Stocks making the biggest moves midday: Super Micro, Cracker Barrel, Robinhood Markets, truckers & more

Check out some of the companies making the biggest moves midday: Trucking companies — Freight stocks sold off in reaction to Amazon saying it will open its less-than-truckload shipping services to companies outside its own network, posing a threat to industry incumbents. FedEx Freight Holding and Old Dominion Freight Line both slumped 5%; XPO dropped 4%; and Saia and ArcBest each fell 3%. Amazon itself dipped 2%. …