<< it is rarely due to new buying in the last week of expiry, mostly owners selling n disgust. If that is the case, then the "killing" turn of the bunch of puts at $36 and $37 may come next.>>
my guess is, put holders either take their profits in this week or those puts are for insurance. now after today, most puts in the money should be gone. only fools would hold options till expiry if such options are in the money.
in fact the puts at 37 must have been gone a lot in order for that person to come up with a lower MP this morning.
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