Group 1 - The core announcement is the semi-annual review results of the China Securities Index Co., Ltd. and Hang Seng Index Company regarding the CSI Hang Seng Stock Connect AH Index as of December 31, 2025 [1] - The adjustments involve the inclusion and exclusion of constituent stocks to better reflect the market performance and structural changes of listed companies in both regions [3] - The total number of constituent stocks in the index remains unchanged at 50 [6] Group 2 - Two new constituent stocks are added: SANY Heavy Industry Co., Ltd. (600031.SH, 06031) and Seres Group Co., Ltd. (601127.SH, 09927) [4] - The stocks being removed from the index are China Eastern Airlines Corporation Limited (600115.SH, 00670) and Tsingtao Brewery Group Co., Ltd. (600600.SH, 00168) [4] - The inclusion of Seres, a representative company in the new energy vehicle sector, highlights its increasing activity and influence in the A+H share market, reflecting the index's focus on emerging high-growth industries [6] Group 3 - The specific share categories (A-shares or H-shares) for the newly included companies will be finalized by March 2026, ensuring the representativeness and investability of the index [8] - The update of the index constituents is a routine reflection of market dynamics, optimizing the industry structure to better represent vibrant and potential listed companies under the Stock Connect mechanism [10]