ImmunoGen stock spikes as HSR period for AbbVie deal expires (NASDAQ:IMGN)
Nastassia Samal ImmunoGen (NASDAQ:IMGN) added ~6% premarket Thursday after announcing that the 30-day Hart-Scott-Rodino (HSR) waiting period in relation to its M&A agreement with AbbVie (NYSE:ABBV) expired without any action…