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.

Define “At-the-Money” (ATM) for a Put Option
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How Does the Moneyness of an Option (ITM, ATM, OTM) Relate to the Strike Price?
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