Market Insider

Midday movers: Twitter, Aaron's, Herbalife

'#Ring!' is displayed on a mobile device as the company announced its initial public offering and debut on the New York Stock Exchange.
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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.

Utility stocks continued their strong run for the year. Northeast Utilities, DTE Energy, Wisconsin Energy and AGL Resources all hitting record highs.

GlaxoSmithKline moved a bit lower despite having its injection for treating adults with type 2 diabetes approved by the FDA.

Yahoo, Intel and CSX all moved lower ahead of earnings reports after the bell.

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—By CNBC's Rich Fisherman.

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