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 open-market insider purchases and sales filed at the Securities and Exchange Commission Thursday, August 18, 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.

VMware (VMW) EMC Corp BO 595,918 $47,987,712
Mueller Industries (MLI) Leucadia National Corp BO 555,000 $22,458,038
Leap Wireless International (LEAP) Rachesky Mark H Md DIR,BO 1,930,000 $18,802,060
Assured Guaranty (AGO) Ross Wilbur L Jr DIR 400,000 $4,800,000
Federal Mogul (FDML) Icahn Carl C CB,DIR
192,168 $3,200,116
Transdigm Group (TDG) Small Robert J DIR 22,678 $2,046,463
Western Asset Claymore Inflation Linked Opp Fd (WIW) Cascade Investment BO 86,696 $1,117,902
Valhi (VHI) Simmons Harold C CB,DIR
18,000 $869,000
ADPT Corp (ADPT) SPH Group BO 275,500 $779,665
Oasis Petroleum (OAS) Collins Ted Jr DIR 25,000 $659,500
MGM Resorts (MGM) Tracinda BO 20,000,000 $214,874,000
Tutor Perini (TPC) Tutor Ronald N CB,CEO
450,000 $6,220,500
Accretive Health (AH) Spiegel Arthur H Iii DIR 141,931 $4,063,243
City National (CYN) Bloch Richard DIR 20,000 $849,400
L3 Communications (LLL) Washkowitz Alan H DIR 12,474 $818,419
Procter & Gamble (PG) Nagrath Moheet HR 11,948 $738,506
EMC Corp (EMC) Coviello Arthur W Jr CB 13,000 $291,600
Cardiovascular Systems (CSII) Martin David PR,CEO
18,854 $258,182
RLI Corp (RLI) Dondanville Joseph E VP,CFO 3,600 $221,668
Simmons First National (SFNC) Bartlett David L PR,COO 8,894 $193,871

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.