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Where Is Gamma Highest for an Option?

Gamma is highest for an option that is At-The-Money (ATM), meaning the strike price is closest to the underlying asset's price. At this point, the option's Delta is most sensitive to changes in the underlying price, causing the largest change in Delta.

What Is Meant by an Option Being ‘In-the-Money’ (ITM), ‘At-the-Money’ (ATM), or ‘Out-of-the-Money’ (OTM)?
What Is the Relationship between Gamma and the “Moneyness” of an Option?
Why Is an ATM Option’s Time Value Highest Compared to ITM or OTM?
How Does Gamma Behave for ATM Options?