A doubling of the VIX in 5 trading days is one of the cleanest fear-spike signals. It captures sudden regime changes: Lehman week, COVID week, August 2011 US downgrade, August 2015 China devaluation, February 2018 Volmageddon.
ALAN INTELLIGENCE
ALAN INTELLIGENCE · alanglobalintelligence.com
ALAN IntelligenceData as of 2026-08-30
Every historical instance, overlaid — S&P 500 forward path from the event
Each instance (n=7)Median path25th-75th percentileCurrent: 2025
Median forward returns by horizon
Bars: median S&P 500 forward return. Whiskers: 25th-75th percentile. n = 7 occurrences.
Based on 7 historical occurrences. Last triggered: 2025-04-04.
Past performance is not indicative of future results. This material is for informational and educational purposes only and does not constitute investment advice, an offer to buy or sell any security, or a recommendation. Data from publicly available sources believed to be reliable but not guaranteed. All investments involve risk, including possible loss of principal.
alanglobalintelligence.com
ALAN GLOBAL INTELLIGENCE · alanglobalintelligence.comSource: CBOE VIX Index · Generated 2026-08-30
Historical occurrencesshowing 7 of 7
Date
1M return
1Y return
5Y return
2011-08-08
+7.1%
+25.2%
+94.3%
2015-08-21
-1.4%
+10.7%
+74.1%
2018-02-05
+2.9%
+3.1%
+57.2%
2020-02-27
-14.7%
+27.9%
+94.0%
2024-08-05
+6.4%
+22.2%
—
2024-12-18
+3.6%
+17.1%
—
2025-04-04
+10.5%
+33.7%
—
What history says
Editorial commentary written by ALAN analysts. Figures cited below are analyst-authored context — they are not derived from the chart above and may reflect different windows or sources.
The velocity of the spike matters more than the level
A VIX doubling from 12 to 24 triggers this signal at a lower absolute level than VIX 30. The speed of the move is what dislocates positioning and creates opportunity.
Forced selling creates mispricing
When VIX doubles, volatility-targeting strategies, risk-parity funds, and CTA trend-followers all sell equities simultaneously. This mechanical selling overshoots fundamental value.
Forward returns are excellent at every horizon
Median 6-month return after a VIX doubling event exceeds +12%. The signal has no false positives (zero negative 12-month returns) in the available history.
For your portfolio
Because a VIX doubling reflects mechanical selling — volatility-targeting and trend-following funds unloading in unison — the dislocation is about positioning, not fundamentals, so lean on your plan rather than re-underwriting your holdings. A useful cross-check is credit conditions: if those stay calm while stocks gap down, history favors rebalancing into the weakness.
For information and research only. Not investment advice. ALAN does not place trades or execute orders. Figures come from the sources shown and can lag the market; verify independently before making decisions. Past performance is not predictive of future results.
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ALAN is not a broker-dealer or investment advisor. All data is informational only and does not constitute investment advice. Past performance does not guarantee future results.