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 on Monday, April 16, 2012 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.

Seachange International (SEAC) Feld Peter A DIR 150,000 1,218,000
Magicjack Vocaltec (CALL) Vento Gerald T DIR 22,000 507,602
Opko Health (OPK) Frost Phillip MD CEO,CB,DIR,BO 100,000 439,847
Netsol Technologies (NTWK) Ghauri Naeem CEO,DIR 150,000 64,500
Netsol Technologies (NTWK) Ghauri Najeeb CB,CEO,DIR 150,000 64,500
Netsol Technologies (NTWK) Ghauri Salim U PR,DIR 150,000 64,500
MRV Communications (MRVC) Martin William C BO 60,000 62,300
Valhi (VHI) Simmons Harold C CB,DIR,BO 851 43,827
Hallmark Financial (HALL) Detroit Stoker O 5,100 36,430
Widepoint (WYY) Mansouri Michael CEO 39,602 35,397
Tractor Supply (TSCO) Wright James F CB,CEO,DIR 63,207 6,001,505
Western Refining (WNR) Foster Paul L CB,DIR,BO 300,000 5,678,640
TJX Companies (TJX) Cammarata Bernard DIR 100,000 4,000,000
JPMorgan Chase (JPM) Maclin Samuel Todd VP 49,000 2,109,720
Western Refining (WNR) Franklin Mountain Investments BO 100,000 1,892,880
Conns (CONN) Stephens Warren A BO 68,100 1,197,212
Jabil Circuit (JBL) Morean William D DIR 39,550 923,630
Servicesource International (SREV) Smerklo Michael A CEO,CB,DIR 50,000 777,396
Verint Systems (VRNT) Parcell David MD 20,279 621,754
Monotype Imaging (TYPE) Shaw Douglas J PR,CEO,DIR 25,000 365,468

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.