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Market Structure

At the Money (ATM)

An option whose strike price is roughly equal to the current stock price. Has the most extrinsic value of any strike.

What does "at the money" mean?

An option is "at the money" (ATM) when its strike price is roughly equal to the current stock price. In practice, traders refer to the nearest strike above or below the market price as ATM because exact matches are rare.

How ATM options behave

ATM options sit at the intersection of two forces:

  • They have no intrinsic value yet, so they are cheaper than ITM options.
  • They have the highest extrinsic value of any strike, because the market is unsure which direction they will go. Maximum time value, maximum time decay.

ATM options also have the highest gamma, meaning their delta changes fastest as the stock moves. A small move past the strike can turn a 50-delta option into a 70-delta option in minutes.

When to use ATM strikes

ATM strikes are a reasonable default when you have a directional bias but no view on how fast or far the move will be. They cost more than OTM strikes but decay slower as a percentage of their price, and they gain the most when the stock starts trending.

Related Terms

In the Money (ITM)

An option with real value right now. A call is ITM when the stock is above the strike; a put is ITM when the stock is below.

Options

Contracts that give the buyer the right, but not the obligation, to buy or sell a stock at a specific price before a specific date.

Out of the Money (OTM)

An option with no intrinsic value. Its price comes entirely from time value and the chance the stock moves before expiration.

The Greeks (Options)

A set of risk metrics for options: Delta (direction), Gamma (acceleration), Theta (time decay), and Vega (volatility sensitivity).