AI Powered Bull Market in S&P, Now It Needs More Building Blocks

he bull market in US stocks is showing few signs of stress as it approaches its fourth anniversary: Corporate profits are rock-solid, the S&P 500 Index is near a record and volatility appears subdued.

But deep down, questions are swirling around what could derail the gauge’s 117% advance since Oct. 12, 2022, when this bull market began. While there’s no single answer, a massive divergence between stock indexes trading at records amid the lackluster performance of many individual shares is emerging as a major point of contention.

A version of the S&P 500 stripped of market-cap bias has trailed the benchmark equities gauge by 52 percentage points since October 2022. That’s the widest underperformance this far into a bull market since at least the 1990s, data compiled by Bloomberg show.

See more: The Message From Market Breadth

“This bull market will continue — but my worry is how narrow the rally is compared with history,” CFRA chief investment strategist Sam Stovall said by phone. “There will be a time when this ends, but everything will hinge on Corporate America’s profit growth and outlooks.”

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At 117%, the advance in the S&P 500 since 2022 is the third-largest for bull markets at their fourth anniversary, according to CFRA data going back 1947. And when the rally extended to a fifth year, the average gain was 21%, the data show. Theoretically, that leaves plenty of room for the rally to broaden out beyond technology megacaps that have driven the lion’s share of gains since October 2022.