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 Wednesday, November 16, 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.

Halozyme Therapeutics (HALO) Kirk Randal J DIR,BO 638,224 $5,211,428
Washington Post (WPO) Diller Barry DIR 3,000 $1,035,810
UGI Corp (UGI) Hermance Frank S DIR 30,000 $882,000
Cheesecake Factory (CAKE) Simon Herbert DIR 25,000 $688,500
Atp Oil & Gas (ATPG) Adams Burt A DIR 100,000 $649,000
Blue Nile (NILE) Vadon Mark C DIR 15,000 $484,089
Valhi (VHI) Simmons Harold C CB,DIR
5,000 $290,000
Netscout Systems (NTCT) Cadian Capital BO 16,175 $265,920
Getty Realty (GTY) Driscoll David B PR,CEO
15,000 $222,908
Sequenom (SQNM) Hixson Harry F Jr CEO,DIR 50,000 $209,400
Triumph Group (TGI) DBD Investors BO 3,441,112 $188,469,712
Google (GOOG) Page Lawrence CEO,DIR
55,556 $34,142,540
Mercadolibre (MELI) Levy Anton J DIR 277,928 $23,895,673
Autonation (AN) Bill And Melinda Gates Foundation Trust O 487,968 $16,428,809
F5 Networks (FFIV) McAdam John PR,CEO
85,000 $9,468,367
Questcor Pharmaceuticals (QCOR) Blutt Mitchell J Md DIR 150,000 $6,591,000
Estee Lauder (EL) Freda Fabrizio PR,CEO
44,237 $5,102,663
Markel (MKL) Markel Steven A VCB,DIR 12,500 $4,957,446
Western Refining (WNR) Foster Paul L CB,DIR
127,500 $1,975,834
Primoris Services (PRIM) Rosenfeld Eric DIR 103,448 $1,472,657

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, 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.