MediaCom
- Website
- http://www.mediacom.com/en/home
Medialliance
- Website
- http://medialliance.ca/
Mediaplus Advertising
- Website
- http://mediaplusadvertising.com/
Mediology
- Website
- http://www.mediologymedia.com/
Meta
- Website
- http://facebook.com/
Metroland Media Group Ltd.
Microsoft Advertising
- Website
- https://www.microsoft.com/en-ca
Milestone Integrated Marketing
- Website
- https://milestoneintegrated.com/
Mindshare Canada
- Website
- http://www.mindshareworld.com/
MiQ
- Website
- http://www.wearemiq.com/
mplus
- Website
- https://mplustech.io/
Narrative PR
- Website
- https://narrative.ca