Names
- Marttila and Kiley2
- McCarthy, Marcus and Hennings, Ltd.2
- McKinnon, Eller and Ranne5
- McLeese5
- McMahon, Squier and Associates1
- McNally, Temple Associates, Inc.1
- McNally, Temple and Associates1
- Media Strategies and Research17
- Media Works1
- MediaPartners1
- Metro Production1
- Michael Carrier Enterprises1
- Michael Ellis2
- Michael Getto Productions1
- Michael Oransky3
- Michael Williams Enterprises15
- Mike Murphy Media, Inc.2
- Modern Videofilm1
- Morris and Carrick1
- Morris and Carrick, Inc.27
