TD Ameritrade Director Sells $15.7M 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 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.

Also check out Stockpickr's weekly "Top Stocks With Insider Buying, Buybacks."

Company Name (Ticker) Filer Name Title(s) Shares Bought Dollar Value Semgroup Energy LP (SGLP) Msd Capital L P BO 97,647 $514,999 Verizon Communications (VZ) Mcadam Lowell C CEO,PR, VP 16,700 $510,337 Boston Scientific (BSX) Mario Ernest DIR 50,000 $424,650 Spectrum Pharmaceuticals (SPPI) Kumaria Shyam K VP,FO 85,000 $229,500 Cincinnati Financial (CINF) Schiff John J Jr CB,DIR 9,000 $205,650 Millennium India Acquisition (SMCG) Sanlam Ltd BO 253,506 $195,155 Collectors Universe (CLCT) Duncan Richard Kenneth Sr BO 26,294 $106,506 Cardionet (BEAT) Thurman Randy H CB,CEO, PR,DIR 5,555 $99,795 Boulder Growth & Inc Fund (BIF) Ernest Horejsi Trust No 1b BO 20,060 $89,116 Angiotech Pharmaceuticals (ANPI) Hunter William L CEO,PR, DIR 147,738 $80,463

Company Name (Ticker) Filer Name Title(s) Shares Sold Dollar Value MICROSOFT CORP (MSFT) GATES WILLIAM H III DIR 1,000,000 $19,888,100 TD AMERITRADE HOLDING CORP (AMTD) RICKETTS J JOE DIR,BO 946,584 $15,668,735 STRYKER CORP (SYK) STRYKER RONDA E DIR 60,000 $2,427,487 JACOBS ENGINEERING GROUP (JEC) WATSON NOEL G CB,DIR 50,000 $2,105,960 BOSTON SCIENTIFIC CORP (BSX) ABELE JOHN E DIR 200,000 $1,698,400 SOURCEFIRE (FIRE) GULERI TIM DIR 131,908 $1,531,452 VALMONT INDUSTRIES (VMI) MEANEY E ROBERT VP,SEC 15,000 $1,018,998 AMERISTAR CASINOS (ASCA) NEILSEN RAY H CB,DIR, BO 40,000 $888,906 MANPOWER WI (MAN) BECK BARBARA VP 18,758 $825,352 STRYKER CORP (SYK) STRYKER RONDA E DIR 20,000 $823,086

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