Group 1 - The article reports on share buybacks conducted by various companies on July 21, 2025, with China Eastern Airlines leading in both the number of shares repurchased and the total amount spent [1][2] - China Eastern Airlines repurchased 2.944 million shares for a total of HKD 8.5194 million, representing 1.915% of its total share capital for the year [2] - Other notable companies involved in the buyback include Mengniu Dairy, IGG, and Vitasoy, with varying amounts and percentages of their total share capital repurchased [1][2] Group 2 - Mengniu Dairy repurchased 200,000 shares for HKD 3.4207 million, accounting for 0.127% of its total share capital [2] - IGG repurchased 490,000 shares for HKD 2.1160 million, which is 0.617% of its total share capital [2] - Vitasoy repurchased 56,000 shares for HKD 0.5186 million, representing 1.363% of its total share capital [2]