Kahn Brothers Group, Pabrai Investments and Tweedy Browne Co., filed 13f for Q4 2012, here are the favorite stock picks and updates from their portfolios.

Hedge Funds

Irving Kahn made very small reductions to his top five long positions in Citigroup Inc. (NYSE: C) Pfizer Inc. (NYSE:PFE), New York Community Bancorp, Inc. (NYSE:NYCB) and Merck & Co., Inc. (NYSE:MRK), while making a small addition to his stake in The New York Times Company (NYSE:NYT).

The fund bought no new position, neither did it exit out of any holding in Q4. Kahn Group added to its existing stake in Patterson-UTI Energy, Inc. (NASDAQ:PTEN), Novartis AG (ADR) (NYSE:NVS) and KeyCorp (NYSE:KEY). Kahn filed a 13G/A today to update its ownership in Nam Tai Electronics, Inc.(NYSE:NTE). Kahn Borthers now holds 2,881,121 shares of the company, which is 6.43 percent of the company and 6.9 percent of Kahn’s public long portfolio. Nam Tai Electronics, Inc.(NYSE:NTE) has been a big gainer for Kahn’s portfolio. The position was reduced by about 8000 shares. There was also no major reduction in existing stakes except a 12 percent decrease in International Business Machines Corp. (NYSE:IBM) and a 28 percent reduction in NewMarket Corporation (NYSE:NEU).

Mohnish Pabrai of Pabrai Investments also holds a stake in Citigroup Inc. (NYSE: C), a position he has kept steady in fouth quarter along with his stake in Bank of America Corp (NYSE:BAC). Pabrai increased his position in Horsehead Holding Corp. (NASDAQ:ZINC), a zinc and nickel based products company. He also bought more shares of Chesapeake Energy Corporation (NYSE:CHK), while marginally reducing his stake in General Motors Company (NYSE:GM) and Goldman Sachs Group, Inc. (NYSE:GS).

Tweedy Browne’s 13f for fourth quarter, reveals major acquisitions in Halliburton Company (NYSE:HAL), Canadian Natural Resource Ltd (NYSE:CNQ), Joy Global Inc. (NYSE:JOY) and Heineken N.V. (ADR) (PINK:HINKY) new holdings that we reported towards the end of January. Joy Global is also a long position of Alex Roepers’ Atlantic Investments, the holding detracted last year.

Tweedy Browne made significant additions to its existing positions in  Cisco Systems, Inc. (NASDAQ:CSCO), Devon Energy Corporation (NYSE:DVN) and continues to buy more Berkshire Hathaway Inc. (NYSE:BRK.B), the position was increased by 900 percent.  The firm also bought more shares of GlaxoSmithKline plc (ADR) (NYSE:GSK), Wells Fargo & Company (NYSE:WFC) and Union Pacific Corporation (NYSE:UNP). Tweedy exited its positions in Connecticut Water Service, Inc. (NASDAQ:CTWS) and Fisher Communications, Inc. (NASDAQ:FSCI). Its holding in 3M Co (NYSE:MMM) was reduced by 85 percent, the firm now holds only 106,557 shares of the company.

More 13fs from famous value hedge funds will be filed this week and we’ll keep you updated of relevant changes in their portfolios.