X0305 4 2012-04-03 0 0001372375 Millennial Media Inc. MM 0001545644 MacIntosh Alan C/O MILLENNIAL MEDIA, INC. 2400 BOSTON STREET, SUITE 201 BALTIMORE MD 21224 1 0 0 0 Common Stock 2012-04-03 4 C 0 243905 A 1326405 I By Acta Wireless Capital, LLC Common Stock 2012-04-03 4 S 0 132641 12.09 D 1193764 I By Acta Wireless Capital, LLC Series A-1 Convertible Preferred Stock 2012-04-03 4 C 0 243905 0.00 D Common Stock 243905 0 I By Acta Wireless Capital, LLC The total represents shares received upon conversion of shares of Series A-1 convertible preferred stock. Effective upon the closing of the issuer's initial public offering of its common stock, each share of convertible preferred stock automatically converted into one share of common stock. The convertible preferred stock had no expiration date. The shares are held directly by Acta Wireless Capital, LLC. The reporting person is a member of Acta Wireless Capital, LLC and disclaims beneficial ownership of such reported shares except to the extent of his pecuniary interest therein. /s/ Brian F. Leaf, Attorney-in-fact 2012-04-03