【Hiwin Mikrosystem】The company's securities have reached the standard for public disclosure of attention-requiring trading information in the centralized trading market, thus announcing relevant significant financial and business information for investors' understanding.

1. Date of occurrence of the event: 2026/04/14 2. Cause of occurrence: In accordance with the instruction from Taiwan Stock Exchange Corporation. 3. Financial and business information: Most recent month YoY change Most recent quarter YoY change Accumulated for the most recent four quarters Period (February 2026) (Q4 2025) (Q1 2025 to Q4 2025) Item (IFRS-Consolidated (IFRS-Consolidated (IFRS-Consolidated Self-reported) Increase/Decrease % Audited/Reviewed) Increase/Decrease % Audited/Reviewed) ----------------------------------------------------------------------- Operating Revenue 255 22% 755 22% 2,714 (NT$ millions) Pre-tax Net Profit 40 29% 108 119% 301 (NT$ millions) Net Profit Attributable to Owners of the Parent 25 10% 90 174% 241 (NT$ millions) Earnings Per Share 0.21 10% 0.75 174% 2.01 (NT$) 4. Is there any material information as listed in Article 4 of the "Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Listed Securities" (if "Yes", please explain): No. 5. Is there any press conference for material information as listed in Article 11 of the "Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Listed Securities": No. 6. For complete financial information, please refer to the Market Observation System, paths as follows: (1) Recent operating revenue and profit/loss information: Basic Information > Highlights (2) Historical monthly operating revenue: Operating Overview > Monthly Revenue > Monthly Operating Revenue Information after IFRSs adoption (3) Historical profit/loss (audited/reviewed by accountants): Financial Statements > After IFRSs adoption > Consolidated/Individual Statements > Comprehensive Income Statement (4) Historical profit/loss (voluntary self-reported announcement): Operating Overview > Self-reported Profit/Loss Announcement: None 7. Other matters that need to be specified: The increase in profit in the most recent quarter compared to the same period last year was mainly due to increased revenue.