What Is the Strike Price?
The strike price, also called the exercise price, is the predetermined price at which the buyer of an option contract has the right to buy (in the case of a call option) or sell (in the case of a put option) the underlying asset. The strike price is fixed when the option contract is bought and does not change for the life of the contract. The relationship between the strike price and the current market price determines whether an option is in-the-money, at-the-money, or out-of-the-money.
Call Option Strike Price Logic
- In-the-money (ITM) call: Strike price below current market price. The call has intrinsic value. Example: Call strike 22,000 when Nifty is at 22,300 = Rs 300 intrinsic value per unit.
- At-the-money (ATM) call: Strike at or near current market price. Maximum time value; zero or minimal intrinsic value.
- Out-of-the-money (OTM) call: Strike above current market price. No intrinsic value; only time value. Most OTM calls expire worthless.
Put Option Strike Price Logic
- In-the-money (ITM) put: Strike price above current market price. Has intrinsic value.
- At-the-money (ATM) put: Strike at or near current market price.
- Out-of-the-money (OTM) put: Strike below current market price. No intrinsic value.
How to Choose the Right Strike Price
| Strategy | Strike Selection | Risk Level |
|---|---|---|
| Conservative speculation | ATM or slightly ITM | Moderate |
| Aggressive speculation | OTM (1-2 strikes away) | High (often expires worthless) |
| Portfolio hedging | Near ATM or slightly OTM put | Low (insurance cost) |
| Premium selling (writing) | OTM (reduce probability of being exercised) | Moderate with defined maximum gain |
Strike Price and Premium Relationship
For call options: ITM calls have the highest premium (most intrinsic value); OTM calls have the lowest premium but expire worthless most often. For put options: ITM puts are most expensive; OTM puts are cheapest but provide less protection. The choice of strike price is one of the most critical decisions in options trading as it directly determines the probability of profit and the risk-reward profile.
Key Takeaway
The strike price determines the breakeven point of an options trade and the probability of the option expiring profitably. Selecting the right strike price requires balancing the desired leverage, probability of profit, and risk tolerance. Use the Lemonn app to track Nifty and stock price levels, study options chains, and understand how different strike prices behave under different market scenarios.
