Hung Hsu-KY Announces Major Financial Information Due to Trading Threshold Breach

1. Event Date: July 2, 2026 2. Reason: In accordance with notification from the Taiwan Stock Exchange Corporation. 3. Financial and Business Information:

Most Recent Month YoY Change Most Recent Quarter YoY Change Last Four Quarters (Self-compiled, May 2026) % (Reviewed, Q1 2026) % (Audited/Reviewed, Q2 2025–Q1 2026) Revenue (NT$M) 91 17% 558 179% 2,098 Pre-tax Profit (NT$M) 5 145% 41 187% 177 Net Profit (NT$M) 4 136% 46 209% 173 EPS (NT$) 0.06 138% 0.66 208% 2.49

4. Whether any material information under Article 4 of the TWSE's 'Procedures for Verification and Disclosure of Material Information by Listed Companies' applies: No. 5. Whether a press conference under Article 11 of the above procedures is scheduled: No. 6. Complete financial data is available on the Public Information Observation Station via the following paths: (1) Recent revenue and profit: Basic Information > Highlights (2) Historical monthly revenue: Operations > Monthly Revenue > Monthly Revenue Information (Post-IFRS) (3) Historical profit/loss (audited/reviewed): Financial Statements > Post-IFRS > Consolidated/Individual > Comprehensive Income Statement (4) Historical profit/loss (voluntary self-compiled): Operations > Self-Compiled Earnings Announcement

7. Additional Notes: The above financial data for May 2026 and year-on-year comparisons are self-compiled consolidated figures prepared by the company under IFRS accounting standards. These figures have not been audited or reviewed by accountants and are provided solely for investors' reference.