Take a look at some of Wednesday's midday movers:
Tesla Motors fell sharply after reporting earnings that disappointed investors. It delivered 5,500 Model S cars in the third quarter, below what some analysts had expected.
Ralph Lauren rose after the upscale clothing brand hiked its full-year sales forecast on expectations of a strong holiday season. It also raised its dividend.
Barracuda Networks had a strong market debut after the data-storage company priced 4.1 million shares at $18.
Halliburton gained after the provider of services to oil-and-gas drillers announced a 20 percent hike in its quarterly dividend to 15 cents a share.
Microsoft hit a 12-year-high. Nomura analyst Rick Sherlund said the software maker's earnings could reach $3.80 a share next year, versus the consensus estimate of $2.67. He raised his price target to $45 a share and kept a buy rating on its stock.
Ruby Tuesday gained after the restaurant chain's CEO disclosed purchasing 100,000 shares on Monday at $5.88 each.
Curis fell after the FDA put a partial hold on its experimental cancer drug following the death of a patient who had liver failure.
Vivus declined after BofA/Merrill Lynch downgraded the obesity-drug company to neutral from buy.
AngloGold Ashanti rose after posting strong third-quarter earnings.
Red Robin Gourmet Burgers fell after BofA/Merrill Lynch downgraded the casual-dining chain to underperform from neutral.
Activism Blizzard rose after the video-game publisher said it sold more than $1 billion worth of its latest 'Call of Duty' title into retail stores on the game's first available day.
Abiomed rose after the maker of heart devices reported better-than-expected second-quarter earnings and revenue.
Auxilium Pharmaceuticals rose after its third-quarter profit beat street forecasts, boosted by strong drug sales from a recently acquired company.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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