Take a look at some of Tuesday's midday movers:
Twitter moved higher. The company has acquired social data provider Gnip for an undisclosed amount.
Aaron's moved lower after the rent-to-own furniture and electronics retailer rejected a $2.3 billion takeover offer from major shareholder Vintage Capital Management and instead acquired retail credit financing firm Progressive Finance for $700 million. Aaron's also cut its first-quarter revenue outlook.
Riverbed Technology lost ground after Elliott Management reaffirmed its $3.36 billion offer for the network gear maker.
General Electric moved a bit lower. The Wall Street Journal reported CEO Jeff Immelt may step down sooner than his expected 20-year tenure.
Zebra Technologies slid after it said it would buy the enterprise business of Motorola Solutions for $3.45 billion in cash.
Infosys lost ground after it reported fourth-quarter revenue below forecasts and forecast
Pier 1 Imports gained ground after Barclay's upgraded the retailer to overweight and hiked its price target to $23 from $19 a share.
Hhgregg fell after the home appliance retail chain reported a sharp decrease in sales and said fourth-quarter profit would be below expectations.
Charles Schwab rose after the company posted better-than-expected first-quarter earnings.
Herbalife lost ground after it was hit with a shareholder class action lawsuit, accusing the company of failing to disclose to investors that its operations were allegedly based on a pyramid scheme.
Wal-Mart Stores moved lower after William Blair downgraded the retailer to underperform from market perform, citing e-commerce competition and a market shift away from big box retailers.
World Wrestling Entertainment rose after Needham began coverage with a buy rating and a price target of $30, seeing 50 percent upside.
GlaxoSmithKline moved a bit lower despite having its injection for treating adults with type 2 diabetes approved by the FDA.
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—By CNBC's Rich Fisherman.
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