Products
- Mathews-Davis Railway Motor Co.
- Mathieson Alkali Works
- Matlack Systems, Inc.
- Matson Navigation Company
- Matson Navigation Company (Signed by William Matson)
- Matteawan Manufacturing Company
- Mattel, Inc.
- Mattel, Inc.
- Mattel, Inc.
- Mauna Loa Macadamia Partners, L.P.
- Max-Delta Gold Mining Company
- Maxim Munitions Corporation
- May Department Stores Company
- Mayflower Hotel Company (Washington, DC)
- Maysville & Lexington Rail Road Co.
- McCrory Corporation
- McDonald's Corporation
- McDonald's Corporation
- McGraw-Hill, Inc.
- MCI Communications Corporation
- MCI Communications Corporation
- McKesson & Robbins, Inc.
- Mead Johnson & Company
- Meade Baking Company
- Meadow Brook National Bank of Nassau County
- Medcom, Inc.
- Medford Woolen Manufacturing Company
- Medical Dispensing Systems, Inc. N.E. (Penny Stock Scheme)
- Medical Economics, Inc.
- Medical Enterprises, Inc.
- Medical Health Industries, Inc.
- MEI Corporation
- Mellon National Corporation
- Melpar, Inc.
- Memphis and Little Rock Railway Company
- Memphis City Rail Road Company
- Memphis City Railroad Company
- Mercantile Library Company of Philadelphia
- Merchants Exchange of St. Louis
- Mercury Machine Company
- Meredith Corporation (Better Homes & Gardens)
- Meredith Publishing Company (Better Homes & Gardens)
- Mergenthaler Linotype Company (Signed by Darius Ogden Mills)
- Meriden and Cromwell Rail Road Company (Connecticut)
- Merrill Lynch & Co., Inc.
- Merrill Lynch, Pierce, Fenner & Smith Incorporated
- Mesaba Railway Company
- Metropolitan 5 to 50 Cent Stores, Inc.
- Metropolitan Associates of New York
- Metropolitan Cross-Town Railway Company (Signed by Peter AB Widener)
- Metropolitan-Cobalt Mining Company
- Mexican Telephone Company
- Mexico North Western Railway Company
- Meyer-Blanke Company
- Miami Consolidated Mines Company
- Michigan Central Rail Road Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Central Railroad Company
- Michigan Gas & Oil Corporation
- Michigan Radio Corporation
- Michigan Radio Corporation
- Michigan Southern & Northern Indiana Rail Road Company
- Michigan Southern and Northern Indiana Rail-Road Company
- Michigan Southern and Northern Indiana Rail-Road Company
- Michigan Southern and Northern Indiana Rail-Road Company
- Michigan Southern and Northern Indiana Rail-Road Company
- Michigan Southern and Northern Indiana Rail-Road Company
- Michigan Southern and Northern Indiana Railroad Company
- Michigan Wisconsin Pipe Line Company
- Michigan-Colorado Copper Company
- Mid-Continent Manufacturing Co.
- Middle Fork Mining Company
- Middle States Coal and Iron Mines Company
- Middle West Utilities Company
- Middle West Utilities Company
- Middle West Utilities Company
- Middleborough and Taunton Railroad Corporation
- Middlesex and Somerset Traction Company
- Middlesex Railroad Company
- Middlesex Railroad Company
- Middletown & Crawford Railroad Company
- Middletown and Elizabethtown Street Railway Company
- Middletown Street Railway Company
- Midget Gold Mining Company
- Midland Precinct, Nebraska (Omaha & Republican Valley Railroad)
- Midwest Athletic Club (Chicago)
- Miehle-Goss-Dexter, Incorporated
- Mifflin and Centre County Rail Road Company
- Mifflin and Centre County Rail Road Company
- Milford and Matamoras Railroad Company
- Mill Creek and Mine Hill Navigation and Railroad Company
- Miller Gold Mining Company