Take a look at some of Wednesday's midday movers:
Fastenal was the worst performer on the S&P 500 after an analyst suggested recent company sales data were indicative of a weaker manufacturing economy.
Monsanto traded lower after its Chief Technology Officer Robb Fraley said sabotage is being considered as a possible cause of the finding of unapproved genetically modified wheat in a field in Oregon. Monsanto also said that testing reaffirms that the finding was an isolated incident.