RE:RE:Institutional holdings - Quarterly filingsIt is hard to tell. According to https://stockzoa.com/ticker/vmd/ there is no single institution down by 1.7 million shares. It could more than one institution selling cooperatively but I suspect it was a churning algorithm utilized for the sale to try to moderate a price decline. It sure didn't work.
Vanguard (a large holder) sold 15% of their holdings while Rennaisance Technologies bought quite a few to become a significant holder.