Desperate to Diversify: Concentration Risks Creep Higher

Earnings season is in full swing, and five of the "Magnificent 7" are reporting quarterly results this week. Wall Street has been steadily raising the alarm on mega-cap concentration risks, and recent notes out from Goldman Sachs and Vanguard have cranked up the hazard level a notch. Citing the worst equity market concentration in roughly 100 years, Goldman is now projecting a mere 3% nominal return for the cap-weighted S&P 500 over the next 10 years. This equates to just a 1% real return. Excluding the concentration variable, the annualized return would rise to 7%.

Market cap of 10 largest SP500 cos. as share of index total

Vanguard expressed a similarly lackluster view on equity returns over the next decade, to the tune of 3-5% -- well below the 13% average gain the market has experienced over the last 10 years and well below average analyst estimates of 6–7%. Such predictions raise questions about the appeal of stocks compared to risk-free 10-year Treasury yields, which exceed 4%. Many investors are now looking to de-risk by dialing down their exposure to the space.

Naturally, such gloomy forecasts have been met with skepticism and challenges from other analysts -- who cite powerful bullish factors, such as the transformative impact of artificial intelligence, strong mega-cap business fundamentals, and declining rates as reasons to stand strong on stocks.