Why 90% of Professional Fund Managers Lose to the S&P 500. Here's the One Strategy That Works

"The most uncomfortable fact in professional money management arrived courtesy of S&P Dow Jones Indices: 90% of active fund managers underperformed the S&P 500 over the last 15 years. These are people paid handsomely to beat a benchmark, and the overwhelming majority cannot. On a recent episode of the Money Guy Show titled Everyday Investors Are Beating Fund Managers (Copy Their Strategy), co-host Brian Preston argued that the solution for everyday investors is almost embarrassingly simple."

"Preston and his co-hosts trace the failure to the same behavioral traps that hurt retail investors: herding (being "greedy when others are greedy and fearful when others are fearful") and overconfidence about predicting near-term market moves. The data on investor psychology backs this up. The University of Michigan Consumer Sentiment Index currently sits at 53.3, a reading the FRED data labels as pessimistic/recessionary. The VIX swung from 13.47 on December 24, 2025 to 31.05 on March 27, 2026 before settling back to 17.87."

"The Money Guy crew uses an extreme historical case to make the point. The Dow Jones Industrial Average closed at 381 on September 3, 1929 and reached just 383 on November 23, 1954, a $2 gain over 25 years. Even in that bleak window, an investor consistently buying through the crash would have accumulated shares at deeply depressed prices and come out ahead of someone trying to time entries and exits."

"Preston's prescription is dollar-cost averaging into low-cost index funds. "If you can set it and forget it and always be buying, that's what I love about that strategy," he explained, framing it as a way to "start building wealth the right way, which is slow and steady.""

90% of active fund managers underperformed the S&P 500 over the last 15 years. The underperformance is linked to behavioral traps such as herding and overconfidence in predicting near-term market moves. Investor psychology data show pessimism and volatility swings, making timing both direction and magnitude difficult. A historical stress test using the Dow Jones Industrial Average from 1929 to 1954 shows minimal index gains over 25 years, yet consistent buying through the crash would accumulate shares at depressed prices. Dollar-cost averaging into low-cost index funds is presented as a practical solution because it keeps buying continuously and reduces reliance on market timing.

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