Unexpectedly Intriguing!
27 January 2022

At the end of 2021, the companies that make up the S&P 500 (Index: SPX) were collectively worth $42.37 trillion. The 10 stocks that make up the largest components of the market capitalization weighted index accounted for 29.5% of that value. The following chart shows their share of the market cap of the whole index:

S&P 500 Market Capitalization, Snapshot on 31 December 2021

The other 495 firms in the S&P 500 have a collective market capitalization of $29.86 trillion.

Here is the list of the top 10 components of the S&P 500 index as of 31 December 2021:

  • Apple (NASDAQ: AAPL)
  • Microsoft (NASDAQ: MSFT)
  • Amazon (NASDAQ: AMZN)
  • Alphabet (A) (NASDAQ: GOOGL)
  • Tesla (NASDAQ: TSLA)
  • Alphabet (C) (NASDAQ: GOOG)
  • Facebook (NASDAQ: FB)
  • Nvidia (NASDAQ: NVDA)
  • Berkshire Hathaway (B) (NYSE: BRK.B)
  • United Healthcare (NYSE: UNH)

The top two firms, Apple and Microsoft, had market caps that were nearing $3 trillion each, with Apple briefly exceeding that value in early January 2022. If we combined the market cap for the two classes of Alphabet stocks, the firm formerly known as Google would have a market cap in excess of $1.8 trillion, which would rank third. Separately however, the individual Alphabet stocks rank fourth ($0.92 trillion) and sixth ($0.85 trillion) for their market cap in the S&P 500 index among the individual stock listings.

The undivided Amazon ranks third for individual stocks with a market cap of nearly $1.5 trillion. Tesla ranks fifth at $0.91 trillion, with its market cap squeezing in between the two classes of Alphabet shares. Facebook came in seventh at $0.85 trillion, graphics chipmaker Nvidia was eighth at $0.77 trillion, followed by re-insurer/conglomerate Berkshire Hathaway at $0.57 trillion.

Closing out the list, United Healthcare had a market cap of just under $0.50 trillion, edging out JP Morgan Chase (NYSE: JPM), which it replaced in the S&P 500's top 10 stocks since our August 2021 update.

References

Standard and Poor. S&P 500 Index Earnings and Estimates. [Excel Spreadsheet]. Accessed 31 December 2021.

Standard and Poor. S&P Market Attributes. [Excel Spreadsheet]. Accessed 31 December 2021.

Slickcharts. S&P 500 Companies by Weight. [Online Database]. Accessed 31 December 2021.

Ycharts. S&P 500 Market Cap. [Online Database]. Accessed 31 December 2021.

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