Record Corporate Margins Hide a Quiet Two-Company Warning
Corporate America just posted its most profitable quarter in at least 17 years — and the details matter more than the headline. The S&P 500’s net profit margin hit 16.9% in the second quarter, according to FactSet data, the highest reading since the firm began tracking the metric in 2009. That’s up sharply from 14.8% in the first quarter and 12.9% a year ago, and well above the five-year average of 12.4%. For long-term investors, the real question isn’t whether margins are rising — it’s whether this kind of profitability is durable or borrowed from a couple of unusual sources.
Two names explain an outsized share of the jump. Alphabet posted a 34% operating margin, up from 32% a year earlier, and booked a $98 billion gain in other income — mostly unrealized paper gains on equity stakes, not cash from operations. Amazon logged $53.4 billion in other income, largely tied to its investment in Anthropic, while its own operating margin rose to 13.7% from 11.4%. Strip both companies out and the S&P 500’s margin still lands at 15%, itself a record dating back to 2009 — so the strength is real and broad, not just a mega-cap illusion. Eight of the index’s 11 sectors improved margins year-over-year, led by technology, communication services, consumer discretionary, and energy.
Vanguard senior economist Adam Schickling frames it simply: "Businesses, when they’re busy, are more profitable. Firms are busier, they’re more efficient, and that translates into higher margins." Tech’s asset-light model — adding customers without proportional cost increases — remains the structural edge behind sector-leading profitability. But Schickling also flags rising competitive pressure from new entrants as a risk to that edge going forward, a reminder that today’s moat can narrow.
So what for long-term investors: margin expansion is a legitimate signal of quality and pricing power, but the 2026 number is flattered by paper gains that could reverse with market swings. Before paying up for record profitability, separate durable operating margin from one-time investment gains, and watch whether competitive intensity in tech — where most of the improvement is concentrated — starts compressing the very edge that produced it.
