[CSTI] Announcement Regarding Dividend Distribution for 2025 by Important Subsidiary Hotaidi Co., Ltd. - Ex-Dividend Registration Date and Payment Date

1. Date of Board of Directors, Shareholders' Meeting Resolution, or Company Decision: 115/06/11 2. Type of Rights Offering (Please fill in "Rights Offering", "Dividend Offering", or "Rights and Dividend Offering"): Dividend Offering 3. Type and Amount of Dividend Distributed: Cash dividend of NT$3,338,081,391 (approximately NT$1.10132682 per share) 4. Ex-Rights Trading Date: NA 5. Last Transfer Date: NA 6. Start Date of Transfer Suspension: NA 7. End Date of Transfer Suspension: NA 8. Ex-Dividend Registration Date: 115/06/18 9. Other Matters to be Noted: As the company is a single corporate shareholder, the provisions of the ex-dividend registration date do not apply. The cash dividend payment date for Hotaidi Co., Ltd. is 115/08/19.