Walsin Technology Announces Financial Information Due to Securities Reaching Monitoring Threshold on Exchange

1. Date of Event: June 22, 2026

2. Reason for Announcement: In accordance with instructions from the Taiwan Stock Exchange Corporation

3. Financial and Business Information:

Monthly Quarterly Last Four Quarters ========= ================== ================== ================== Latest Year-over-Year Latest Year-over-Year Cumulative from Item Month Change (%) Quarter Change (%) 2nd Qtr 2025 to May 2026 (vs. Same Month) Q1 2026 (vs. Same Quarter) Q1 2026 (Consolidated (Consolidated (Consolidated (Consolidated (Consolidated Preliminary) Audit Data) Preliminary) Audit Data) Audit Data) ========= ================== ================== ================== Revenue 3,700 16.50% 9,538 9.13% 37,261 (NT$ million) Pre-tax Net 581 220.54% 1,437 50.16% 4,204 Profit (NT$ million) Net Profit 427 199.30% 820 40.17% 2,533 Attributable to Owners of Parent (NT$ million) Earnings per 0.88 198.88% 1.69 39.67% 5.22 Share (NT$)

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

5. Whether there is any scheduled press conference under Article 11 of the above procedures: No

6. Complete financial information is available on the Public Information Observation Station. Access paths: (1) Recent revenue and profit: Basic Information > Highlights (2) Historical monthly revenue: Operations Overview > Monthly Revenue > Monthly Revenue Information under IFRS (3) Historical profit and loss (audited/reviewed data): Financial Statements > Under IFRS > Consolidated/Individual > Comprehensive Income Statement (4) Historical profit and loss (voluntary preliminary data): Operations Overview > Preliminary Earnings Announcement

7. Other Matters to Note: None