# Gamma of straddles

**Quantitative Finance**Level 1

**True, False or It depends?**

We know that the ATM straddle price can be approximated by the formula

\[ Y_{ATM} = \frac{ 1}{ 2000} S \sigma \sqrt{t}. \]

Since gamma is the second (partial) derivative with respect to the underlying price \(S \), the gamma of the straddle is 0.