Market Sentiment: Using Sentiment Indicators Systematically

Three measures have become standard, each with its own data basis:

• Fear & Greed Index: aggregates seven market components (including momentum, put/call ratio, volatility, junk bond spreads) into a 0–100 scale — the mechanics are explained in detail in our Fear & Greed Index article.
• Put/call ratio: measures hedging appetite in the options market. An extreme amount of puts signals fear — historically often near market lows.
• AAII survey: weekly poll of US retail investors on bullish and bearish positioning. Extreme bearishness has historically clustered near market bottoms.

The shared logic: at the extremes, sentiment works as a contrarian indicator. When almost everyone is pessimistic, much of the selling pressure has already played out — and vice versa.

Classic indicators measure market behavior — NLP models measure language. They evaluate news, earnings calls and analyst commentary and condense the tone into a score per stock or sector. The advantage over surveys: real-time coverage, at the single-stock level, without self-reporting bias. That makes it visible when the news flow around a position in your portfolio deteriorates, before broad sentiment gauges pick it up.

MoneyPeak uses exactly this approach, condensing news sentiment per stock into a score within its AI analysis — how that fits into an analysis workflow is covered in our article on AI stock analysis.

Know these three caveats before turning sentiment data into decisions:

• Not a timing instrument: extreme fear can last weeks, extreme greed months. Sentiment says “the market is stressed”, not “it turns tomorrow”.
• The middle is meaningless: readings between the extremes have historically carried little predictive content — most of the time the gauge is simply noise.
• Reflexivity: the more investors trade the same indicator, the weaker its signal becomes.

The sensible use for long-term investors: sentiment as a discipline tool. Extreme greed is a good moment to review concentration risks and valuations in your portfolio — extreme fear is a bad moment for panic selling, not least for tax reasons, since FIFO rules make the oldest (often most profitable) lots taxable first.