量化选股策略周报：本周指增超额止跌反弹-20250927

Core Insights - The report highlights a rebound in excess returns for index-enhanced strategies, indicating a positive shift in market performance [1] - The analysis is based on a deep learning framework that constructs alpha and risk models to create low-frequency index-enhanced strategies [4] Market Index Performance - As of September 26, 2025, the Shanghai Composite Index rose by 0.21%, the Shenzhen Component Index increased by 1.06%, and the CSI 300 Index gained 1.07%, with the STAR 50 showing strong performance [6][9] - The performance of index-enhanced funds for the week ending September 26, 2025, showed the CSI 300 index-enhanced fund had an excess return ranging from -1.59% to 0.86%, while the CSI 500 and CSI 1000 index-enhanced funds had similar ranges [6][14] Index Enhanced Fund Performance - Year-to-date, the CSI 300 index has increased by 15.6%, while the CSI 300 index-enhanced portfolio has risen by 22.8%, resulting in an excess return of 7.2% [6][22] - The CSI 500 index has seen a year-to-date increase of 26.5%, with its enhanced portfolio rising by 29.8%, yielding an excess return of 3.3% [6][27] - The CSI 1000 index has increased by 24.2% year-to-date, while its enhanced portfolio has risen by 35.1%, resulting in an excess return of 10.9% [6][33] Tracking Portfolio Performance - The report emphasizes the construction of index-enhanced portfolios for the CSI 300, CSI 500, and CSI 1000 using a deep learning framework, which optimizes alpha signals and risk signals [18] - The CSI 300 index-enhanced portfolio has shown a year-to-date return of 22.8%, outperforming the index itself [22][23] - The CSI 500 index-enhanced portfolio has achieved a year-to-date return of 29.8%, while the CSI 1000 index-enhanced portfolio has returned 35.1% [27][33]