指数调仓，对我们投资有啥影响呢？｜第390期精品课程

Core Viewpoint - Index rebalancing is a process that ensures the vitality of indices by removing stocks that do not meet criteria and adding new ones, which can lead to changes in stock valuations and investor strategies [3][5][6]. Group 1: Index Rebalancing Process - Index rebalancing is akin to a metabolic process, ensuring that indices remain representative and investable [4]. - There are two main types of index rebalancing: temporary adjustments due to special events and regular adjustments based on sample stability [7][9]. - Regular rebalancing occurs at different frequencies, such as quarterly, semi-annually, or annually, depending on the index [14][15]. Group 2: Impact on Valuations - The recent rebalancing on June 13 affected various indices, with changes in the number of stocks and their average price-to-earnings (P/E) and price-to-book (P/B) ratios [20][18]. - For instance, the Shanghai-Shenzhen 300 Index saw a decrease in P/E and a slight increase in P/B after adjusting 7 stocks [23]. - The CSI 500 Index experienced an increase in both P/E and P/B after replacing 50 stocks [24]. Group 3: Strategy Indices - Strategy indices, such as the CSI A500 and value strategies, often see different valuation impacts compared to market-cap weighted indices [30][32]. - The CSI A500 Index's recent rebalancing led to a decrease in P/E and a slight increase in P/B [31]. - The 300 Value Index typically sees a decrease in valuation metrics due to its focus on low P/E and P/B stocks [32]. Group 4: Market Behavior and Investor Strategies - Market-cap weighted indices can lead to a "buy high, sell low" scenario, as stocks that rise in value are included while those that fall are excluded [43]. - This phenomenon has historical precedence in markets like the U.S. during the tech bubble, where high-flying stocks were included in indices, leading to greater declines when the bubble burst [45]. - To mitigate these effects, investors may consider strategy indices that do not rely on market capitalization, thus avoiding the pitfalls of chasing high valuations [47][51].