X0303 4 2010-08-11 0001158172 COMSCORE, INC. SCOR 0001219238 WAGNER J PETER C/O ACCEL PARTNERS 428 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 Common Stock 2010-08-11 4 J 0 1074320 0 D 3222962 I By Accel VII L.P. Common Stock 2010-08-11 4 J 0 268580 0 D 805741 I By Accel Internet Fund III L.P. Common Stock 2010-08-11 4 J 0 3581 0 A 3581 I By Accel Internet Fund III Associates L.P. Common Stock 2010-08-11 4 J 0 132814 0 D 398442 I By Accel Investors '99 L.P. Common Stock 2010-08-11 4 J 0 617 0 A 617 D Accel VII Associates L.L.C. ("A7A") is the General Partner of Accel VII L.P. ("A7") and has the sole voting and investment power. James W. Breyer, Arthur C. Patterson, Theresia Gouw Ranzetta, James R. Swartz, and J. Peter Wagner are the Managing Members of A7A and share such powers. Accel Internet Fund III Associates L.L.C. is the General Partner of Accel Internet Fund III L.P. and has the sole voting and investment power. James W. Breyer, Arthur C. Patterson, Theresia Gouw Ranzetta, James R. Swartz, and J. Peter Wagner are the Managing Members of A7A and share such powers. James W. Breyer, Arthur C. Patterson, Theresia Gouw Ranzetta, James R. Swartz, and J. Peter Wagner are the General Partners of Accel Investors '99 L.P. and therefore share the voting and investment powers. Each general partner or managing member disclaims beneficial ownership except to the extent of their pecuniary interest therein. These shares were transferred without additional consideration to partners in pro rata distributions pursuant to the partnership agreement of Accel VII L.P. These shares were transferred without additional consideration to partners in pro rata distributions pursuant to the partnership agreement of Accel Internet Fund III L.P. These shares were transferred without additional consideration to partners in pro rata distributions pursuant to the partnership agreement of Accel Investors '99 L.P. /s/ Tracy L. Sedlock, Attorney-in-Fact 2010-08-13