Corinthian Colleges Inc (NASDAQ:COCO), Cal Dive International, Inc. (NYSE:DVR) and iRobot Corporation (NASDAQ:IRBT) are today’s top-gaining billionaire stock picks. The biggest losers of the day are Nanosphere, Inc. (NASDAQ:NSPH), Altisource Portfolio Solutions S.A. (NASDAQ:ASPS) and Cree, Inc. (NASDAQ:CREE).

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iRobot

iRobot Surges

The share price of Corinthian Colleges Inc (NASDAQ:COCO) surged +46.43% this Wednesday, putting its five-day gain at +185.71%. It closed the day priced at $0.20 – still well below its 52-week high of $2.54. George Soros initiated a position in the company in Q2.

Cal Dive International, Inc. (NYSE:DVR) got a +21.09% boost today, rebounding a bit from the -65.57% loss it’s posted over the past 30 days. The company is yet another new Soros investment the billionaire is still waiting for returns on.

iRobot Corporation (NASDAQ:IRBT) climbed +14.01% today – the result of its stellar earnings report, released at market close Tuesday. IRBT posted $143.5 million in Third-quarter revenue and $0.48% in EPS, well above analysts’ estimate of $134.8 million and $0.33. Tiger Global placed a 603,000-share bet on the company in Q2.

Cree Inc. Disappoints on Earnings

Nanosphere, Inc. (NASDAQ:NSPH) tumbled -33.3% this Wednesday following the announcement of the pricing for its $20 million public offering of common stock. The manufacturer of molecular diagnostics platform the Verigene System, NSPH has declined -78.56% year-to-date.

Altisource Portfolio Solutions S.A. (NASDAQ:ASPS) dipped -18.22% today, putting its five-day loss at -27.28%. The company is slated to report third quarter results tomorrow, and the expectations apparently aren’t high. With a position in ASPS across several quarters, Leon Cooperman is likely paying attention to how this one plays out.

Cree, Inc. (NASDAQ:CREE) took a -17.71% dive this Wednesday after reporting weak numbers for the first quarter of fiscal 2015. The LED products maker missed analysts’ estimates, posting a quarterly adjusted net income of $29.50 million and $0.24 in EPS. Billionaire hedge fund manager Ray Dalio has held a position in the company since the third quarter of 2013.