国泰海通｜金工：根据量化模型信号，9月建议超配小盘风格，均衡配置价值和成长风格

Group 1: Core Insights - The report suggests an overweight allocation to small-cap stocks for September, based on a quantitative model signal of 0.17 at the end of August, indicating a preference for small-cap style [1] - The long-term view remains optimistic for small-cap stocks, with the current market capitalization factor valuation spread at 1.01, which is still below the historical peak range of 1.7 to 2.6 [1] - Year-to-date, the small-cap rotation strategy has yielded a return of 28.19%, with an excess return of 4.24% compared to benchmarks like CSI 300 and CSI 2000 [1] Group 2: Value and Growth Style Rotation - The monthly quantitative model signal for value and growth style is 0, suggesting an equal-weight allocation for September [1] - The year-to-date return for the value and growth style rotation strategy is 14.33%, with an excess return of 1.35% relative to equal-weight benchmarks [1] Group 3: Factor Performance Tracking - Among eight major factors, volatility and large-cap factors showed positive returns in August, while liquidity and quality factors had negative returns [2] - Year-to-date, volatility and momentum factors have performed positively, whereas liquidity and large-cap factors have shown negative returns [2] - In August, beta, large-cap, and short-term reversal factors had positive returns, while profitability quality, seasonality, and liquidity factors had negative returns [2] Group 4: Factor Covariance Matrix Update - The report updates the stock covariance matrix, which is crucial for predicting portfolio risk, using a multi-factor model to combine factor covariance and stock-specific risk matrices [2]