Weekly gainers for January 3rd, 2014 are Molycorp, Inc. (NYSE:MCP), Enphase Energy, Inc. (NASDAQ:ENPH), Allied Nevada Gold Corp. (NYSEMKT:ANV) and weekly losers are Noah Holdings Limited (NYSE:NOAH), Idenix Pharmaceuticals, Inc. (NASDAQ:IDIX), DryShips Inc. (NASDAQ:DRYS).

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George Soros wins with Molycorp

Topping off our weekly gainers list is Molycorp, Inc. (NYSE:MCP), the stock price of which surged an impressive +30.77% to reach $5.95. Last quarter, billionaire George Soros bought 2.2 million shares for $6.81 each. This position represents 0.16% of Soros’ fund.

Following Molycorp Inc. is Enphase Energy, Inc. (NASDAQ:ENPH). The seller of microinverter systems for the solar photovoltaic industry increased +17.3% to $6.80. With 7.4 million ENPH shares (1.51%), Daniel Loeb has held a position in the firm since June 2012.

Gold and silver producer Allied Nevada Gold Corp. (NYSEMKT:ANV) rose +16.76% this week to hit $3.83. As of September, John Paulson owns 1.5 million shares, composing 0.04% of his portfolio. The investor paid an average price of $32.18.

Weekly Losers

The year started off rough for wealth management company Noah Holdings Limited (NYSE:NOAH), which dipped -11.56% to $16.97 this week. With 156,000 shares, NOAH represents 0.07% of Richard Chilton’s fund. The billionaire paid an average price of $9.39 per asset.

Idenix Pharmaceuticals, Inc. (NASDAQ:IDIX), a biopharmaceutical company, dropped -11.40% to $6.08.Seth Klarman holds 39.8 million shares (4.40% of his fund) after acquiring more than 13 million assets last quarter. Each asset cost Klarman an average price of $5.41.

And industrial stock DryShips Inc. (NASDAQ:DRYS), decreased -8.30% to $4.24, meaning another hit for Chilton. The investor holds 3.2 million DRYS shares (0.32% of his fund), acquired for $2.77. Additionally, George Soros bought 590,000 shares (0.02% of his portfolio) for $2.85 last quarter.