Could 0-1 DTE options really be the prime mover of the extreme daily ranges lately?

I know how to the get the Black Scholes delta but I don’t think that’s what you’re asking for. I am fairly certain that the BS delta or any Greek is incorrect close to expiration.
 
In op #2 it refers to front delta needed to be hedged at expiration.

How would one calculate that? I'm not big enough for a Nomura account. Anywhere else to find it?
 
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