Chih Sheng Announces Material Financial Information Due to Meeting Taiwan Stock Exchange Trading Alert Criteria

1. Date of Event: June 23, 2026 (R.O.C. Year 115)

2. Reason for Announcement: In compliance with notification from the Taiwan Stock Exchange

3. Financial and Operational Information:

Period (Monthly) (Quarterly) (Last Four Quarters Cumulative) Most Recent Month vs. Most Recent Quarter vs. From Q2 2025 (R.O.C. 114) to Item May 2026 (R.O.C. 115) Prior Year % Change Q1 2026 (R.O.C. 115) Prior Year % Change Q1 2026 (R.O.C. 115) (IFRS-Consolidated Self-Verified Figures) (IFRS-Consolidated Audited Figures) (IFRS-Consolidated Audited Figures) ======== ========== ========== ========== ========== ============== Revenue 1,022 +75% 2,262 +73% 7,055 (NT$ million) Pre-tax Net Profit 316 +205% 614 +156% 1,501 (NT$ million) Net Profit Attributable to Owners of Parent 236 +170% 466 +210% 1,146 (NT$ million) Earnings Per Share 1.53 +164% 3.06 +206% 7.56 (NT$)

4. Whether there are material events under Article 4 of the 'Procedures for Verification and Disclosure of Material Information by Listed Companies' of the Taiwan Stock Exchange: No

5. Whether there is a material information press conference required under Article 11 of the same procedures: No

6. Complete financial information is available on the Public Information Observation System. Access paths: (1) Recent Revenue and Earnings: Basic Information > Highlights (2) Historical Monthly Revenue: Business Overview > Monthly Revenue > Monthly Revenue Information Post-IFRS Adoption (3) Historical Earnings (Audited/Reviewed Figures): Financial Statements > Post-IFRS Adoption > Consolidated/Individual Statements > Consolidated Statement of Comprehensive Income (4) Historical Earnings (Voluntary Self-Verified Announcements): Business Overview > Self-Verified Earnings Announcements

7. Other Matters to Be Disclosed: None