Take a look at some of Tuesday's midday movers:
FutureFuel - Shares of the biodiesel producer jumped 16 percent after posting fourth-quarter results that topped expectations.
General Motors - The auto manufacturer climbed after Chief Executive Officer Mary Barra promoted an engineering executive to a newly created vehicle-safety job in response to flawed ignition switches tied to 12 deaths and the recall of more than 1.6 million vehicles.
Hewlett-Packard - The computer maker gained 3.4 percent after Barclays hiked its rating on the company to overweight from equal weight.
Microsoft - Shares rose to their highest level since July 2000 after reports cited unidentified sources as saying the software company might unveil Office for iPad later this month.