13F-HR 1 form13fhr.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: 3/31/2011 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: Nierenberg Investment Management Company, Inc. Address: 19605 NE 8th Street Camas, WA 98607 Form 13F File Number: 028-10859 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. Persons Signing this Report on Behalf of Reporting Manager: Name: David Nierenberg Title: President Phone: 360-604-8600 Signature, Place, and Date of Signing: /s/ David Nierenberg Camas, Washington 5/13/2011 --------------------------------- --------------------------------- ---------- [Signature] [City, State] [Date] 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).) List of Other Managers Reporting for this Manager: Form 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 1 Form 13F Information Table Entry Total: 8 Form 13F Information Table Value Total: $ 340,720 -------------- (In Thousands) List of Other Included Managers: Provide a numbered list of the name(s) and 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. No. Form 13F File Number Name 1 Nierenberg Investment Management Offshore ---- -------------------- ----------------------------------------------------

FORM 13F INFORMATION TABLE COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ------------------------ -------------- --------- -------- ------------------- ---------- -------- ------------------------- VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE ------------------------ -------------- --------- -------- ---------- --- ---- ---------- -------- ---------- --------- ---- ASSET ACCEP CAP CORP Common 04543P100 26,480 4,931,049 SH DEFINED 1 4,083,208 847,841 0 ELECTRO SCIENTIFIC INDS Common 285229100 66,230 3,815,109 SH DEFINED 1 3,383,747 431,362 0 HEARTLAND PMT SYS INC Common 42235N108 45,222 2,579,667 SH DEFINED 1 2,256,246 323,421 0 MEDCATH CORP Common 58404W109 41,023 2,940,711 SH DEFINED 1 2,443,045 497,666 0 MOVE INC COM Common 62458M108 67,010 28,155,339 SH DEFINED 1 23,650,193 4,505,146 0 NATUS MEDICAL INC DEL Common 639050103 36,767 2,188,496 SH DEFINED 1 1,939,085 249,411 0 RADISYS CORP Common 750459109 39,208 4,527,463 SH DEFINED 1 3,726,287 801,176 0 ZORAN CORP Common 98975F101 18,781 1,807,604 SH DEFINED 1 1,583,170 224,434 0