Mosaic gained ground on a rumor that it has hired JP Morgan to explore strategic alternatives due to foreign interest in the company.
Cooper Tire & Rubber fell on reports Apollo Tyres has "put on hold" its plans to acquire the company.
Schiff Nutrition fell after Bayer decided not to top Reckitt Benckiser's $1.4 billion, $42 a share bid for the vitamin maker.
Medtronic rose on signs its key heart and spine markets were improving. Its second-quarter earnings matched analysts expectations.
Shoe Carnival slumped after the footwear retailer predicted current quarter earnings below Street forecasts.
Sturm Ruger moved higher after the firearm's maker unveiled a special dividend of $4.50 a share.
Patterson Companies moved lower after the medical supply company's second-quarter earnings fell 7 percent on slowing sales growth. It also lowered its full-year earnings estimate.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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