Stock Market Glossary
Delta
Option metric that approximates how an option reacts to a move in its underlying asset.
In brief: option/">Option metric that approximates how an option reacts to a move in its underlying asset.
Meaning in practice
A delta of 0.50 means, in simplified terms, that an option price moves by roughly half a small move in the underlying. Delta changes with price, time to expiry and volatility, so it is not a fixed leverage figure.
Context for investors and traders
For traders, this term is most useful when preparing and executing an order. Its meaning depends on the venue, liquidity, time frame and order type. A single reading is not a reliable buy or sell decision.
How to use this in practice
Use the term first to describe the situation and add verifiable data: time frame, benchmark, costs and liquidity. Only then does it become an assessment that can be connected to an investment objective and risk budget.
What to keep in mind
Avoid false precision. Many market terms describe probabilities or historical patterns; they neither guarantee a return nor replace the review of a specific security.
