Hong Yang-KY: Disclosure of Major Financial Information Due to Reaching Attention Trading Criteria on the Centralized Market

1.Date of occurrence: June 4, 2026 2.Reason: Pursuant to notification from Taiwan Stock Exchange Corporation. 3.Financial and business information:

Period Monthly Quarterly Latest Four Quarters Cumulative ============ ============= ========= ============= ========= ================= Latest Month YoY% Latest Quarter YoY% 114 Q2 to 115 Q1 Item April 2026 115 Q1 (Audited/Reviewed) (Consolidated Self-Filed) (Reviewed/Audited) ============ ============= ========= ============= ========= ================= Revenue 241 -22.30 177 -23.21 780 (NT$ million) Pre-tax Profit (42) 11.28 (31) 17.48 41 (NT$ million) Net Profit (43) 10.46 (32) 17.32 28 Attributable to Parent (NT$ million) EPS (0.53) 10.17 (0.40) 16.67 0.35 (NT$ per share)

4.Whether there is any material information as listed in Article 4 of the "Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Listed Companies" (if yes, please explain): No 5.Whether there is any press conference for material information as listed in Article 11 of the same procedures: No 6.Complete financial information is available on the Market Observation Post System (MOPS) at the following paths: (1)Recent revenue and profit information: Basic Information > Highlights (2)Historical monthly revenue: Operational Overview > Monthly Revenue > Monthly Revenue Information After Adopting IFRSs (3)Historical profit/loss (auditor-reviewed/audited): Financial Statements > After Adopting IFRSs > Consolidated/Individual Statements > Comprehensive Income Statement (4)Historical profit/loss (voluntarily disclosed self-filed figures): Operational Overview > Self-filed Profit/Loss Announcement: None 7.Other matters requiring statement: None