Group 1 - On December 18, 60 Hong Kong-listed companies conducted share buybacks, totaling 49.5262 million shares and an aggregate amount of HKD 1.122 billion [1][2] - Tencent Holdings repurchased 1.055 million shares for HKD 636.47 million, with a year-to-date total buyback amount of HKD 75.587 billion [1][2] - Xiaomi Group-W repurchased 3.75 million shares for HKD 151.06 million, with a year-to-date total buyback amount of HKD 5.388 billion [1][2] - China COSCO Shipping Holdings repurchased 5.90 million shares for HKD 80.5574 million, with a year-to-date total buyback amount of HKD 6.615 billion [1][2] Group 2 - The highest buyback amount on December 18 was from Tencent Holdings at HKD 636.47 million, followed by Xiaomi Group-W at HKD 151.06 million [1][2] - The largest number of shares repurchased on December 18 was by Anton Oilfield Services, with a buyback of 11.936 million shares [1][2] - Other notable buybacks in terms of share quantity included China COSCO Shipping Holdings and Xiaomi Group-W, with 5.90 million and 3.75 million shares repurchased, respectively [1][2]