Intelligence Feed event · Macro · 2026-09-18

    S&P 500 CAPE ratio reaches 41, matching historical extremes seen in 1929 and 1999

    Question

    S&P 500 CAPE ratio reaches 41, matching historical extremes seen in 1929 and 1999

    Direct answer

    The S&P 500 CAPE ratio has climbed to 41 following three consecutive years of double-digit percentage gains. Historically, this level of aggregate multiple expansion has preceded protracted periods of mean reversion. With risk-free sovereign debt yielding 5.00%, the equity risk premium has compressed, increasing downside vulnerability to any earnings or macro guidance revisions.

    Original publisher
    Market Ontology
    Evidence through
    2026-09-18
    Published
    2026-10-20
    Revision
    1 · 2026-10-21

    Cite as: Market Ontology, “S&P 500 CAPE ratio reaches 41, matching historical extremes seen in 1929 and 1999”, revision 1, evidence through 2026-09-18. https://marketontology.com/market-events/2026-09-18/s-p-500-cape-ratio-reaches-41-matching-historical-extremes-seen-in-1929-and-1999-59521a

    MACRO
    S&P 500 CAPE ratio reaches 41, matching historical extremes seen in 1929 and 1999
    The S&P 500 CAPE ratio has climbed to 41 following three consecutive years of double-digit percentage gains. Historically, this level of aggregate multiple expansion has preceded protracted periods of mean reversion. With risk-free sovereign debt yielding 5.00%, the equity risk premium has compressed, increasing downside vulnerability to any earnings or macro guidance revisions.
    QQQGLD
    Impact
    83
    SEP 18
    SIG
    85%
    QQQGLD
    S&P 500 CAPE ratio reaches 41, matching historical extremes seen in 1929 and 1999
    The S&P 500 CAPE ratio has climbed to 41 following three consecutive years of double-digit percentage gains. Historically, this level of aggregate multiple expansion has preceded protracted periods of mean reversion. With risk-free sovereign debt yielding 5.00%, the equity risk premium has compressed, increasing downside vulnerability to any earnings or macro guidance revisions.
    → Elevated valuation multiples at 41x cyclically adjusted earnings reduce equity risk premia relative to 5.00% risk-free Treasury yields.
    Impact
    The S&P 500 CAPE ratio has climbed to 41 following three consecutive years of double-digit percentage gains. Historically, this level of aggregate multiple expansion has preceded protracted periods of mean reversion. With risk-free sovereign debt yielding 5.00%, the equity risk premium has compressed, increasing downside vulnerability to any earnings or macro guidance revisions.
    Affected
    QQQGLD
    Transmission
    Elevated valuation multiples at 41x cyclically adjusted earnings reduce equity risk premia relative to 5.00% risk-free Treasury yields.

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    QQQequity multiple compression against 5% sovereign yield hurdleDown1-3mAggregate index valuation of 41x CAPE leaves minimal buffer for earnings disappointments.
    GLDdefensive asset allocation hedging equity valuation drawdownUp1-3mHistorical multiple mean-reversions drive capital reallocation into alternative reserves.

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    What happened next

    AssetCallBase close+1 day+5 days+20 days
    GLDUpdisagreed401.17 2026-09-18-0.70%-1.93%-4.78%
    QQQDowndisagreed721.45 2026-09-18+2.77%+3.19%Pending

    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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