4566 Shishuo Industrial

Announcement Date: June 26, 2026 Statement Date: June 25, 2026 Statement Time: 13:40:07 Company Code: 4566 Company Name: Shishuo Industrial Co., Ltd. Subject: Second Actual Issuance of Restricted Employee Stock Rights for 2025 Applicable Clause: Item 51 Factual Date: June 25, 2026

Details: 1. Factual Date: 06/25/2026 2. Company Name: Shishuo Industrial Co., Ltd. 3. Relationship with Company (enter '本公司' or 'subsidiary'):本公司 (本公司) 4. Cross-shareholding Ratio: Not applicable 5. Reason for Event: (1) The board of directors on May 11, 2026, resolved to approve the second issuance of restricted employee stock rights for 2025, including a list of grantees and 357,000 shares, with an issue price of TWD 33.60 per share, and set June 25, 2026, as the capital increase benchmark date. (2) The actual number of shares paid by eligible employees was 290,000, with a total payment amount of TWD 9,744,000. 6. Response Measures: The second actual issuance of the '2025 Restricted Employee Stock Rights Plan' is approved as 290,000 shares. The 67,000 shares not issued may be issued in the future according to the company's actual needs, following the issuance rules and procedures. 7. Other Matters to be Disclosed (If the subject is a publicly listed company or above, this major information also qualifies as a matter under Article 7, Paragraph 9, Item 9 of the Enforcement Rules of the Securities and Exchange Act that significantly affects shareholders' rights or securities prices): Please refer to the major information announcement dated May 11, 2026.