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 open-market insider purchases and sales filed at the Securities and Exchange Commission Monday, May 23, 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.

Barnes & Noble (BKS) Burkle Ronald W BO 603,000 $11,148,867
Swisher Hygiene (SWSH) Hudson Harris W DIR 503,130 $3,031,140
China Biotics (CHBT) Value Holdings Capital BO 100,000 $1,049,145
Valhi (VHI) Simmons Harold C CB,DIR
10,000 $395,000
Huntington Bancshares (HBAN) Steinour Stephen D PR,CEO
39,000 $248,414
Valuevision Media (VVTV) Stewart Keith R CEO,DIR 37,000 $231,990
Lyondellbasell Industries (LYB) Smith Bruce A DIR 5,000 $201,750
M & T Bank (MTB) Buckley Michael D DIR 2,000 $178,859
Primus Telecommunications (PMUG) Singer Karen BO 12,500 $175,000
Overstock.Com (OSTK) Chou Francis S M BO 12,200 $167,140
Validus Holdings (VR) Singh Alok DIR 479,689 $15,629,947
Clearwire (CLWR) Intel Corp BO 2,040,000 $9,231,800
Hologic (HOLX) Stein Jay A CTO 200,000 $4,152,000
Broadsoft (BSFT) Goodman Robert P DIR 100,000 $4,071,553
Acme Packet (APKT) Ory Andrew D PR,CEO
50,000 $3,871,541
Petrohawk Energy (HK) Wilson Floyd C CB,CEO
141,400 $3,561,513
Carbo Ceramics (CRR) Morris William C DIR,BO 17,500 $2,662,929
Netsuite (N) Farrington Deborah A DIR 46,400 $1,673,047
Qlik Technologies (QLIK) Ott Alexander DIR 50,000 $1,587,040
Fresh Del Monte Produce (FDP) Abu Ghazaleh Amir DIR 46,168 $1,254,846

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.