Small biotech CEO exodus continues as vTv, a troubled former Alzheimer's player, sees chief leave after just 4 months

It’s been a bad couple months for the heads of small, struggling biotechs.

On Friday, vTv therapeutics, a North Carolina company that once raised a $117 million IPO on the promise that it could resurrect an old Pfizer drug for Alzheimer’s, announced that CEO Deepa Prasad had resigned. Prasad had only been CEO since October, and no reason was given for the departure.