13F-NT 1 f00496415.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, 2008 Check here if an Amendment [ ]; Amendment Number: _________ This Amendment (Check only one.): [ ] is a restatement. [ ] adds new holdings entries. INSTITUTIONAL INVESTMENT MANAGER FILING THIS REPORT: Name: Whitney Green River GP, LLC Address: 177 Broad Street, Suite 502 Stamford, Connecticut 06902 Form 13F File Number: 028-12716 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: Name: John M.B. O'Connor, Managing Member Phone: (212) 835-1950 Signature, Place, and Date of Signing: /s/ John M.B. O'Connor New York, New York May 9, 2008 ----------------------------------------------------------------------- [Signature] [City, State] [Date] REPORT TYPE (Check only one.): [] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) [X] 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 File No.: 028-12714 Name: J.H. Whitney Investment Management, LLC