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 Thursday, June 23, 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.

Texas Industries (TXI) Longleaf Partners Funds Trust BO 224,088 $8,923,753
Navistar International (NAV) Clariond Eugenio DIR 56,000 $3,022,270
Titanium Metals (TIE) Simmons Harold C CB,DIR
BO
112,200 $1,909,734
Vantage Drilling (VTG) Su Hsin Chi BO 979,300 $1,742,866
Donegal Group (DGICA) Shepard Gregory M BO 35,715 $448,268
Valhi (VHI) Simmons Harold C CB,DIR
BO
6,000 $275,196
Opko Health (OPK) Frost Phillip Md CEO,CB
DIR,BO
50,000 $170,496
Seattle Genetics (SGEN) Berger Franklin M DIR 7,000 $140,274
Independence Holding (IHC) Geneve Holdings BO 6,800 $69,278
Eternal Energy (EERG) Rudisill McAndrew BO 212,500 $66,225
Source: www.InsiderInsights.com
Aaron S (AAN) Loudermilk R Charles Sr CB,DIR
BO
332,509 $8,645,573
Clean Harbors (CLH) McKim Alan S CB,CEO
DIR
23,271 $2,263,731
Avago Technologies (AVGO) Ingram Bryan VP 47,482 $1,671,675
Fortinet (FTNT) Xie Michael VP,CTO
DIR
40,000 $983,528
NII Holdings (NIHD) Butvilofsky Ruben PR 23,333 $941,716
Dolby Laboratories (DLB) Dolby Ray BO 20,000 $849,698
Ashford Hospitality Trust (AHT) Kessler Douglas A PR 60,336 $790,607
Global Power Equipment Group Inc (GLPW) PPM America Capital BO 24,856 $641,790
Omnivision Technologies (OVTI) Li Hongjun VP 18,320 $573,158
Aerovironment (AVAV) Conver Timothy E CB,PR
CEO,DIR
BO
16,600 $562,035
Source: www.InsiderInsights.com

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 InsiderInsights.com, 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 TheStreet.com 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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