Nan Ya PCB Announces Financial Information Due to Trading Alert Threshold on Exchange

1. Date of Event: June 29, 2026 (R.O.C. Year 115) 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 Cumulative (May 2026) (Q1 2026) (Q2 2025 – Q1 2026) --------------------------------------------------------------------------------------------- Revenue (NT$ million) 4,440 35.82% 11,177 32.15% 42,892 Pre-tax Net Profit 977 - 1,598 523.95% 3,688 Net Profit Attributable 781 - 1,309 530.75% 3,048 to Parent Owners Earnings Per Share (NT$) 1.21 - 2.03 534.38% 4.72

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 required: No 6. Complete financial information is available on the Public Information Observation System via the following paths: (1) Recent operating revenue and profit/loss: Basic Information > Highlights (2) Historical monthly revenue: Operations Overview > Monthly Revenue > Monthly Revenue Information under IFRS (3) Historical profit/loss (audited/reviewed): Financial Statements > Under IFRS > Consolidated/Individual > Consolidated Statement of Comprehensive Income (4) Historical profit/loss (voluntary self-compiled data): Operations Overview > Self-Compiled Earnings Announcement: None 7. Other Matters to be Disclosed: None