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Can someone explain to me why the delta-hedging of ATM options near expiry is difficult?

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closed as off topic by Jase, olaker Nov 4 '12 at 13:53

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Why is this closed? There is a scientific explanation to this question, as the delta of ATM options close to expiry becomes binary. – RockScience Apr 3 '14 at 8:13
up vote 4 down vote accepted

This is usually called Pin Risk. It's difficult because there is a high degree of uncertainty regarding the whether the options you sold are exercised or not. If you don't hedge, your short options could be exercised and you are left with risky net short position in the underlying. If you hedge and your short options are not exercised, then you have a long position in underlying after expiry. Alternatively, you can partially hedge. However, in any case, you are potentially exposed to risk of adverse underlying movement.

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