I certainly don't know, but I'd suspect that this agreement was put together over a period of time, management didn't solicit it, but rather it was presented to them, and they couldn't pass it up. This is something my old broker told me about most similar deals IMGN made. Even though the company knows good news is coming, when presented with serious cash in exchange for stock, along with the ability to put those shares in
strong hands, a company is more likely to go for such a deal than turn it down.
Gary
Bullish