13F-HR 1 llc1q10.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: March 31, 2010 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: Terry R. Otton Chief Executive Officer (415) 591-2700 Signature, Place, and Date of Signing: /s/ Terry R. Otton San Francisco, CA April 1, 2010 Report Type: [ ] 13F HOLDINGS REPORT [ ] 13F NOTICE [X] 13F COMBINATION REPORT List of Other Managers Reporting for this Manager: 1. Guardian Investor Services LLC 2. Baillie Gifford Overseas Limited 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: 318 Form 13F Information Table Value Total: 9,554,926 List of Other Included Managers: 1. Guardian Investor Services LLC (028-02098)

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