Seres Group Co., Ltd. disclosed in its Next Day Disclosure Return (dated 9 June 2026) that it has continued its on-market A-share buy-back programme, with the latest transaction executed on 9 June 2026 through the Shanghai Stock Exchange.

Key details of the 9 June 2026 repurchase • Volume: 348,700 A-shares, earmarked for cancellation • Price range: RMB 71.53 – RMB 72.00 per share • Aggregate consideration: RMB 25.02 million

Cumulative repurchases awaiting cancellation Including the latest transaction, Seres Group now holds 2,665,170 A-shares pending cancellation, acquired across four separate trading dates: • 24 Apr 2026: 550,600 shares at an average RMB 90.76 • 08 May 2026: 1,097,670 shares at an average RMB 90.42 • 05 Jun 2026: 668,200 shares at an average RMB 75.89 • 09 Jun 2026: 348,700 shares at an average RMB 71.75

These shares represent approximately 0.16 % of Seres Group’s current issued share capital of 1,633,366,086 A-shares. No treasury shares are held.

Share capital position • Opening and closing issued share capital (excluding treasury shares) as of 9 June 2026: 1,633,366,086 shares • No new shares were issued during the period under review.

The disclosure was filed by Joint Company Secretary Shen Wei in compliance with Hong Kong Stock Exchange Main Board Rule 13.25A and Rule 10.06(4)(a), reflecting the company’s ongoing efforts to optimise its capital structure through share repurchases.