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 Friday, October 5, 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.
Wausau Paper (WPP) Starboard Value BO 250,000 2,182,479
Tesla (TSLA) Musk Elon CEO,DIR,BO 35,398 999,994
Summit (SMLP) Lane Thomas K DIR 40,000 800,000
Texas Industries (TXI) Lanigan Bernard Jr DIR 10,000 414,425
Opko Health (OPK) Frost Phillip MD CEO,CB,BO 77,500 342,486
Fuller H B (FUL) Giertz James R VP,CFO 3,000 90,052
Immunovative (NVNC) Shaw Seth M CEO,DIR 175,000 35,648
Pope Resources (POPE) Dahl James H BO 565 29,493
Kingsway Financial (KFS) Stilwell Joseph DIR,BO 9,372 26,463
Mod Pac (MPAC) Lupp David B CFO,COO 4,926 20,000
Source: Insider Insights
Dollar (DG) Buck Holdings BO 35,529,420 1,801,874,560
RLJ (RLJA) Fir Tree BO 1,862,500 18,531,876
PHH (PHH) Scopia Fund Mgt BO 703,920 15,376,859
Ulta Salon (ULTA) Diromualdo Robert F DIR 66,030 6,546,207
Liberty (LBTYA) Cole John P Jr DIR 71,277 4,257,847
Medivation (MDVN) Hung David PR,CEO,DIR 50,000 2,895,780
Walker (WD) Credit Suisse Ag BO 109,927 1,705,979
Medidata (MDSO) Sherif Tarek CB,CEO,DIR 40,000 1,578,856
Lithia (LAD) Lithia Holding Co BO 42,600 1,502,799
Medidata (MDSO) De Vries Glen Michael PR,DIR 27,604 1,097,869
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.