By Elliott Wave International
If you own an S&P 500 index fund, you own a piece of 500 companies. But you may be a lot less diversified than you think.
This chart comes from Elliott Wave International’s free report, The Most Dangerous Market in History? 18 Flashing Red Signals You Shouldn’t Ignore. Here’s what EWI’s analysts say about it:
“Narrow market breadth offers another sign of speculation, as investors crowd into a handful of winning stocks. This chart shows that just 5% of S&P 500 stocks account for more than 50% of the index’s total market capitalization. A handful of high-profile tech stocks are driving the market, creating the narrowest concentration in at least 35 years.”
Last week showed what that means in practice. On Thursday, November 5, a sell-off sent the S&P 500 down 4.36%, its worst day since April 2025. The Magnificent Seven lost $1 trillion in market value in that single session. Meanwhile, the equal-weighted S&P 500, a stand-in for the typical stock, had closed at a record the day before and ended the week roughly where it started.
Stocks have since bounced back. But the takeaway stands: when a handful of stocks carry this much weight, their moves become the market’s moves, in both directions.
Market concentration is one of 18 charts in the report. The others cover record valuations, margin debt, investor sentiment and even housing.
Read the Full Report Free: See All 18 Flashing Red Signals >>
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