Politics and Business magazines
- Mac-Gray Corporation
- MacDermid Incorporated
- Mace Security International, Inc.
- MacGregor Golf Company
- Mack-Cali Realty Corporation
- Mackay Envelope Corporation
- Mackie Designs Inc.
- Maclean Hunter Limited
- Maclean Hunter Publishing Limited
- MacMillan Bloedel Limited
- Macmillan, Inc.
- MacNeil/Lehrer Productions
- Macquarie Bank Ltd.
- Macromedia, Inc.
- Madden’s on Gull Lake
- Madeco S.A.
- Madeira Wine Company, S.A.
- Madge Networks N.V.
- Madison Gas and Electric Company
- Madison-Kipp Corporation