Midday Movers: FAST, MON, JNPR & More

Market Insider | What's Shaking | Stocks to Watch

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.

Juniper Networks rose on CEO comments made at a technology conference that the company's routing performance was above average so far in its second quarter. Competitors Cisco Systems and F5 Networks moved higher as well.

Helmerich & Payne traded higher after the company increased its quarterly dividend to 50 cents a share from 15 cents per share.

Red Hat, the company that provides open-source software solutions, was the only S&P 500 stock to hit a 52-week low on Wednesday.

Bed, Bath & Beyond was higher following an upgrade to "buy" from "neutral" at Nomura with a price target of $82 a share.

CareFusion and Micron Technology were the only two stocks to hit a 52-week high on the S&P 500. CareFusion, a global medical technology company also hit an all-time high.

IBM, McDonald's and Walt Disney were the biggest losers on the Dow.

—By CNBC's Lori Spechler

Questions? Comments? Email us at marketinsider@cnbc.com