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 Tuesday, Jan. 24, 2012 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.

Icahn Enterprises LP (IEP) Icahn Carl C CB,PT
12,583,829 $463,000,608
Kronos Worldwide (KRO) Simmons Harold C CB,DIR
81,000 $1,704,489
Geoeye (GEOY) Feinberg Stephen BO 50,000 $1,096,905
Spectrum Brands Holdings (SPB) Harbinger Group BO 37,100 $1,087,388
Blackrock Utility & Infrastructure Trust (BUI) Anderson Kathleen M O 10,000 $202,663
Spark Networks (LOV) Osmium Partners Llc BO 54,000 $198,240
Chelsea Therapeutics (CHTP) Austin Josiah T BO 40,000 $192,000
Moduslink Global Solutions (MLNK) Handy & Harman BO 16,052 $89,829
First Opportunity Fund (FOFI) Mildred B Horejsi Trust BO 7,600 $49,120
Unilife (UNIS) Shortall Alan CEO,DIR 10,000 $40,276
Autozone (AZO) Lampert Edward S BO 300,024 $104,120,328
Exco Resources (XCO) Miller Douglas H CB,CEO
1,186,681 $9,316,751
Consolidated Edison (ED) McGrath Eugene R DIR 100,000 $5,839,000
Rockwell Collins (COL) Statler Kent L VP,COO 46,310 $2,755,006
Stamps.Com (STMP) Miller Lloyd I III DIR 85,423 $2,688,868
Clarcor (CLC) Johnson Norman E CB,DIR 51,335 $2,679,687
IBM (IBM) Loughridge Mark VP,CFO 11,163 $2,106,425
Fleetcor Technologies (FLT) Clarke Ronald CEO,PR
58,798 $1,967,208
Synnex (SNX) Silver Star Developments BO 34,899 $1,244,035
Photronics (PLAB) Macricostas Constantine S CEO,PR
150,000 $1,064,305

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.