[Major] Announcement regarding factory construction by subsidiary Dingmei Light Alloy Technology Vietnam Co., Ltd.

1. Type of contract: Land lease and factory construction agreement. 2. Date of occurrence: June 5, 2026. 3. Board approval date: Not applicable. 4. Other authorization: Chairman authorization. 5. Counterparty and relationship: ALC Construction Joint Stock Company; non-related party. 6. Main content: Structural construction for a new factory. Total contract value: 432,788,180,000 VND, approximately NT$516,749,000. Term: From the date of contract signing until the completion of contractual obligations. 7. Valuation results: Not applicable. 8. Purpose: Factory construction. 9. Related party transaction: No.