3711 ASE Holding

Disclosure Date: June 26, 2026 Statement Date: June 25, 2026 Statement Time: 18:42:38 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary Silicon Precision Industries Co., Ltd. regarding board resolution to establish ex-dividend and ex-rights benchmark date. Applicable Clause: Clause 14 Factual Date: June 25, 2026 Details: 1. Date of board, shareholders' meeting resolution, or company decision: June 25, 2026 2. Type of ex-rights/dividend (please enter 'ex-rights', 'ex-dividend', or 'ex-rights-dividend'): ex-rights-dividend 3. Types and amounts of dividend distribution: Cash dividend for common shares: NT$14,700,000,000, equivalent to NT$2.161781 per common share. Stock dividend for common shares: NT$3,951,300,000, equivalent to NT$0.581078 per common share. 4. Ex-rights/dividend trading day: N/A 5. Last transfer date: N/A 6. Start date of transfer suspension: N/A 7. End date of transfer suspension: N/A 8. Ex-rights/dividend benchmark date: June 26, 2026 9. Other matters to be disclosed: None