- M-Tech Diagnostics Ltd.
- Magellan Biosciences
- MART Microbiology BV
- Mast Group Ltd
- Medical Engineering Technologies
- Medical Wire & Equipment Co
- MediSolution
- Medline Scientific
- MedMira Inc.,
- Membrane Solutions, LLC
- Merck Millipore
- Meridian Bioscience, Inc.
- Meridian Life Science, Inc
- Merlin Diagnostika GmbH
- Mettler-Toledo, Inc.
- Michael Smith Engineers Ltd
- Micro Identification Technologies
- Microbiologics, Inc.
- Microbiology International
- Microgen Bioproducts Ltd.
- Micrology Laboratories L.L.C.
- Micronic BV
- Microphage, Inc.
- MicroVal secretariat
- MIDI, Inc
- Millipore Corp
- Minerva Biolabs GmbH
- Misys Healthcare Systems
- MO BIO Laboratories
- Mobidiag Oy
- MOCON Inc.
- MODA Technology Partners
- Molecular Detection Inc.
- Molzym GmbH & Co.KG
- Mossman Associates Inc.
- Motic Instruments Inc.
- Mountain States Consulting, LLC
- Myconostica Ltd