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How Is an ATM Option Defined for a Put Option?

An At-The-Money (ATM) put option is defined as one where the strike price is approximately equal to the current price of the underlying asset. If the underlying price is slightly below the strike, it is slightly ITM; if slightly above, it is slightly OTM.

What Is the Concept of “Moneyness” (In-the-Money, Out-of-the-Money) for a Call Option?
Can a Covered Put Be Considered a Defined-Risk Trade?
What Is the Significance of the Strike Price Being Equal to the Current Market Price?
What Is the Term for an Option Where the Strike Price Equals the Underlying Price?