Is the S&P 500 Overvalued Right Now? What the Numbers Say
By the usual yardsticks the index is expensive. Here are the dated numbers, including our own count of the 500 largest US stocks, what high valuations have and have not predicted, and how to check how much of your money sits in the priciest part of the market.
Key takeaways
- Yes, by most common measures. In Exent’s data of Oct 22, 2026, the 500 largest US stocks traded at 24.9 times trailing earnings; the Shiller CAPE was 41.08 on Oct 21, 2026, against a long‑run mean of 17.44.
- The forward P/E was 19.0 on Sep 30, 2026, about 10% above its 30‑year average of 17.2 (J.P. Morgan). The CAPE was more than twice its long‑run mean.
- The 10 largest companies were 38.9% of the value of the 500 largest US stocks and earned 37.5% of their profits, at 26.5 times earnings vs 23.9 for the other 490.
- High valuations were followed by weak decades: from a CAPE above 40 in January 2000, the S&P 500 returned about −1.0% a year to 2009. They were a poor guide to the next 12 months.
- Valuation is a reason to know what you own, not a timing signal. Check how much of your money sits in the 10 largest companies and in the highest‑P/E stocks.
- Is the S&P 500 overvalued right now?
- What is the S&P 500 P/E ratio today, and where is the money?
- Why is the forward P/E so much lower than the trailing P/E?
- Does a high P/E mean a crash is coming?
- How exposed is your portfolio to the expensive part of the market?
- Is it a bad time to invest in the S&P 500?
Is the S&P 500 overvalued right now?
By most common measures the S&P 500 traded above its long‑run average valuation in October 2026: the 500 largest US stocks were priced at 24.9 times their past year’s earnings on Oct 22, 2026, the forward P/E was 19.0 against a 30‑year average of 17.2, and the Shiller CAPE was 41.08 against a mean of 17.44. History shows high valuations were followed by weaker 10‑year returns, but they were a poor guide to the next year.
“Overvalued” depends on the yardstick, so here are the main ones side by side. A P/E ratio divides price by earnings; the forward P/E uses analysts’ estimates for the next 12 months; the CAPE divides price by 10 years of inflation‑adjusted earnings.
| Measure | Latest | Long-run average | Source and date |
|---|---|---|---|
| Trailing P/E, 500 largest US stocks (profitable companies) | 24.9 | — | Exent’s data, Oct 22, 2026 |
| Trailing P/E, S&P 500 (as reported) | 26.47 | 16.24 (since 1871) | multpl.com, Oct 21, 2026 |
| Forward P/E, S&P 500 | 19.0 | 17.2 (30 years) | J.P. Morgan, Sep 30, 2026 |
| Shiller CAPE | 41.08 | 17.44 (since 1871) | multpl.com, Oct 21, 2026 |
| Dividend yield, S&P 500 | 1.4% | 2.0% (30 years) | J.P. Morgan, Sep 30, 2026 |
Sources: multpl.com Shiller P/E and S&P 500 P/E, both built on Robert Shiller’s data; J.P. Morgan Guide to the Markets, U.S., 4Q 2026. Every measure points the same way; only the size of the premium differs. The forward P/E sat about 10% above its average, the CAPE more than twice its mean. Even against its own 30‑year average of 28.9, which includes the dot‑com years, the CAPE stood at 40.9 on Sep 30, 2026 (J.P. Morgan).
What is the S&P 500 P/E ratio today, and where is the money?
The 500 largest US stocks traded at 24.9 times trailing earnings on Oct 22, 2026, or 26.5 if company losses are netted against profits. We built this table from Exent’s data to show where that valuation sits:
| Group | Share of value | Share of profits | P/E, profitable companies | P/E, losses netted |
|---|---|---|---|---|
| All 500 | 100% | 100% | 24.9 | 26.5 |
| 10 largest | 38.9% | 37.5% | 26.5 | 26.5 |
| Other 490 | 61.1% | 62.5% | 23.9 | 26.5 |
| Group | All 500 | 10 largest | Other 490 |
|---|---|---|---|
| Share of value | 100% | 38.9% | 61.1% |
| Share of profits | 100% | 37.5% | 62.5% |
| P/E, profitable companies | 24.9 | 26.5 | 23.9 |
| P/E, losses netted | 26.5 | 26.5 | 26.5 |
Method: the 500 largest US‑listed common stocks by market value, one share class per company, a close stand‑in for the S&P 500 but not its official list. The group P/E is combined market value divided by combined trailing 12‑month earnings, the way index providers aggregate, so one extreme ratio cannot distort it. 33 companies with losses (2.7% of the value) are left out of the first P/E column. Prices are from the close before the Oct 22, 2026 snapshot.
The median profitable company traded at 24.8 times earnings, and companies above 30 times earnings made up 38.9% of the group’s value. The giants are not uniformly expensive:
| 10 largest companies | Share of the 500’s value | Trailing P/E |
|---|---|---|
| NVIDIA (NVDA) | 7.2% | 27.9 |
| Apple (AAPL) | 6.9% | 39.3 |
| Alphabet (GOOGL) | 5.7% | 16.4 |
| Microsoft (MSFT) | 5.4% | 29.6 |
| Amazon.com (AMZN) | 3.9% | 20.8 |
| Meta Platforms (META) | 2.5% | 23.5 |
| Broadcom (AVGO) | 2.2% | 41.9 |
| Tesla (TSLA) | 2.0% | 327.5 |
| Eli Lilly (LLY) | 1.6% | 42.5 |
| Berkshire Hathaway (BRK.B) | 1.6% | 13.6 |
Analysts’ forward estimates tell a similar story. J.P. Morgan put the top 10 at 20.9 times next‑year earnings on Sep 30, 2026, right at their average since 1996 of 20.8, and the remaining companies at 17.9, which is 12% above their average of 16.0. The premium is spread across the index, not only in the Magnificent 7. For the history of that concentration, see is the S&P 500 too concentrated.
Why is the forward P/E so much lower than the trailing P/E?
Because analysts expect earnings to grow quickly. Consensus estimates in J.P. Morgan’s guide put S&P 500 earnings per share at $362 for 2026 and $417 for 2027. Divide today’s price by those higher future profits and the ratio drops from the mid‑20s to about 19.
If those profits arrive, the market is less stretched than trailing numbers suggest. If they fall short, the forward P/E was flattering. Neither number is a forecast of prices; they describe what investors are paying today for earnings that are known, and for earnings that are hoped for.
Does a high P/E mean a crash is coming?
No, not on any schedule. High valuations were followed by weak decades, but the following year was close to a coin toss. The table sets the Shiller CAPE in January against the S&P 500’s total return that year and over the next 10 years:
| January of | Shiller CAPE | S&P 500 that year | Next 10 years, per year |
|---|---|---|---|
| 1999 | 40.57 | +20.9% | −1.4% (1999–2008) |
| 2000 | 43.77 | −9.0% | −1.0% (2000–2009) |
| 2009 | 15.17 | +25.9% | +13.0% (2009–2018) |
| 2015 | 26.49 | +1.4% | +13.0% (2015–2024) |
| 2016 | 24.21 | +11.8% | +14.7% (2016–2025) |
| 2021 | 34.51 | +28.5% | Known in 2031 |
| 2022 | 36.94 | −18.0% | Known in 2032 |
| 2025 | 37.14 | +17.8% | Known in 2035 |
CAPE values from multpl.com’s monthly table (Shiller data). Annual returns including dividends from NYU Stern (Aswath Damodaran), updated Jan 5, 2026; the 10‑year figures are our calculation from them. Past returns, not a forecast.
Three lessons stand out. A CAPE above 40 came before a lost decade, yet the market still rose 20.9% in 1999. Readings well above the long‑run mean in 2015 and 2016 were still followed by strong decades, so the average is not a magnet. And market peaks came at very different prices: J.P. Morgan lists forward P/Es of 25.2 at the March 2000 peak, 15.1 at the October 2007 peak (below average), 19.2 in February 2020 and 21.4 in January 2022.
Research agrees. AQR’s Market Timing: Sin a Little (Asness, Ilmanen and Maloney, 2017) found that valuation measures predicted long‑horizon returns, but that timing the market with them gave weak results out of sample. More on this in does market timing work and are we in a bubble.
How exposed is your portfolio to the expensive part of the market?
More than the label “index fund” suggests. A fund that tracks the S&P 500, such as SPY, puts roughly 38.9% of each dollar into 10 companies. Add a Nasdaq‑100 fund or a few of the same giants held directly and the share climbs fast.
Illustrative: $600,000 in stocks, $400,000 in an S&P 500 fund and $200,000 split across three of the 10 largest companies. About $355,436, or 59.2% of the stock money, rides on 10 companies.
That matters because expensive, concentrated markets have fallen hard before. In the same data, SPY fell −25.4% in the 2022 bear market and −34.1% in the 2020 crash, while the Nasdaq‑100 fund QQQ fell −34.6% in 2022. A weekend check:
- Add up your exposure to the 10 largest companies across every fund and single stock you own.
- Work out your own portfolio P/E: total value divided by the sum of each holding’s value divided by its P/E.
- Note how much sits in companies trading above 30 times earnings, or losing money.
- Price the bad case in dollars: what a 25% to 35% fall would cost, and whether you could hold through it.
- Compare with an equal‑weight fund such as RSP, which spreads the index evenly across its members.
The equal weight vs cap weight guide and is the rally too narrow cover the trade‑offs of spreading out.
Is it a bad time to invest in the S&P 500?
Valuations alone have not answered that question well. They have pointed to lower long‑run returns on average, which is why published 10‑year forecasts sit well below the last decade’s returns; we collect them in what return to expect from the S&P 500.
For long‑term money, waiting has usually cost more than it saved. Investing a lump sum in the S&P 500 beat spreading it over 12 months in 84.8% of 112 rolling windows since 2016 in our data. Your horizon, cash reserve and the loss you can live with matter more than the P/E. See is it a good time to invest and lump sum vs dollar‑cost averaging.
How to follow valuations and the backdrop with Exent
- Market intel publishes a daily macro regime score, Risk ON, Neutral or Risk OFF, that reads four pillars: liquidity, credit stress, the economic cycle and sentiment.
- Members get an alert when the regime changes, plus a daily briefing with cited sources, an events calendar, cross‑asset signals and the Magnificent 7 against the other 493.
- Portfolio Analysis shows your concentration and replays your holdings through the 2008, 2020, 2022 and 2025 selloffs; upload a screenshot, CSV, Excel, PDF or Google Sheet, no brokerage login.
Frequently asked questions
By most common measures it trades above its long-run average. The 500 largest US stocks were at 24.9 times trailing earnings on Oct 22, 2026 in Exent’s data, the forward P/E was 19.0 against a 30-year average of 17.2 on Sep 30, 2026, and the Shiller CAPE was 41.08 on Oct 21, 2026.
About 24.9 on trailing earnings for the 500 largest US stocks on Oct 22, 2026 (26.5 with losses netted), per Exent’s data. multpl.com showed 26.47 for the index on Oct 21, 2026, and J.P. Morgan put the forward P/E at 19.0 on Sep 30, 2026.
Not on its own. The CAPE was above 40 in January 1999 and the S&P 500 still rose 20.9% that year, while the 2007 peak came at a below-average forward P/E of 15.1. High valuations have been followed by weaker 10-year returns, not by crashes on a timetable.
Valuations have not been a reliable timing signal. In Exent’s data, a lump sum beat spreading the money over 12 months in 84.8% of rolling windows since 2016. Your horizon and how much loss you can sit through matter more.
It depends on the measure. The trailing P/E averaged 16.24 since 1871 and the Shiller CAPE 17.44 (multpl.com), while the forward P/E averaged 17.2 over the 30 years to Sep 30, 2026 (J.P. Morgan).
Partly. The 10 largest companies traded at 26.5 times earnings vs 23.9 for the other profitable companies on Oct 22, 2026, but J.P. Morgan’s forward numbers show the rest of the index further above its own history than the top 10.
Know when to hold the index, and when to step aside.
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Educational content, not investment advice. Examples are illustrative; past performance does not guarantee future results.