Antengene Corporation Limited (Antengene) has filed its Monthly Return for Equity Issuer for the period ended 30 April 2026, confirming a stable share structure and compliance with Hong Kong’s public-float rules.

Authorised and Issued Share Capital • Authorised capital remained unchanged at 2.00 billion ordinary shares with a par value of USD 0.0001, equivalent to USD 0.20 million. • Issued shares (excluding treasury) held steady at 679.24 million, while treasury shares were unchanged at 0.20 million. Total issued shares therefore stayed at 679.45 million. • No new shares were issued, cancelled or repurchased during the month, keeping total equity outstanding unchanged.

Public Float • Antengene confirmed that it continues to meet the Main Board’s minimum public-float requirement of 25% of issued shares.

Incentive Schemes Activity • 2019 Equity Incentive Plan: 10,000 options were cancelled; outstanding options stood at 12.28 million. • 2020 Equity Incentive Plan: 1.90 million options were granted, 111,000 lapsed and 69,500 were exercised via transfer of existing shares, bringing outstanding options to 23.49 million. • 2022 Restricted Share Unit Scheme: 250,000 RSUs were granted (to be settled with previously issued shares); 17,022 RSUs lapsed. Outstanding RSUs comprise 1.41 million units that may result in new share issuance and 0.25 million to be settled with existing shares. • Combined, the 2020 Option Plan and 2022 RSU Scheme allow for up to 54.18 million shares to be issued upon future exercises or vesting.

Other Instruments • No warrants, convertible securities, Hong Kong Depositary Receipts, or other share-linked instruments were outstanding or issued during the month.

Certification The return was signed by Chairman Dr. Jay Mei and submitted to Hong Kong Exchanges and Clearing Limited on 7 May 2026.