X0202 3 2007-01-31 0 0001212235 XTENT INC XTNT 0001317310 ATV Associates VI, L.L.C. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001294514 Advanced Technology Ventures VI, L.P. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001294521 ATV Entrepreneurs VI, L.P. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 Series B Convertible Preferred Stock 0 Common Stock 10828 I By ATV Entrepreneurs VI, L.P. Series C Convertible Preferred Stock 0 Common Stock 9883 I By ATV Entrepreneurs VI, L.P. Series D Convertible Preferred Stock 0 Common Stock 4997 I By ATV Entrepreneurs VI, L.P. Series B Convertible Preferred Stock 0 Common Stock 169643 I By Advanced Technology Ventures VI, L.P. Series C Convertible Preferred Stock 0 Common Stock 154849 I By Advanced Technology Ventures VI, L.P. Series D Convertible Preferred Stock 0 Common Stock 78284 I By Advanced Technology Ventures VI, L.P. The reported securities are convertible at any time at the option of ATV Entrepreneurs VI, L.P., but automatically convert into shares of Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering, estimated to be on or about February 6, 2007. The reported securities are convertible at any time at the option of Advanced Technology Ventures VI, L.P., but automatically convert into shares of Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering, estimated to be on or about February 6, 2007. Not applicable. The reported securities are owned directly by ATV Entrepreneurs VI, L.P. and indirectly by ATV Associates VI, L.L.C., as general partner of ATV Entrepreneurs VI, L.P. ATV Associates VI, L.L.C. disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein. Advanced Technology Ventures VI, L.P. disclaims beneficial ownership of these securities. The reported securities are owned directly by Advanced Technology Ventures VI, L.P. and indirectly by ATV Associates VI, L.L.C., as general partner of Advanced Technology Ventures VI, L.P. ATV Associates VI, L.L.C. disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein. The Date of Event is based upon the date of effectiveness of the Issuer's Registration Statement on Form S-1 filed in connection with the Issuer's initial public offering, estimated to be on or about January 31, 2007. See Exhibit 99 - Joint Filer Information. /s/ Michael A. Carusi, Managing Director 2007-01-31