Take a look at some of Monday's midday movers:
Clovis moved lower after the company's lung cancer drug was linked to high blood sugar.
Ariad Pharmaceuticals climbed after the biotech company reported positive results from a study of its leukemia drug in patients with another form of cancer.
Conn's rose after the furniture retailer said its first-quarter earnings and sales topped expectations.
U.S. Steel fell after the company said it would close two tubular plants in the U.S. due to unfair trading practices in tubular steel being imported into the country.
Coal stocks Arch Coal, Alpha Natural Resources, Peabody and Walter Energy declined after the EPA mandated power plants cut their emission by 30 percent. Walter Energy came off its lows when the company said it doesn't see a material impact from the rule.
Protective Life rose on reports Japan's Dai-Ichi is in advanced talks to buy the company in a deal that could be worth over $5 billion.
Mastec fell after the infrastructure construction company said it expects second-quarter results to be negatively impacted by new and unexpected delays in its wireless project spending activity, as well as weaker-than-expected oil and gas segment results.
Omeros rose after FDA approved its drug for use in cataract and lens replacement surgeries.
—By CNBC's Rich Fisherman.