Sihwei Navigation Announces Financial Information Due to Trading Alert Threshold on Exchange

1. Date of Event: August 24, 2026 2. Reason: In compliance with instructions from the Taiwan Stock Exchange Corporation. 3. Financial and Business Information:

Period (Monthly) (Quarterly) (Last Four Quarters) (Self-compiled) (Reviewed) (Reviewed) (IFRS) (IFRS) (IFRS)

Most Recent Month YoY Change % Most Recent Quarter YoY Change % Last Four Quarters Item (July 2026) (Q2 2026) (Q3 2025 – Q2 2026)

Revenue 362 million NT$ 44% 853 million NT$ 11% 3,255 million NT$ Pre-tax Profit (Loss) 13 million NT$ 126% 143 million NT$ -48% -97 million NT$ Net Profit (Loss) Attributable to Owners of Parent 30 million NT$ 161% 165 million NT$ -24% 37 million NT$ Earnings Per Share 0.07 NT$ 158% 0.42 NT$ -25% 0.10 NT$

4. Whether any material information under Article 4 of the 'Procedures for Verification and Disclosure of Material Information by Listed Companies' of the Taiwan Stock Exchange Corporation applies: No 5. Whether a press conference under Article 11 of the same procedures is scheduled: No 6. Complete financial information 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 Overview > 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 Overview > Self-compiled Profit Announcement: None 7. Other Notes: The financial data for July 2026 is self-compiled and has not been audited or reviewed by accountants. It is provided for investors’ reference only.