13F-HR 1 llc3q06.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: September 30, 2006 Amendment [ ]; Amendment Number: This Amendment: [ ] is a restatement. [ ] adds new holdings entries. Institutional Investment Manager Filing this Report: RS Investment Management Co. LLC 388 Market Street, Ste. 1700 San Francisco, CA 94111 13F File Number: 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: Terry R. Otton Chief Executive Officer (415) 591-2700 Signature, Place, and Date of Signing: /s/ Terry R. Otton San Francisco, CA November 10, 2006 Report Type: [X] 13F HOLDINGS REPORT [ ] 13F NOTICE [ ] 13F COMBINATION REPORT List of Other Managers Reporting for this Manager: NONE I AM SIGNING THIS REPORT AS REQUIRED BY THE SECURITIES AND EXCHANGE ACT OF 1934. FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: None Form 13F Information Table Entry Total: 477 Form 13F Information Table Value Total: 8,324,184 List of Other Included Managers: None

ISSUER TYPE CUSIP VALUE SHS INVEST VOTG (X1000) DISCRET AUTH Aaron Rents, Inc. Com 002535201 64,305 2,798,300 sole sole ABB Ltd., ADR SP ADR 000375204 2,839 215,400 sole sole Abercrombie & Fitch Co Cl A 002896207 7,226 104,000 sole sole Activision, Inc. Com 004930202 5,481 363,000 sole sole Adobe Systems, Inc. Com 00724f101 3,340 89,190 sole sole Advance America Cash A Com 00739w107 159 11,060 sole sole Advanced Magnetics, In Com 00753p103 68 2,000 sole sole Advanced Micro Devices Com 007903107 1,864 75,000 sole sole Advent Software, Inc. Com 007974108 4,384 121,071 sole sole Affiliated Managers Gr Com 008252108 73,726 736,450 sole sole Agere Systems, Inc. Com 00845v308 1,941 130,000 sole sole Akamai Technologies, I Com 00971T101 21,504 430,160 sole sole Alaska Air Group, Inc. Com 011659109 2,088 54,900 sole sole Alcan, Inc. Com 013716105 34,300 860,300 sole sole Alexander & Baldwin, I Com 014482103 73,686 1,660,706 sole sole Allegheny Technologies Com 01741r102 168,248 2,705,390 sole sole Allergan, Inc. Com 018490102 3,266 29,000 sole sole Alliance Data Systems Com 018581108 7,274 131,800 sole sole Alliant Techsystems, I Com 018804104 4,296 53,000 sole sole Allis-Chalmers Energy Com 019645506 4,402 300,680 sole sole Allscripts Healthcare Com 01988P108 17,084 760,990 sole sole Altiris, Inc. Com 02148M100 11,498 545,168 sole sole Altria Group, Inc. Com 02209s103 2,725 35,600 sole sole Ambac Financial Group, Com 023139108 58,549 707,540 sole sole Amdocs Ltd. ORD G02602103 3,152 79,600 sole sole America Movil S.A. de SP ADR L SHS02364w105 2,244 57,000 sole sole American Commercial Li Com 025195207 7,218 121,420 sole sole American Eagle Outfitt Com 02553e106 2,411 55,000 sole sole American Express Co. Com 025816109 2,524 45,000 sole sole American Medical Syste Com 02744m108 14,028 761,170 sole sole American Railcar Indus Com 02916p103 10,578 363,383 sole sole AmericanWest Bancorp. Com 03058p109 3,506 165,000 sole sole Ameriprise Financial, Com 03076c106 48,154 1,026,730 sole sole Amerisafe, Inc. Com 03071h100 14,015 1,430,140 sole sole AMN Healthcare Service Com 001744101 23,423 986,216 sole sole Amvescap PLC, ADR SP ADR 03235e100 67,481 3,078,500 sole sole Amylin Pharmaceuticals Com 032346108 2,574 58,400 sole sole Anadarko Petroleum Cor Com 032511107 54,915 1,252,900 sole sole Anaren, Inc. Com 032744104 84 4,000 sole sole AngioDynamics, Inc. Com 03475v101 15,070 727,651 sole sole Ansoft Corporation Com 036384105 57 2,300 sole sole Apple Computer, Inc. Com 037833100 9,941 129,060 sole sole Applied Micro Circuits Com 03822w109 5,094 1,762,540 sole sole aQuantive, Inc. Com 03839g105 21,135 894,789 sole sole Arch Coal, Inc. 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