X0202 3 2004-07-28 0 0001050550 VOLTERRA SEMICONDUCTOR CORP VLTR 0001032458 KLEINER PERKINS CAUFIELD & BYERS VIII LP 2750 SAND HILL RD. MENLO PARK CA 94025 0 0 1 0 0001242719 KPCB VIII ASSOCIATES LP 2750 SAND HILL RD. MENLO PARK CA 94025 0 0 1 0 0001242721 KPCB VII ASSOCIATES LP 2750 SAND HILL RD. MENLO PARK CA 94025 0 0 1 0 0001001873 KPCB INFORMATION SCIENCES ZAIBATSU FUND II LP 2750 SAND HILL RD. MENLO PARK CA 94025 0 0 1 0 0001045113 KPCB VIII FOUNDERS FUND L P 2750 SAND HILL RD. MENLO PARK CA 94025 0 0 1 0 Series A Preferred Stock 2004-08-03 Common Stock 368665 D Series A Preferred Stock 2004-08-03 Common Stock 21335 I By KPCB VIII Founders Fund, L.P. Series A Preferred Stock 2004-08-03 Common Stock 10000 I By KPCB Information Sciences Zaibstsu Fund II, L.P. Series B Preferred Stock 2004-08-03 Common Stock 53333 I By KPCB Information Sciences Zaibstsu Fund II, L.P. Series B Preferred Stock 2004-08-03 Common Stock 113786 I By KPCB VIII Founders Fund, L.P. Series B Preferred Stock 2004-08-03 Common Stock 1966213 D Series C Preferred Stock 2004-08-03 Common Stock 637277 D Series C Preferred Stock 2004-08-03 Common Stock 36925 I By KPCB VIII Founders Fund, L.P. Series C Preferred Stock 2004-08-03 Common Stock 17287 I By KPCB Information Sciences Zaibstsu Fund II, L.P. Series D Preferred Stock 2004-08-03 Common Stock 13700 I By KPCB VIII Founders Fund, L.P. Series D Preferred Stock 2004-08-03 Common Stock 236300 D Series E Preferred Stock 2004-08-03 Common Stock 342635 D Series E Preferred Stock 2004-08-03 Common Stock 19865 I By KPCB VIII Founders Fund, L.P. The Issuer's Preferred Stock will automatically convert into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering. KPCB VIII Associates, L.P., a California limited partnership is the general partner of Kleiner Perkins Caufield & Byers VIII, L.P., a California limited partnership ("KPCB VIII") and KPCB VIII Founders Fund, L.P., a California limited partnership ("KPCB VIII FF"). KPCB VIII Associates, L.P. disclaims beneficial ownership of the shares held directly by KPCB VIII and KPCB VIII FF, except to the extent of any indirect pecuniary interest in its distributive share therein. KPCB VII Associates, L.P. is the general partner of KPCB Information Sciences Zaibatsu Fund II, L.P., a California limited partnership ("KPCB Info".) KPCB VII Associates, L.P. disclaims beneficial ownership of the shares held directly by KPCB Info, except to the extent of any indirect pecuniary interest in its distributive share therein. /s/ Susan M. Biglieri, Attorney-in-Fact 2004-07-28