[Yongguang] Announcement of relevant major financial and business information due to its securities reaching the standard for announcing "Notice of Trading Information" in the centralized trading market, to facilitate investor distinction and understanding.

1. Date of occurrence: 04/20/2026. 2. Reason for occurrence: As notified by the Taiwan Stock Exchange Corporation. 3. Financial and business information:

Latest Month Year-on-Year Change Latest Quarter Year-on-Year Change Cumulative Last Four Quarters Self-Assessed vs. Previous Year Accountant Reviewed vs. Previous Year Accountant Audited (Feb 2026) (Q4 2025) (Q1 2025 ~ Q4 2025)

Operating Revenue (Millions) 484 -25% 1,835 -10% 7,569 Profit Before Tax (Millions) -21 -226% -60 -301% -173 Net Profit Attributable to Owners of Parent (Millions) -24 -180% -21 -147% -117 Earnings Per Share (NTD) -0.04 -180% -0.03 -138% -0.21

(Unit: Except for Earnings Per Share in NTD, all others are in NT$ million) 4. Whether there is any event listed in "Article 4 of the "Guidelines for Verification and Public Disclosure of Material Information of Listed Companies by the Taiwan Stock Exchange Corporation" (if "Yes", please explain): No. 5. Whether there is any press conference for "Explanation of Material Information" listed in "Article 11 of the "Guidelines for Verification and Public Disclosure of Material Information of Listed Companies by the Taiwan Stock Exchange Corporation": No. 6. For complete financial information, please refer to the "Information Disclosure and Transparency Gateway" (MOCA). Path: (1) Recent operating revenue and profit/loss information: Basic Information > Summary Version. (2) Historical monthly operating revenue: Operational Overview > Monthly Revenue > Monthly Revenue Information after adopting IFRSs. (3) Historical profit/loss (accountant audited/reviewed figures): Financial Statements > Post-IFRS Adoption > Consolidated/Separate Statements > Statement of Comprehensive Income. (4) Historical profit/loss (voluntary self-assessed figures): Operational Overview > Self-Assessed Profit/Loss Announcements. 7. Other matters to be noted: None.