Sanchang Electric Wins CGA115016 'Next-Generation Radar System' Project from Ocean Affairs Council Coast Guard Administration

Announcement Date: July 2, 2026 Statement Date: July 1, 2026 Statement Time: 16:25:02 Company Code: 2427 Company Name: Sanchang Electric Subject: Awarded the Ocean Affairs Council Coast Guard Administration's CGA115016 'Next-Generation Radar System' Project Applicable Clause: Clause 51 Event Date: July 1, 2026

Details: 1. Event Date: July 1, 2026 2. Company Name: Sanchang Computer Co., Ltd. 3. Relationship with Company (enter '本公司' or 'subsidiary'):本公司 (This Company) 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: The company has been awarded the CGA115016 'Next-Generation Radar System' project by the Ocean Affairs Council Coast Guard Administration, with a contract value of NT$4,447,916,700 (inclusive of tax). 6. Response Measures: None 7. Other Matters to be Disclosed (If the entity involved in the event or resolution is a publicly issued company or above, this material information also meets the criteria under Article 7, Paragraph 9 of the Enforcement Rules of the Securities and Exchange Act, regarding matters significantly affecting shareholders' rights or securities prices): Client: Ocean Affairs Council Coast Guard Administration Project Location: Taiwan's main island and outlying islands Completion Deadline: From the day after contract award until December 31, 2035, including a 4-year construction phase (2026–2029), a 2-year warranty period (2030–2031), and a 4-year maintenance phase (2032–2035).