上证报：投资者在指数调整的重要时段需关注指数基金对市场的扰动

Group 1 - The explosive growth of index funds is leading to increased interaction between index funds and the market, which will become a regular issue for investors to face [1] - Investors need to pay attention to the disturbances caused by index funds during important periods of index adjustments [1] - The stock price of Cambrian, a bellwether for the Sci-Tech Innovation Board, experienced significant volatility, dropping over 14% on September 4 [1] Group 2 - The adjustment of the weight of sample stocks in the Sci-Tech 50 Index is considered a key factor influencing the stock price fluctuations of Cambrian [1] - The impact of index funds on the stock prices of listed companies has become increasingly significant due to the explosive growth of index funds over the past two years [1] - As index funds develop, the scale of individual ETFs continues to grow, enhancing their influence [1] Group 3 - As of September 12, there are 56 ETFs with a scale exceeding 100 billion, compared to only 44 such ETFs at the end of last year [1]