【Dongni】Announcement by Important Subsidiary Southeast Gaoliang Resource Recycling Co., Ltd. on Ex-Rights and Ex-Dividend Record Date

1. Date of Resolution by Board of Directors, Shareholders' Meeting or Company Decision: 2026/05/05 2. Type of Ex-Rights/Ex-Dividend (Please fill in "Ex-Rights", "Ex-Dividend" or "Ex-Rights and Ex-Dividend"): Ex-Rights and Ex-Dividend 3. Type and Amount of Dividends Distributed: Cash Dividend: NT$19,890,000 (NT$0.9 distributed per share). Stock Dividend: NT$39,780,000 (NT$1.8 distributed per share). 4. Ex-Rights (Ex-Dividend) Trading Date: NA 5. Last Date for Transfer Registration: 2026/05/08 6. Start Date for Suspension of Transfer Registration: 2026/05/09 7. End Date for Suspension of Transfer Registration: 2026/05/13 8. Ex-Rights (Ex-Dividend) Record Date: 2026/05/13 9. Other Matters to be Specified: Cash dividend payment date is 2026/05/25.