5 signs the earnings-fueled rally powering the S&P 500 is set to fade

The S&P 500’s advance has been supercharged by stellar profit reports, with a strikingly high share of companies beating expectations and aggregate earnings growth tracking at the strongest pace since 2021. Yet there are growing signs this momentum may be bumping up against its limits. Jim Paulsen, former chief investment strategist at the Leuthold Group, cautions that several leading indicators now point to a cooling in profit growth—potentially removing a key pillar of the recent rally.

“Contemporary stock market bullishness is being driven primarily by incredible profit momentum,” Paulsen notes, while warning that sustaining that pace—especially against rising expectations—could prove difficult. Here are five warning signs he’s watching.

1) Earnings strength is growing narrower

The rally’s foundation looks less broad than in past profit upswings. A smaller subset of S&P 500 companies is driving the gains in forward earnings estimates. Over the last four weeks, just 122 index constituents have seen 12-month forward EPS estimates rise, compared with a peak of 163 in 2020. Narrow breadth can leave the market more vulnerable if a handful of leaders stumble or guidance resets lower, as fewer companies are offsetting any disappointments.

2) Higher rates and tighter policy are starting to bite

Interest rates remain elevated, with the 10-year Treasury yield hovering near 4.6%. Historically, shifts in bond yields tend to lead corporate profits by roughly two years. While higher rates don’t immediately dent earnings, they gradually tighten financial conditions, raise borrowing costs, cool demand, and squeeze margins—eventually filtering into slower profit growth.

Fiscal tailwinds also appear to be fading. A declining deficit-to-GDP ratio implies less incremental fiscal support than in recent years. That “less juice” effect, combined with higher rates, can pressure sales growth and profitability, particularly for more leveraged firms and interest-sensitive sectors.

3) Profit margins may be near a ceiling

Corporate profits as a share of GDP are around 14%—the highest since World War II. While productivity gains and technology adoption can structurally improve margins, history suggests profit shares are mean-reverting and face practical upper limits. As margin levels approach prior extremes, the risk of normalization grows, whether through rising labor costs, intensified competition, or weaker pricing power as demand moderates.

4) Commodities are flashing a caution signal

Sharp commodity upswings have often preceded subsequent declines in earnings per share. Since 1970, EPS for the S&P 500 has typically struggled after peaks in commodity prices. Oil remains elevated, with Brent crude recently trading around the high-$80s per barrel. Elevated input costs can crimp margins, and if energy prices have already peaked, the historical pattern suggests earnings momentum could soften as cost pressures meet cooling demand.

5) Cyclical stocks are lagging

Before profits roll over, cyclical sectors often underperform. Recently, consumer discretionary and real estate—two of the more economically sensitive corners of the S&P 500—have trailed the broader index and notched slight losses over a three-month window. Weakness in cyclicals can be an early signal that earnings growth is set to slow, as these sectors tend to be most responsive to changing demand, credit conditions, and rates.

What a fade in earnings momentum could mean

The bar for continued outperformance is high. With expectations elevated, even modest disappointments—softer guidance, narrower breadth, or margin pressures—could weigh on valuations. That doesn’t preclude further gains, but it does raise the odds that the rally becomes more volatile and selective, with leadership potentially rotating and dispersion increasing.

Key markers to watch from here include:

• Changes in earnings breadth across the index, not just headline beat rates.
• Moves in the 10-year Treasury yield and broader financial conditions.
• Trends in the deficit-to-GDP ratio and fiscal impulse.
• Corporate profit margins and pricing power—especially in sectors with rising labor or input costs.
• Commodity price trends, particularly energy, and their impact on costs and demand.
• Relative performance of cyclical sectors versus defensives and quality growth.

For investors, this backdrop favors a focus on balance sheet strength, sustained cash flow generation, and realistic guidance. If the earnings engine that has powered the market cools from hot to warm, leadership may broaden or rotate, and sentiment could reset. The message from these five signs is not necessarily that a downturn is imminent, but that the easiest part of the earnings-driven rally may be behind us.