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S&P 500 CAPE hits 40.9 – highest since the dot‑com era – signaling no positive three‑year returns historically; see what investors should monitor.
The S&P 500’s cyclically adjusted price‑to‑earnings (CAPE) ratio rose to 40.9 in June, the first monthly reading above 40 since the late‑1990s bubble, and history shows the index has never posted a positive three‑year return after such a level【1】.
| At a glance | |
|---|---|
| CAPE ratio (June) | 40.9 |
| 20‑year CAPE average | 27.6 |
| S&P 500 YTD gain | +8% |
| Historical three‑year return after CAPE > 40 | Negative (0% positive) |
Robert Shiller’s CAPE metric smooths ten years of inflation‑adjusted earnings to strip out cyclical noise. The June reading of 40.9 not only eclipses the 20‑year average of 27.6 but also matches the only prior episode when the index posted a monthly CAPE above 40 – during the dot‑com boom of the late 1990s and early 2000s【1】. The chart referenced in the source shows that, in that earlier episode, the S&P 500 never delivered a positive three‑year return after a CAPE > 40, and a historical average suggests a 30% drop by July 2029 if past patterns repeat【1】.
Despite the lofty valuation, the broader market has continued to climb in 2026, with the S&P 500 up 8% year‑to‑date and the Nasdaq up 7%【1】. Strong corporate earnings underpin the rally: Q1 2026 revenue grew 11.4% and earnings surged 28.6%, the fastest earnings expansion since Q4 2021【1】. Analysts project another 11% revenue gain and 27% earnings growth for the full year, with technology, communications services, and energy sectors expected to lead the upside【1】. Yet the CAPE warning suggests that, if earnings cannot keep pace with price appreciation, the index could face a prolonged downturn.
The June CAPE reading revives a rare warning sign that historically preceded multi‑year market weakness, but whether the current AI‑driven earnings expansion can break that pattern remains uncertain.
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 3 outlets · Aug 4, 2026 · How we report
The index is public‑float‑adjusted capitalization weighted, meaning each component’s weight reflects its float‑adjusted market value.
Information Technology leads with 37.4% of the index, followed by Financials (12.0%) and Communication Services (9.96%).
A committee evaluates eligibility based on criteria such as market capitalization (≥ $22.7 billion), liquidity, profitability, exchange listing, and sector balance.
Since 1926, the index’s compound annual growth rate, including dividends, is approximately 9.8%, with annual gains occurring about 70% of the time.
There are index funds, ETFs (e.g., SPDR S&P 500 ETF Trust), mutual funds, and derivatives such as options and futures that aim to replicate the index’s performance.