I do believe the announcement has brought a lot of attention to IMGN. I wouldn't be surprised with either a counter-offer, or rejection by the institutions who control IMGN and sending a clear message to management that it's premature to sell the company when we're just starting to achieve real success.
I don't believe that this will be finally resolved for several months unless a rejection comes quickly, or a better offer comes in. Regardless, if the company's to be sold, it will take several months to conclude and in spite of penalties that would be included, an offeror willing to pay billions more will live with the penalties imposed in the existing offer.
If I didn't think we could get a substantially higher price I'd probably sell out now, or shortly after the first of the year to put off the tax gain, and invest my money elsewhere, but I like the chances of raising the price to $40 a share, or more.