S&P 500 CAPE Ratio Crosses 40; Only Second Time in 150 Years
Question
S&P 500 CAPE Ratio Crosses 40; Only Second Time in 150 Years
Direct answer
Mean reversion risk in equity risk premium. — bearish pressure on SPY via valuation compression.
- Original publisher
- Market Ontology
- Evidence through
- 2026-06-16
- Published
- 2026-10-20
- Revision
- 1 · 2026-10-20
Cite as: Market Ontology, “S&P 500 CAPE Ratio Crosses 40; Only Second Time in 150 Years”, revision 1, evidence through 2026-06-16. https://marketontology.com/catalysts/2026-06-16/s-p-500-cape-ratio-crosses-40-only-second-time-in-150-years-27e5a2
| Asset | Direction | Timeframe | Channel | Score |
|---|---|---|---|---|
| SPY | ▼Bear | 1–3 months | valuation compression | 66 |
S&P 500 CAPE Ratio Crosses 40; Only Second Time in 150 Years
Mean reversion risk in equity risk premium. — bearish pressure on SPY via valuation compression.
CAPE ratio crossed 40, matching 1999 levels.
- SourceCAPE ratio crossed 40, matching 1999 levels.
- TransmissionMean reversion risk in equity risk premium.
- SummaryValuations are at historic extremes. AI-driven earnings growth is the primary differentiator from 1999. Market remains vulnerable to any earnings or rate shocks.
- SPYDirect directional or hedged short
- SPY put spreadDefined-risk expression with capped premium outlay
Illustrative, not advice
- Crowded positioning may already reflect the move
- Counter-catalyst could neutralize the thesis before window closes
- SPY closes above pre-catalyst level on rising volume
- Catalyst narrative is officially walked back or contradicted
- Cross-asset confirmation (rates / FX / vol) reverses direction
- SPY price vs. pre-event level
- SPY volume vs. 20-day average
What happened next
| Asset | Call | Base close | +1 day | +5 days | +20 days |
|---|---|---|---|---|---|
| SPY | Bearishdisagreed | 750.33 2026-06-16 | -1.25% | -2.28% | +0.05% |
Closing prices from stored daily bars; returns measured from the last close on or before the event date. Not a recommendation.
Sources
- The Stock Market Just Passed a Threshold · news · 2026-06-16
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