- M.V. Laemthong Pride
- Ma-ao Sugar Central Co., Inc.
- Mabuhay Vinyl Corporation
- Macht Automation
- Mactan Airport
- Mactan Power
- Madison Mackenzie & Co.
- Magellan Utilities Development Corporation
- Majestic Press, Inc.
- Makati Development Corporation
- Malabon Soap & Oil Industrial Company
- Mandaue Gas
- Mandora Marble Plaza
- Manguera Mines
- Manila Bank Building
- Manila Broadcasting Company
- Manila Eastroad Machinery Corporation
- Manila Electric Company (MERALCO)
- Manila Hotel Corporation
- Manila Mandarin Hotel, Inc.
- Manila Midtown Hotels & Land Corporation
- Manila Observatory
- Manila Paper Mills, Inc.
- Manila Pavilion Hotel
- MANSERV
- Mar Dacog
- Maranao Telephone Company
- Marblecraft, Inc.
- Marcelo Tire & Rubber Corporation
- Marcom Industries Equipment, Inc.
- Marcopper Mining Corporation
- Madison Mackenzie & Co.
- Mariano Marcos State University - ANEC
- Mariano Dacog
- Maricalum Mining Corporation
- Mariphil Marketing Corporation
- Mariwasa Manufacturing, Inc.
- Mars Industrial Corporation
- Marton Manufacturing Phils., Inc.
- Marubeni (Japan)
- Masinloc Project
- Master Wood Enterprises Corporation
- Matsushita Communication Industrial Corp. of the Phils.
- Maxco & Co.
- Mayleen Paper, Inc.
- McCann Erickson
- MDF Shipping Corporation
- Mead Johnson (Phils.), Inc.
- Mechanical Handling Engineering (Phils.) Inc.
- Meco
- Mega Plywood Corporation
- Megasco
- Megaworld Properties & Holdings, Inc.
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- Melcosa Philtrade Co., Inc.
- Meralco Foundation Institute
- Meralco Industrial Engineering Services Corp. (MIESCOR)
- Meralco Transit Organization
- Merck, Inc.
- Merex Philippines
- Metal Improvement, Inc.
- Metaphil, Inc.
- Metatronic Trading Ventures Corporation
- Metrawatt Power Corporation
- Metro Lab
- Metro Pacific Corporation
- Metro Pacific Pharma, Inc.
- Metro Transit Organization
- Metrolec Enterprises
- Metropolitan Bank & Trust Company
- Metropolitan Waterworks & Sewerage System
- MFT Enterprises
- MICASCO
- Micro D International, Inc.
- Mighty Corporation
- Milwaukee Steel Corporation
- Mindanao Portland Cement Corporation
- Mindanao Steel Corporation
- Minerals Corporatio
- Mirbon Training
- Mr. John Koloskyn
- Mirant Philippines
- Mirbon Trading
- Misamis Occidental Electric Cooperative, Inc.
- Misamis Oriental I Electric Service Cooperative, Inc.
- Misamis Oriental II Electric Cooperative, Inc.
- Mission Energy
- Mitsubishi, Heavy Industries
- Mitsui & Co. Ltd. (Japan)
- Miyasaka Polymer (Phils.)
- MM Industrial Systems & Sales
- MMSU-ANEC
- Moldex Realty, Inc.
- Monomer Sugar Central, Inc.
- Monterey Farms Corporation
- Motorola Philippines, Inc.
- Municipality of Bongao, Tawi-Tawi
- Municipality of Malitbog, Leyte
- Municipality of Panlima Sugala, Tawi-Tawi
- Municipality of Pilar, Sorsogon
- Municipality of Pilar, Pila Abra
- Municpality of San Fernando, Bukidnon
- Municipality of San Mariano, Isabela
- Municipality of San Marvin, Isabela
- Music Electronics
- Mvs Commercial
- Mwu Holdings, Ltd.
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