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 Friday, Aug. 19, 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.

Kior (KIOR) Peterson Stuart L BO 242,162 $2,409,097
Western Asset Claymore Inflation Linked Opp Fd (WIW) Cascade Investment Llc BO 82,618 $1,066,128
Valhi (VHI) Simmons Harold C CB,DIR
20,500 $987,046
Overseas Shipholding Group (OSG) Fribourg Charles DIR 54,649 $876,950
Emeritus (ESC) Baty Daniel R CB,DIR
37,500 $578,114
Ligand Pharmaceuticals (LGND) Knott David M O 24,133 $291,003
Handy & Harman (HNH) SPH Group BO 22,623 $289,265
Chemtura (CHMT) Benjamin Jeffrey D DIR 21,765 $261,180
Arch Coal (ACI) Potter Robert G DIR 15,000 $261,000
Cincinnati Financial (CINF) Woods E Anthony DIR 10,000 $258,100
Plains All American Pipeline (PAA) Allen Paul G BO 7,500,000 $444,750,016
OpenTable (OPEN) Jordan Jeffrey D DIR 100,000 $6,226,651
Intrepid Potash (IPI) Harvey Hugh E Jr DIR,BO 79,198 $2,444,842
O Reilly Automotive (ORLY) Oreilly David E CB,DIR 39,253 $2,394,779
Mercury Computer Systems (MRCY) Aslett Mark PR,CEO 23,193 $334,328
Intermec (IN) Unitrin BO 34,408 $245,962
Techprecision (TPCS) Levy Andrew A DIR,BO 150,000 $217,200
Staar Surgical (STAA) Andrews Deborah J VP,CFO 30,000 $197,561
Mercury Computer Systems (MRCY) Thibaud Didier M C VP 13,617 $195,599
New Jersey Resources (NJR) Dugan Mariellen VP,GC 4,038 $177,163

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.