By Jonathan Moreland, founder of 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 Tuesday 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.

Westport Innovations (WPRT) Douglas Kevin BO 200,000 $3,777,280
C H Robinson Worldwide (CHRW) Ezrilov Robert DIR 28,845 $1,773,968
VMware (VMW) Emc Corp BO 16,000 $996,009
Freeport Mcmoran Copper Gold (FCX) Johnston J Bennett DIR 12,000 $970,800
Sl Industries (SLI) Steel Partners II LP BO 14,234 $136,088
Image Sensing Systems (ISNS) Marxe Austin W Greenhouse David M BO 8,800 $118,028
TCW Strategicome Fund (TSI) Kane Steve O 20,800 $100,048
Philip Morris International (PM) Marchionne Sergio DIR 1,500 $76,337
Schulman A (SHLM) Miller Gary A VP 2,830 $74,490
Ocean Bio Chem (OBCI) Dornau Gregor M DIR,VP 20,000 $41,000
Tempur-Pedic Intl (TPX) Masto Christopher A DIR 554,079 $19,326,760
Dynegy (DYN) LS Power Development LLC BO 2,718,993 $3,524,356
Americredit (ACF) Berce Daniel E PR 100,000 $2,593,400
Towers Watson (TW) Haley John J CB,CEO,
50,000 $2,406,290
Apple (AAPL) Papermaster Mark D VP 8,000 $2,161,130
Kaiser Aluminum (KALU) Veba For Retirees Of Kaiser Aluminum BO 42,440 $1,747,299
Intuitive Surgical (ISRG) Duggan Robert W DIR 4,500 $1,630,691
Juniper Networks (JNPR) Stensrud William DIR 50,000 $1,478,630
Ultratech (UTEK) Zafiropoulo Arthur W CB,CEO,
77,800 $1,248,184
Community Health Sys (CYH) Portacci Michael PR 30,290 $1,227,526

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, 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.