中证1000指数上涨0.4%，前十大权重包含欧菲光等

Group 1 - The core index, the CSI 1000, has shown a recent upward trend, increasing by 1.31% over the past month, while it has decreased by 5.51% over the last three months and has risen by 3.42% year-to-date [1] - The CSI 1000 index consists of 1000 securities that are smaller in scale and have good liquidity, complementing other indices like the CSI 300 and CSI 500 [1] - The top ten weighted stocks in the CSI 1000 index include O-film Tech (0.61%), BeiGene (0.43%), and Hengxuan Technology (0.42%) among others [1] Group 2 - The industry composition of the CSI 1000 index shows that industrials account for 25.14%, information technology for 21.99%, and materials for 12.88%, with healthcare and communication services also represented [2] - The index samples are adjusted biannually, with changes implemented on the next trading day after the second Friday of June and December, typically not exceeding 10% of the sample [2] - Special circumstances may lead to temporary adjustments in the index, such as the delisting of a sample company or significant corporate actions like mergers [2]