Midday movers: Caterpillar, RadioShack, Tiffany & more

Scott Mlyn | CNBC

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

Activision Blizzard - The video-game maker edged lower after it said its latest offering produced $500 million in sales in its first day.

Caterpillar - The maker of construction and mining equipment fell after Bank of America Merrill Lynch downgraded its stock to neutral from buy.

Exxon Mobil - The oil producer and competitors including Chevron, ConocoPhillips and Hess declined along with the price of oil. Valero Energy and refiners such as Tesoro, Phillips 66 and Marathon Petroleum also fell.

General Motors - The auto manufacturer rose. According to Barron's, Sterne Agee said GM is still worth buying.

Manchester United - The British soccer club fell after reporting a fourth-quarter loss.

Mobileye - The maker of collision-avoidance technology declined after Deutsche Bank downgraded it to hold from buy.

NPS Pharmaceuticals - The drug developer jumped after a preliminary review by the U.S. Food and Drug Administration found its hormone-replacement therapy cut the need for calcium and vitamin D supplements.

RadioShack - The electronics retailer dropped sharply a day after Wedbush Securities said it could file for bankruptcy soon.

Tiffany - The upscale jeweler fell after Credit Suisse cut its rating on its shares to neutral from outperform.

TRW Automotive Holdings - The auto-parts manufacturer rose after saying it would sell its engine-valve unit to Federal Mogul for $385 million.

Visteon - The maker of auto parts gained after Bloomberg reported it was weighing a split into two companies.

(See CNBC's Market Insider Blog)

—By CNBC's Rich Fisherman.

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