Group 1 - On September 18, 26 Hong Kong-listed companies conducted share buybacks, totaling 10.65 million shares and an amount of HKD 636 million [1][2] - Tencent Holdings led the buybacks with 848,000 shares repurchased for HKD 550 million, with a year-to-date total of HKD 53.26 billion [1][2] - Other notable buybacks included Hang Seng Bank with 200,000 shares for HKD 23.8 million and MGM China with 1.2 million shares for HKD 18.76 million [1][2] Group 2 - The highest buyback amount on September 18 was from Tencent Holdings at HKD 550 million, followed by Hang Seng Bank at HKD 23.8 million [1][2] - In terms of share quantity, the most shares repurchased were by Lianyi Technology-W with 2.28 million shares, followed by China International Marine Containers and Coolpad Group [1][2] - The year-to-date buyback amounts for other companies included HKD 816.3 million for Hang Seng Bank and HKD 37.19 million for MGM China [1][2]