13F-HR 1 form13fhr.txt JANA PARTNERS LLC UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2006 ------------------------ Check here if Amendment [ ]; Amendment Number: ----- This Amendment (Check only one.): [ ] is a restatement. [ ] adds new holdings entries. Institutional Investment Manager Filing this Report: Name: JANA PARTNERS LLC -------------------------------------------------- Address: 200 Park Avenue, Suite 3300 -------------------------------------------------- New York, New York 10166 -------------------------------------------------- -------------------------------------------------- Form 13F File Number: 028-10328 ------------------ The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form. Person Signing this Report on Behalf of Reporting Manager: Name: Charles Penner -------------------------------------------------- Title: General Counsel -------------------------------------------------- Phone: 212 692-7696 -------------------------------------------------- Signature, Place, and Date of Signing: /s/ Charles Penner New York, New York May 12, 2006 ------------------------ ------------------------------ ------------ Report Type (Check only one.): [ X ] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) [ ] 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) [ ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).) Report Summary: Number of Other Included Managers: 0 ------------- Form 13F Information Table Entry Total: 102 ------------- Form 13F Information Table Value Total: $4,149,245 ------------- (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. NONE

------------------------------------------------------------------------------------------------------------------------------------ VOTING AUTHORITY NAME OF TITLE VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER ISSUER OF CLASS CUSIP (X $1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 3COM CORP COM 885535104 51200 10000000 SH SOLE 10000000 AGERE SYS INC COM 00845V308 81248 5402100 SH SOLE 5402100 ALTRIA GROUP INC COM 02209S103 188339 2657900 SH SOLE 2657900 AMERICA SVC GROUP INC COM 02364L109 9206 706499 SH SOLE 706499 AMERICAN EXPRESS CO COM 025816109 127991 2435600 SH SOLE 2435600 AMERICAN ORIENTIAL BIOENGR IN COM 028731107 10828 2098535 SH SOLE 2098535 ARENA RESOURCES INC COM 040049108 4909 140650 SH SOLE 140650 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