The blended net profit margin for the S&P 500 reached 13.4 percent in the first quarter of 2026, according to FactSet data, the highest reading since the firm began tracking the metric in 2009. The previous record was 13.2 percent, set in the fourth quarter of 2025.
Five sectors reported year-over-year increases in net profit margins in the first quarter. Information technology led with a margin of 29.1 percent, up from 25.4 percent in the same period a year earlier. Six sectors reported year-over-year declines, led by communication services, which fell from 16.0 to 14.1 percent.
The earnings growth rate for the quarter, blended across companies that have reported and analyst estimates for those that have not, came in at 15.1 percent year-over-year, above the 13.1 percent estimate at the end of March.
What is driving the expansion
The margin expansion has two primary sources. AI-related productivity gains have reduced the cost of certain back-office and software-development functions at a rate that is beginning to show up in aggregate numbers. At the same time, companies that repriced products aggressively during the inflation period have been slower to pass cost reductions through to consumers, widening the gap between revenue and expense.
Information technology's margin of 29.1 percent is almost four percentage points above its five-year average of 25.3 percent, suggesting the sector is capturing AI productivity gains faster than its customers are extracting them through pricing pressure. That gap will not persist indefinitely, but it is wide enough to support the sector's current valuation premium.
Energy remains the laggard. Its 6.6 percent margin in the first quarter was more than three percentage points below its five-year average of 9.6 percent, reflecting the combination of lower commodity prices and capital-intensive production that makes the sector structurally more volatile than the margin figures alone suggest.
The forward estimates
Analysts project net profit margins of 14.1 percent in the second quarter, 14.6 percent in the third, and 14.6 percent in the fourth. If those estimates hold, full-year 2026 margins will average roughly 14.2 percent, a full two percentage points above the five-year average of 12.3 percent.
The projection depends on cost discipline holding while revenue continues to grow. Corporate AI spending is one of the cost lines being managed most aggressively right now — the pull-back at Meta and Microsoft is visible in the margin numbers before it shows up in product performance. The rate environment — with the federal funds target now at 3.75 to 4 percent following the September increase — creates a genuine headwind for companies with variable-rate debt or capital programs that require refinancing. The interest bill the federal government is carrying at $1.36 trillion is an extreme version of the same calculation every leveraged corporate balance sheet is making.
What the current margin environment has not yet tested is demand. If consumer spending slows meaningfully in the second half, revenue pressure could compress margins faster than cost initiatives offset it. The record margin is not a ceiling. It is a reading taken at a specific moment in a tightening cycle that has one, possibly two, moves left. The external demand picture from China complicates the forward estimate: a prolonged Chinese slowdown reduces revenue growth assumptions for the multinationals that account for a disproportionate share of the index's earnings base.
Topics marketsearningsbusiness
