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

NEW YORK ( TheStreet) -- It is a victory for common sense. Tracking the trading behavior of company executives, directors and large shareholders in the stocks of firms they're registered in as "insiders" has proven to be profitable, according to both academic studies and (more importantly) the experience of professional investors.

Below are lists of the top 10 mainly open-market insider purchases and sales filed at the Securities and Exchange Commission Monday, October 1, 2012 as ranked by dollar value. Please note, however, that these are only factual lists, not buy and sell recommendations. Dollar value is only one metric to assess the importance of an insider transaction, and, frankly, often not even the most important metric that determines if an insider transaction is significant.

At, we find new investment ideas just about every day using these and more intricate insider screens to determine where we should focus our subsequent fundamental and technical analysis. And while stocks don't (or shouldn't) move up or down based on insider activity alone, insiders tend to be good indicators of when real stock-moving events like earnings surprises, corporate actions, and new products may be in the offing.

So use these regular Top Insider Trades columns as the initial research tools they are meant to be, and click the links in the tables to analyze a company's or insider's full insider history. Also feel free to contact us with any questions on our proprietary insider data, and how it is best analyzed.
Davita (DVA) Berkshire Hathaway BO 282,403 28,814,692
Nature Sun (NATR) Mesdag Willem DIR,BO 251,900 4,103,768
Ml Macadamia (NNUT) Ebrahimi Farhad BO 625,938 2,347,268
Contango Oil (MCF) Juneau John B PR,CEO,DIR 46,014 2,278,844
Community Bank (CBIN) Pfau Norman DIR 25,048 325,624
Food Tech (VIFL) Fort Ashford BO 33,306 207,496
Opko Health (OPK) Frost Phillip MD CEO,CB,BO 47,500 199,017
RCM Tech (RCMT) O Connell Michael BO 21,220 116,847
Inland Real Estate (IRC) Goodwin Daniel L DIR,BO 12,000 99,600
Smithfield Foods (SFD) Nelson David C DIR 5,000 97,800
Source: Insider Insights
Bard C R (BCR) Morfit G Mason DIR 110,161 11,574,905
Plug Power (PLUG) OJSC Third Generation BO 4,462,693 3,576,849
Google (GOOG) Doerr L John DIR 14,990 3,037,011
Seabright (SBX) Gergasko Richard J COO 146,347 1,615,666
Microsemi (MSCC) Peterson James J PR,CEO,DIR 80,862 1,611,332
Ditech (DITC) Miller Lloyd I III BO 1,000,000 1,410,000
Seabright (SBX) Press Clifford DIR 111,900 1,237,625
Encore Capital (ECPG) Black J Brandon PR,CEO,DIR 40,000 1,132,000
Guidewire (GWRE) Krausz Steven M DIR 28,790 896,143
Foster Wheeler Ag (FWLT) Masters J Kent CEO,DIR 36,835 888,368
Source: Insider Insights

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.