Antengene Corporation Limited reported a minor adjustment to its share capital following an on-exchange repurchase executed on 21 September 2026. Key details are as follows:

• Transaction overview: The company bought back 5,000 ordinary shares on the Hong Kong Stock Exchange at prices ranging between HKD 3.31 and HKD 3.48, settling at a total consideration of HKD 17,200.

• Impact on share count: Issued shares outstanding (excluding treasury stock) decreased marginally by 0.0007 % to 687.50 million. Treasury shares held increased to 2.03 million, while the total issued share count remained unchanged at 689.54 million.

• Repurchase mandate utilisation: Since shareholders granted a buyback mandate on 10 June 2026 authorising repurchases of up to 67.92 million shares, Antengene has repurchased 1.83 million shares, equivalent to 0.27 % of the issued share base at the mandate date.

• Post-buyback restrictions: In line with Hong Kong listing regulations, the company is restricted from issuing new shares or selling treasury shares until 21 October 2026.

The board, represented by Chairman Dr. Jay Mei, confirmed that the transaction complied with Main Board Rule 10.06 and that no material changes have occurred to the previously issued explanatory statement dated 29 April 2026.