Shanghai FourSemi Semiconductor Co., Ltd. (FOURSEMI) has issued a notice convening its 2025 Annual General Meeting (AGM) for 10:00 a.m. on 5 June 2026 at Room 106, Building 5, No. 2007 Hongmei Road, Xuhui District, Shanghai.

Key agenda items include:

1. Statutory Reports and Financial Matters • Review and approval of the 2025 Annual Report. • Consideration of the 2025 profit distribution plan. • Presentation of the Board of Directors’ 2025 work report and the duty report of independent non-executive directors.

2. Remuneration and Auditor Re-appointment • Approval of directors’ remuneration packages for 2025 and 2026. • Re-appointment of Ernst & Young as external auditor for 2026, with the Board authorised to determine related fees and agreements.

3. Shareholder Mandates (Special Resolutions) • Share buy-back mandate: authorisation for the Board (and, by delegation, the President) to repurchase up to 10% of FOURSEMI’s issued H shares (excluding any treasury shares) on the Hong Kong Stock Exchange or other recognised bourses during the mandate period, which runs until the earlier of: – the conclusion of the next AGM; – 12 months from the date of the forthcoming AGM; or – revocation/variation by shareholders. • General issuance mandate: authorisation for the Board to allot, issue, sell or transfer treasury shares representing up to 20% of issued share capital (excluding any treasury shares) within the same mandate period, subject to compliance with PRC law, the Articles of Association, Hong Kong Listing Rules and regulatory approvals. The mandate includes authority to amend the Articles to reflect any resulting changes in registered capital and to execute related documentation.

Administrative Details • The shareholder record date is 5 June 2026; the H-share register will be closed from 2–5 June 2026 (both days inclusive). • Proxy forms and related authorisations must be lodged by 10:00 a.m. on 4 June 2026.

Directors As of the notice date (14 May 2026), the Board comprises four executive directors—Xu Xiaolin (Chairman and President), Liu Baoliang, Qian Shun and Yu Bingbing; two non-executive directors—Chen Binglin and Lin Enfeng; and three independent non-executive directors—Liu Hongcan, Liu Liping and Dai Xueguang.