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, Dec. 13, 2013 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.

                 Top 10 Open-Market Purchases
Esterline Tech (ESL) Winship Henry W DIR 103,528 9,507,702
Nuance Comms (NUAN) Icahn Carl C BO 423,400 5,979,328
Kindred Biosciences (KIN) Nodelman Oleg DIR 400,000 2,800,000
Xg Technology (XGTI) Schmitt George F DIR,BO 1,142,800 1,999,900
Aircastle (AYR) Marubeni DIR,BO 30,000 543,306
Opko Health (OPK) Frost Phillip Md CEO,CB,BO 50,000 472,196
Athlon Energy (ATHL) Stevens Mark A DIR 10,000 306,468
Global Partners (GLP) Global Gp PT,DIR 7,500 258,825
Corp Office Props Tr (OFC) Omega Healthcare DIR 10,000 220,909
Crestwood Midstream (CMLP) Lumpkins David DIR 10,000 213,112
Source: Insider Insights
                    Top 10 Open-Market Sales
U S Silica (SLCA) Shinn Bryan Adair CEO,DIR 4,517,582 156,760,096
Noodles (NDLS) Pub Sector Pension BO 2,121,689 80,454,448
Visa (V) Fernandez Carbajal DIR 40,600 8,188,462
Mylan (MYL) Coury Robert J CB,DIR 149,465 6,220,405
Jth Holding (LTAXA) Datatax Bus Svs BO 120,373 2,789,043
3d Systems (DDD) McAlea Kevin VP 29,658 2,298,495
Tutor Perini (TPC) Tutor Ronald N CB,CEO,BO 77,601 1,983,694
Genesco (GCO) Dennis Robert J CB,CEO,DIR 23,008 1,624,657
Fossil (FOSL) Shroff Jal S DIR 12,762 1,562,169
PVH (PVH) Murry Paul Thomas PR 10,355 1,367,984
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 adviser 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.