【ESMT】Disclosure of Financial and Business Information Due to Company's Securities Reaching Alert Level on the Centralized Exchange Market

1. Date of occurrence: 2026/05/18 2. Reason for occurrence: The Company was notified by the Stock Exchange about unusual trading activity in its securities, and therefore, as instructed by the Stock Exchange, discloses the following information for investor reference. 3. Financial and Business Information: Period (Month) (Quarter) (Last Four Quarters Cumulative) Item: April 2026 (Consolidated Unaudited) YoY % | Q1 2026 (Consolidated Reviewed) YoY % | Q2 2025 to Q1 2026 (Consolidated Reviewed) Operating Revenue (Million): 4,634 / 349% | 7,267 / 150% | 18,939 Profit Before Tax (Million): 2,362 / 1,707% | 2,352 / 3,155% | 2,700 Net Profit Attributable to Parent (Million): 1,848 / 1,429% | 2,064 / 2,816% | 2,385 Earnings Per Share (NT$): 6.32 / 1,364% | 7.22 / 2,775% | 8.36 4. Is there any matter of material information as listed in Article 4 of the "Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Listed Companies" (If yes, please explain): No. 5. Is there any matter requiring a press conference as listed in Article 11 of the same procedures: No. 6. For complete financial information, please refer to the Market Observation Post System. 7. Other notes: None.