What might (sort of) look like an EKG (Electrocardiogram) chart which measures the electrical activity of the heart, is actually the CBOE (Chicago Board of Options Exchange) Put/Call Ratio.
For savvy investors, the CBOE Put/Call Ratio can be used to help gauge market sentiment by comparing the number of traded Put options as compared to the number of traded Call options.
What are Put and Call options?
They are collectively part of a group of securities called derivative instruments.
Put options give the holder the right to sell an asset at a specific price within a certain timeframe. Investors often buy puts when they believe the market, or a specific stock, is going to decline. Put options are also used as a hedging tool.
Call options give the holder the right to buy an asset at a specific price. Investors purchase calls when they expect the market or a stock to rise.
The put-call ratio shows how many puts are being traded relative to calls. A ratio of 1 means an equal number of puts and calls are being traded.
Interpreting the Put/Call Ratio
High Put/Call Ratio (>1): A higher ratio indicates that more investors are buying puts, expecting a market decline. For example, if the ratio reaches 1.3, this means 1.3 puts are being traded for every call, suggesting investors are largely bearish and putting hedges in place. Extremely high levels can sometimes be seen as a contrarian signal. When too many investors expect a downturn, it can indicate a market bottom, where prices could stabilize or even rise.
Low Put/Call Ratio (<1): A lower ratio can suggest more calls are being bought, reflecting optimism in the market. For instance, a ratio of 0.6 means more calls are being traded, signaling that investors are bullish. Again, extremely low levels could be a contrarian signal, suggesting the market is overly optimistic and may be ripe for a correction.
For example, imagine the stock market has been declining for several weeks, and investors become increasingly pessimistic. The CBOE Put/Call ratio rises to 1.8, indicating that far more puts are being bought than calls. This heightened bearish sentiment might suggest that investors are hedging or speculating on further declines. However, such a high ratio could also be seen as a contrarian indicator, implying that too many investors are expecting bad news and that the market might be nearing a bottom. If the ratio starts falling, signaling more calls being bought, it could suggest a change in sentiment and the potential for a market rebound.
In this way, the Put/Call Ratio offers a window into investor sentiment, and when used in conjunction with other market data, it can provide valuable insights for timing market turns.
-Paul R. Rossi, CFA