Teng Hui Electronics-KY Announces Financial Information Due to Trading Volume Triggering Public Disclosure Threshold

1. Date of Event: June 26, 2026 2. Reason: In compliance with notification from the Taiwan Stock Exchange Corporation 3. Financial and Business Information:

Period (Monthly) (Quarterly) (Last Four Quarters Cumulative) Latest Month YoY Change% Latest Quarter YoY Change% Q2 2025 to Q1 2026 Item May 2026 (Consolidated Q1 2026 (Consolidated (Consolidated (NT$M) Self-Calc.) (NT$M) Reviewed) Reviewed) ======================================================================================== Revenue 530 34.96% 1,246 21.86% 4,488 Pre-tax Net 77 187.75% 148 51.61% 455 Income (NT$M) Net Income 71 128.21% 124 64.98% 395 (NT$M) EPS (NT$) 0.87 102.33% 1.73 64.76% 5.52

4. Whether there is any material information under Article 4 of the TWSE's Procedures for Verification and Disclosure of Material Information by Listed Companies: No 5. Whether a press conference under Article 11 of the same procedures is required: No 6. Complete financial data is available on the Public Information Observation System via the following 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 (audited/reviewed): Financial Statements > Under IFRS > Consolidated/Individual > Consolidated Statement of Comprehensive Income (4) Historical profit (voluntary self-calculation): Operations Overview > Self-Reported Profit Announcement: None 7. Other Disclosures: None