Intelligence Feed event · Macro · 2026-10-13

    S&P 500 CAPE Ratio Reaches 41 Following 21% Annual Four-Year Expansion

    Question

    S&P 500 CAPE Ratio Reaches 41 Following 21% Annual Four-Year Expansion

    Direct answer

    Historical equity valuation metrics show that the S&P 500 is trading at its third highest multiple in 156 years. The cyclically adjusted P/E ratio near 41 highlights significant multiple expansion accompanying recent annual gains. Four consecutive years of 21% annualized index appreciation have doubled long-term historical norms, compressing forward equity risk premia across large-cap US equities.

    Original publisher
    Market Ontology
    Evidence through
    2026-10-13
    Published
    2026-10-20
    Revision
    1 · 2026-10-20

    Cite as: Market Ontology, “S&P 500 CAPE Ratio Reaches 41 Following 21% Annual Four-Year Expansion”, revision 1, evidence through 2026-10-13. https://marketontology.com/market-events/2026-10-13/s-p-500-cape-ratio-reaches-41-following-21-annual-four-year-expansion-49f8ab

    MACRO
    S&P 500 CAPE Ratio Reaches 41 Following 21% Annual Four-Year Expansion
    Historical equity valuation metrics show that the S&P 500 is trading at its third highest multiple in 156 years. The cyclically adjusted P/E ratio near 41 highlights significant multiple expansion accompanying recent annual gains. Four consecutive years of 21% annualized index appreciation have doubled long-term historical norms, compressing forward equity risk premia across large-cap US equities.
    SPY
    Impact
    82
    OCT 13
    SIG
    85%
    SPY
    S&P 500 CAPE Ratio Reaches 41 Following 21% Annual Four-Year Expansion
    Historical equity valuation metrics show that the S&P 500 is trading at its third highest multiple in 156 years. The cyclically adjusted P/E ratio near 41 highlights significant multiple expansion accompanying recent annual gains. Four consecutive years of 21% annualized index appreciation have doubled long-term historical norms, compressing forward equity risk premia across large-cap US equities.
    → Extended valuation multiples increase the vulnerability of the S&P 500 index to equity risk premium repricing upon any deceleration in aggregate earnings growth.
    Impact
    Historical equity valuation metrics show that the S&P 500 is trading at its third highest multiple in 156 years. The cyclically adjusted P/E ratio near 41 highlights significant multiple expansion accompanying recent annual gains. Four consecutive years of 21% annualized index appreciation have doubled long-term historical norms, compressing forward equity risk premia across large-cap US equities.
    Affected
    SPY
    Transmission
    Extended valuation multiples increase the vulnerability of the S&P 500 index to equity risk premium repricing upon any deceleration in aggregate earnings growth.

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    SPYequity risk premium compression from multi-decade high CAPE ratioWatch1-3mSource explicitly identifies S&P 500 CAPE ratio reaching nearly 41.

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    What happened next

    AssetCallBase close+1 day+5 days+20 days
    SPYWatch778.01 2026-10-13-1.08%PendingPending

    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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