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If your portfolio has been riding the same cluster of mega-cap technology stocks since 2023, Morgan Stanley has a timely warning.
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The S&P 500climbed about 20% from its April low to a record high near 7,620 on June 2, fueled by optimism over the U.S.–Iran ceasefire and persistent enthusiasm for artificial intelligence.
Since then, the benchmark has stalled, closing near 7,457 on July 17 and struggling to gain traction despite strong corporate earnings.
Giant stocks are pulling in opposite directions, and those offsetting moves are keeping the broader market locked in place.
Morgan Stanley Wealth Management chief investment officer Lisa Shalett laid out those dynamics in her July Global Investment Committee presentation.
Her conclusion carries a pointed implication for anyone who remains heavily concentrated in the same handful of Big Tech names.
Semiconductor stocks have ballooned to a historic share of the S&P 500
The core of Shalett’s case is about how lopsided the S&P 500 index has become, and exactly where that imbalance is concentrated.
The 10 largest stocks now represent about 40% of the S&P 500’s total market value, according to Morgan Stanley Wealth Management’s July 2026 Global Investment Committee note.
A modest pullback in just a few of those names can erase gains from hundreds of other companies in the AI trade.
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Chipmakers have surged to extreme valuations, with semiconductor market capitalization growing to about 18% of the S&P 500, Shalett noted. That figure stood at roughly 3% for most of the index’s modern history, illustrating how concentrated the rally has become.
Investors have simultaneously punished the “Magnificent Seven” hyperscaler stocks over concerns about the cost of their massive AI infrastructure buildouts.
That creates an index-level stalemate where one group of trillion-dollar names gets bid higher while another gets sold, and a concentrated portfolio goes nowhere.
Morgan Stanley says the AI trade is entering a cost-conscious phase
The real substance of Shalett’s note goes beyond diagnosing the stall and into where the AI investment cycle is heading next.
Enterprises are moving from an early adoption phase focused on maximizing AI usage to a disciplined approach that prioritizes cost control, the committee observed.
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That transition is pushing what the firm calls “hybrid engineering” across the AI technology stack, Shalett explained in the presentation.
In practical terms, companies are becoming more willing to blend expensive frontier AI models with lower-cost open-source alternatives and to diversify their hardware choices.
That trend could pressure chipmakers whose valuations assume limitless demand while rewarding cloud providers that adapt to leaner enterprise budgets, the firm noted.
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How semiconductor concentration risk affects index fund investors
Investors holding S&P 500 exchange-traded funds carry sector concentration that is not always visible.
Cameron Dawson, chief investment officer at NewEdge Wealth, quantified the scale during a recent interview on the Thoughtful Money program. A decade ago, semiconductors accounted for about 2% of the S&P 500, and today that figure sits near 18%, she noted.
That means a passive investor who believes they hold a diversified portfolio has nearly one in five dollars exposed to the chip trade.
Chip stocks are projected to deliver about 133% year-over-year earnings growth in the second quarter of 2026, according to data compiled by the London Stock Exchange Group (LSEG) and cited by earnings research head Tajinder Dhillon.
That single sector accounts for roughly 44% of the entire S&P index’s profit expansion, and the Philadelphia Semiconductor Index has fallen about 20% from its late-June record high, entering bear-market territory, according to Bloomberg.
Morgan Stanley’s positioning adjustments for the second half of 2026
Shalett’s team outlined several moves in the July note that reflect the firm’s view on where market leadership is migrating.
Investors with large gains in semiconductor holdings may want to capture profits, especially where earnings expectations appear stretched, the committee recommended.
The team also suggested selectively revisiting hyperscaler stocks that are retooling their businesses to serve cost-conscious AI demand across enterprise customers.
On the fixed-income side, the firm pointed to intermediate-term bonds as a priority allocation, with longer-duration bonds worth adding if yields climb further, Shalett noted.
The committee also emphasized global diversification, noting that non-U.S. equity markets have continued to outperform and offer a reason to broaden exposure.
Gargi Pal Chaudhuri, BlackRock’s chief investment and portfolio strategist for the Americas, has argued that “continued dispersion” will define 2026, urging investors to broaden holdings beyond the AI trade, according to her February appearance on Yahoo Finance’s Market Domination Overtime.
Chaudhuri told Yahoo Finance that ‘continued dispersion’ will be a defining 2026 theme as leadership broadens away from the AI infrastructure trade, with markets rewarding companies that convert AI spend into profitability rather than those simply announcing more capex.
The shift from AI builders to AI adopters is gaining momentum
Shalett’s thesis builds on a pattern that Morgan Stanley has been developing since February, when the firm first flagged a rotation from mega-cap tech.
In an earlier note, the committee argued that capital would eventually flow from AI “builders” selling infrastructure to AI “adopters” boosting margins with the technology.
Health care, energy, software, and financial services were all identified as sectors with meaningful tailwinds from AI adoption in the report.
That rotation appeared to stall during the spring rally as chipmakers recaptured attention, but the July semiconductor selloff suggests it is now resuming.
Morgan Stanley’s Global Investment Committee framed the takeaway as a call to broaden, not exit, the AI theme, arguing that the next phase of returns is more likely to reward selective exposure across sectors than continued concentration in the same handful of Big Tech names.
Related: Morgan Stanley sends strong verdict on memory stocks
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This story was originally published July 26, 2026 at 6:33 AM.