Markets are driven by numbers, but they are moved by people, and people swing between fear and greed. The Fear and Greed Index is an attempt to put a single score on that mood. It is popular with retail traders and often quoted in the financial press, so it is worth understanding what it measures and, just as importantly, what it does not.
What the index is
The best-known version is published by CNN Business. It produces a score from 0 to 100, where readings near zero signal extreme fear and readings near 100 signal extreme greed. A score around 50 is neutral. The index looks only at the US stock market, so it is a gauge of American investor sentiment rather than global mood.
The seven signals behind it
The score combines seven indicators, each measuring a different side of investor behaviour. Market momentum compares the S&P 500 with its 125-day moving average. Stock price strength looks at how many shares are hitting 52-week highs versus lows. Stock price breadth measures trading volume in rising shares against falling ones. The put and call options ratio shows whether traders are buying more protection or more upside bets. Junk bond demand looks at the extra yield investors want for riskier corporate debt. Market volatility tracks the VIX. Safe haven demand compares returns on shares with returns on Treasuries.
Each indicator is scored against its own recent history and the results are averaged. That makes the index a blend of price action, positioning and risk appetite rather than a survey of how people feel.
How traders use it
Most professional investors read the index as a contrarian signal. When the gauge sits in extreme fear, it suggests a lot of bad news is already reflected in prices, and selling may be close to exhausted. When it shows extreme greed, it suggests investors are complacent and the market may be vulnerable to a disappointment. Warren Buffett’s line about being fearful when others are greedy and greedy when others are fearful captures the idea.
In October 2026, for example, the index slipped into extreme fear territory around 20 as technology shares sold off on worries about AI spending and oil prices climbed above $110 a barrel. Readings like that do not tell you the low is in, but they do tell you sentiment is stretched.
The limits you need to know
The index is a description of the present, not a forecast. Markets can stay in extreme fear for weeks during a genuine downturn, and in a strong bull market greed can persist far longer than sceptics expect. Because several of its inputs are based on price moves, it can also simply echo what has already happened: shares have fallen, so the gauge shows fear.
It is also US-centric. A UK trader focused on the FTSE 100, gilts or sterling should treat it as a guide to global risk appetite rather than a direct signal for London markets.
The bottom line
The Fear and Greed Index is a useful temperature check. It helps you see when the crowd is leaning heavily one way and reminds you that extremes rarely last. Used alongside price levels, earnings and the economic calendar, it can stop you selling in a panic or buying at the top of a frenzy. Used on its own, it is just a number. If you want to see how your own decisions hold up when sentiment swings, take the free Samuel & Co Trading Trader Assessment.
