After the California medical show last week I expected an upgrade by today. It ended on Wednesday last week. So with all this PBTH noise maybe they will hold off for clarity. Once that closes opk might take a hit if many PBTH holders bail which would be stupid on their part.
I suspect that there will be a lock up period for pbth shareholders after the buy out. I've seen Frost do that before with other acquisitions. So if those bitter pbth shareholders want out they probably need to be doing so.