国泰海通｜金工：综合量化模型和日历效应，8月大概率小市值风格占优、价值风格占优

Group 1: Market Strategy Insights - The report indicates that small-cap stocks are likely to outperform in August, supported by a quantitative model signal of 0.5, suggesting an overweight position in small-cap stocks [1] - Year-to-date, the small-cap strategy has yielded a return of 15.74%, outperforming the equal-weight benchmark return of 11.79% by 3.95% [1] - The value-growth rotation strategy shows a quantitative model signal of -0.33, indicating a shift towards value stocks, with a year-to-date return of 11.11% and an excess return of 7.63% [2] Group 2: Factor Performance Tracking - Among eight major factors, volatility and value factors have shown positive returns this month, while liquidity and momentum factors have shown negative returns [2] - Year-to-date, volatility and quality factors have performed well, whereas liquidity and large-cap factors have underperformed [2] - The report highlights that the beta, investment quality, and momentum factors have positive returns this month, while residual volatility, mid-cap, and long-term reversal factors have negative returns [2] Group 3: Covariance Matrix Update - The report updates the factor covariance matrix as of July 31, 2025, which is crucial for predicting stock portfolio risks [3] - The covariance matrix is constructed using a multi-factor model that combines factor covariance and stock-specific risk matrices for accurate estimation [3]