• Delta expresses the amount of change in the price of a derivative instrument depending on the price of the underlying security (for example, shares).

  • Delta can be positive or negative, from 0 to 1 for a call option and from 1 to 0 for a put option.
  • Delta spread is an options trading strategy in which the trader initially establishes a delta-neutral position by simultaneously buying and selling options in proportion to the neutral ratio.
  • The most common tool for implementing the delta spread strategy is the calendar spread, which involves building a delta-neutral position using options with different expiration dates.