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 Thursday, April 28, 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.

Red Lion Hotels (RLH) Columbia Pacific Opp Fund BO 13,710 $114,183
First Horizon National (FHN) Jordan D Bryan PR,CEO
DIR
10,000 $107,600
Chubb (CB) Kellner Lawrence W DIR 1,000 $64,339
Culp (CFI) Asen R Scott BO 6,608 $59,821
Pier 1 Imports (PIR) Babrowski Claire H DIR 4,000 $49,206
Valhi (VHI) Simmons Harold C CB,DIR
BO
1,409 $44,243
Baylake (BYLK) Stackhouse Elyse Mollner DIR 6,790 $30,140
Peoples Financial Svs (PFIS) Wootton Earle A DIR 1,095 $28,032
First Opportunity Fund (FOFI) Mildred B Horejsi Trust BO 2,120 $15,646
United Security Bancshares (UBFO) Woolf Michael T DIR 3,000 $10,912
Source: www.InsiderInsights.com
Travelzoo (TZOO) Azzurro Capital DIR,BO 320,000 $29,398,400
Kaiser Aluminum Corp (KALU) Retirees Of Kaiser Aluminum BO 265,038 $13,176,093
Kellogg Co (K) Kellogg WK Foundation BO 178,300 $9,990,327
Intralinks Holdings (IL) TA Associates DIR,BO 330,000 $9,710,437
Valmont Industries (VMI) Robert B Daugherty Charitable Fdn BO 92,000 $9,655,727
Discovery Communications (DISCA) Malone John C DIR,BO 215,861 $9,009,679
Abbott Laboratories (ABT) White Miles D CB,CEO
DIR
115,160 $5,891,820
Complete Production Svs (CPX) Hamm Harold DIR 156,584 $5,246,347
Metropcs Communications Inc (PCS) TA Associates DIR 300,000 $5,046,870
Apollo Group (APOL) Sperling John G CB,DIR
BO
110,000 $4,421,318
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.