Calpine Insiders Buy $23 Million Worth

Which insiders are selling and buying chunks of stocks?

Below are lists of the top 10 open-market insider purchases and sales filed at the Securities and Exchange Commission on Thursday as ranked by dollar value. Company executives and directors are in the best position to assess the attractiveness of their firms' shares, and here is how many of them are voting their wallets!

Dollar value is only one metric to assess the importance of an insider transaction, however. For more value-added tables on a weekly basis, and fundamentally researched investment ideas inspired by insiders, subscribe to TheStreet.com's InsiderInsights newsletter. Whether you're a growth, value, income, momentum, or microcap investor, insider data can help you find great investment ideas.

Company Name (Ticker) Filer Name Title(s) Shares Bought Dollar Value Calpine (CPN) Spo Advisory Corp  BO 1,234,300 $12,881,560 Autozone (AZO) Lampert Edward S  BO 117,000 $12,424,230 Calpine (CPN) Spo Advisory Corp  BO 1,300,000 $11,895,000 Greenfield Online (SRVY) Microsoft Corp  BO 164,080 $2,871,400 Atlas America (ATLS) Cobalt Capital Mgt Inc  BO 70,000 $1,439,900 Linn Energy Llc (LINE) Jacobs Terrence S  DIR 91,000 $1,196,301 Prospect Capital (PSEC) Barry John F  CEO,DIR 70,000 $906,265 International Speedway (ISCA) Capital Circle Group LP BO 16,000 $424,713 Sinclair Broadcast (SBGI) Smith Robert E  DIR,BO 100,000 $378,720 Kapstone Paper (KPPC) Elm Ridge Capital Mgt LLC BO 50,000 $243,329

Company Name (Ticker) Filer Name Title(s) Shares Sold Dollar Value Boston Scientific (BSX) Abele John E  DIR 1,000,000 $9,331,663 Enersys (ENS) Gendell Jeffrey L Et Al  BO 347,507 $4,661,928 Quicksilver Resources (KWK) Morris Steven M  DIR 108,700 $1,054,120 Leucadia National (LUK) Jordan James E  DIR 25,000 $916,787 Monsanto Co New (MON) Steiner Gerald A  VP 9,000 $828,000 Wabash National Corp De (WNC) Gendell Jeffrey L Et Al  BO 87,000 $656,850 MKS Instruments (MKSI) Bertucci John R  DIR 35,000 $625,663 Apartment Investment (AIV) Considine Terry  CB,CEO,DIR 29,705 $594,326 Natus Medical (BABY) Nierenberg David  BO 26,547 $539,170 Life Partners Holdings (LPHI) Pardo Family Holdings Ltd  BO 15,000 $527,250

Key to Titles: A=Assistant, AI=Affiliated Investor, AO=Accounting Officer, BD=Business Development, BO=Beneficial Owner, CAO=Chief Accounting Officer, CB=Chairman, CCO=Chief Compliance Officer, CEO=Chief Executive Officer, CFO=Chief Financial Officer, CIO=Chief Information Officer, CO=Compliance Officer, COO=Chief Operating Officer, CT=Controller, CTO=Chief Technology Officer, DIR=Director, F=Founder, FO=Financial Officer, GC=General Counsel, HR=Human Resources, IO=Information Officer, IR=Investor Relations, LO=Legal Officer, MD=Managing Director, O=Officer, OO=Operating Officer, PR=President, PT=Partner, REL=Relative of an insider, SEC=Secretary, SH=Shareholder, SO=Sales Officer, TO=Technology Officer, TR=Treasurer, TT=Trustee, VCB=Vice Chairman, VP=Vice President, X=Ex Officer or other title displayed.

Source: InsiderInsights.com

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