Apollo Fund Warns: S&P 500 May No Longer Offer Diversification, Has Become Highly Concentrated

Apollo's chief economist, Torsten Slok, has stated that the S&P 500 may no longer deserve its reputation as a truly diversified index. He believes that a small group of mega-cap companies now controls such a large share of the benchmark that the market has effectively become highly concentrated around a handful of stocks.

Slok points out that the top 10 companies in the S&P 500 currently account for about 34% of the entire index, representing a significant shift compared to past decades. He also notes that the share of total S&P 500 profits generated by the top 10 companies has doubled since 1996, highlighting how dominant the largest U.S. firms have become.

Currently, NVIDIA, Apple, Microsoft, Amazon, Alphabet, Broadcom, Meta, Tesla, and Berkshire Hathaway account for the vast majority of the index's weight and performance. This concentration is largely driven by the AI boom, substantial tech profits, and sustained investor demand for mega-cap growth stocks.

These remarks contribute to a growing debate on Wall Street: whether investors buying standard S&P 500 index funds are truly gaining broad market exposure or are instead making increasingly large bets on just a few tech giants.

As AI-related stocks continue to account for a major portion of market gains, this discussion is only intensifying. NVIDIA alone now represents over 8% of the S&P 500, while Apple and Microsoft together account for another substantial share of the index.