S&P 500 profit margins hit record highs in Q2, but one company is doing a lot of heavy lifting

Corporate America just posted its fattest margins on record. The S&P 500’s blended net profit margin hit 15.7% in Q2, according to FactSet, eclipsing the previous high of 14.8% set just one quarter earlier. That’s a meaningful jump from the 12.9% logged in Q2 2025, and the best reading since FactSet began tracking the metric in 2009.

Eighty-six percent of companies beat their earnings per share estimates during the quarter. The index is now on track for its 10th consecutive quarter of earnings growth.

The Alphabet effect

Alphabet reported $112 billion in quarterly net income during Q2. That number is staggering on its own, but roughly $77 billion of it came from unrealized gains on various investments, including its stake in SpaceX. Strip Alphabet out of the calculation entirely, and the S&P 500’s blended margin drops to around 14.4%.

That’s still a solid number, but the gap between 15.7% and 14.4% illustrates just how much a single company can move the needle for an index of 500.

Broad strength, with caveats

Seven out of eleven S&P 500 sectors posted year-over-year margin improvements. Eight sectors beat their five-year average margins.

Health care stood out as a notable laggard. The sector struggled with margin expansion relative to its peers, a dynamic worth watching given its size and significance within the index.

What the second half looks like

Analysts are projecting margins of approximately 14.6% for the back half of 2026. That would represent a step down from Q2’s record but would still be historically elevated.

The forward estimates suggest Wall Street expects profitability to remain robust, just not quite at the peak levels inflated by Alphabet’s investment gains. Unrealized gains are, by definition, unrealized. They can reverse. And when a significant portion of the record margin traces back to paper profits on venture-stage investments, the durability of that particular contribution is worth questioning.

For investors, the key tension is straightforward. Margins are at records, earnings growth is persistent, and the beat rate is high. But when a single company’s investment portfolio can swing the entire index’s profitability by more than a full percentage point, the gap between the headline number and the underlying reality creates a fragility that only becomes visible when the outliers stop outperforming. The S&P 500 is genuinely profitable. Whether it’s 15.7%-profitable or 14.4%-profitable is a distinction that matters more than it might seem.

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