1. Why sentiment matters
Markets are driven by two fuels — fundamentals (slow) and emotion (fast). At every major peak crowds were certain prices would keep rising; at every major trough they were certain the world was ending. Sentiment is the contrarian indicator par excellence: extreme greed warns of tops, extreme fear marks bottoms.
"Be fearful when others are greedy and greedy when others are fearful." — Warren Buffett
2. The investor emotion cycle
Optimism → Excitement → Thrill → Euphoria (point of max financial risk) → Anxiety → Denial → Fear → Desperation → Panic → Capitulation → Despondency (point of max financial opportunity) → Depression → Hope → Relief → Optimism again. The cycle has repeated for 400 years.
3. VIX — the fear gauge
The CBOE Volatility Index (VIX) measures the 30-day implied volatility of S&P 500 options. Mechanical reading:
- VIX < 13 — extreme complacency, often near tops.
- 13–20 — normal regime.
- 20–30 — heightened concern, corrective phase.
- > 30 — fear; historically a buying zone for index investors.
- > 50 — outright panic (2008, March 2020). Contrarian green light.
4. CNN Fear & Greed Index
A composite (0–100) of seven inputs: stock price momentum, breadth, put/call ratio, junk-bond demand, market volatility, safe-haven demand, and stock price strength. Free at cnn.com/markets/fear-and-greed.
| Reading | Label | Interpretation |
|---|---|---|
| 0–24 | Extreme Fear | Historically a 12-month buying signal for SPY |
| 25–44 | Fear | Cautious buying |
| 45–55 | Neutral | No edge |
| 56–74 | Greed | Trim, hedge |
| 75–100 | Extreme Greed | Reduce risk; stop adding |
5. Put/Call ratio
The CBOE Total Put/Call ratio = put volume / call volume.
- > 1.20 — heavy put buying = fear = bullish for contrarians.
- 0.7–1.0 — normal.
- < 0.6 — call frenzy (often retail) = greed = bearish warning.
6. AAII Sentiment Survey
Weekly poll of American Association of Individual Investors members. Three buckets: Bullish, Neutral, Bearish. The Bull−Bear spread is the trader's number. Spreads above +30% historically precede sub-par 12-month returns; spreads below −20% have been excellent buy signals.
7. Market breadth
- Advance/Decline line — running cumulative of (advancing − declining) NYSE issues. Healthy bull markets see A/D making new highs alongside the index. Divergence (index up, A/D flat) is a late-cycle warning.
- % of stocks above 200-day MA — above 70% = strong; below 20% = washout.
- New 52-week highs vs lows — narrowing leadership precedes corrections.
8. News & social sentiment
- X (Twitter) — search "SPX" or a ticker; gauge ratio of bull vs bear posts. Tools: stocktwits.com.
- Reddit r/wallstreetbets — extreme bullish call-buying chatter on a single name often marks short-term tops (GME, AMC, NVDA).
- Google Trends — search "buy stocks" spike historically marks tops; "stock market crash" spike marks bottoms.
- Magazine cover indicator — when a bull (or bear) market hits the cover of TIME or The Economist, the move is usually mature.
9. Insiders & buybacks
Form 4 filings on EDGAR show every insider trade. Cluster buying by multiple officers, especially CEO + CFO together, is a strong bullish signal — they have only one reason to buy. Insider selling is noisier (taxes, diversification) but a sudden surge by founders can flag tops.
Aggregate S&P 500 buyback authorizations (~$1T annually 2023–24) are a flow tailwind for the index.
10. Contrarian sentiment checklist
- VIX above 30 AND F&G below 20? Aggressive buy zone.
- Put/Call > 1.2 AND AAII bears > 50%? Capitulation likely close.
- VIX below 13 AND F&G above 80 AND breadth narrowing? Trim, raise cash.
- Magazine cover screaming "Death of Equities" or "Best Time to Invest"? Inversion likely within 12 months.
- Always overlay sentiment on top of trend & valuation — never trade sentiment alone.