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:

China Recycling Energy Corp (CREG, Financial): CEO and Chairman of the Board, 10% Owner Guohua Ku Bought 13,829,074 Shares

CEO and Chairman of the Board, 10% Owner of China Recycling Energy Corp (CREG, Financial) Guohua Ku bought 13,829,074 shares on Sept. 15 at an average price of $1.27. China Recycling Energy Corporation was incorporated on May 8, 1980, under the laws of the State of Colorado. China Recycling Energy has a market cap of $71.916 million; its shares were traded at around $1.27 with a P/E ratio of 4.10 and P/S ratio of 0.96. China Recycling Energy had an annual average earnings growth of 5.80% over the past 5 years.

10% Owner Ltd. Cagp, sold 248,044 shares of CREG stock on Sept.10 at the average price of 1.5. Ltd. Cagp, owns at least 10,477,551 shares after this. The price of the stock has decreased by 15.33% since.

Opko Health (OPK, Financial): CEO & Chairman, 10% Owner Phillip Md Et Al Frost Bought 120,000 Shares

CEO & Chairman, 10% Owner of Opko Health Inc (OPK, Financial) Phillip Md Et Al Frost bought 120,000 shares during the past week at an average price of $8.46. Opko Health was originally incorporated in Delaware in October 1991 under the name Cytoclonal Pharmaceutics. Opko Health Inc has a market cap of $3.61 billion; its shares were traded at around $8.46 with and P/S ratio of 38.45. Opko Health Inc had an annual average earnings growth of 4.40% over the past 10 years.

Mario Gabelli (Trades, Portfolio) owns 15,000 shares as of June 30, which accounts for 0.0007% of the $19.12 billion portfolio of GAMCO Investors. George Soros (Trades, Portfolio) owns 235,600 shares as of 06/30/2014, a decrease of 84.24% of from the previous quarter. This position accounts for 0.016% of the $13.27 billion portfolio of Soros Fund Management LLC.

Vice Chairman & CTO Jane Ph D Hsiao bought 10,000 shares of OPK stock on April 15 at the average price of 8.03. Jane Hsiao owns at least 21,338,212 shares after this. The price of the stock has increased by 5.35% since.

Leidos Holdings Inc (LDOS, Financial): CEO Roger A Krone Bought 15,000 Shares

CEO of Leidos Holdings Inc (LDOS, Financial) Roger A Krone bought 15,000 shares on Sept. 12 at an average price of $36.39. SAIC, Inc. is a Delaware corporation. It is a provider of scientific, engineering, systems integration and technical services and solutions to all branches of the U. Leidos Holdings Inc has a market cap of $2.65 billion; its shares were traded at around $36.39 with and P/S ratio of 0.54. The dividend yield of Leidos Holdings Inc stocks is 3.57%.

Leidos Holdings recently reported its second quarter 2014 financial results. Revenues for the second quarter of fiscal year 2015 were $1.31 billion, reflecting a revenue contraction of 10 percent, as compared to $1.46 billion in the prior year.

Joel Greenblatt (Trades, Portfolio) bought 53,091 shares in the quarter that ended on June 30, which is 0.025% of the $7.99 billion portfolio of Gotham Asset Management, LLC. John Keeley (Trades, Portfolio) owns 8,100 shares as of June 30, which accounts for 0.0056% of the $5.57 billion portfolio of Keeley Asset Management Corp. Private Capital (Trades, Portfolio) owns 170,976 shares as of 06/30/2014, which accounts for 0.75% of the $873 million portfolio of Private Capital (Trades, Portfolio) Management.

Hallmark Financial Services Inc (HALL, Financial): President & CEO Naveen Anand Bought 50,000 Shares

President & CEO of Hallmark Financial Services Inc (HALL, Financial) Naveen Anand bought 50,000 shares during the past week at an average price of $10.69. Hallmark Financial Services is a property/casualty insurance group that serves businesses and individuals in specialty and niche markets. Hallmark Financial Services Inc has a market cap of $203.756 million; its shares were traded at around $10.69 with a P/E ratio of 13.10 and P/S ratio of 0.57.

Hallmark recently announced its second quarter 2014 financial results. The company reported second quarter 2014 net income of $1.7 million, or $0.09 per diluted share, compared to net loss of $3.2 million, or $0.16 per diluted share, reported for second quarter 2013.

Executive Chairman, 10% Owner Mark E Schwarz bought 38,400 shares of HALL stock on April 21 at the average price of 8.1. Mark Schwarz owns at least 4,983,715 shares after this. The price of the stock has increased by 31.98% since.

Ulta Salon Cosmetics & Fragrances Inc (ULTA, Financial): CEO Mary Dillon Bought 4,000 Shares

CEO of Ulta Salon Cosmetics & Fragrances Inc (ULTA, Financial) Mary Dillon bought 4,000 shares on Sept. 17 at an average price of $120.35. Ulta Salon Cosmetics & Fragrances, Inc. is a beauty retailer that provides one-stop shopping for mass and salon products and salon services in United States. Ulta Salon Cosmetics & Fragrances Inc has a market cap of $7.75 billion; its shares were traded at around $120.35 with a P/E ratio of 34.30 and P/S ratio of 2.65. Ulta Salon Cosmetics & Fragrances Inc had an annual average earnings growth of 33.40% over the past 5 years.

Joel Greenblatt (Trades, Portfolio) bought 124,896 shares in the quarter that ended on 06/30/2014, which is 0.14% of the $7.99 billion portfolio of Gotham Asset Management, LLC. John Griffin (Trades, Portfolio) owns 1,851,293 shares as of 06/30/2014, an increase of 25.83% from the previous quarter. This position accounts for 1.7% of the $10.14 billion portfolio of Blue Ridge Capital. Julian Robertson (Trades, Portfolio) sold out his holdings in the quarter that ended on 06/30/2014.

Director Dennis K Eck bought 16,000 shares of ULTA stock on Sept. 17 at the average price of 119.69. Dennis K Eck owns at least 502,297 shares after this. The price of the stock has increased by 0.55% since.