X0202 4 2007-02-06 0 0001212235 XTENT INC XTNT 0001138942 ADVANCED TECHNOLOGY VENTURES VII LP 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001317308 ATV Associates VII, L.L.C. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001294525 Advanced Technology Ventures VII(B), L.P. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001294527 Advanced Technology Ventures VII(C), L.P. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001294513 ATV Entrepreneurs VII, L.P. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 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 Common Stock 2007-02-06 4 C 0 2409589 A 2409589 I By Advanced Technology Ventures VII, L.P Common Stock 2007-02-06 4 C 0 96694 A 96694 I By Advanced Technology Ventures VII (B), L.P. Common Stock 2007-02-06 4 C 0 46477 A 46477 I By Advanced Technology Ventures VII (C), L.P. Common Stock 2007-02-06 4 C 0 14359 A 14359 I By ATV Entrepreneurs VII, L.P. Common Stock 2007-02-06 4 C 0 402776 A 402776 I By Advanced Technology Ventures VI, L.P. Common Stock 2007-02-06 4 C 0 25708 A 25708 I By ATV Entrepreneurs VI, L.P. Series B Convertible Preferred Stock 2007-02-06 4 C 0 1012820 D Common Stock 1012820 0 I By Advanced Technology Ventures VII, L.P. Series C Convertible Preferred Stock 2007-02-06 4 C 0 927748 D Common Stock 927748 0 I By Advanced Technology Ventures VII, L.P. Series D Convertible Preferred Stock 2007-02-06 4 C 0 469021 D Common Stock 469021 0 I By Advanced Technology Ventures VII, L.P. Series B Convertible Preferred Stock 2007-02-06 4 C 0 40644 D Common Stock 40644 0 I By Advanced Technology Ventures VII (B), L.P. Series C Convertible Preferred Stock 2007-02-06 4 C 0 37229 D Common Stock 37229 0 I By Advanced Technology Ventures VII (B), L.P. Series D Convertible Preferred Stock 2007-02-06 4 C 0 18821 D Common Stock 18821 0 I By Advanced Technology Ventures VII (B), L.P. Series B Convertible Preferred Stock 2007-02-06 4 C 0 19536 D Common Stock 19536 0 I By Advanced Technology Ventures VII (C), L.P. Series C Convertible Preferred Stock 2007-02-06 4 C 0 17895 D Common Stock 17895 0 I By Advanced Technology Ventures VII (C), L.P. Series D Convertible Preferred Stock 2007-02-06 4 C 0 9046 D Common Stock 9046 0 I By Advanced Technology Ventures VII (C), L.P. Series B Convertible Preferred Stock 2007-02-06 4 C 0 6036 D Common Stock 6036 0 I By ATV Entrepreneurs VII, L.P. Series C Convertible Preferred Stock 2007-02-06 4 C 0 5529 D Common Stock 5529 0 I By ATV Entrepreneurs VII, L.P. Series D Convertible Preferred Stock 2007-02-06 4 C 0 2794 D Common Stock 2794 0 I By ATV Entrepreneurs VII, L.P. Series B Convertible Preferred Stock 2007-02-06 4 C 0 169643 D Common Stock 169643 0 I By Advanced Technology Ventures VI, L.P. Series C Convertible Preferred Stock 2007-02-06 4 C 0 154849 D Common Stock 154849 0 I By Advanced Technology Ventures VI, L.P. Series D Convertible Preferred Stock 2007-02-06 4 C 0 78284 D Common Stock 78284 0 I By Advanced Technology Ventures VI, L.P. Series B Convertible Preferred Stock 2007-02-06 4 C 0 10828 D Common Stock 10828 0 I By ATV Entrepreneurs VI, L.P. Series C Convertible Preferred Stock 2007-02-06 4 C 0 9883 D Common Stock 9883 0 I By ATV Entrepreneurs VI, L.P. Series D Convertible Preferred Stock 2007-02-06 4 C 0 4997 D Common Stock 4997 0 I By ATV Entrepreneurs VI, L.P. Not applicable. The reported securities are owned directly by Advanced Technology Ventures VII, L.P. and indirectly by ATV Associates VII, L.L.C., as general partner of Advanced Technology Ventures VII, L.P. ATV Associates VII, L.L.C. disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein. Advanced Technology Ventures VII (B), L.P., Advanced Technology Ventures VII (C), L.P., ATV Entrepreneurs VII, L.P., ATV Associates VI, L.L.C., Advanced Technology Ventures VI, L.P. and ATV Entrepreneurs VI, L.P. each disclaims beneficial ownership of these securities. The reported securities are owned directly by Advanced Technology Ventures VII (B), L.P. and indirectly by ATV Associates VII, L.L.C., as general partner of Advanced Technology Ventures VII (B), L.P. ATV Associates VII, L.L.C. disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein. Advanced Technology Ventures VII, L.P., Advanced Technology Ventures VII (C), L.P., ATV Entrepreneurs VII, L.P., ATV Associates VI, L.L.C., Advanced Technology Ventures VI, L.P. and ATV Entrepreneurs VI, L.P. each disclaims beneficial ownership of these securities. The reported securities are owned directly by Advanced Technology Ventures VII (C), L.P. and indirectly by ATV Associates VII, L.L.C., as general partner of Advanced Technology Ventures VII (C), L.P. ATV Associates VII, L.L.C. disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein. Advanced Technology Ventures VII, L.P., Advanced Technology Ventures VII (B), L.P., ATV Entrepreneurs VII, L.P., ATV Associates VI, L.L.C., Advanced Technology Ventures VI, L.P. and ATV Entrepreneurs VI, L.P. each disclaims beneficial ownership of these securities. The reported securities are owned directly by ATV Entrepreneurs VII, L.P. and indirectly by ATV Associates VII, L.L.C., as general partner of ATV Entrepreneurs VII, L.P. ATV Associates VII, L.L.C. disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein. Advanced Technology Ventures VII, L.P., Advanced Technology Ventures VII (B), L.P., Advanced Technology Ventures VII (C), L.P., ATV Associates VI, L.L.C., Advanced Technology Ventures VI, L.P. and ATV Entrepreneurs VI, L.P. each 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. Advanced Technology Ventures VII, L.P., Advanced Technology Ventures VII (B), L.P., Advanced Technology Ventures VII (C), L.P., ATV Associates VII, L.L.C., ATV Entrepreneurs VII, L.P. and ATV Entrepreneurs VI, L.P. each disclaims beneficial ownership of these securities. 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 VII, L.P., Advanced Technology Ventures VII (B), L.P., Advanced Technology Ventures VII (C), L.P., ATV Associates VII, L.L.C., ATV Entrepreneurs VII, L.P. and Advanced Technology Ventures VI, L.P. each disclaims beneficial ownership of these securities. The reported securities automatically converted into shares of Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering on February 6, 2007. See Exhibit 99 - Joint Filer Information. /s/ Michael A. Carusi, Managing Director 2007-02-06