X0306 4 2012-09-11 0 0001372375 Millennial Media Inc. MM 0001545621 Brandenburg John Christopher C/O MILLENNIAL MEDIA, INC. 2400 BOSTON STREET, SUITE 201 BALTIMORE MD 21224 0 1 0 0 EVP, Chief Technology Officer Common Stock 2012-09-11 4 A 0 40000 0.00 A 4830447 D Common Stock 650000 I By GRAT This security represents restricted stock units granted to the reporting person. Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer. The shares underlying these restricted stock units vest over a period of four years, in equal quarterly installments beginning on November 15, 2012, subject to the reporting person's continuous service with the issuer as of the applicable vesting date, and subject to accelerated vesting in specified circumstances. The shares are held by The John Christopher Brandenburg 2010 Grantor Retained Annuity Trust, of which the reporting person is the trustee. /s/ Brian F. Leaf, Attorney-in-fact 2012-09-13