[PSMC] Announcement of the Company's Self-Assessed Consolidated Profit/Loss for Q1 2026

1. Date of occurrence of the event: 2026/04/21 2. Company name: Powerchip Semiconductor Manufacturing Corporation 3. Relationship to the Company (please enter "head office" or "subsidiary"): Head office 4. Reciprocal shareholding ratios: N/A 5. Cause of occurrence: Announcement of the Company's self-assessed consolidated profit/loss for Q1 2026: (Unit: NT$ thousands) Jan-Mar 2026 -------------- Consolidated Net Operating Revenue: 13,572,462 Consolidated Gross Profit (Loss): 1,388,213 Consolidated Operating Income (Loss): 14,226,108 Consolidated Income (Loss) Before Tax: 14,331,913 Consolidated Net Income (Loss): 14,231,209 Basic Earnings (Loss) Per Share (NT$): 3.36 6. Countermeasures: None 7. Any other matters that need to be specified: The above information is based on the Company's self-assessed figures and has not been reviewed by CPAs.