Could also be a negative diff. when the market opens on Monday - SPY lower than $266.
If the market opens lower on Monday (which I doubt it unless Trump opens his mouth again), as long as he's LONG on the call, he won't lose anything; he just didn't profit when he could've if he had closed his position today when the market is above 266, above the strike on his call. Like I said before, he will only lose if he's SHORT on that call, then if someone else exercised against him, then he will have to deliver the shares because currently the market price is higher than the strike on his call. But if Monday comes and if the market drops, if he's SHORT the call, then it's even better. He would have nothing to worry about cuz he won't even get exercised against.
There is NO negative difference. SPY is NOT cash-settled.
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