13F-HR 1 llc4q12.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: December 31, 2012 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: 028-12027 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: Matthew H. Scanlan Chief Executive Officer (415) 591-2700 Signature, Place, and Date of Signing: /s/ Matthew H. Scanlan San Francisco, CA January 31, 2013 Report Type: [ ] 13F HOLDINGS REPORT [ ] 13F NOTICE [X] 13F COMBINATION REPORT List of Other Managers Reporting for this Manager: 028-02098 Guardian Investor Services LLC 028-04395 Baillie Gifford Overseas Limited 028-10498 First Mercantile Trust Company 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: 1 Form 13F Information Table Entry Total: 284 Form 13F Information Table Value Total: 11,906,900 List of Other Included Managers: 1. Guardian Investor Services LLC (028-02098)

Voting Authority ------------------------- Value Shares/ Sh/ Put/Invstmt Other Name of Issuer Title of clas CUSIP (x$1000) Prn Amt Prn CallDscretn Managers Sole Shared None ------------------------------ ---------------------- -------- -------------- ----------- --------- -------- -------------- Acadia Healthcare Co., Inc. COM 00404A109 12,609 540,460 SH Defined 1 506,860 33,600 Activision Blizzard, Inc. COM 00507V109 116,177 10,994,976 SH Defined 1 10,614,576 380,400 Acxiom Corp. COM 005125109 109,078 6,247,312 SH Defined 1 6,153,582 93,730 Aegerion Pharmaceuticals, Inc. COM 00767E102 7,943 312,850 SH Defined 1 293,275 19,575 Affiliated Managers Group, Inc. COM 008252108 5,733 44,050 SH Defined 1 44,050 0 Aflac, Inc. COM 001055102 37,152 699,394 SH Defined 1 699,394 0 Airgas, Inc. COM 009363102 22,848 250,278 SH Defined 1 236,794 13,484 Alexion Pharmaceuticals, Inc. COM 015351109 2,951 31,460 SH Defined 1 31,460 0 Align Technology, Inc. COM 016255101 13,935 502,171 SH Defined 1 479,667 22,504 Alliance Data Systems Corp. COM 018581108 3,212 22,190 SH Defined 1 22,190 0 Allscripts Healthcare Solutions, COM 01988P108 16,693 1,772,112 SH Defined 1 1,745,912 26,200 Altra Holdings, Inc. COM 02208R106 7,330 332,435 SH Defined 1 311,735 20,700 Amazon.com, Inc. COM 023135106 8,122 32,340 SH Defined 1 32,340 0 Ameriprise Financial, Inc. COM 03076c106 40,620 656,358 SH Defined 1 616,005 40,353 AMETEK, Inc. COM 031100100 5,739 152,762 SH Defined 1 152,762 0 Amgen, Inc. COM 031162100 4,635 53,700 SH Defined 1 53,700 0 Amicus Therapeutics, Inc. COM 03152W109 5,499 2,051,727 SH Defined 1 1,923,307 128,420 AmTrust Financial Services, Inc. COM 032359309 47,207 1,645,411 SH Defined 1 1,440,956 204,455 Anheuser-Busch InBev N.V., ADR ADR 03524a108 170 1,940 SH Defined 1 1,940 0 AOL, Inc. COM 00184X105 82,489 2,795,521 SH Defined 1 2,744,665 50,856 Apple, Inc. COM 037833100 22,378 41,983 SH Defined 1 41,983 0 Ariad Pharmaceuticals, Inc. COM 04033A100 7,459 388,910 SH Defined 1 364,710 24,200 Aruba Networks, Inc. COM 043176106 36,353 1,751,970 SH Defined 1 1,684,310 67,660 Aspen Technology, Inc. COM 045327103 31,227 1,129,780 SH Defined 1 1,082,508 47,272 Associated Banc-Corp. COM 045487105 69,252 5,278,320 SH Defined 1 5,199,908 78,412 Atwood Oceanics, Inc. COM 050095108 20,841 455,150 SH Defined 1 436,050 19,100 Autodesk, Inc. COM 052769106 4,519 127,850 SH Defined 1 127,850 0 Avago Technologies Ltd. SHS Y0486S104 6,009 189,800 SH Defined 1 189,800 0 Avery Dennison Corp. COM 053611109 94,612 2,709,389 SH Defined 1 2,668,880 40,509 Beacon Roofing Supply, Inc. COM 073685109 34,569 1,038,730 SH Defined 1 931,260 107,470 Berkshire Hathaway, Inc., Class ACL A 084670108 3,352 25 SH Defined 1 25 0 Berkshire Hathaway, Inc., Class BCL B 084670702 237 2,647 SH Defined 1 2,647 0 Biogen Idec, Inc. COM 09062x103 4,592 31,310 SH Defined 1 31,310 0 BioMarin Pharmaceutical, Inc. 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COM 366651107 13,961 303,370 SH Defined 1 291,279 12,091 Geospace Technologies Corp. COM 37364X109 24,244 272,800 SH Defined 1 241,442 31,358 Gilead Sciences, Inc. COM 375558103 12,112 164,900 SH Defined 1 164,900 0 Global Payments, Inc. COM 37940X102 38,131 841,741 SH Defined 1 796,141 45,600 Globus Medical, Inc., Class A CL A 379577208 12,124 1,155,790 SH Defined 1 1,016,910 138,880 GNC Holdings, Inc., Class A CL A 36191G107 2,499 75,100 SH Defined 1 75,100 0 Goldcorp, Inc. COM 380956409 169,345 4,614,309 SH Defined 1 4,502,941 111,368 Google, Inc., Class A CL A 38259p508 14,971 21,105 SH Defined 1 21,105 0 Graco, Inc. COM 384109104 18,184 353,160 SH Defined 1 338,311 14,849 Grand Canyon Education, Inc. COM 38526M106 31,536 1,343,680 SH Defined 1 1,178,970 164,710 H&R Block, Inc. COM 093671105 9,212 496,080 SH Defined 1 469,380 26,700 Hanesbrands, Inc. 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