M
- Maroc Soir
- Marvel Comics
- Mas Por Mas
- Mascular Living
- MaskonTravel Company
- Massachusetts Nurse Associate
- Massis Weekly
- Massive Bio, Inc.
- Master Magazine
- Master's Meeting
- Mathrubhumi Daily
- Matt Productions Co. Ltd
- Maui News
- Maven Coalition, Inc
- Maxim Inc.
- MAXIM Mexico
- MaximumYield Inc.
- Mayan Magazine
- MAYEB Basin Yayin Insan Kaynaklari Ltd. Sti
- MC Ediciones
- McClatchy Newspaper
- MCF SAS
- Mcfill Media & Publishing Group FZE LLC
- MCG Italia
- McGuire Publishing Inc.
- McHugh Media
- McPherson Media
- MDE
- Media 24
- Media 24 Magazines
- Media Business Generators
- Media Contenidos
- Media Do International
- Media Financial Management Association, Inc.
- Media Group Pte Ltd
- Media Jovem, LDA
- Media Marco C
- Media Nova
- Media Services
- Media Task Consult
- Media Transasia Thailand Ltd.
- Media Trust Limited
- Media with Passion
- Media Works
- Media9ParSA
- Mediacity Kft.
- MediaCo LLC
- Mediafax Group SA
- Mediahuis
- Mediahuis Ireland