[Rainbow Yang-KY] Announces Financial Information Due to Securities Reaching Abnormal Trading Alert Criteria

1. Date of Event: July 7, 2026 (R.O.C. Year 115) 2. Reason: In accordance with notification from the Taiwan Stock Exchange Corporation. 3. Financial and Business Information:

Period Monthly Quarterly Last Four Quarters Cumulative =================================================================================== Latest Month YoY % Latest Quarter YoY % From Q2 2025 to Q1 2026 Item May 2026 Change Q1 2026 Change (Audited/Reviewed) (Consolidated 　　　 (Audited/ Self-Computed) Reviewed) =================================================================================== Operating 313 -19.74 177 -23.21 780 Revenue (NT$M) Pre-tax Net (50) 22.03 (31) 17.48 41 Income (NT$M) Net Income to (51) 20.85 (32) 17.32 28 Parent Owners (NT$M) EPS (NT$) (0.63) 21.25 (0.40) 16.67 0.35

4. Whether there are material events under Article 4 of the 'TSEC 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 > Summary (2) Historical monthly revenue: Operations > Monthly Revenue > Monthly Revenue under IFRS (3) Historical profit/loss (audited/reviewed): Financial Statements > Under IFRS > Consolidated/Individual > Comprehensive Income Statement (4) Historical profit/loss (voluntary self-computed): Operations > Self-Computed Profit Announcement: None 7. Other Disclosures: None