Voltari Corp (NASDAQ:VLTC), Kite Pharma Inc (NASDAQ:KITE) and Uniqure NV (NASDAQ:QURE) are approaching market close in the green this Monday. In the red are Laredo Petroleum Inc (NYSE:LPI), Herbalife Ltd. (NYSE:HLF) and SandRidge Energy Inc. (NYSE:SD).

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Herbalife

Voltari Corp. Rebounds

Voltari Corp (NASDAQ:VLTC) climbed +26.97% today, though it’s still declined nearly -80% over the past year. The mobile advertising and marketing company was one of the worst-performing stocks in Carl Icahn’s portfolio in 2014. The billionaire has owned 678,000 VLTC shares since the second quarter of 2013.

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Kite Pharma Inc (NASDAQ:KITE) surged +13.6% after inking a deal with Amgen to develop and market cancer immunotherapies. Billionaire investor George Soros initiated a stake in the biopharmaceutical company in the third quarter of last year and has made a notable gain on his investment, with KITE gaining +97.36% over the past three months alone.

Uniqure NV (NASDAQ:QURE) approached market close up +13.53%. The Netherlands-based pharmaceutical company has rallied +68.1% over the past three months. Thomas Steyer’s Farallon Capital has held 50,000 QURE shares since the first quarter of 2014.

Oil Takes a Toll on Laredo Petroleum, SandRidge Energy

Laredo Petroleum Inc (NYSE:LPI) tumbled -14.4% – the result of plunging oil prices. In Richard Chilton’s portfolio since the fourth quarter of 2013, the energy stock has fallen -64.21% over the past year.

Herbalife Ltd. (NYSE:HLF) plummeted -13.13%, putting its one-month loss at -22.41%. The takeaway: Bill Ackman’s long-standing short on the company is looking like a good idea. Only time will tell how long billionaires Carl Icahn and George Soros will be willing to hold onto the stock.

Oil prices also took a toll on SandRidge Energy Inc. (NYSE:SD), which approached market close Monday down -12.57%. Leon Cooperman initiated a stake in the firm during the fourth quarter of 2012 and as of the third quarter of 2014 holds 45.48 million SD shares.

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