Intelligence Feed event · Equity · 2026-09-06

    S&P 500 Shiller CAPE Ratio Reaches 41, Matching Historic Valuation Peaks

    Question

    S&P 500 Shiller CAPE Ratio Reaches 41, Matching Historic Valuation Peaks

    Direct answer

    The S&P 500 Shiller CAPE ratio has touched 41, matching levels recorded during the dot-com bubble peak. This reading reflects significant multiple expansion across large-cap equities over the preceding cycle. With equity risk premiums compressed against prevailing Treasury yields, unexpected inflation pressure from tariffs or energy supply constraints creates downside risk to trailing valuation multiples.

    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 Historic Valuation Peaks”, revision 1, evidence through 2026-09-06. https://marketontology.com/market-events/2026-09-06/s-p-500-shiller-cape-ratio-reaches-41-matching-historic-valuation-peaks-a166f2

    EQUITY
    S&P 500 Shiller CAPE Ratio Reaches 41, Matching Historic Valuation Peaks
    The S&P 500 Shiller CAPE ratio has touched 41, matching levels recorded during the dot-com bubble peak. This reading reflects significant multiple expansion across large-cap equities over the preceding cycle. With equity risk premiums compressed against prevailing Treasury yields, unexpected inflation pressure from tariffs or energy supply constraints creates downside risk to trailing valuation multiples.
    SPYTLT
    Impact
    69
    SEP 6
    SIG
    82%
    SPYTLT
    S&P 500 Shiller CAPE Ratio Reaches 41, Matching Historic Valuation Peaks
    The S&P 500 Shiller CAPE ratio has touched 41, matching levels recorded during the dot-com bubble peak. This reading reflects significant multiple expansion across large-cap equities over the preceding cycle. With equity risk premiums compressed against prevailing Treasury yields, unexpected inflation pressure from tariffs or energy supply constraints creates downside risk to trailing valuation multiples.
    → A CAPE multiple of 41 compresses the equity risk premium relative to nominal Treasury yields, amplifying multiple contraction risk on macro shocks.
    Impact
    The S&P 500 Shiller CAPE ratio has touched 41, matching levels recorded during the dot-com bubble peak. This reading reflects significant multiple expansion across large-cap equities over the preceding cycle. With equity risk premiums compressed against prevailing Treasury yields, unexpected inflation pressure from tariffs or energy supply constraints creates downside risk to trailing valuation multiples.
    Affected
    SPYTLT
    Transmission
    A CAPE multiple of 41 compresses the equity risk premium relative to nominal Treasury yields, amplifying multiple contraction risk on macro shocks.

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    SPYequity risk premium compression on elevated cyclically adjusted multiplesDown1-3mShiller CAPE reaches 41, trailing historical extreme thresholds
    TLTcross-asset safe haven demand versus duration discount rate riskMixed1-4wTreasury debt issuance dynamics interacting with elevated equity multiples

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    What happened next

    AssetCallBase close+1 day+5 days+20 days
    SPYDowndisagreed770.19 2026-09-04-0.55%-1.21%+0.60%
    TLTMixed82.21 2026-09-04-0.01%-1.56%-6.20%

    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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