【Signal Tech-KY】Disclosure of Material Financial and Business Information Due to Reaching Cautionary Trading Information Disclosure Standards in the Centralized Securities Market

1. Date of occurrence of the event: 2026/04/20 2. Cause of occurrence: Handled in accordance with the notification from Taiwan Stock Exchange Corporation. 3. Financial and business information: Period (Month) (Quarter) (Last four quarters cumulative) Latest Month Year-on-year Latest Quarter Year-on-year Q1 2025 to Q4 2025 Item March 2026 Increase/Decrease% Q4 2025 Increase/Decrease% (Audited Consolidated IFRS) -------------------------------------------------------------------------------------------------------------------------------------- IFRS Consolidated Self-reported IFRS Consolidated Audited Operating Revenue 573.47 -25.39% 2,069.53 22.15% 7,531.93 (Millions) Pre-tax Net Profit -7.07 -146.45% 285.73 8,792.93% 250.05 (Millions) Net Profit attributable to Owners of Parent -43.34 -57.88% 95.21 208.60% 27.52 (Millions) Earnings Per Share -0.41 -57.55% 0.90 210.34% 0.26 (NT dollars) 4. Whether there is any material information listed in Article 4 of the "Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Listed Securities" (If "Yes", please explain): None. 5. Whether there is any press conference for explanation of material information listed in Article 11 of the "Taiwan Stock Exchange Corporation Procedures for Verification and Disclosure of Material Information of Listed Securities": None. 6. For complete financial information, please refer to the Market Observation Post System. Path as follows: (1) Recent revenue and profit/loss information: Basic Information > Essential Version (2) Historical monthly revenue: Operation Status > Monthly Revenue > Monthly Revenue Information after IFRSs adoption (3) Historical profit/loss (audited/reviewed by accountants): Financial Reports > After IFRSs adoption > Consolidated/Separate Reports > Comprehensive Income Statement (4) Historical profit/loss (self-reported voluntary disclosure): Operation Status > Self-reported Profit/Loss Disclosure: None. 7. Other matters that should be specified: None.