The S&P 500 is hard to beat because it weights every company by market value. Rising stocks automatically take up more of your fund and sinking ones less, without a single trade. Own a low-cost S&P 500 index fund and hold it through downturns so the weighting can do its job.
Over the 20 years through June 2026, 93% of actively managed funds that pick large U.S. stocks trailed the S&P 500 after fees, according to S&P Dow Jones Indices’ SPIVA scorecard. The design behind that record is easy to miss because the index looks like a fixed list of 500 big American companies.
That list reshuffles its proportions every trading day, since each company’s weight tracks its share of the group’s total market value. That matters because stock market gains are lopsided. Finance professor Hendrik Bessembinder studied U.S. stocks back to 1926 and found that the best-performing 4% of companies produced the market’s entire net gain. The rest, taken together, only matched short-term Treasury bills. A fund manager who skips those few names, or sells them early to lock in a profit, falls behind. The index never trims a winner for growing too big.
The membership turns over, too. S&P’s index committee adds companies that meet its size and profit rules and drops ones that fall well short. Tesla didn’t qualify until mid-2020, when it posted its fourth straight profitable quarter. It joined that December and now ranks among the index’s 10 largest holdings. J.C. Penney went the other way. The committee moved it down to the S&P MidCap 400 in 2013 after its market value shrank.
You capture the mechanism by owning it, not by improving on it. Buy a fund that tracks the standard S&P 500, not an equal-weight version, which resets every company to the same 0.2% slice each quarter by selling winners and buying laggards. Look for an expense ratio, the fund’s annual fee, of 0.05% or less. Vanguard’s and iShares’ S&P 500 exchange-traded funds each charge 0.03%.
Then hold through downturns. Selling after a drop swaps the index’s rule for your nerves.
The index already promotes its winners and demotes its laggards. Your only job is to stay invested while it does.
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