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1answer
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How do I calculate the probability of a short option position expiring worthless?

I want to be able to determine the probability of a short option position (call or put) expiring worthless. Don't know where to start but I see probabilities derived from the greeks on some web sites?...
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1answer
41 views

How should I understand expiration dates?

The following is an excerpt from Introduction to the Mathematics of Finance by Roman: Expiration Dates The last trading day of an option is the third Friday of the expiration month and the ...
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2answers
393 views

Why do some stock options have expiration dates for a given month, while others don't?

Take two stocks, WWE and XPO, both traded on NYSE. Today, May 28, 2014, XPO has options expiring August 2014... ...while WWE doesn't: Why is that? From my experience, the missing expiration ...
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1answer
69 views

how market makers set the time factor to calculate option greeks on the expiration day?

how market makers set the time factor to calculate option greeks on the expiration day? does they set time equal 1/24or 2/24 when only 1hour or 2hour left? what frequency market makers update new time ...