What is Call Delta? Call Delta is the sum of all call option delta for all available strikes. Why does Call Delta matter? A large call option delta implies there is a large options market maker hedge position. How to use Call Delta When a large amount of call delta expires options market makers may have to unwind corresponding long stock hedges. This could cause selling pressure in the stock. Related articles What is Put Delta? What is Call Gamma? What is Gamma Flip? What is Gamma, Market Gamma and/or Total Market Gamma? What is Net Gamma?