Group 1 - The Hang Seng Index (HSI) will expand from 88 to 90 constituent stocks, adding CATL, Luoyang Molybdenum, and Laopuhuang Gold, while removing Zhongsheng Holdings [3][4] - Laopuhuang Gold will be classified under "Consumer Discretionary and Staples," with an initial weight of approximately 0.29%, while Alibaba's weight will return to 8% after adjustments [3] - The overall weight of the "Energy, Materials, Industrial, and Conglomerates" sector will increase from 10.03% to 10.90% due to the inclusion of CATL and Luoyang Molybdenum [4] Group 2 - The Hang Seng Composite Index will grow from 507 to 532 stocks, adding 53 new stocks including Woan Robotics and JD Industrial, while removing 28 stocks [6] - The recent sell-off of tech stocks has affected the Hong Kong market, with major players like Tencent and Alibaba experiencing significant declines in Q4 2025, necessitating a rebalancing of their weights [4][8] - The adjustment reflects a structural change in the Hong Kong market, reducing reliance on traditional financial and real estate sectors while increasing exposure to new economy and high-end manufacturing [8]