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, March 18, 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.
Lhc (LHCG) Coliseum DIR,BO 27,201 576,044
Park Ohio (PKOH) Crawford Edward CEO,CB,BO 20,000 558,773
Park City (PCYG) Hodge Ronald DIR 138,889 500,000
Chiquita (CQB) Lonergan Edward PR,CEO,DIR 50,800 367,284
Synacor (SYNC) Montgomery M. DIR 40,000 120,800
JMP (JMP) Karmin Kenneth DIR 16,798 110,535
Castle A M (CAS) Dolan Scott PR,CEO,DIR 6,000 103,080
Hertz (HTZ) BofA BO,DIR 4,300 93,022
Amicus (FOLD) Barer Sol DIR 25,000 85,000
Skullcandy (SKUL) Wescoat Kyle VP,CFO 15,000 78,750
Source: Insider Insights
Kosmos (KOS) Warburg Pincus DIR,BO 6,789,275 74,682,028
LinkedIn (LNKD) Hoffman Reid DIR,BO 83,334 14,487,454
Ocwen (OCN) Wish Barry DIR 297,400 12,108,968
Mastercard (MA) Mastercard BO 16,639 8,658,572
LinkedIn (LNKD) Weiner Jeff CEO,DIR 37,000 6,432,504
Epl (EPL) Wexford Capital BO 221,656 6,292,791
S. Madden (SHOO) Madden Steven BO 100,000 4,473,000
Nextera (NEE) Hay Lewis III CB,DIR 60,000 4,461,960
Southwest En. (SWN) Scharlau Charles DIR 108,000 4,162,018
Owens Corning (OC) Thaman Michael CB,PR,CEO 100,000 4,083,000
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.

This article was written by a staff member of TheStreet.