Intelligence Feed event · Macro · 2026-09-06

    S&P 500 Shiller CAPE Ratio Reaches 41 Matching Rare Historical Valuation Extremes

    Question

    S&P 500 Shiller CAPE Ratio Reaches 41 Matching Rare Historical Valuation Extremes

    Direct answer

    The S&P 500 Shiller CAPE multiple has reached 41, placing broad equity market valuations in the 99th historical percentile. This multiple has been reached only twice in 155 years of tracking, both instances preceding severe multi-year valuation compressions. With equity multiples pricing in sustained margin expansion, broader index instruments face heightened vulnerability if persistent inflation forces central banks to delay easing or if tariff pressures elevate intermediate input costs.

    Original publisher
    Market Ontology
    Evidence through
    2026-09-06
    Published
    2026-10-20
    Revision
    1 · 2026-10-20

    Cite as: Market Ontology, “S&P 500 Shiller CAPE Ratio Reaches 41 Matching Rare Historical Valuation Extremes”, revision 1, evidence through 2026-09-06. https://marketontology.com/market-events/2026-09-06/s-p-500-shiller-cape-ratio-reaches-41-matching-rare-historical-valuation-extreme-edf624

    MACRO
    S&P 500 Shiller CAPE Ratio Reaches 41 Matching Rare Historical Valuation Extremes
    The S&P 500 Shiller CAPE multiple has reached 41, placing broad equity market valuations in the 99th historical percentile. This multiple has been reached only twice in 155 years of tracking, both instances preceding severe multi-year valuation compressions. With equity multiples pricing in sustained margin expansion, broader index instruments face heightened vulnerability if persistent inflation forces central banks to delay easing or if tariff pressures elevate intermediate input costs.
    SPYQQQ
    Impact
    75
    SEP 6
    SIG
    82%
    SPYQQQ
    S&P 500 Shiller CAPE Ratio Reaches 41 Matching Rare Historical Valuation Extremes
    The S&P 500 Shiller CAPE multiple has reached 41, placing broad equity market valuations in the 99th historical percentile. This multiple has been reached only twice in 155 years of tracking, both instances preceding severe multi-year valuation compressions. With equity multiples pricing in sustained margin expansion, broader index instruments face heightened vulnerability if persistent inflation forces central banks to delay easing or if tariff pressures elevate intermediate input costs.
    → A Shiller CAPE multiple of 41 compresses the equity risk premium over 10Y Treasuries, amplifying downside sensitivity to rate volatility and margin contraction across SPY.
    Impact
    The S&P 500 Shiller CAPE multiple has reached 41, placing broad equity market valuations in the 99th historical percentile. This multiple has been reached only twice in 155 years of tracking, both instances preceding severe multi-year valuation compressions. With equity multiples pricing in sustained margin expansion, broader index instruments face heightened vulnerability if persistent inflation forces central banks to delay easing or if tariff pressures elevate intermediate input costs.
    Affected
    SPYQQQ
    Transmission
    A Shiller CAPE multiple of 41 compresses the equity risk premium over 10Y Treasuries, amplifying downside sensitivity to rate volatility and margin contraction across SPY.

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    SPYequity multiple compression under high valuation percentilesDown1-3mShiller CAPE ratio reaches 41, matching historical extremes from the dot-com era.
    QQQduration-sensitive multiple de-rating from elevated starting multiplesDown1-3mHigh CAPE multiples concentrate valuation risk in mega-cap technology and growth equities.

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    What happened next

    AssetCallBase close+1 day+5 days+20 days
    QQQDowndisagreed718.96 2026-09-04-0.08%-1.36%+5.18%
    SPYDowndisagreed770.19 2026-09-04-0.55%-1.21%+0.60%

    Closing prices from stored daily bars; returns measured from the last close on or before the event date. Not a recommendation.

    No verifiable public source recorded for this card.

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