西部证券用隔夜交易策略增强指数增强

Core Conclusions - The report constructs a composite factor to predict overnight returns, and the designed overnight trading strategy shows robust excess returns, enhancing existing index enhancement strategies [8][12]. Factor Synthesis - A series of factors capable of predicting overnight returns were tested, and the synthetic factor effectively predicts overnight returns [12]. - The synthetic factor has a significant negative correlation with overnight returns, with a Rank IC of -0.1687 [12]. - By adding the overnight trading strategy to existing index replication, excess returns of 4%-7% can be achieved with a tracking error of approximately 1.2% [12]. - The existing index enhancement model combined with the overnight trading strategy can further increase excess returns by 2%-5% [12]. Overnight Returns and Single Factor Performance - The long-term overnight returns in the A-share market are negative, primarily due to the T+1 trading mechanism, which results in a cost that leads to higher closing prices than opening prices [19]. - The report provides statistical data on the historical returns of the CSI 300 and CSI 2000 indices from January 1, 2015, to December 31, 2025, highlighting the negative overnight returns [16]. Passive Index Enhancement Strategy - The report outlines a passive index enhancement strategy that involves selling stocks with the highest factor values and negative returns at the end of the trading day and repurchasing them at the next day's opening [74]. - The annualized excess return of this strategy is 4.66%, with a tracking error of 1.17% and a maximum excess drawdown of 0.49% [74]. Enhanced Index Enhancement - The report discusses the integration of various factors, including volume shock, intraday returns, amplitude, and liquidity, to enhance index strategies [56]. - The Rank IC for the combined factors is -0.112, indicating a relatively good monotonicity [56]. - The report also details the performance of IC-weighted composite factors, showing improved results in both the CSI 300 and CSI 500 pools [66][69].