PegBio Co., Ltd. released its monthly return to Hong Kong Exchanges and Clearing Limited for the period ended 31 May 2026, confirming that there were no changes to its share capital structure during the month.

Registered Capital Structure • H-share tranche: 284.30 million ordinary shares at a par value of RMB 1.00 each, all listed on the Hong Kong Stock Exchange. • Unlisted domestic tranche: 106.79 million ordinary shares at the same par value. • Combined registered share capital: 391.09 million shares, unchanged from the preceding month.

Issued Shares and Public Float • Issued H-shares stood at 284.30 million, with zero treasury shares, indicating no share issuance, cancellation, or repurchase activities in May. • PegBio confirmed that its public float comfortably meets the Main Board’s minimum 25 % requirement, based on publicly available information.

Capital Instruments and Corporate Actions • The company reported no outstanding or new share options, warrants, convertibles, or other equity-linked agreements. • No Hong Kong Depositary Receipts are in circulation.

Administrative Details The filing, dated 3 June 2026, was signed by Joint Company Secretary Huang Yifeng, reaffirming compliance with all relevant Hong Kong Listing Rules.