Midday movers: Lockheed Martin, Plantronics & more
CIT Group - The commercial lender edged lower after releasing quarterly results.

Plantronics - The headset maker fell after it posted weaker-than-expected third-quarter results.

Lockheed Martin - The defense contractor fell after projecting 2015 earnings short of estimates. Rivals Northrop Grumman , Raytheon and General Dynamics also dropped..

Take a look at some of Tuesday's midday movers:

Twitter - The social-media supplier tumbled on user-growth concerns ahead of its earnings.

CommScope Holding Company - The company surged on a Wall Street Journal report it was nearing a deal to buy TE Connectivity 's network-equipment unit for about $3 billion.



Newmont Mining - The commodity producer and competitors including Barrick Gold , Goldcorp and Yamana Gold rose with gold.

AK Steel - The steel supplier gained after better-than-expected fourth-quarter profits.



Peabody Energy - The coal miner declined as it posted disappointing fourth-quarter earnings.

Nucor - The he steel manufacturer rose after reporting a rise in quarterly profit.



Family Dollar Stores - The discount retailer edged higher. Investor Nelson Peltz cut his stake by 72 percent, according to a regulatory filing.

Bristol-Myers Squibb - The pharmaceutical company slid after saying the strong dollar will drag on its 2015 outlook.

Novartis - The Swiss drug maker gained after projecting increased sales and profits.

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