13F-HR 1 cwam13fhr.txt COLUMBIA WANGER ASSET MANAGEMENT 13F-HR UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 13F Form 13F Cover Page Report for the Quarter Ended December 31, 2007 Check here if Amendment [ ] This Amendment (check only one) [ ] is a restatement [ ] adds new holdings Institutional Investment Manager Filing this Report: Columbia Wanger Asset Management, L.P. 227 West Monroe Street Suite 3000 Chicago, IL 60606 Form 13F File Number: 028-03639 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: Bruce H. Lauer Senior Vice President 312-634-9230 Signature, Place, and Date of Signing: /s/ Bruce H. Lauer Chicago, IL February 1, 2008 Report Type: [X] 13F HOLDINGS REPORT [ ] 13F NOTICE [ ] 13F COMBINATION REPORT List of Other Managers Reporting for this Manager: None 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 Form 13F Information Table Entry Total: 348 Form 13F Information Table Value Total: 25,164,768,000 VALUE SHARES/ SH/ PUT/ INVSTMT OTHER VOTING AUTHORITY NAME OF ISSUER ISSUE CLASS CUSIP (X1000) PRN AMT PRN CALL DSCRETN MANAGERS SOLE SHARED NONE ------------------------------ ------------ --------- -------- --------- --- ---- ------- ------------ --------- --------- --------- AFC ENTERPRISES INC COM 00104Q107 21712 1918000 SH SOLE 1800000 0 118000 AARON RENTS INC COM 002535201 10736 558000 SH SOLE 558000 0 0 ABERCROMBIE & FITCH CO CL A 002896207 495974 6202000 SH SOLE 5940000 0 262000 ACTIVISION INC NEW COM NEW 004930202 22275 750000 SH SOLE 750000 0 0 ACTUATE CORP COM 00508B102 38850 5000000 SH SOLE 5000000 0 0 ACUITY BRANDS INC COM 00508Y102 40730 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