X0201 42003-09-160 0001123313 KYPHON INC KYPH 0001188681 WEATHERMAN ELIZABETH H C/O WARBURG, PINCUS LLC 466 LEXINGTON AVENUE NEW YORK NY 10017 1000Common Stock2003-09-164X0591340.01A14149791IWarburg, Pincus Ventures, L.P.Common Stock Warrant (Right to Buy)0.012003-09-164X0591340D2002-05-222008-06-05Common Stock591580IWarburg, Pincus Ventures, L.P.The reporting person is a general partner of Warburg, Pincus & Co. and a managing director of Warburg Pincus LLC and disclaims beneficial ownership of the reported securities except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose.The listed security was acquired in connection with the 10% Convertible Promissory Notes issued to Warburg, Pincus Ventures, L.P.The warrant was exercised on a cashless basis pursuant to a net exercise provision contained in the warrant instrument.David J. Saul, Attorney-in-Fact2003-09-18