You Think You Own 500 Stocks. You’re Mainly in 10.

Chart of the Day

OCTOBER 20, 2026

MONEY • MARKETS

Ten Stocks Now Own 41% of the S&P 500. A Decade Ago, It Was 19%.

If you own an S&P 500 index fund, you’re making a much bigger bet than you think.

19%

’90

18%

’95

23%

’00

21%

’05

20%

’10

19%

’15

29%

’20

41%

’25

Combined index weight of the 10 largest S&P 500 companies by market cap, measured at year-end.

Source: S&P Dow Jones Indices, FactSet, 2026

You probably own an S&P 500 index fund. Most people do. And most people think that means they own 500 stocks, spread across every corner of the American economy. That sounds like diversification. It isn’t.

Today, just 10 companies... Nvidia, Apple, Microsoft, and seven others... control 41 cents of every dollar in that index. A decade ago, it was 19 cents. The top of the S&P has gotten twice as crowded in just 10 years.

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And here’s the part that really gets me. In 1990, the top 10 were Exxon, GE, IBM, AT&T, and Philip Morris. Blue-chip America. Not one of them is in the top 10 today. Not one. The market was certain they’d be there forever. It was wrong.

Three companies alone... Nvidia, Apple, and Microsoft... now make up nearly 20% of the index. That means if those three stocks have a bad week, your “diversified” index fund has a bad week too. That’s exactly what happened last week, when AI stocks sold off and dragged the whole S&P down with them.

This doesn’t mean sell everything. It means know what you own. An index fund today isn’t the same product it was in 2015. You’re twice as exposed to a handful of tech names, whether you chose to be or not.

THE TAKEAWAY

“In 2015, the ten biggest stocks in the S&P 500 made up 19% of the index. Today it’s 41%. Your ‘diversified’ index fund is twice as concentrated as it was a decade ago.”

That’s worth pulling up your 401(k) statement this week. Look at what’s actually inside your index fund. If you’re comfortable with that bet, fine. But if you didn’t know you were making it... now you do.

More tomorrow. Stay sharp.

— Ray Calloway

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You Think You Own 500 Stocks. You’re Mainly in 10.

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