Market concentration is creating ‘fragility’: Only 60% of S&P 500 stocks are above their 200-day average

May 31, 2026
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With stellar earnings powering stock indexes to all-time highs, Wall Street now wants to see the market broaden.

“Any time you have narrow leadership, despite what is doing the leading, it just creates more of a fragility in markets in general,” Matt Stucky, Northwestern Mutual Wealth Management chief portfolio manager, told Yahoo Finance last week.

“That growth in the fundamentals, even though it’s broadened some, it is showing up in more concentrated markets today,” he added.

The main driver of the stunning V-shaped recovery from the March 30 lows has been semiconductor stocks, especially memory makers.

UCLA PhD Student in electrical engineering, Jui-Han Liu, shows a semiconductor wafer with chiplets attached at the Center for Heterogeneous and Performance Scaling laboratory during the official launch of the Semiconductor Hub at the UCLA Samueli School of Engineering in Los Angeles, on May 21, 2026. (Photo by ETIENNE LAURENT / AFP via Getty Images)

UCLA PhD Student in electrical engineering, Jui-Han Liu, shows a semiconductor wafer with chiplets attached at the Center for Heterogeneous and Performance Scaling laboratory during the official launch of the Semiconductor Hub at the UCLA Samueli School of Engineering in Los Angeles, on May 21, 2026. (Photo by ETIENNE LAURENT / AFP via Getty Images) · ETIENNE LAURENT via Getty Images

When Micron (MU) crossed the $1 trillion market cap for the first time this past Tuesday, it became the 11th-largest US public company by market value, behind Eli Lilly (LLY) and ahead of Walmart (WMT). Its sharp rally that day accounted for 18 of the S&P 500’s (^GSPC) 45-point gain, according to data from Bespoke Investment Group.

“Semiconductor and memory-related stocks have experienced parabolic advances,” said Adam Turnquist, chief technical strategist at LPL Financial.

“While overbought conditions alone are not necessarily bearish, the probability of near-term profit taking or rotational activity appears to be rising as investor positioning becomes increasingly crowded,” he noted.

Turnquist pointed out that only about 60% of S&P 500 stocks are trading above their 200-day moving average, below the historical average of roughly 73% when the index is hitting new highs.

Within the Dow Jones Industrial Average (^DJI), which recently notched new highs on Wednesday, fewer than half of the index’s components contributed to the gains over the three-month stretch between its record peaks.

Talk of lower interest rates would have to come back for investors to see a broader rally into the more cyclical parts of the economy, per Turnquist.

For now, market bulls point to an expanding AI trade encompassing server makers and networking and infrastructure players. Legacy computer maker Dell (DELL) soared over 50% last week on accelerating demand for AI servers.

“This is what an AI supercycle looks like,” Evercore ISI analyst Amit Daryanani wrote in a note.

Rival Hewlett Packard (HPE) also jumped 12% as AI “picks and shovels” stocks caught the next wave of the AI trade. Even names like Ford (F) have caught interest on the back of a $2 billion investment in energy storage. The stock is up more than 30% year to date.

Shares of Caterpillar (CAT), known for its tractors, have surged 45% amid a boom in the company’s Power and Energy unit.

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