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EVENT / TOPICHistorical

S&P 500 Top 15 Stocks Reach Record 46.7% Market Value

1 reports1 sources10/21/2026 updated

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The market value of the top 15 stocks in the S&P 500 has reached a record 46.7%, surpassing the 27.2% peak during the 2000 dot-com bubble by 19.5 percentage points. Nvidia, Apple, Alphabet, and Microsoft together account for 26.1% of the index, while the combined market value of the 434 smallest stocks is equal to that of the top five, highlighting record concentration. This shift underscores a significant change in index composition compared to the early 2000s.

Written with AI from the reporting · updated 10/21/2026

Latest developmentOct 21, 14:12
Top 15 S&P 500 stocks account for record 46.7% of index value, surpassing 2000 Dot-Com Bubble level
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  1. 1Unclassified fact stationOct 21, 00:00recorded Oct 21, 14:54single source

    S&P 500 top 15 stocks hold record 46.7% market value

    Read original source ↗ BeInCryptoReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    S&P 500 index
    Action：
    market value concentration
    Object：
    top 15 stocks
    Occurred (fact side)：
    Oct 21, 00:00
    BeInCrypto ↗Report pageOriginal / first version
    Published (valid side)：
    Oct 21, 14:12
    First seen (known side)：
    Oct 21, 14:54
    Fact stationSingle source · one-sided claim

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Oct 21
  1. BeInCryptoRelated fact: single source
    Top 15 S&P 500 stocks account for record 46.7% of index value, surpassing 2000 Dot-Com Bubble level

    Report first recorded Oct 21, 14:54

    The top 15 stocks in the S&P 500 now represent 46.7% of the index's total market value, a record high that exceeds the 27.2% held by the same group during the 2000 Dot-Com Bubble by 19.5 percentage points. Nvidia leads with 7.5% weight, followed by Apple at 7.1% and Alphabet at 5.9%. Together, these three mega-cap firms hold 20.5% of the index, while the 434 smallest companies collectively match the market value of the five largest stocks, highlighting an unprecedented concentration of wealth.

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