Take a look at some of Tuesday's midday movers:
General Electric - The provider of appliances and financial services fell after Deutsche Bank downgraded the stock to hold from buy.
Boeing - The plane maker dropped after saying it delivered 723 jetliners last year.
United States Steel - The company dropped after saying it would idle a plant that makes pipe and tube for energy exploration.
Johnson & Johnson - The pharmaceutical company relinquished initial gains. It said it had started testing an Ebola vaccine in humans.
Gilead Sciences - The drug developer rose after saying it would buy a liver treatment being developed by Phenex Pharmaceuticals.
Alkermes - The drug developer gained after announcing positive results for its treatment of a depressive disorder.
Nielsen - The viewer-ratings service fell after CNBC said it would stop receiving its services.
CytRx - The drug developer soared after reporting positive results for its experimental brain cancer treatment.
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