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Sound Advice: July 2, 2025

What is the risk of investing in top-performing mutual funds? And why is recently great performance usually followed by poor performance?

Investing in top-performing mutual funds comes with several risks, and recent strong performance is often followed by weaker results due to well-documented market phenomena.

Risks of Investing in Top-Performing Mutual Funds

  • Mean Reversion: Mutual fund performance tends to revert to the mean over time. Funds that outperform their peers are likely to see their excess returns diminish as the factors or luck that drove their success fade. This means that investing in funds after a period of strong performance may expose you to disappointment as returns normalize. 
  • Herding and Overcrowding: When a fund achieves top performance, it often attracts large inflows from new investors. These inflows can force the fund to buy more of the same assets, potentially driving up prices and reducing future returns. As funds’ assets grow, they are increasingly burdened with the need to limit their investments to the largest companies.  For that reason, there is an increasing likelihood of duplication of holdings.  Indeed, investors who follow the largest funds may discover that 50% or more of the underlying holdings are duplications.  So much for thoughts of diversification.
  • Large funds also face increased trading costs and liquidity constraints, which can hurt performance.
  • Management and Style Changes: Top-performing funds may close to new investors or experience manager turnover, both of which can negatively impact future returns. Manager changes, in particular, have been shown to lead to underperformance, especially if the outgoing manager was skilled.
  • High Fees: Many top-performing funds charge higher fees, which can erode returns over time, especially as performance reverts to the mean.
  • Survivorship and Selection Bias: Only the funds that performed well are highlighted, while underperformers are often closed or merged away, giving a misleading impression of the overall likelihood of success.

Why Great Performance Is Often Followed by Poor Performance

  • Mean Reversion: This is the dominant explanation. Exceptional performance is often the result of a combination of skill and luck. Luck tends to even out over time, and even skilled managers may see their edge disappear as others catch on or market conditions change. Although a new investing wrinkle may prove to be successful temporarily, that edge will vanish as others catch on.
  • Flow-Performance Relationship: Strong recent performance attracts more investor money, which can make it harder for managers to deploy capital effectively, especially if the fund’s strategy is capacity-constrained.
  • Portfolio Imbalances: Funds that have outperformed may end up with portfolios heavily weighted in past winners. If these stocks revert to the mean, the fund’s performance will suffer.
  • Behavioral Biases: Investors and managers alike may overestimate the persistence of good performance, leading to overconfidence and poor decision-making.

In short, top-performing mutual funds are not a guarantee of future success. Investors should be cautious and consider the risks of mean reversion, overcrowding, and other factors that can turn yesterday’s winners into tomorrow’s disappointments.  

In most cases, yesterday’s winners will become tomorrow’s losers. Stick to ultra low cost index funds. They will be the leaders over time.

N. Russell Wayne

Weston, CT  06883

203-895-8877

www.soundasset.blogspot.com

 

 

  

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