Notice Regarding the Ex-Dividend Record Date for the 114th Fiscal Year Cash Dividend of Important Subsidiary SUNON INTERNATIONAL LIMITED

Announcement Date: May 20, 2026 Announcement Time: 18:00:17 Company Code: 2421 Company Name: Sunonwealth (SUNON)

Subject: Announcement of the ex-dividend record date for the 114th fiscal year cash dividend of our important subsidiary, SUNON INTERNATIONAL LIMITED.

Relevant Clause: Clause 14 Fact Occurrence Date: May 19, 2026

Explanation: 1. Date of Board of Directors' resolution or company decision: May 19, 2026 2. Type of Ex-rights/Ex-dividend: Ex-dividend 3. Type and amount of dividends: Cash dividend, total of 170,000,000 RMB 4. Ex-rights (dividend) trading date: N/A 5. Last transfer date: N/A 6. Stop transfer period start date: N/A 7. Stop transfer period end date: N/A 8. Ex-rights (dividend) record date: June 25, 2026 9. Other items: Cash dividends will be paid in June (94,000,000 RMB) and December (76,000,000 RMB). The distribution date will be determined by the Board of Directors.