05/14/2026
If you own an S&P 500 index fund, you may be more concentrated in just a handful of stocks than you think.
The Magnificent 7 (Apple, NVIDIA, Microsoft, Amazon, Alphabet, Tesla, and Meta) now make up a historically large slice of the entire U.S. stock market. That means most index funds are heavily tilted toward these seven names, whether investors realize it or not.
History suggests that's worth paying attention to.
In 1980, the 10 largest U.S. companies included IBM, Exxon, AT&T, and General Motors. By 2000, only three were still in the Top 10. By 2025, not one remained. The companies that looked untouchable a generation ago have almost entirely been replaced.
Our colleagues at Dimensional Fund Advisors put together a one-page graphic that shows exactly how this plays out, tracing every company in the Top 10 from 1980 through 2025. The gold names are the current Magnificent 7. It tells the story better than words can.
Link to download in the comments.
For retirees especially, heavy concentration in any group of stocks adds real risk. In retirement you are drawing money out, not waiting for a recovery. A poorly timed downturn in a concentrated portfolio hits differently than it does when you are still accumulating.
This is part of why we have always built our client portfolios with a tilt toward small and value stocks rather than mirroring a standard index. Has that meant less upside during the Magnificent 7 run? Yes, and we will be the first to say it. But decades of evidence support that approach over full market cycles, and we think it is the right way to invest for the long term.
Have questions about how your portfolio stacks up? Send us a message or drop a comment below.
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Source: Dimensional Fund Advisors. For illustrative purposes only. Past performance is not a guarantee of future results. Rankings reflect approximate start-of-year market capitalizations. This material is for educational use and does not constitute investment advice.