Take a look at some of Tuesday's midday movers:
Homebuilders, including Toll Brothers, Lennar, DR Horton, Pulte and Hovnanian, rose as October housing starts rose to their highest rate in four years.
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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If there was ever an argument for owning a broad portfolio of stocks, the first half of 2015 is Exhibit 1.
Monday's violent selloff could be the prelude to a more volatile second half, but strategists still expect the S&P 500 to gain.
Names on the move ahead of the open.
Monday's losses wiped out slight quarterly gains for the S&P 500 and Dow, sending them into negative territory for the year.
Patti Domm is CNBC Executive Editor, News, responsible for news coverage of the markets and economy.
A CNBC reporter since 1990, Bob Pisani covers Wall Street from the floor of the New York Stock Exchange.
Senior Producer at CNBC's Breaking News Desk.
Dominic Chu is a markets reporter for CNBC.
Evelyn Cheng is a markets writer for CNBC.
Sara Eisen is a correspondent for CNBC, focusing on currencies and the global consumer.