Intelligence Feed event · Equity · 2026-07-09

    S&P 500 Shiller CAPE Ratio Surpasses 41, Signaling Overvaluation

    Question

    S&P 500 Shiller CAPE Ratio Surpasses 41, Signaling Overvaluation

    Direct answer

    The Shiller CAPE ratio, which adjusts earnings for inflation over a 10-year period, suggests the market is significantly overvalued relative to historical norms. The current reading of 41 matches the peak seen in the late 1990s. While AI-driven growth in mega-cap tech has supported these levels, the concentration risk and valuation stretch increase sensitivity to macro shocks or earnings misses.

    Original publisher
    Market Ontology
    Evidence through
    2026-07-09
    Published
    2026-10-20
    Revision
    1 · 2026-10-20

    Cite as: Market Ontology, “S&P 500 Shiller CAPE Ratio Surpasses 41, Signaling Overvaluation”, revision 1, evidence through 2026-07-09. https://marketontology.com/market-events/2026-07-09/s-p-500-shiller-cape-ratio-surpasses-41-signaling-overvaluation-1eb9e1

    EQUITY
    S&P 500 Shiller CAPE Ratio Surpasses 41, Signaling Overvaluation
    The Shiller CAPE ratio, which adjusts earnings for inflation over a 10-year period, suggests the market is significantly overvalued relative to historical norms. The current reading of 41 matches the peak seen in the late 1990s. While AI-driven growth in mega-cap tech has supported these levels, the concentration risk and valuation stretch increase sensitivity to macro shocks or earnings misses.
    SPY
    Impact
    95
    JUL 9
    SIG
    90%
    SPY
    S&P 500 Shiller CAPE Ratio Surpasses 41, Signaling Overvaluation
    The Shiller CAPE ratio, which adjusts earnings for inflation over a 10-year period, suggests the market is significantly overvalued relative to historical norms. The current reading of 41 matches the peak seen in the late 1990s. While AI-driven growth in mega-cap tech has supported these levels, the concentration risk and valuation stretch increase sensitivity to macro shocks or earnings misses.
    → Mean reversion risk via equity risk premium compression against historical valuation ceilings.
    Impact
    The Shiller CAPE ratio, which adjusts earnings for inflation over a 10-year period, suggests the market is significantly overvalued relative to historical norms. The current reading of 41 matches the peak seen in the late 1990s. While AI-driven growth in mega-cap tech has supported these levels, the concentration risk and valuation stretch increase sensitivity to macro shocks or earnings misses.
    Affected
    SPY
    Transmission
    Mean reversion risk via equity risk premium compression against historical valuation ceilings.

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    What happened next

    AssetCallBase close+1 day+5 days+20 days
    SPYWatch751.71 2026-07-09+0.43%-0.13%+2.24%

    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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