Citi characterized the U.S. first-quarter earnings season as strong at face value but layered with complexity when the details are examined. The bank highlighted that much of the apparent upside at the index level reflected non-recurring items and a tight concentration of contributors rather than broad-based fundamental acceleration.
One-offs and concentration
According to Citi, about half of the S&P 500's index-level earnings beat in the first quarter was attributable to one-time adjustments, including tariff-related add-backs and asset mark-ups. When those items are removed, the aggregate beat is more consistent with the prevailing trend, indicating that core earnings growth remained solid but not exceptional.
Concentration emerged as a defining feature of the quarter. Citi noted that roughly 20 stocks were responsible for the bulk of the index's earnings upside, with technology companies predominating among that group. The bank observed a parallel concentration in forward guidance - the same cluster of names accounted for most of the consensus increases across the second through fourth quarters.
Two forces shaping market performance
Citi described the market environment as bifurcated and driven by two principal forces. On one side, growth-oriented sectors tied to artificial intelligence continued to see outsized upward revisions to forecasts and corresponding price outperformance. On the other, geopolitical developments - specifically the conflict in Iran - and the resulting upward pressure on oil prices influenced a separate segment of the market, notably energy.
Energy stocks stood out because higher oil prices, prompted by the Iran conflict, lifted forward estimates for the sector. By contrast, many consumer discretionary names lagged as elevated fuel costs and lingering inflation weighed on demand expectations.
Extent of AI exposure and implications for the index
Citi estimated that approximately half of the S&P 500 by weight is linked to AI-driven growth themes. The remainder of the index, the bank said, was more exposed to macroeconomic and geopolitical variables - principally the Iran conflict, oil, and broader inflation dynamics. Citi found that first-quarter results and the revisions for the remainder of the year were broadly consistent with that split in exposure.
Because outperformance in the quarter was concentrated in a narrow band of names, the bank concluded that broader market participation would be a necessary condition for meaningful additional upside from current index levels. That broadening, Citi added, depends importantly on improved visibility around how the Iran situation will wind down and what that trajectory implies for oil prices, inflation, and interest rates.
In the absence of such clarity, Citi warned, the index was likely to remain dependent on the same compact roster of outperformers that drove results in the first quarter.
Market context and notable drivers
The S&P 500 has risen about 8% so far this year, with much of that gain concentrated in technology shares benefiting from AI optimism. Nvidia was singled out as a major driver of the advance, with the chipmaker approaching a $6 trillion valuation amid investor expectations that it will continue to capture AI-related spending. The company is scheduled to report fiscal first-quarter results next week.
The market's current profile - a mix of narrow leadership and a substantial portion of the index tied to competing macro and geopolitical risks - frames Citi's view that index-level upside depends on a more diversified participation and clearer indications regarding the future path of oil, inflation, and interest rates.