Antengene Corporation Limited will convene its 2026 annual general meeting at 10:30 a.m. on 10 June 2026, offering both on-site participation at Suites 1206-1209, Block B, Zhongshan SOHO Plaza, Shanghai, and a live webcast option.

Key agenda items include:

1. 2025 Financial Statements and Audit Report Shareholders will vote on accepting the audited consolidated financial statements for the year ended 31 December 2025, along with the directors’ and auditor’s reports.

2. Board Composition and Remuneration Independent non-executive directors Ms. Jing Qian and Mr. Sheng Tang are standing for re-election. The board also seeks authority to set directors’ remuneration.

3. Auditor Re-appointment Ernst & Young is nominated for re-appointment as external auditor, with the board authorised to determine its fees.

4. General Issuance Mandate—Up to 20% of Issued Shares The board requests a mandate to allot, issue or deal in additional shares—excluding treasury shares—up to 20% of the company’s issued share capital as at the date of the AGM. The mandate would also cover the sale or transfer of any treasury shares and the grant of options, warrants or convertible instruments.

5. Share Repurchase Mandate—Up to 10% of Issued Shares A separate resolution seeks authority to repurchase up to 10% of issued shares (excluding treasury shares) on The Stock Exchange of Hong Kong Limited or other recognised exchanges.

6. Extension Mandate Subject to approval of the above two mandates, the aggregate number of shares repurchased under the buyback mandate may be added to the 20% issuance limit, effectively enlarging the issuance capacity by up to an additional 10%.

7. Adoption of New Memorandum and Articles A special resolution proposes amendments to the existing constitutional documents and adoption of a new amended and restated memorandum and articles of association.

Shareholder Logistics • Register of members will be closed from 5 June 2026 to 10 June 2026 inclusive; share transfers must be lodged by 4:30 p.m. on 4 June 2026 to qualify for attendance and voting. • The record date for voting entitlement is 10 June 2026. • Proxy forms must be deposited with Computershare Hong Kong Investor Services Limited no later than 48 hours before the meeting. • Shareholders joining via webcast will not count toward quorum and cannot vote online.

As of the notice date (29 April 2026), the board comprises Executive Directors Dr. Jay Mei (Chairman) and Mr. Donald Andrew Lung, and Independent Non-Executive Directors Dr. Rafael Fonseca, Ms. Jing Qian and Mr. Sheng Tang.