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Does Vanna Tend to Be Highest for ATM or OTM Options?

Vanna tends to be highest for At-the-Money (ATM) options. This is because the Delta of an ATM option is most sensitive to changes in implied volatility.

A small change in IV has the largest impact on the probability of an ATM option expiring ITM, leading to the greatest change in Delta, which is the definition of Vanna.

How Can a Trader Use Vanna to Manage a Delta-Hedged Portfolio?
Does a Change in the Risk-Free Rate Have a Greater or Lesser Impact on OTM Option Delta than on ATM Option Delta?
How Can a Trader Use the ‘Vanna’ Greek to Predict Changes in Delta Due to IV Changes?
What Is the Formulaic Relationship between Vanna, Delta, and Vega?