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, Dec. 21, 2010 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 146,000 $4,215,020
New York Mort Tr (NYMT) Harvest Capital Strat BO 190,300 $1,286,857
Philip Morris Intl (PM) Marchionne Sergio DIR 6,000 $360,536
General American Investors (GAM) Neidich Daniel DIR 12,400 $325,550
China Medical Tech (CMED) Tsang Takyung CFO,DIR 16,700 $187,780
Arbinet (ARBX) Edidin Eric J BO 21,799 $177,382
Bank Of Kentucky (BKYF) Zapp Robert W PR,CEO
DIR
6,408 $118,379
Cadence Financial (CADE) Galloway James C DIR 23,000 $56,450
DTF Tax Free Inc (DTF) Heaney Timothy M VP,FO 2,190 $31,317
Mutualfirst Financial (MFSF) Crull Linn A DIR 1,961 $18,237
Source: www.InsiderInsights.com
Federated Investors (FII) McGonigle John W VCB,SEC
VP,DIR
326,321 $8,659,227
Orexigen Therapeutics (OREX) Powell Michael DIR 456,254 $3,913,570
TD Ameritrade Holding Corp (AMTD) Ricketts J Joe DIR,BO 155,629 $2,956,951
Contango Oil & Gas Co (MCF) Schoonover Steven L DIR 50,000 $2,910,841
TRC Companies (TRR) Kellogg Peter R BO 750,000 $2,062,500
Discover Financial Svs (DFS) Hochschild Roger C PR,COO 100,000 $1,826,000
Rentech (RTK) Williams John A DIR 1,208,582 $1,501,813
DDI Corp (DDIC) Miller Lloyd I III BO 123,813 $1,495,413
Salesforce.Com (CRM) Benioff Marc CB,CEO
DIR,BO
10,000 $1,381,589
Cooper Industries (CBE) Klebe Terry A VCB 18,000 $1,054,825
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.