By Jonathan Moreland, founder of Insider Insights and author of Profit From Legal Insider Trading.

NEW YORK ( TheStreet) -- Which insiders are selling and buying chunks of stocks?

Below are lists of the top 10 mainly open-market insider purchases and sales filed at the Securities and Exchange Commission Thursday, August 11, 2011 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! Please note, however, that these are factual lists, not buy and sell recommendations. Dollar value is only one metric to assess the importance of an insider transaction.

Cintas (CTAS) Summer Hill Partners BO 650,000 $17,846,500
VMware (VMW) Emc Corp BO 169,800 $14,930,451
Gaylord Entertainment (GET) TRT Holdings BO 508,400 $11,720,908
Nasdaq Omx Group (NDAQ) Investor Ab BO 350,000 $7,479,165
Halozyme Therapeutics (HALO) Kirk Randal J DIR,BO 1,000,000 $5,945,417
Century Aluminum (CENX) Glencore Ag BO 503,343 $4,688,590
Leap Wireless International (LEAP) Rachesky Mark H Md DIR,BO 500,000 $3,228,750
Tutor Perini (TPC) Klein Michael R DIR 150,000 $1,858,500
Equity One (EQY) Katzman Chaim CB,DIR
111,700 $1,776,403
Sun Bancorp (SNBC) Ross Wilbur L Jr DIR,BO 622,073 $1,772,908
Exco Resources (XCO) Miller Douglas H CB,CEO
2,428,843 $32,847,720
AMC Networks (AMCX) Luxor Capital BO 551,237 $17,717,794
Tutor Perini Corp (TPC) Tutor Ronald N CB,CEO
450,000 $5,517,198
HFF (HF) Fowler John DIR 300,000 $3,928,500
Priceline.Com (PCLN) Soder Chris CEO 7,000 $3,577,000
SBA Communications (SBAC) Stoops Jeffrey CEO,PR
50,000 $1,692,500
Heartland Payment Systems (HPY) Niehaus Robert H DIR 82,409 $1,630,434
RLI Corp (RLI) Dondanville Joseph E VP,CFO 25,000 $1,472,329
Marsh & McLennan (MMC) Duperreault Brian PR,CEO
50,000 $1,357,600
Pegasystems (PEGA) Jones Richard H DIR 14,300 $607,914

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, EVP=Executive Vice President, 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.

Jonathan Moreland is the founder of, which produces a weekly newsletter and offers professional screening and alerting tools to analyze a proprietary, real-time insider data feed. He is also the principal of Insider Asset Management, a registered investment advisor in New York. Mr. Moreland has been analyzing insider data professionally for two decades and has been a contributor to since 2001. A fundamental analyst with an MBA in finance, Mr. Moreland long ago identified insider data as an excellent first screen to determine where to focus his research efforts. He is quoted frequently in the media for his insider analysis and stock recommendations stemming from it. He is also author of Profit From Legal Insider Trading.

Under no circumstances does the information in this column represent a recommendation to buy or sell stocks. While he cannot provide investment advice or recommendations, Moreland appreciates your feedback; click here to send him an email.