Index funds vs. stock picking: what the evidence shows

What does the evidence actually show?

S&P Dow Jones Indices has published its SPIVA scorecard since 2002, comparing actively managed funds with their benchmark index. The finding repeats in nearly every category: over long periods, the majority of professional stock pickers trail the plain index they are trying to beat, and the longer the period, the larger that majority grows.

The numbers are blunt. Measured over the 15 years ending December 31, 2024, the SPIVA U.S. Scorecard found that close to 90% of actively managed U.S. large-cap funds trailed the S&P 500. The single-year results bounce around more, and 2025 was a rough one for the pickers: SPIVA's year-end 2025 scorecard reported 79% of active large-cap U.S. equity funds underperforming the index, the fourth-worst showing in the scorecard's 25-year history. Neither figure is a prediction. What they describe is a persistent headwind, one that gets steeper the longer you measure, and past performance is not indicative of future results.

The pattern has nothing to do with intelligence. Professional managers are smart, well-resourced, and hard-working, and that's precisely the problem: they are competing against each other, and their collective trading is what sets prices. William Sharpe laid out the math in his 1991 paper The Arithmetic of Active Management: before costs, the average actively managed dollar earns the market's return, so after costs it must earn less. The index fund simply declines to pay the costs.

A second line of evidence explains why beating the market by picking individual stocks is so hard. In a 2018 study published in the Journal of Financial Economics, Do Stocks Outperform Treasury Bills?, Arizona State finance professor Hendrik Bessembinder tracked nearly 26,000 US stocks back to 1926 and found that just over 4 percent of companies accounted for the entire net gain of the US stock market above one-month Treasury bills. The other 96 percent, taken together, did no better than cash, and more than half of individual stocks lost money over their lifetime. When returns are that concentrated, a stock picker's result rides on holding a handful of extreme winners; miss them, which is the likely outcome, and you trail the index that owned them all along. A broad index fund captures those rare winners by default.

None of this says markets are perfect, or that an index fund is automatically the right holding for every account you own. It says the burden of proof sits with the expensive approach. When someone proposes an active strategy for your money, the useful question is what evidence suggests it will clear its extra costs, and the scorecards are a fair place to test the answer.

Why do costs decide the outcome?

Every dollar of fees, trading costs, and avoidable taxes comes straight out of your return, every year, whether the picks land or not. Index funds come out ahead in the scorecards mostly because they cost less to run and trade less often. The advantage is structural rather than clever, which is exactly what makes it durable.

A percentage point of annual cost sounds trivial next to market swings, but the swings average out over time and the costs never do. They compound in reverse, the same math that grows your money running against it, year after year, in every market. Turnover adds a second bill in taxable accounts, where frequent trades can trigger capital gains taxes on the fund's schedule instead of yours.

This is why cost is the first filter I apply for clients. The portfolios I build are assembled from low-cost funds, and turnover stays low on purpose. Nobody controls what markets return; costs and taxes are the levers that stay within reach.

Is picking stocks ever worth doing?

As entertainment with a budget, yes. If researching companies is a hobby you enjoy, a small account capped at a few percent of your portfolio lets you scratch the itch without betting your retirement on it. The harm shows up when picking becomes the plan: concentrated positions, tax drag, and hours you never get back.

The line I draw for clients is between entertainment and load-bearing money. A single company can lose most of its value and never recover; a fund holding thousands of companies has never had to make that phone call. So the retirement accounts, the college money, and the future you're counting on ride in the diversified core. A stock idea that excites you lives in the small account, where a win is fun and a loss changes nothing that counts.

One middle case deserves its own mention. If you already hold a large position in a single stock, from an employer or an inheritance, the index-versus-picking debate is beside the point. The concentration itself is the risk to plan around, and unwinding it well is a tax project as much as an investment decision.

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