According to GuruFocus Insider Data, these are the largest CEO buys during the past week. The overall trend of CEOs is illustrated in the chart below:

Sigma Designs, Inc. (SIGM, Financial): President & CEO Thinh Q Tran Bought 454,546 Shares

President & CEO of Sigma Designs, Inc. (SIGM) Thinh Q Tran bought 454,546 shares on 12/20/2013 at an average price of $4.65. Sigma Designs, Inc., a California corporation was incorporated in January 1982. Sigma Designs, Inc. has a market cap of $160.902 million; its shares were traded at around $4.65 with and P/S ratio of 0.77.

John Rogers owns 1,967,145 shares as of 09/30/2013, an increase of 16.06% from the previous quarter. This position accounts for 0.16% of the $6.87 billion portfolio of Ariel Capital Management.

Director Eric Singer sold 343,410 shares of SIGM stock on 12/20/2013 at the average price of 5.5. Eric Singer owns at least 464,499 shares after this. The price of the stock has decreased by 15.45% since.

Calamos Asset Management, Inc. (CLMS, Financial): Chairman, CEO & Global Co-CIO, 10% Owner John P Sr Calamos Bought 74,505 Shares

Chairman, CEO & Global Co-CIO, 10% Owner of Calamos Asset Management, Inc. (CLMS) John P Sr Calamos bought 74,505 shares during the past week at an average price of $11.99. Calamos Asset Management, Inc., is a global asset management firm that offers strategies to fulfill a range of asset allocation goals through a multi-team platform. Calamos Asset Management, Inc. has a market cap of $245.547 million; its shares were traded at around $11.99 with a P/E ratio of 20.20 and P/S ratio of 0.88. The dividend yield of Calamos Asset Management, Inc. stocks is 4.18%.

Calamos Asset Management recently reported its third quarter 2013 financial results. Non-GAAP diluted earnings per share was $0.20 for the third quarter compared to $0.22 in the previous quarter. Non-GAAP net income attributable to Calamos Asset Management, Inc. was $4.1 million for the quarter compared to $4.5 million last quarter.

Mario Gabelli owns 126,000 shares as of 09/30/2013, which accounts for 0.0074% of the $17.03 billion portfolio of GAMCO Investors.

SVP & CFO Nimish S Bhatt bought 364 shares of CLMS stock on 11/20/2013 at the average price of 10.47. Nimish S Bhatt owns at least 90,543 shares after this. The price of the stock has increased by 14.52% since.

Opko Health, Inc. (OPK, Financial): CEO & Chairman, 10% Owner Phillip Md Et Al Frost Bought 62,100 Shares

CEO & Chairman, 10% Owner of Opko Health, Inc. (OPK) Phillip Md Et Al Frost bought 62,100 shares during the past week at an average price of $8.57. Opko Health, Inc. was originally incorporated in Delaware in October 1991 under the name Cytoclonal Pharmaceutics, Inc. Opko Health, Inc. has a market cap of $3.5 billion; its shares were traded at around $8.57 with and P/S ratio of 30.30.

George Soros bought 745,000 shares in the quarter that ended on 09/30/2013, which is 0.072% of the $9.14 billion portfolio of Soros Fund Management LLC. Mario Gabelli owns 15,000 shares as of 09/30/2013, which accounts for 0.0008% of the $17.03 billion portfolio of GAMCO Investors.

Gordman's Stores, Inc. (GMAN, Financial): Dir, Pres, CEO & Secretary Jeffrey J Gordman Bought 15,000 Shares

Dir, Pres, CEO & Secretary of Gordman's Stores, Inc. (GMAN) Jeffrey J Gordman bought 15,000 shares on 12/20/2013 at an average price of $7.59. Gordmans Stores, Inc., was formed in Delaware in 2008. Gordman's Stores, Inc. has a market cap of $147.595 million; its shares were traded at around $7.59 with a P/E ratio of 11.00 and P/S ratio of 0.23.

GMAN recently reported its third quarter 2013 financial results. Net sales for the thirteen weeks ended November 2, 2013 increased 5.8% to $151.3 million from $143.1 million for the thirteen weeks ended October 27, 2012. Comparable store sales for the third quarter of fiscal 2013 decreased by 6.1% versus a 1.4% comparable store sales decrease in the third quarter of fiscal 2012.

SVP and CFO Michael D James bought 2,500 shares of GMAN stock on 12/17/2013 at the average price of 7.1. Michael D James owns at least 69,158 shares after this. The price of the stock has increased by 6.9% since.

Golub Capital BDC, Inc. (GBDC, Financial): CEO, 10% Owner David Golub Bought 5,000 Shares

CEO, 10% Owner of Golub Capital BDC, Inc. (GBDC) David Golub bought 5,000 shares on 12/23/2013 at an average price of $18.71. Golub Capital BDC, Inc. was formed in November 2009. Golub Capital Bdc, Inc. has a market cap of $810.256 million; its shares were traded at around $18.71 with a P/E ratio of 13.90 and P/S ratio of 7.70. The dividend yield of Golub Capital Bdc, Inc. stocks is 6.84%.

Golub Capital recently reported its fourth quarter 2013 financial results. Net investment income for the quarter ended September 30, 2013 was $12.4 million, or $0.31 per share, as compared to $12.0 million, or $0.32 per share, for the quarter ended June 30, 2013.

NWQ Managers bought 132,059 shares in the quarter that ended on 09/30/2013, which is 0.022% of the $10.53 billion portfolio of NWQ Investment Management Co. Scott Black owns 72,424 shares as of 09/30/2013, which accounts for 0.14% of the $881 million portfolio of Delphi Management, Inc..

10% Owner Lawrence E Golub bought 5,000 shares of GBDC stock on 12/23/2013 at the average price of 18.41. Lawrence E Golub owns at least 4,160,183 shares after this. The price of the stock has increased by 1.63% since.