[Unimicron] Announcement of Trading Information for 1st Unsecured Convertible Bond (30371)

1. Date of occurrence: 2026/04/27 2. Reason: Compliance with the notice from the Taipei Exchange for material information. 3. Corporate bond information: - Maturity Date: 2030/11/03 - Actual total issuance: 4,000,000,000 TWD - Outstanding balance this month: 1,663,700,000 TWD (unconverted amount as of 2026/04/24) - Latest conversion price: 164.1 TWD - Closing price of the underlying stock (3037): 839 TWD (closing price on 2026/04/27) - Closing price of the convertible bond (30371): 508 TWD (closing price on 2026/04/27) 4. Other matters: None