By Jonathan Moreland, founder of InsiderInsights.com 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.
American Superconductor (AMSC) Douglas Kevin BO 200,000 $6,403,500
Blackrock (BLK) Grosfeld James DIR 41,000 $6,247,269
State Bancorp (STBC) Obrien Thomas CEO,PR,
DIR
25,000 $223,750
ATS (ATSC) Osmium Special Situations BO 55,737 $160,935
Santander Bancorp (SBP) Calero Maria DIR 9,365 $118,842
Affymetrix (AFFX) Barabe Timothy C CFO 10,000 $45,000
Southern National Bancorp (SONA) Derrico Georgia S CB,DIR 5,000 $35,000
Clearone Communications (CLRO) Bagley Edward D BO 10,000 $30,000
Education Realty Trust (EDR) Weakley Wendell W DIR 4,300 $29,670
Tri County Financial (TCFC) Stone Joseph V Jr DIR 2,000 $24,260
Source: www.InsiderInsights.com
Morgan Stanley (MS) China Investment Corp BO 4,625,000 $125,078,750
American Express (AXP) Gilligan Edward P VCB 150,000 $6,730,860
First Solar (FSLR) Estate Of John T Walton BO 33,210 $4,649,400
First Solar (FSLR) JTW Trust No 1 Uad 9 19 02 BO 33,210 $4,649,400
PNC Financial Services (PNC) Whitford Thomas K VCB 30,000 $1,856,400
IXIA (XXIA) Rager Jon F DIR 150,000 $1,698,150
Momenta Pharmaceuticals (MNTA) Sasisekharan Ram DIR 75,000 $1,649,503
Medassets (MDAS) Wesson Bruce F DIR 66,920 $1,618,481
Momenta Pharmaceuticals (MNTA) Bishop John E VP 67,950 $1,411,206
Dolby Laboratories (DLB) Dolby Ray DIR,BO 20,000 $1,380,492
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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