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Market concentration is at historic extremes

Posted by ipso facto @ 8:56 on October 21, 2026  

The Kobeissi Letter
@KobeissiLetter
·
10h
BREAKING: The 15 largest S&P 500 stocks now account for a record 46.7% of the index’s market value.

By comparison, during the 2000 Dot-Com Bubble, the 15 largest stocks accounted for 27.2% of the S&P 500.

The remaining 485 stocks represent just 53.3% of the S&P 500’s market cap.

This comes as Nvidia,
$NVDA
, Apple,
$AAPL
, Alphabet,
$GOOGL
, and Microsoft,
$MSFT
, account for 7.5%, 7.1%, 5.9%, and 5.6%, respectively, or 26.1% combined.

This means just 4 stocks account for more than the next 11 combined.

Furthermore, the combined market cap of the 5 largest stocks now equals that of the bottom 434 stocks in the index, the largest gap on record.

Market concentration is at historic extremes.

graphic

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Post by the Golden Rule. Oasis not responsible for content/accuracy of posts. DYODD.