| MRMama Rosie's Co, Inc. | Boston, MA | Food Manufacturing311412 | 20–99 | ● ACTIVE |
Manning Way Capital Partners LLC | Bellingham, MA | Fabricated Metal Product Manufacturing332812 | — | ● ACTIVE |
Manufacturer's Rubber & Supply Co, INC. | Brentwood, NH | Plastics and Rubber Products Manufacturing326291 | — | ● ACTIVE |
Markforged INC | Waltham, MA | Machinery Manufacturing333244 | 100–499 | ● ACTIVE |
Mascon, INC. | Woburn, MA | Machinery Manufacturing333248 | — | ● ACTIVE |
Maspire INC | Brookline, MA | Printing and Related Support Activities323111 | — | ● ACTIVE |
Massachusetts Microwave CORP | Acton, MA | Computer and Electronic Product Manufacturing334220 | — | ● ACTIVE |
Mauna Kea Technologies, INC. | Allston, MA | Computer and Electronic Product Manufacturing334510 | — | ● ACTIVE |
Mayflower Communications Company, INC. | Bedford, MA | Computer and Electronic Product Manufacturing334511 | — | ● ACTIVE |
Mcgovern Mhq INC | Marlborough, MA | Transportation Equipment Manufacturing336320 | — | ● ACTIVE |
Merri Mar Yacht Basin, INC. | Newburyport, MA | Transportation Equipment Manufacturing336611 | — | ● ACTIVE |
Mersen USA Ep CORP. | Newburyport, MA | Electrical Equipment, Appliance & Component Manufacturing335999 | — | ● ACTIVE |
Metacarpal INC | Hudson, MA | Miscellaneous Manufacturing339113 | — | ● ACTIVE |
Meta Systems Group INC | Medford, MA | Miscellaneous Manufacturing339112 | — | ● ACTIVE |
| MHM & H Engineering Co., INC. | Danvers, MA | Fabricated Metal Product Manufacturing332710 | 20–99 | ● ACTIVE |
M. H. Sanborn, INC. | Andover, MA | Fabricated Metal Product Manufacturing332311 | — | ● ACTIVE |
Microwave Components, INC | Dracut, MA | Computer and Electronic Product Manufacturing334416 | — | ● ACTIVE |
| MCMiddlesex Commercial Sales, INC. | Tyngsboro, MA | Fabricated Metal Product Manufacturing332321 | — | ● ACTIVE |
Middlesex General Industries, INC | Newburyport, MA | Machinery Manufacturing333922 | — | ● ACTIVE |
Mikrolar INC | Hampton, NH | Machinery Manufacturing333998 | — | ● ACTIVE |
Mills Machine Works, INC. | Lawrence, MA | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Mir Biosciences INC. | Everett, MA | Chemical Manufacturing325413 | — | ● ACTIVE |
Mithril Technologies, INC. | Cambridge, MA | Transportation Equipment Manufacturing336419 | — | ● ACTIVE |
Mk Services CORP. | Middleton, MA | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Mks INC. | Andover, MA | Machinery Manufacturing333242 | — | ● ACTIVE |
M.m. Newman CORP | Marblehead, MA | Plastics and Rubber Products Manufacturing326199 | — | ● ACTIVE |
Mm Reif LTD | Roxbury, MA | Textile Product Mills314910 | — | ● ACTIVE |
| MIMobius Industries, INC. | Cambridge, MA | Machinery Manufacturing333998 | — | ● ACTIVE |
Morgan Scientific, INC. | Haverhill, MA | Miscellaneous Manufacturing339112 | — | ● ACTIVE |
Motion Technology, INC | Hudson, MA | Machinery Manufacturing333241 | — | ● ACTIVE |
| MSMouse Specifics INC | Framingham, MA | Computer and Electronic Product Manufacturing334510 | — | ● ACTIVE |
Mrsi Systems, LLC | Tewksbury, MA | Machinery Manufacturing333242 | — | ● ACTIVE |
Mr Solutions Americas, LLC | Acton, MA | Computer and Electronic Product Manufacturing334510 | — | ● ACTIVE |
Msi Transducers CORP. | Littleton, MA | Computer and Electronic Product Manufacturing334511 | — | ● ACTIVE |
Muka Trade LLC | Dedham, MA | Machinery Manufacturing333310 | — | ● ACTIVE |
Multisensor Scientific, INC | Cambridge, MA | Computer and Electronic Product Manufacturing334513 | — | ● ACTIVE |
Myolex, INC. | Brookline, MA | Computer and Electronic Product Manufacturing334510 | — | ● ACTIVE |
Myron J. Dickerman, INC | Sharon, MA | Miscellaneous Manufacturing339116 | — | ● ACTIVE |
Mystic Scenic Studios, INC. | Norwood, MA | Wood Product Manufacturing321999 | — | ● ACTIVE |
Naf Water Filtration LLC | Walpole, MA | Machinery Manufacturing333998 | — | ● ACTIVE |
Nano Ops INC | Needham Heights, MA | Machinery Manufacturing333242 | — | ● ACTIVE |
Nature Springs Water Company, INC. | Needham Heights, MA | Beverage and Tobacco Product Manufacturing312112 | — | ● ACTIVE |
Naushon Engineering LLC | Winchester, MA | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Nefab Packaging North East, LLC | Dover, NH | Wood Product Manufacturing321920 | — | ● ACTIVE |
Neofect Usa, INC. | Waltham, MA | Miscellaneous Manufacturing339112 | — | ● ACTIVE |
Neogenix LLC | Norwood, MA | Miscellaneous Manufacturing339112 | — | ● ACTIVE |
Netzsch Instruments North America, LLC | Burlington, MA | Computer and Electronic Product Manufacturing334516 | — | ● ACTIVE |
Neurent Medical INC | Braintree, MA | Miscellaneous Manufacturing339113 | — | ● ACTIVE |
| NINeurofieldz INC | Newton Center, MA | Computer and Electronic Product Manufacturing334510 | — | ● ACTIVE |
Neurologica CORP. | Danvers, MA | Computer and Electronic Product Manufacturing334510 | — | ● ACTIVE |