S&P 500 Ends Lower: Chips -5.3%, Moderna +13%, Inflation Above 4%
Key Takeaways
- A volatile session saw the S&P 500 close marginally lower as a 5.3% chip sell-off collided with a 13% Moderna rally.
- With May inflation topping 4%, the Fed's next move remains a key market driver.
Mentioned
Key Intelligence
Key Facts
- 1The PHLX semiconductor index fell 5.3% on June 26, 2026, marking a sharp sell-off in AI-related chip stocks.
- 2Moderna shares surged nearly 13%, reaching their highest level since 2024, after an investor event showcased its pipeline.
- 3Apple stock rebounded 3.1% on June 26, recovering from a previous day's decline after it raised iPad and MacBook prices due to soaring memory chip costs.
- 4US inflation rose above 4% in May 2026, driven by energy prices amid the Iran conflict, keeping the possibility of a Fed rate hike alive.
- 5Eight of the 11 S&P 500 sector indexes declined, with industrials down 3.41% and materials down 2.45%.
- 6David Stubbs of AlphaCore Wealth Advisory warned that questions around AI profitability and capex are not going away, and that Wall Street could be vulnerable to earnings misses.
AI-related chipmakers lead sell-off
It’s too early to conclude that there’s a major correction brewing in tech, but what I would say is that the questions around profitability and the capex story are certainly not going away.
On the chip sell-off
Analysis
Financial markets on June 26, 2026 delivered a stark sector divergence: AI chip stocks cratered while Moderna rocketed. For investors, the session crystallized the triple threat of sticky above-4% inflation, a potential Fed rate hike, and growing doubts over AI-related capital expenditures. The mix of a defensive rotation and lingering macro risk underscores why tactical portfolio positioning is more crucial than ever.
On June 26, 2026, the S&P 500 closed marginally lower after a turbulent session defined by a stark sector rotation. The PHLX semiconductor index plummeted 5.3%, underscoring growing unease about the profitability of massive investments in artificial intelligence infrastructure. This drop was among the steepest sector declines in recent years and highlighted the ongoing volatility in AI-related chipmakers that have propelled much of Wall Street's gains. In contrast, healthcare stocks rallied sharply, led by Moderna's nearly 13% surge to its highest level since 2024 following an upbeat investor event where the drug developer showcased its pipeline. Apple, which had sold off the previous day after raising iPad and MacBook prices due to soaring memory chip costs, rebounded 3.1%, partly mitigating broader tech losses. The mixed market action left eight of the 11 S&P 500 sectors in negative territory, with industrials plunging 3.41% and materials off 2.45%, while healthcare and consumer staples provided defensive support.
The mixed market action left eight of the 11 S&P 500 sectors in negative territory, with industrials plunging 3.41% and materials off 2.45%, while healthcare and consumer staples provided defensive support.
The session's macro backdrop was dominated by a fresh inflation reading: US consumer prices rose above 4% in May, as the Iran conflict drove energy costs higher. That data, released on June 25, kept alive the possibility of another Federal Reserve interest rate hike, adding to investor anxiety. Although oil prices had retreated from their peaks, Apple's decision to raise prices signaled persistent cost pressures, with chief market strategist Art Hogan of B. Riley Wealth likening the current memory chip supply shock to pandemic-era semiconductor disruptions. David Stubbs, chief investment strategist at AlphaCore Wealth Advisory, cautioned that while it was premature to call a major tech correction, questions about AI capital expenditure and near-term returns were "certainly not going away." He warned that Wall Street remains vulnerable to signs that companies cannot meet elevated earnings expectations, a risk amplified by the heavy spending on AI data centers.
What to Watch
The chip sell-off is the latest signal that investors are becoming more discriminating about AI plays. After years of exuberance, the market is demanding clearer evidence of payoff periods for billions in investments. The PHLX index's 5.3% single-day drop is a reminder that the AI trade, while still long-term compelling, faces a bumpy path as inflation and interest rate dynamics raise the discount rate on future earnings. Meanwhile, the rotation into healthcare and defensive sectors suggests that traders are cautiously hedging against a potential economic slowdown prompted by sustained inflation and monetary tightening. Moderna's resurgence—fueled by pipeline optimism—highlights how biotech can serve as a haven when tech falters, especially if its innovations promise near-term revenue catalysts.
Looking forward, the interplay between inflation readings, Fed policy, and earnings season will be critical. Should AI giants fail to demonstrate scalable returns from their capex in the upcoming quarters, further chip sector drawdowns are likely. Conversely, positive data from healthcare firms like Moderna could reinforce defensive rotations. The market remains in a delicate balance, with the tech sector's fate hinging on the convergence of macro stability and tangible AI monetization. Investors should monitor Fed commentary closely and watch for any additional supply-chain cost pressures that could undercut corporate margins. Ultimately, June 26's session encapsulates the current market narrative: a tug-of-war between transformative technology promise and the harsh reality of its cost.
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