I wish I knew. These gyrations aren't nearly as unusual as they used to be. Maybe it's the Trump factor! I saw an article just now wondering if there might be something out there and came across this one. http://www.nasdaq.com/article/chicago-bridge-iron-cbi-secures-a-contract-worth-200m-cm716103 Maybe some institutions are still in selling mode. http://www.nasdaq.com/symbol/cbi/institutional-holdings http://www.nasdaq.com/symbol/cbi/analyst-research