Derivatives

What is Strike Price?

Definition

The strike price (or exercise price) is the predetermined price at which an option holder can buy (for calls) or sell (for puts) the underlying asset. It is the most important factor in determining an option's value and risk/reward profile.

Detailed Explanation

Strike prices are set by the options exchange at standardized intervals. Stocks under $25 typically have $2.50 intervals, $25-200 have $5 intervals, and above $200 have $10 intervals, though high-volume stocks may have $1 intervals. Weekly options and high-demand stocks often have more granular strike availability.

The relationship between the strike price and current stock price determines the option's moneyness. For calls: in-the-money (strike below stock price), at-the-money (strike equals stock price), out-of-the-money (strike above stock price). For puts, the relationship is reversed. Each category offers different risk/reward characteristics.

Deep in-the-money options behave more like the underlying stock (high delta, near 1.0) and have significant intrinsic value but less leverage. At-the-money options offer the most time value and the highest rate of time decay. Out-of-the-money options are cheapest and offer the most leverage but have the lowest probability of expiring profitable.

Strike selection is one of the most critical decisions in options trading. Conservative strategies use ITM or ATM strikes for higher probability but lower returns. Aggressive strategies use OTM strikes for higher leverage but lower probability. The optimal strike depends on your conviction level, time horizon, and risk tolerance.

Frequently Asked Questions

How do I choose the right strike price?

Consider your directional conviction, time horizon, and risk tolerance. ATM strikes offer the best balance of cost and probability. OTM strikes are cheaper but less likely to profit. ITM strikes are more expensive but have higher probability. Many traders target strikes with delta between 0.30-0.50 for a balanced approach.

What does deep in-the-money mean?

A deep ITM option has a strike price far from the current stock price in the profitable direction. A $100 call when the stock is at $130 is deep ITM. These options have high intrinsic value, move nearly dollar-for-dollar with the stock, and have less risk of expiring worthless but offer less leverage.

Related Terms

Call Option

A call option gives the holder the right, but not the obligation, to buy a specified number of shares at a predetermined price (strike price) before a specific expiration date. Investors buy calls when they expect the stock price to rise, as calls increase in value as the underlying stock appreciates.

Put Option

A put option gives the holder the right, but not the obligation, to sell a specified number of shares at a predetermined strike price before expiration. Investors buy puts when they expect a stock price to decline or want to protect an existing stock position from downside risk.

Options Expiration

Options expiration is the date on which an option contract becomes void and the right to buy or sell the underlying asset ceases to exist. Standard monthly options expire on the third Friday of each month, while weekly options expire every Friday.

Options Premium

The options premium is the price paid by the buyer to the seller for an option contract. It consists of intrinsic value (how much the option is in-the-money) and extrinsic value (time value plus volatility value). The premium represents the maximum loss for option buyers and maximum gain for option sellers.

See It in Action

Apple

Microsoft

Johnson & Johnson

Berkshire Hathaway

Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute investment advice. AI-generated analysis may contain errors or inaccuracies. Always conduct your own research and consult a qualified financial advisor before making investment decisions.