INDICATOR EXPLAINER · #01
The VIX — the market's "fear gauge"
How BATS interprets the VIX, and what 36 years of daily history tell us about using it to answer "is now a good time to buy stocks?"
Today's reading
Same number you'll see on this component's card on the main dashboard.
What is the VIX?
The VIX is a real-time number published by the Chicago Board Options Exchange (Cboe). It estimates how much investors expect the S&P 500 to move over the next 30 days, based on the prices they're paying for S&P 500 options.
Traders call it the "fear gauge" because it tends to spike when the market is falling and investors are rushing to buy options for protection.
Key VIX thresholds traders watch
- Under 12 Extreme calm, market is confident
- 12 – 15 Calm, "bull market" zone
- 15 – 20 Long-term average / baseline
- 20 – 25 Slightly elevated, cautious
- 25 – 35 Nervous market
- 35 – 45 Heavy fear
- Over 45 Panic; historically a strong contrarian buy signal
How BATS uses the VIX
The VIX is a contrarian indicator. When the crowd is scared (high VIX), history says stocks are usually cheap. When the crowd is complacent (low VIX), stocks are typically climbing calmly.
BATS converts the raw VIX value into a 0–100 sentiment score using a piecewise linear scale, then maps that score into one of the seven sentiment buckets:
| VIX range | BATS points | Bucket |
|---|---|---|
| Under 12 | 85 – 92 | Extended |
| 12 – 15 | 67 – 86 | Bullish → Slightly Bullish |
| 15 – 20 | 43 – 67 | Baseline / Neutral |
| 20 – 25 | 28 – 43 | Slightly Bearish |
| 25 – 35 | 14 – 28 | Oversold |
| 35 – 45 | 5 – 14 | Extremely Oversold |
| Over 45 | 2 – 5 | Extremely Oversold (panic) |
Does it work? — Historical backtest (1990–2026)
For every trading day since 1990, we compute the VIX component of the BATS from that day's VIX reading and measure how the S&P 500 actually performed 6 and 12 months later.
What the data actually says
Three findings jump out of the 36-year backtest — some validating conventional wisdom, some challenging it:
The contrarian thesis works — dramatically.
When BATS reads Very Oversold (VIX above 35), the S&P 500 was up an average of +28% over the next 12 months, and positive 93% of the time. That's roughly triple the baseline forward return of ~+10%.
Takeaway: When the crowd is truly panicking, history says the odds heavily favor patient buyers.
"Slightly Bearish" is a dud zone.
When the VIX sits in the 20–25 range — nervous but not panicked — forward 12-month returns average only +5%, worse than any other bucket. Elevated fear without full capitulation has historically been the weakest window to buy.
Takeaway: Wait for either a full flush (VIX above 25) or a return to baseline (VIX under 20) — the middle can be a trap.
Low VIX is not, by itself, a sell signal.
Extended readings (VIX under 12) delivered +10% average 12-month returns — right at baseline. The old wisdom that "complacency means take profits" is not supported by 36 years of data. Sustained calm has coincided with continued bull markets.
Takeaway: Don't sell just because things are calm. Look for confirmation from other indicators before drawing conclusions.
How to use this information
The VIX is a powerful tool, but no single indicator should drive an investment decision. Here's how to read the BATS VIX signal in a balanced way:
- Treat extreme readings as significant. When the VIX spikes above 35, history is heavily on the side of patient buyers over the next 6–12 months. That doesn't mean the market can't fall further first — bottoms are rarely single-day events.
- Be patient in the 20–25 zone. When the market is nervous but hasn't fully panicked, forward returns have been the weakest. Wait for capitulation or a return to baseline before committing capital.
- Don't sell just because things are calm. Low VIX doesn't predict a top on its own. The one caveat: pair it with other indicators (breadth, momentum, valuation) before drawing conclusions.
- Combine, don't isolate. The VIX is one signal. BATS is designed to blend it with other indicators so each can filter the others' false alarms. The main gauge on the dashboard is the blended view.
- Match your time horizon. These returns are 6 and 12 months forward. If you're trading day-to-day or week-to-week, the same signal looks much noisier.
Reminder: None of this is investment advice. Historical patterns are not guarantees. Always do your own research or talk to a financial professional before investing.