Analyst downgrade. https://www.benzinga.com/analyst-ratings/analyst-color/17/08/9938948/chicago-bridge-iron-downgraded-at-jefferies-as-bottom-li And from Friday..... http://www.marketwatch.com/story/chicago-bridge-irons-stock-plunges-as-company-takes-action-to-stay-alive-2017-08-10