CONN’S Inc. (NASDAQ:CONN), Petroleo Brasileiro Petrobras SA (NYSE:PBR) and Qiwi PLC (NASDAQ:QIWI) started the day with major gains this Thursday. Taking tumbles today are Stemline Therapeutics Inc. (NASDAQ:STML), Novacopper Inc. (NYSEMKT:NCQ) and Alpha Natural Resources Inc. (NYSE:ANR).

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CONN’S Inc. Climbs

CONN’S Inc. surged +11.68% early in the day after reporting an 11.5% increase in retail net sales for December. David Einhorn’s Greenlight Capital initiated a stake in the retailer during the first quarter of 2014 and has yet to return its investment on this one, given the stock’s more than -70% drop over the past year.

Petroleo Brasileiro climbed +10% on high volume. The Brazil-based oil and gas company hit a new 52-week low earlier this week. Both Ray Dalio and George Soros have positions in the company.

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Qiwi gained +7.78% as Russian markets and the ruble bounce. The Russia-based payment services company has performed poorly in recent months, its price falling -41.46% over the past six months. Leon Cooperman picked up a stake in the firm during the second quarter of 2014 and as of his most recent regulatory SEC filing holds 100,000 QIWI shares.

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Stemline Therapeutics Tumbles After Price Announcement

Stemline Therapeutics tumbled -9.2% after announcing the pricing of its common stock offering at $15.75 per share. The biotech company has been in the Farallon Capital portfolio since the second quarter of 2013.

Novacopper dipped -9.02% early in the day, though it’s since rebounded. The metals exploration company, a John Paulson holding, has been the target of short interest growth lately. Its price has fallen -58.55% over the past year.

Alpha Natural Resources fell -6.43% in the wake of news of its CFO’s retirement. Brazilian billionaire Jorge Lemann has been building a stake in the company since the first quarter of last year.

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