A股重要指数，调样在即

Group 1 - The core viewpoint of the news is the periodic adjustment of the sample stocks in the Sci-Tech Innovation Board indices, which enhances the representativeness of the indices and supports the development of new productivity in China [2][3]. - After the adjustment, the total market capitalization coverage of the Sci-Tech 50 Index and the Sci-Tech 100 Index over the entire Sci-Tech Board increased to 63%, up by 1.1% from before the adjustment [2]. - The adjustment allows for an orderly exchange of sample stocks between the Sci-Tech 50 Index and the Sci-Tech 100 Index, with the former incorporating stocks from the latter, thereby enhancing the representation of large and medium-cap securities on the Sci-Tech Board [3]. Group 2 - The Sci-Tech 50 Index saw an approximate 2% increase in the weight of the new generation information technology sector, while the Sci-Tech 100 Index experienced a 4% increase in sectors such as new materials and biomedicine [3]. - The Shanghai Stock Exchange is continuously improving its index system to enhance quality and diversity, which supports long-term capital inflow and aligns with national strategic goals [3]. - As of February 27, the Sci-Tech 50 Index, Sci-Tech 100 Index, and North Exchange 50 Index have recorded increases of 10.7%, 14.22%, and 6.71% respectively since the beginning of the year [5][6]. Group 3 - The adjustment of indices is part of a routine process, reflecting the ongoing trend of index-based investment in the A-share market, which is gaining momentum [7]. - The overall improvement in the quality of listed companies and the favorable economic conditions are seen as strong support for the development of domestic indices and index investment [7].