# Strike Price: What It Is and How It Affects Options Value

Published: 2026-02-23
Author: Warren Team
URL: https://www.heywarren.com/blog/strike-prices

---
The strike price (also called the exercise price) is the predetermined price at which an options contract's holder can buy or sell the underlying asset. It is one of the five key parameters that define any options contract — along with the underlying asset, expiration date, type (call or put), and premium. The relationship between the strike price and the current market price determines whether an option has intrinsic value, significantly influencing both the premium paid and the potential profit/loss from the position. Every options trader must understand strike price mechanics to correctly size positions, assess risk, and choose appropriate strategies.

## What Is a Strike Price?

The strike price is fixed at the time the option is written and does not change for the life of the contract. When you exercise an option, the [transaction](/blog/what-is-a-transactions) occurs at the strike price — regardless of where the market price is at that time.

**For a call option**: The strike price is the price at which you can **buy** the underlying stock. If you hold a call with a $100 strike and the stock trades at $115, you can buy at $100 (the strike), a $15 advantage per share.

**For a put option**: The strike price is the price at which you can **sell** the underlying stock. If you hold a put with a $100 strike and the stock falls to $85, you can sell at $100 (the strike), a $15 advantage per share.

## In-the-Money, At-the-Money, and Out-of-the-Money

The relationship between the strike price and the current stock price determines the option's **moneyness**:

![The three moneyness states for a call option with the stock trading at $100.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20600%20211%22%20width%3D%22600%22%20height%3D%22211%22%20role%3D%22img%22%3E%3Ctitle%3EHierarchy%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%22220%22%20y%3D%2220%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22300%22%20y%3D%2254%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22white%22%3ECall%20Option%20%28Stock%20%241%E2%80%A6%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20120%20105.5%20L%20120%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%2240%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22120%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EITM%3C%2Ftext%3E%3Ctext%20x%3D%22120%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3EStrike%20%2490%20%E2%86%92%20%2410%20value%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20300%20105.5%20L%20300%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%22220%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22300%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EATM%3C%2Ftext%3E%3Ctext%20x%3D%22300%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3EStrike%20%24100%20%E2%86%92%20break-even%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20480%20105.5%20L%20480%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%22400%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22480%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EOTM%3C%2Ftext%3E%3Ctext%20x%3D%22480%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3EStrike%20%24110%20%E2%86%92%20no%20value%3C%2Ftext%3E%3C%2Fsvg%3E)

*The three moneyness states for a call option with the stock trading at $100.*

| Term | Call Option | Put Option | Has Intrinsic Value? |
|---|---|---|---|
| In-the-money (ITM) | Strike < Market price | Strike > Market price | Yes |
| At-the-money (ATM) | Strike ≈ Market price | Strike ≈ Market price | Minimal |
| Out-of-the-money (OTM) | Strike > Market price | Strike < Market price | No |

**Example** (stock at $100):
- $90 call: **ITM** — you can buy at $90, currently worth $100 → $10 intrinsic value
- $100 call: **ATM** — at break-even level
- $110 call: **OTM** — strike above market; no intrinsic value (only time value)
- $90 put: **OTM** — strike below market
- $100 put: **ATM**
- $110 put: **ITM** — you can sell at $110, currently worth $100 → $10 intrinsic value

## How Strike Price Affects Premium

An option's premium consists of two components:

![Deep ITM calls carry ~$20.50 premium vs ~$6.00 for ATM calls on a $100 stock, showing how intrinsic value drives cost.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20800%20210%22%20width%3D%22800%22%20height%3D%22210%22%20role%3D%22img%22%3E%3Ctitle%3EComparison%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Ctext%20x%3D%22230%22%20y%3D%2257.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EDeep%20ITM%20%28%2480%29%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%2225%22%20width%3D%22450%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22702%22%20y%3D%2257.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%232563eb%22%3E%2421%3C%2Ftext%3E%3Ctext%20x%3D%22230%22%20y%3D%22152.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EATM%20%28%24100%29%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%22120%22%20width%3D%22131.7073170731707%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%237c3aed%22%2F%3E%3Ctext%20x%3D%22383.7073170731707%22%20y%3D%22152.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%237c3aed%22%3E%246%3C%2Ftext%3E%3C%2Fsvg%3E)

*Deep ITM calls carry ~$20.50 premium vs ~$6.00 for ATM calls on a $100 stock, showing how intrinsic value drives cost.*

**Intrinsic value**: The in-the-money amount — the immediate exercise value. ITM options have intrinsic value; OTM options have zero intrinsic value.

**Time value (extrinsic value)**: The premium above intrinsic value, representing the probability that the option will gain more value before expiration. Time value is highest at-the-money and decreases for deeper ITM or OTM options.

| Strike Relationship | Intrinsic Value | Time Value | Total Premium |
|---|---|---|---|
| Deep ITM ($80 call, stock at $100) | $20 | Low | ~$20.50 |
| ATM ($100 call, stock at $100) | $0 | Highest | ~$6.00 |
| Slightly OTM ($105 call, stock at $100) | $0 | Moderate | ~$3.50 |
| Deep OTM ($120 call, stock at $100) | $0 | Very low | ~$0.50 |

This pricing structure explains why ATM options are most sensitive to time decay (theta) — they have the most time value to lose.

## Strike Price Selection: Trade-offs

Choosing the right strike price is one of the fundamental decisions in options trading:

![Options strike choices mapped by cost and probability of profit, illustrating the leverage vs. certainty trade-off.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20720%20480%22%20width%3D%22720%22%20height%3D%22480%22%20role%3D%22img%22%3E%3Ctitle%3EQuadrant%20matrix%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%2290%22%20y%3D%2225%22%20width%3D%22300%22%20height%3D%22190%22%20fill%3D%22%23dbeafe%22%2F%3E%3Crect%20x%3D%22390%22%20y%3D%2225%22%20width%3D%22300%22%20height%3D%22190%22%20fill%3D%22%23d1fae5%22%2F%3E%3Crect%20x%3D%2290%22%20y%3D%22215%22%20width%3D%22300%22%20height%3D%22190%22%20fill%3D%22%23ffedd5%22%2F%3E%3Crect%20x%3D%22390%22%20y%3D%22215%22%20width%3D%22300%22%20height%3D%22190%22%20fill%3D%22%23ede9fe%22%2F%3E%3Cline%20x1%3D%2290%22%20y1%3D%22215%22%20x2%3D%22690%22%20y2%3D%22215%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cline%20x1%3D%22390%22%20y1%3D%2225%22%20x2%3D%22390%22%20y2%3D%22405%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22240%22%20y%3D%22100%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3EDeep%20ITM%3C%2Ftext%3E%3Ctext%20x%3D%22240%22%20y%3D%22120%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20High%20premium%3C%2Ftext%3E%3Ctext%20x%3D%22240%22%20y%3D%22136%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20High%20delta%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22100%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3EATM%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22120%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20Moderate%20cost%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22136%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20~0.50%20delta%3C%2Ftext%3E%3Ctext%20x%3D%22240%22%20y%3D%22290%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3EDeep%20OTM%3C%2Ftext%3E%3Ctext%20x%3D%22240%22%20y%3D%22310%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20Cheap%3C%2Ftext%3E%3Ctext%20x%3D%22240%22%20y%3D%22326%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20Binary%20payoff%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22290%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3ESlight%20OTM%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22310%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20Lower%20cost%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22326%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3E%E2%80%A2%20Moderate%20odds%3C%2Ftext%3E%3Ctext%20x%3D%2290%22%20y%3D%22425%22%20text-anchor%3D%22start%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3ELow%20Probability%3C%2Ftext%3E%3Ctext%20x%3D%22690%22%20y%3D%22425%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EHigh%20Probability%3C%2Ftext%3E%3Ctext%20x%3D%22390%22%20y%3D%22453%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EProbability%20of%20Profit%3C%2Ftext%3E%3Ctext%20x%3D%2280%22%20y%3D%2237%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EHigh%20Cost%3C%2Ftext%3E%3Ctext%20x%3D%2280%22%20y%3D%22405%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3ELow%20Cost%3C%2Ftext%3E%3Ctext%20x%3D%2235%22%20y%3D%22215%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%20transform%3D%22rotate%28-90%2035%20215%29%22%3EPremium%20Cost%3C%2Ftext%3E%3C%2Fsvg%3E)

*Options strike choices mapped by cost and probability of profit, illustrating the leverage vs. certainty trade-off.*

**Buying calls**:
- **Deep ITM call**: High premium, high delta (moves closely with stock), lower leverage. Behaves more like owning stock.
- **ATM call**: Moderate premium, ~0.50 delta. Balanced risk/reward.
- **OTM call**: Low premium, high leverage, lower probability of profit. Binary-like payoff.

**Buying puts (hedging)**:
- **ATM put**: Full protection at current levels; highest cost
- **OTM put**: Cheaper hedge; only protects below the strike (e.g., a 10% OTM put only protects against drops beyond 10%)
- **Deep ITM put**: Expensive; behaves like short stock

**Selling options (income strategies)**:
- **OTM covered calls**: Strike above current price; high probability of keeping premium; limited upside if stock surges past strike
- **OTM cash-secured puts**: Strike below current price; premium received if stock stays above strike

## Strike Price in Employee Stock Options

In employee stock options (ESOs and ISOs), the strike price is typically set at the **fair market value of the stock on the grant date**. This "at-the-money" strike means the options have no intrinsic value at grant — employees only benefit if the stock price rises above the strike price after vesting.

The [IRS](https://www.irs.gov/) requires stock options to be granted at fair market value to qualify for favourable tax treatment. Backdating option grants to a lower strike price (as occurred in the mid-2000s options backdating scandal) is securities fraud.

## Strike Prices and Volatility

**Implied volatility (IV)** — the market's expectation of future price movement — affects option premiums across all strikes, but the IV "smile" or "skew" means different strikes trade at different implied volatilities:

- OTM puts often trade at higher implied volatility than ATM or OTM calls — reflecting demand for downside protection (the "volatility skew")
- Deep OTM calls sometimes trade at higher IV than ATM options — the "volatility smile"

This skew means OTM puts are typically more expensive (relative to expected value) than their probability of expiring in-the-money would suggest — reflecting the market's pricing of tail risk.

## Conclusion

The strike price is the defining parameter of an options contract — it establishes the price level at which the option has value and determines the trade-off between premium cost, probability of profit, and leverage. ITM options provide intrinsic value and behave more like the underlying; OTM options are cheaper and more leveraged. Selecting appropriate strike prices requires understanding intrinsic vs. time value, delta exposure, and how moneyness interacts with volatility and time to expiration.

Warren at [heywarren.com](https://heywarren.com) helps investors understand options pricing, strike selection strategies, and derivatives risk management for [equity](/blog/equity-meaning-in-business) and index portfolios.

---


## Related Reading

**More from Warren**:
- [Butterfly Spread: What It Is and How Options Traders Use It](/blog/butterfly-finance)
- [ESOS Meaning: Employee Share Option Schemes Explained](/blog/esos)
- [Credit Default Swap: What It Is and How Credit Risk Is Priced](/blog/credit-default-swap)

**Authoritative sources**:
- [CBOE — Options Education](https://www.cboe.com/education/)
- [OCC — Options Clearing Corporation](https://www.theocc.com/risk-management)
- [FINRA — Options Trading Rules](https://www.finra.org/rules-guidance/rulebooks/finra-rules/2360)