[Yih Tai] Announcement regarding the Company's derivative financial product transaction reaching the 10% loss limit of a single contract

1. Type of contract: Futures 2. Date of occurrence of the event: 2026/5/13 3. Contract amount: USD 10,237,822 4. Amount of margin paid or premium: USD -1,149,813.92 5. Loss limit for all or individual contracts as stipulated in the procedures: The loss amount for individual contracts shall not exceed 10% of the contract amount 6. Reason for engaging in derivative product transactions: For hedging purposes 7. Hedged item: Copper plates 8. Amount of hedged item position: USD 10,237,822 9. Profit and loss status of hedged item: Unrealized loss of USD 1,026,178 10. Loss amount based on fair value assessment (including realized and unrealized): Unrealized loss of USD 1,026,178 11. Cause of loss and its impact on the company: Valuation loss arising from the continuous rise in international copper prices. A price difference already exists between the hedged contract underlying asset and the hedging position, so this short-term valuation has no significant impact on the company's actual operations. 12. Contract period: 2026/02/13~2026/06/17 13. Restrictions: None 14. Other important agreements: None 15. Other matters to be specified: None.