The managers running the biggest active funds picked stocks that beat the market in 2025 — and most still lagged their benchmark. A Morningstar do-nothing experiment and a body of academic research explain why active funds underperform even when the picking is good: skilled buying undone by poor selling, the hidden cost of trading, and the incentives that keep managers churning. The UK evidence points the same way.
Picture this: You're at dinner with friends, and someone excitedly announces their latest AI investing strategy—putting half their portfolio into artificial intelligence stocks. This scene plays out countless times, as the human brain sees AI's transformative potential and leaps to a seductive conclusion: concentrate everything on the obvious winner. History suggests this is precisely the wrong approach. Academic research demonstrates that concentrated investing carries dispr
TEBI
Aug 18, 20257 min read
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