Take a look at some of Tuesday's midday movers:
Twitter moved higher on news that the social media network had named Goldman Sach's Anthony Noto as its new CFO.
GoPro rose for the fourth consecutive day since going public, doubling the camera maker's price offering of $24 a share.
Lockheed Martin rose after early lows. The aerospace and defense products developer said it would freeze its current pension plan and move employees to a defined contribution retirement plan.
Salix Pharmaceuticals soared on positive late stage results for the gastrointestinal drug company's treatment of irritable bowel syndrome.
General Motors climbed after reporting a better than expected 1 percent rise in .
Ford fell slightly after reporting a 5.8 percent fall in June auto sales, which still beat street expectations of a 6.6 percent drop.
Toyota gained ground after reporting a 3.3 percent rise in June auto sales.
Verizon moved higher after BTIG initiated coverage with a buy rating and a $60 price target.
Casino stocks Wynn Resorts, MGM, Las Vegas Sands and Melco Crown all advanced despite the first monthly decline in Macau gaming revenue since mid-2009. Analysts said the decline is priced in with Deutsche Bank adding that the worst is over from the negative impact of World Cup soccer.
Nordstrom jumped after Topeka Capital raised the retailer's price target to $75 a share and maintained a buy rating.
Nabors Industries rose after Raymond James raised the rating on the oilfield services provider to outperform from market perform, saying the firm is poised to deliver more sustainable growth through 2015.
JD.com gained ground after Jefferies Group began coverage with a buy rating and $36 price target based on the e-commerce website's strategic partnership with Chinese tech conglomerate Tencent Holdings.
Generac fell after Bank of America/Merrill Lynch downgraded the maker of generators to neutral from buy and cut the price target to $53, citing limited seasonal pickup.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.