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, April 04, 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.

Enphase Energy (ENPH) Madrone Partners BO 2,291,667 $13,750,002
Enphase Energy (ENPH) KPCB Green Growth Fund BO 728,215 $4,369,290
Cracker Barrel Old Country Store (CBRL) Biglari Sardar BO 50,100 $2,818,519
HCA Holdings (HCA) Bank Of Americae BO 57,500 $1,478,256
Sunrise Senior Living (SRZ) Carlson Capital BO 220,964 $1,399,575
Endeavour International Corp (END) GMT Capital BO 106,514 $1,291,528
Great Wolf Resorts (WOLF) HG Vora Capital BO 125,000 $705,000
Vocera Communications (VCRA) Zerella William CFO 30,000 $480,000
Opko Health (OPK) Frost Phillip Md Et Al CEO,CB
80,000 $384,838
Regional Management (RM) Demolina Alvaro G DIR 20,000 $350,000
Dollar General (DG) Buck Holdings BO 56,301,768 $2,477,593,088
Zynga (ZNGA) Pincus Mark J CEO,DIR
16,500,000 $192,060,000
Google (GOOG) Brin Sergey F,DIR
83,334 $53,613,384
Tangoe (TNGO) Edison Partners BO 2,989,822 $52,269,564
Amarin Corp (AMRN) Healy James DIR 2,000,000 $21,964,950
Tangoe (TNGO) Kimzey Jackie R DIR 1,128,288 $19,722,474
Zynga (ZNGA) Hoffman Reid DIR 1,375,252 $16,007,933
Tangoe (TNGO) Coit David M DIR 903,286 $15,791,697
Zynga (ZNGA) Lee Cadir B VP,CTO 1,171,664 $13,638,169
Kaiser Aluminum (KALU) Veba For Retirees Of Kaiser Aluminum BO 242,800 $11,732,568

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.