May was a month of records, though the rally’s foundation was narrower than the headlines suggested. The S&P 500, Nasdaq, Dow, and Russell 2000 all set new all-time highs, powered almost entirely by technology and semiconductor stocks. The gains came despite a genuine rate scare: back-to-back hot inflation readings put a Federal Reserve rate hike back on the table and pushed long-term Treasury yields sharply higher. The pressure faded when oil prices fell more than 13%, taking inflation fears with them and clearing the way for the AI trade to reassert itself.
Beneath the surface, the picture was more complicated. Technology gained nearly 20% on the month; strip it out, and the remaining sectors were slightly negative in aggregate. Only three of the eleven sectors finished higher. Bond markets reflected the same tension, with shorter-term yields rising while longer maturities ended roughly flat. In credit, spreads generally tightened, though the riskiest tier of high-yield bonds diverged and widened. Oil fell 13.2% as the geopolitical risk premium unwound, dragging the broader commodity complex down more than 5%. Corporate earnings offered a bright spot: first-quarter blended growth came in at 28.6% against a 13.1% estimate, with profit margins reaching a record 14.8%. But like the rally itself, the earnings strength was concentrated in a handful of large semiconductor and mega-cap names.
The month also brought a change at the Federal Reserve. Jerome Powell’s term expired in mid-May, and Kevin Warsh was confirmed as the new chair. Warsh inherits a complicated environment: the base case points to a rate hike by December if the Strait of Hormuz disruption keeps oil prices elevated, the administration has expressed a preference for lower rates, and inflation remains above the 2% target. Markets will need to adjust to a new communication style just as the Fed’s independence faces heightened scrutiny.
The economic backdrop offers a similarly mixed read. The labor market has firmed after softening last fall, and manufacturing has returned to expansion territory. The consumer, however, is moving the other way, with income growth slowing and confidence near record lows by some measures. What has kept households spending is balance-sheet strength from elevated home values and a rising stock market. That support, as long as it holds, keeps the expansion intact. Whether it holds is the central question heading into the summer.
Key Takeaways
Records Built on Narrow Leadership
May’s market gains were real, but the breadth underlying them was not. Technology accounted for nearly all of the S&P 500’s advance, and most sectors finished negative. The Dow, Russell 2000, and equal-weight S&P each returned between 2% and 3%, a fraction of the Nasdaq’s performance. Momentum and high-beta factors led; defensive and dividend-oriented stocks lagged.
Why it matters: An index sitting at all-time highs on such concentrated leadership is more fragile than the scoreboard implies. Any shift in sentiment around AI and semiconductors would leave most of the market without a catalyst to offset the pressure.
Oil Was the Swing Factor
WTI crude fell 13.2% in May as the geopolitical risk premium tied to the Strait of Hormuz unwound. That decline did the critical work of easing inflation pressure mid-month, pulling Treasury yields lower and giving equities room to recover. The broader commodity complex fell more than 5% in sympathy.
Why it matters: The rally’s trajectory is directly tied to oil. The Strait of Hormuz remains functionally closed, and the physical supply disruption is unresolved. If oil prices move higher again, the inflation and rate-hike risk that rattled markets mid-month returns with it.
A New Fed Chair Adds Policy Uncertainty
Kevin Warsh replaced Jerome Powell as Federal Reserve chair in mid-May, inheriting an environment with inflation above target, a December rate hike increasingly priced in, and an administration publicly favoring lower rates. Futures markets, which began the year expecting cuts, now assign meaningful odds to a hike by year-end.
Why it matters: A leadership transition at the Fed introduces communication uncertainty at a moment when policy expectations are already shifting. Markets priced in cuts and got a possible hike. How Warsh navigates that gap, and the political pressure that surrounds it, will shape rate expectations for the remainder of the year.
Earnings Growth Is Strong but Concentrated
First-quarter blended earnings growth came in at 28.6%, well above the 13.1% estimate entering the quarter, with profit margins reaching a record 14.8%. Analysts have continued to raise forecasts, with upgrades outpacing downgrades by roughly two and a half to one.
Why it matters: Strip out the largest semiconductor names and technology’s growth rate is cut roughly in half. The same concentration that defines the price rally defines the earnings beneath it. As estimates keep rising, the bar future quarters must clear keeps rising with them.
The Consumer Is the Key Risk to Watch
The labor market has firmed and manufacturing has returned to expansion, but consumer confidence is near a record low by at least one closely watched measure, and income growth continues to slow. Households have stayed spending largely because elevated home values and a rising stock market support balance-sheet health.
Why it matters: Several years of consumer-led growth have kept the expansion intact. If the asset-price support that underlies household spending begins to weaken, reduced consumer outlays could translate into slower economic growth at the same moment the Fed may be tightening rather than easing.