CNN's composite index that measures market sentiment using 7 factors, ranging from 0 (extreme fear) to 100 (extreme greed). Components: Stock price momentum (S&P 500 vs 125-day MA), stock price strength (52-week highs vs lows), stock price breadth (volume), put/call ratio, junk bond demand, market volatility (VIX), safe haven demand. • 0–25: Extreme fear — potential contrarian buy signal • 25–45: Fear • 45–55: Neutral • 55–75: Greed • 75–100: Extreme greed — overheating warning Quantifies Warren Buffett's principle of 'being greedy when others are fearful.' Extreme readings often precede reversals.