Glossary Detail: Delta
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Backtesting Delta on High-Beta Names
Measures how much an option's price changes per $1 move in the underlying. Also approximates the probability of expiring in-the-money.
Further Details:
Delta measures the rate of change of an option's price relative to a $1 change in the underlying asset. Call deltas range from 0 to 1.0; put deltas from -1.0 to 0. An ATM call has a delta of approximately 0.50, meaning it gains ~$0.50 per $1 stock move.