- Lippincott Williams & Wilkins
- Lonely Planet
- Long Thread Media LLC
- Louise Blouin Media
- Lumina Media
- Macfadden Communications Group
- Madavor Media Llc
- Maher Publ
- Making Music Magazine
- Mansueto Ventures LLC
- Maplegate Media Publishing
- Martha Stewart Living
- Marvel Entertainment Group Inc
- Maven
- MC Aby Publishing
- Media DC
- Media Out Loud, LLC
- Media360LLC
- Mental Floss Llc
- Meredith Corporation
- Metrocorp, Inc
- Midwest Outdoors
- Miller Sports Group
- Milwaukee Magazine Inc/Mcgeary
- MissouriLife
- MIT
- Modern Farmer Media
- Moffly Publications, Inc.
- Morris Media Network
- Morris Publishing Group
- Morris Visitor Publications
- Mother Jones
- Motor Trend Group
- Motorsports Marketing
- MovieMaker Magazine
- Murphos Publishing
- Music Maker Publications, Inc.
- National Audubon Society
- National Geographic Society
- National Review
- National Wildlife Federation
- Native Peoples
- Natural History Magazine Inc
- Navigator Publishing LLC
- Network Journal
- Nevada Magazine
- New Bay Media, Llc
- New England Home
- New Hope Communications Llc
- New Jersey Monthly
- New Mexico Magazine
- New York Magazine
- NewsMax Media
- Newsweek, Inc
- North American Membership Group, Inc.
- Northwest Fly Fishing, LLC
- Northwoods Sporting Journal
- NPS Media Group
- Nylon Media, Inc.
- Ogden Publications, Inc.
- O'Meara Brown Publications, Inc.
- On Tap Publishing LLC
- Opera News
- Organic Spa Magazine, Ltd.
- Outdoor Sportsman Group
- Outside Magazine
- Overseas Ministry Study Center
- Owl Media LLC
- Pacific Standard
- Paisano Publications, LLC.
- Paper Publishing Co.
- Penny Press
- Penske Media
- Penske Media Company
- Penthouse Global Media
- Plan Multimedia LLC
- Pocket Outdoor Media, LLC
- Poets & Writers, Inc.