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 mainly open-market insider purchases and sales filed at the Securities and Exchange Commission Monday, June 18, 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.
Opko Health (OPK) Frost Phillip MD et al CEO,CB,BO 200,000 917,889
Nanosphere (NSPH) Slezak Mark DIR,BO 309,075 627,200
MVC Capital (MVC) Tokarz Michael T CB,DIR 30,000 378,300
Kinder Morgan (KMI) Miller Michael Jaye DIR 10,000 314,000
Ambassadors (EPAX) Bandera Partners BO 55,023 274,688
Global Partners (GLP) Global Gp PT,DIR 10,400 222,340
United Therapeutics (UTHR) Rothblatt Martine A CEO,DIR 4,130 198,225
Owens Corning (OC) Morris W Howard DIR 4,900 136,554
Snyder S Lance (LNCE) Warehime Michael A CB,DIR,BO 4,572 118,415
Tempur Pedic International (TPX) Dilsaver Evelyn S DIR 4,500 106,200
Source: Insider Insights
Tiffany (TIF) May Peter W DIR 1,380,000 73,890,600
Sandridge Mississippian Trust I (SDT) Sandridge Energy BO 950,000 24,700,000
Visa (V) Pollitt Byron H Jr CFO 85,000 10,030,000
MWI Veterinary Supply (MWIV) Cleary James F Jr PR,CEO,DIR 76,394 7,352,890
Gartner (IT) Sondergaard Peter VP 33,385 1,428,648
Priceline Com (PCLN) Boyd Jeffery H PR,CEO,DIR 2,000 1,284,000
Linkedin (LNKD) Sordello Steven J VP,CFO 10,000 1,000,000
Linkedin (LNKD) Scott James Kevin VP 9,000 894,466
Dunkin Brands (DNKN) Luther Jon L DIR 24,000 828,960
American Capital (ACAS) Graff Brian VP 80,410 744,597
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

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.