翻倍基批量涌现，能持续吗？

Group 1 - The core viewpoint of the article is that the strong performance of equity funds in the past year has returned, with 85 funds achieving over 100% returns in 2025, including 74 active equity funds and 11 index funds and ETFs [4][5] - The article emphasizes that historical performance is not indicative of future results, and the focus should be on the sustainability of such high returns [6][24] - The best-performing funds in 2025 concentrated their investments in the top-performing sectors, particularly telecommunications and metals, which saw returns exceeding 80% [10][11] Group 2 - The article discusses the "champion curse" in mutual funds, indicating that historically, top-performing funds often struggle to maintain their performance in subsequent years [25][28] - Data shows that very few funds that ranked in the top quartile in one year continue to do so over the next five years, highlighting the difficulty of sustaining high performance [27][30] - The analysis includes both active and passive funds, revealing that even top-performing ETFs and index funds face challenges in maintaining their leading positions over time [33][36] Group 3 - The article presents statistical evidence that the probability of a fund maintaining its top quartile ranking from one year to the next is around 30%, which is only slightly better than random chance [39][41] - It notes that poor past performance is often a predictor of continued underperformance, while good past performance does not guarantee future success [43][46] - The article concludes that the concentrated investment strategies that lead to extreme performance are risky, as they rely on accurately predicting market trends, which is challenging even for professional investors [49][51]