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 Friday, April 15, 2011 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.

Authentidate Holding (ADAT) Lazarus Investment BO 533,869 $550,268
Hallmark Financial Services (HALL) Detroit Stoker Co O 59,619 $503,335
Valhi (VHI) Simmons Harold C CB,DIR
5,000 $143,750
Banyan Rail Services (BARA) Marino Gary O PR,CEO
20,000 $40,000
Skypeople Fruit Juice (SPU) Xue Yong Ke CEO,DIR 10,000 $36,600
Howard Hughes (HHC) Model Allen J DIR 500 $31,925
Compass Diversified Holdings (CODI) Edwards Harold S O 1,475 $21,727
Adcare Health Systems (ADK) Hackett Peter J DIR 4,000 $19,000
Dune Energy (DUNR) UBS BO 18,560 $15,212
Safestitch Medical (SFES) Spragens Jeffrey G PR,CEO
11,500 $13,169
Intralinks (IL) TA Associates DIR,BO 330,000 $9,290,644
Kellogg (K) Kellogg WK Foundation BO 150,000 $8,270,130
IRobot (IRBT) Greiner Helen DIR 137,200 $4,836,228
MetroPCS Communications (PCS) TA Associates DIR 200,000 $3,299,970
ValueVision Media (VVTV) Stewart Keith R CEO,DIR 500,000 $2,875,250
Stryker (SYK) Stryker Ronda E DIR 27,000 $1,621,170
Intermec (IN) Unitrin BO 120,000 $1,332,604
Verint Systems (VRNT) Fante Peter LO,CCO 26,453 $909,650
Northern Oil & Gas (NOG) Gilbertson Ryan Randall PR,DIR 37,291 $880,743
Northern Oil & Gas (NOG) Reger Michael Lewis DIR 37,291 $880,735

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.

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