X0202 4 2008-05-05 0 0001230355 TRANS1 INC TSON 0001317308 ATV Associates VII, L.L.C. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001138942 ADVANCED TECHNOLOGY VENTURES VII LP 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 0001317307 ATV Alliance Associates, L.L.C. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 0001321046 ATV Alliance 2002, L.P. 1000 WINTER STREET, SUITE 3700 WALTHAM MA 02451 0 0 1 0 Common Stock 2008-05-05 4 S 0 96496 15.01 D 2330811 I By Fund Common Stock 2008-05-06 4 S 0 374743 14.45 D 1956068 I By Fund Common Stock 2008-05-05 4 S 0 3873 15.01 D 93534 I By Fund Common Stock 2008-05-06 4 S 0 15038 14.45 D 78496 I By Fund Common Stock 2008-05-05 4 S 0 1861 15.01 D 44959 I By Fund Common Stock 2008-05-06 4 S 0 7228 14.45 D 37731 I By Fund Common Stock 2008-05-05 4 S 0 575 15.01 D 13888 I By Fund Common Stock 2008-05-06 4 S 0 2233 14.45 D 11655 I By Fund Common Stock 2008-05-05 4 S 0 195 15.01 D 4715 I By Fund Common Stock 2008-05-06 4 S 0 758 14.45 D 3956 I By Fund The reported securities are owned directly by Advanced Technology Ventures VII, L.P. ("Ventures") and indirectly by ATV Associates VII, L.L.C. ("Associates") as general partner of Ventures. Associates and each of the other reporting persons disclaim beneficial ownership of these securities except to the extent of their respective pecuniary interest therein. The reported securities are owned directly by Advanced Technology Ventures VII (B), L.P. ("Ventures B") and indirectly by Associates as general partner of Ventures B. Associates and each of the other reporting persons disclaim beneficial ownership of these securities except to the extent of their respective pecuniary interest therein. The reported securities are owned directly by Advanced Technology Ventures VII (C), L.P. ("Ventures C")and indirectly by Associates as general partner of Ventures C. Associates and each of the other reporting persons disclaim beneficial ownership of these securities except to the extent of their respective pecuniary interest therein. The reported securities are owned directly by ATV Entrepreneurs VII, L.P. ("Entrepreneurs") and indirectly by Associates as general partner of Entrepreneurs. Associates and each of the other reporting persons disclaim beneficial ownership of these securities except to the extent of their respective pecuniary interest therein. The reported securities are owned by ATV Alliance 2002, L.P. ("Alliance 2002") and indirectly by ATV Alliance Associates, L.L.C. ("Alliance Associates") as general partner of ATV Alliance 2002. Alliance Associates, L.L.C. and each of the other reporting persons disclaim beneficial ownership of these securities except to the extent of their respective pecuniary interest therein. ATV Associates VII, LLC By /s/ Michael A. Carusi Managing Director 2008-05-07 By /s/ Michael A. Carusi, Managing Director, ATV Associates VII, LLC, its General Partner 2008-05-07 By /s/ Michael A. Carusi, Managing Director, ATV Associates VII, LLC, its General Partner 2008-05-07 By /s/ Michael A. Carusi, Managing Director, ATV Associates VII, LLC, its General Partner 2008-05-07 By /s/ Michael A. Carusi, Managing Director, ATV Associates VII, LLC, its General Partner 2008-05-07 By /s/ Jean George, Manager 2008-05-07 By /s/ Jean George, Manager, ATV Alliance Associates, LLC, its General Partner 2008-05-07