3023 Sunyen: Correction Notice on Pre-Tax Net Profit Triggered by TWSE Trading Alert Criteria

Release Date: July 4, 2024 Statement Date: July 3, 2024 Statement Time: 17:57:09 Company Code: 3023 Company Name: Sunyen Subject: Correction - Due to the company's securities reaching the Taiwan Stock Exchange's threshold for public alert information (correction of pre-tax net profit) Applicable Clause: Clause 51 Factual Date: July 3, 2024

Details: 1. Factual Date: 07/03/2024 2. Reason: Announcement required per notification from Taiwan Stock Exchange Corporation 3. Financial and Business Information:

Period (Monthly) (Quarterly) (Last Four Quarters) ================ ===================== ====================== ============= Item Latest Month YoY Change Latest Quarter YoY Change Q2 2025 to Q1 2024 May 2024 (NT$M) (%) Q1 2025 (NT$M) (%) Consolidated Review ================ ===================== ====================== ============= Revenue 3,011 18 8,293 2 31,158 Pre-Tax Net Profit 320 21 1,116 -9 3,847 Net Profit Attributable to Owners of Parent 247 25 865 -6 3,066 EPS (NT$) 1.03 24 3.60 -6 12.77

4. Whether there is any material information under Article 4 of the 'TSEC Procedures for Verification and Disclosure of Material Information by Listed Companies': No. 5. Whether there is any press conference scheduled under Article 11 of the same procedures: No. 6. Complete financial information is available on the Public Information Observation Station. Access paths: (1) Recent Revenue and Earnings: Basic Information > Highlights (2) Historical Monthly Revenue: Operations > Monthly Revenue > Monthly Revenue under IFRS (3) Historical Earnings (Audited/Reviewed): Financial Statements > Under IFRS > Consolidated/Individual > Comprehensive Income Statement (4) Historical Earnings (Voluntary Self-Reported): Operations > Self-Reported Earnings

7. Other Matters to be Disclosed: None.