An options contract is a derivative instrument that grants the buyer a right without imposing an obligation. The seller (writer) of the option receives a premium and is obligated to fulfil the contract if the buyer exercises.
Types of Options
- Call Option: Right to buy the underlying at the strike price. Profitable when spot price rises above strike + premium.
- Put Option: Right to sell the underlying at the strike price. Profitable when spot price falls below strike − premium.
Moneyness
- In-the-Money (ITM): Call when spot > strike; Put when spot < strike.
- At-the-Money (ATM): Spot ≈ Strike price.
- Out-of-the-Money (OTM): Call when spot < strike; Put when spot > strike.
Option Value
Option Premium = Intrinsic Value + Time Value
Intrinsic value = max(0, S − K) for calls; max(0, K − S) for puts.