary SILVER SHADOW HOLDINGS LIMITED (cumulative within one year reached 300 million TWD)

1. Security Name: BlackRock ICS US$ Liq Acc 2. Date of transaction: July 25, 2025 – June 3, 2026 3. Board of Directors approval date: N/A 4. Other authorization date: Individual transactions approved by the Chief Investment Officer. June 3, 2026 5. Quantity, unit price, and total transaction amount: 91,766.81 units, $124.5032 - $128.8475 per unit, total $11,629,993.31 USD 6. Gain (or loss) from disposal: N/A 7. Relationship with the target company: Not a related party 8. Cumulative holdings to date: - Parent company: None - Subsidiary GOLDEN CANYON LIMITED: 48,438.50 units, original investment $6,120,381.25 - Subsidiary SILVER SHADOW HOLDINGS: 47,060.91 units, original investment $5,973,370.53 9. Ratio to total assets and parent owner's equity: 61.0492% of total assets; 118.5404% of parent owner's equity. Working capital: 686,126,000 TWD 10. Purpose of acquisition: Capital management 11. Dissenting opinions of directors: None 12. Related party transaction: No 13. Transaction counterparties: CITI, UBS (Switzerland), BNP 14. Audit Committee/Supervisor approval date: N/A 15. Date of previous announcement for the same event: N/A 16. Other notes: None