- (Melec) Shanghai Jiameng Electrical Equipment Co.,Ltd
- Mabey Bridge & Shore, Inc.
- MacLean Power Systems
- MADI, LLC
- Magnekon S.A. de C. V.
- Mahabir Industries & Allied Works Pvt. Ltd
- Manitoba HVDC Research Centre
- Manitoba Hydro High Voltage Test Facility
- Manta Test Systems Inc.
- Marmon Utility LLC - Hendrix
- MarTek Limited
- Marwell Corporation
- Mastec North America, Inc.
- Matco Services Inc.
- Matrix Service Industrial Contractors, Inc.
- Maxwell Technologies SA
- Maysteel, LLC
- McFarland Cascade Holdings
- McKim & Creed, Inc.
- McKinney Drilling Company
- McWane Poles
- Megger
- Mehta Tech, Inc.
- Meramec Electrical Products Co., Inc.
- Merrick & Company
- Mesa Associates Inc.
- Mesa Technical Associates Inc
- Messko, a division of REINHAUSEN
- Metal Foundations Industries
- MetPlas Inc.
- Michels Corporation
- Midland Bolt
- Midsun Group Inc
- Midtronics, Inc.
- Milbank Manufacturing
- Milsoft Utility Solutions
- Mining Controls Inc.
- Mitas Towers
- Mitsubishi Electric Power Products, Inc.
- MJ Electric, a division of Quanta Services

- Modular Connections, LLC
- Moloney Electric Inc.
- Morgan Schaffer
- Mosdorfer NA
- Mosebach Manufacturing Company
- Movex Innovation
- MP Husky
- Multi-Contact USA
- MVA Power Inc.
- MWH Global
- Myers Power Products, Inc.
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