The S&P 500 is sitting near highs. Yet one of the market's widely used valuation yardsticks, the forward price-to-earnings (P/E) ratio looks cheaper than it did at the start of the year.
And it's actually one of the more useful signals to come out of this earnings season, if you know how to read it. This piece walks through what forward P/E actually measures, where the number stands right now, and what's really driving it. An earnings season that beat expectations by a wide margin, a handful of sectors doing most of the heavy lifting, and two companies in particular whose results are large enough to bend the whole picture.
We'll go section by section.
A note before we start: this is an educational breakdown of publicly reported data, not investment advice. Piranha Profits is a financial education provider, not a licensed financial advisor, and nothing here is a recommendation to buy, sell, or hold any security.
First, the basics: what is forward P/E, and how is it calculated?
The price-to-earnings ratio, in any form, answers one question: how much are investors paying today for one dollar of a company's (or an index's) earnings?
Trailing P/E looks backward. It divides the current share price by earnings already reported over the last 12 months:
Trailing P/E = Current Price ÷ Earnings Per Share (last 12 months, actual)
Forward P/E looks forward instead. It divides the current price by estimated earnings over the next 12 months (or, sometimes, the next full fiscal year), based on analyst consensus forecasts:
Forward P/E = Current Price ÷ Estimated Earnings Per Share (next 12 months)
For an individual stock, that's straightforward. For an index like the S&P 500, data providers calculate it the same way but at the aggregate level. They take the index's current price level and divide it by the bottom-up sum of analyst EPS estimates across all 500 constituent companies for the next 12 months.
The reason forward P/E matters to active market-watchers than trailing P/E is simple: markets are forward-looking. A stock (or index) can look expensive on trailing earnings but reasonable on forward earnings if analysts expect strong growth ahead.
What’s the S&P 500's P/E right now
As of early September 2026, per FactSet's Earnings Insight data:
- Forward 12-month P/E: ~19.5x — slightly below the 5-year average (19.8x–19.9x) and slightly above the 10-year average (19.0x)
- Trailing 12-month P/E: 26.5x — well above both the 5-year average (24.4x) and 10-year average (23.5x)
That gap, 26.5x trailing versus 19.5x forward is the first clue. It means the market is pricing in a large jump in earnings over the next four quarters relative to the last four. Analysts are currently modeling roughly 30%+ earnings growth for full-year 2026, which is precisely what's compressing the forward multiple even as the trailing multiple looks stretched.
A forward P/E of 19.5x–19.6x sitting almost between the 10-year average (19.0x) and 5-year average (19.9x) is the textbook definition of a market that is neither cheap nor expensive on this single metric, a reasonable starting point for the deeper question of why it landed there.
The paradox: price up, forward P/E down. Here's the math.
Here's where it gets interesting. Since the start of 2026, the S&P 500 has climbed meaningfully and this earnings season has cited roughly low-double-digit percentage gains year-to-date, alongside a string of fresh record highs. If the price is going up, shouldn't the P/E go up too?
Not if earnings estimates are rising faster than the price. And that's exactly what happened.
- The S&P 500's price rose about 3.3%
- Forward 12-month EPS estimates rose about 7.9%. More than double the pace of the price move
Zoom out further and the same pattern holds for the year: the forward P/E started 2026 near 22x and has since compressed to roughly 19.6x, even as the index pushed to new highs.
The mechanism is simple arithmetic : P/E = Price ÷ Earnings. So when the earnings (denominator) grows faster than the price (numerator), the ratio falls, even while the price itself is rising.
Analysts have been revising their forward earnings estimates upward at a pace the stock price hasn't fully caught up to.
That's the short answer to "why is forward P/E down while the market is up": this isn't a market getting cheaper because sentiment soured. It's a market where the earnings outlook improved even faster than the price did. Whether that combination continues, and whether the earnings estimates driving it hold up, is the more important question that every investor will have different views on.
The earnings season that beat expectations by a wide margin
Q2 2026 beat estimates. And it beat them by an unusually large margin. Going into the quarter, analyst consensus was calling for S&P 500 earnings growth in the low-to-mid 20% range. With roughly 99% of companies having now reported:
- Blended year-over-year earnings growth: ~52%. The highest growth rate the index has posted since Q2 2021 (91.6%), and the second consecutive quarter above 25% growth
- Revenue growth: ~15.5% — the highest since Q4 2021
- 87% of companies reported a positive EPS surprise; 77% reported a positive revenue surprise
- Net profit margin: ~17.0% — a record high.
On the surface, that's an extraordinary quarter. Actual growth coming in more than double what was originally forecast. But "the S&P 500 grew earnings 52%" is an average, and averages hide a lot of dispersion. So where did that growth come from?
Industry breakdown: who grew, and who didn't
Of all the sectors that make up the S&P 500, 10 reported year-over-year earnings growth in Q2 2026, and 9 of those hit double digits. A notably broad-based result rather than growth concentrated in one corner of the market.
Sector growth rates:
- Energy: ~146% driven substantially by a sharp rise in oil prices since the end of Q2
- Communication Services: ~117% — with Meta Platforms cited as the single largest driver in this sector (more on that below)
- Consumer Discretionary: ~92%
- Information Technology: ~75% led by semiconductors, where growth within that sub-industry alone was cited near 142%
- Financials: ~22%
- Materials, Industrials, Real Estate, Utilities, and Consumer Staples rounded out the double-digit-to-positive group
The one sector that shrank: Health Care, down roughly 6.5% year-over-year. The sole decliner among the 11. Within Health Care, Biotechnology fell sharply (cited around -67%) and Pharmaceuticals was down modestly (around -8%), dragging the sector negative even as the other ten grew.
Who's really carrying the index now?
Alphabet and Amazon are outsized contributors to the quarter's results. Together, they're estimated to account for roughly two-thirds of the entire dollar-level increase in S&P 500 earnings since the quarter began.
The scale of their individual beats is part of why: Alphabet reported EPS around $9.11 against analyst estimates near $2.88, and Amazon reported around $5.75 against estimates near $1.82.
Both companies' outsized beats were driven substantially by unrealized gains on investment holdings recognized as other income, not purely by core operating performance.
Strip those two names out of the index-level math, and the picture changes: blended S&P 500 earnings growth for Q2 2026 falls from roughly 52% to somewhere in the 32–34% range.
32–34% would still be the strongest quarterly growth rate since 2022, and would mark the seventh consecutive quarter of double-digit index earnings growth. In other words: yes, two mega-cap names inflated the headline number, but the underlying breadth (10 of 11 sectors growing, 9 in double digits) suggests this isn't purely a two-stock story either.
What comes next: guidance and the road into 2027
Earnings season isn't just about what already happened, the guidance companies give for the quarters ahead shapes how the market prices things today.
- 63% of S&P 500 companies issued positive forward guidance for Q3 2026 — well above both the 5-year average (41%) and 10-year average (42%) for this metric, suggesting management teams broadly feel confident heading into the back half of the year.
- Analyst estimates currently call for ~28.5% year-over-year earnings growth in Q3 2026 and ~26.1% in Q4 2026, putting full-year 2026 growth near 31.5%. But look further out and the pace is expected to cool sharply: Q1 2027 estimates sit near 17.9%, and Q2 2027 estimates drop to just ~1.2% — before full-year 2027 growth normalizes to an estimated 15.0%.
A 19.5x multiple looks reasonable if the market believes 2026's growth rate is durable. But estimates already baked into the numbers suggest analysts themselves expect growth to slow substantially by mid-2027.
Making sense of it as a whole
Put together, here's the shape of the story this earnings season is telling:
The S&P 500's forward P/E fell even as the index rallied, because forward earnings estimates rose faster than price. A textbook sign of an improving earnings outlook rather than fading confidence. That earnings outlook was fueled by a Q2 season that beat already-optimistic expectations by a wide margin, with growth broad enough to touch 10 of 11 sectors. Energy and semiconductor-linked tech names led sector growth; Health Care, dragged by biotech, was the lone sector in decline. And guidance into Q3 was unusually upbeat, even as longer-range 2027 estimates point to a cooling-off period ahead.
For context on how that translates across individual companies rather than just the index average: a scan of all 500 S&P constituents using StockOracle™'s (10th September 2026) valuation framework around this period showed a fairly wide spread.
Roughly 9% of stocks screened as very cheap, 20% undervalued, 26% fairly priced, and the remaining ~45% split between overvalued and very overvalued.
That distribution is a useful reminder that an index-level "fairly priced" reading can sit on top of a much wider range of individual outcomes. Which is why looking at the picture stock-by-stock, sector-by-sector, matters.
None of this tells you what happens next.. Earnings estimates get revised, guidance changes, and multiples can compress or expand for reasons that have nothing to do with the fundamentals above. What this breakdown is meant to do is give you the actual mechanics behind the headline, so that "the market's near record highs but P/E is falling" reads as an explainable data point rather than a confusing contradiction.
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