Voltari Corp. (NASDAQ:VLTC), Civeo Corp. (NYSE:CVEO) and Twitter started trading today with big gains. Whiting Petroleum Corp. (NYSE:WLL), Tasman Metals Ltd. (NYSEMKT:TAS) and Zafgen Inc. (NASDAQ:ZFGN) are taking tumbles.

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Voltari Corp. gained +7.7% in early trading this Tuesday and is up more than +35% for the year. Carl Icahn owns 14.51% of the company.

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Civeo Corp. surged +4.78%, though it’s still trading dangerously close to its 52-week low of $2.25 and light years away from its high of $28.40. As of his most recent 13F filing, David Einhorn holds 10.66 million CVEO shares.

Twitter was up +4.54% about half an hour after market open. Yesterday, the social media giant announced a partnership with Foursquare to allow users to include their locations in Tweets. Chase Coleman’s Tiger Global has a small stake in Twitter, the share price of which has gained +40% in 2015.

Whiting Petroleum Tumbles as Search for a Buyer Looks Doubtful

Whiting Petroleum plunged -20.23% this morning in the wake of yesterday’s announcement of plans to offer 35 million shares as well as $1.75 billion of convertible senior notes – a move that has raised concerns regarding the company’s ability to find a buyer. The share price of the oil and gas company has declined more than -50% over the past year, weighing heavily on the portfolio of billionaire John Paulson, who as of the end of Q4 holds 13.45 million WLL shares.

Tasman Metals dipped -7.17%, dipping back down after yesterday’s rally. Billionaire George Soros is a stakeholder in the firm.

Biotech stock and Farallon Capital holding Zafgen Inc. fell -6.87%. Despite today’s early-morning decline, ZFGN is up +36% in 2015.

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