Nvidia, Apple, and Microsoft Now Dominate 21% of S&P 500

The U.S. stock market is increasingly reliant on three major tech giants, Nvidia Corp., Apple Inc., and Microsoft Corp.. Together, these companies now make up over 21% of the S&P 500, a historic high for concentration in just three stocks. For comparison, IBM, AT&T Inc., and ExxonMobil Holdings Corp. collectively represented only 13.4% of the index at their peak in the mid-1980s.

This concentration has significant implications for ETF investors, as the largest S&P 500 funds are market-cap weighted. The SPDR S&P 500 ETF Trust (SPY) holds Nvidia at 8.63%, Apple at 7.25%, and Microsoft at 5.82%, totaling about 21.7% of the fund. Similarly, the Vanguard S&P 500 ETF (VOO) shows a comparable concentration, with the three companies accounting for roughly 20.8%.

The Invesco QQQ Trust (QQQ), which tracks the Nasdaq-100, has an even higher concentration. Nvidia, Apple, and Microsoft together make up about 21.5% of QQQ, despite the fund holding 100 companies. For investors seeking to reduce this concentration, the Invesco S&P 500 Equal Weight ETF (RSP) offers a different approach by equally weighting all S&P 500 constituents, with 508 holdings.

As Nvidia, Apple, and Microsoft dominate a record share of the S&P 500, ETF investors must now consider not just whether they own the broader market, but how much of their portfolio is tied to the performance of these three stocks.