| LSLowell Sewing INC | Lowell | MA | Apparel Manufacturing315250 | — | ◐ LIKELY ACTIVE |
| LILundey, INC. | Attleboro | MA | Computer and Electronic Product Manufacturing334416 | 1-19 | ◐ LIKELY ACTIVE |
| LILutco INC | Worcester | MA | Fabricated Metal Product Manufacturing332991 | 20-99 | ◐ LIKELY ACTIVE |
| MAMa53 Ametek Aerospace Products | Wilmington | MA | Chemical Manufacturing325992 | 20-99 | ◐ LIKELY ACTIVE |
| MEMagnetika East Limited Partnership | Marlborough | MA | Computer and Electronic Product Manufacturing334416 | 1-19 | ◐ LIKELY ACTIVE |
| MTMajor Theatre Equipment CORP | North Quincy | MA | Textile Product Mills314120 | 1-19 | ◐ LIKELY ACTIVE |
| MRMarble Ridge Winery | North Andover | MA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MMMarposa Manufacturing | Waltham | MA | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| MMMarzetti Manufacturing Company-Chatham Village | Wareham | MA | Food Manufacturing311812 | 100-499 | ◐ LIKELY ACTIVE |
| MBMassachusetts Broken Stone Company | Berlin | MA | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| MIMay Institute | Randolph | MA | Computer and Electronic Product Manufacturing334412 | — | ◐ LIKELY ACTIVE |
| MIMbmmfg, INC | Easthampton | MA | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| MIMbw, INC. | Orange | MA | Paper Manufacturing322291 | 100-499 | ◐ LIKELY ACTIVE |
| MIMicrofab INC | Amesbury | MA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| MIMicrogroup INC | Medway | MA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MCMicrosemi CORP - Massachusetts | Lowell | MA | Computer and Electronic Product Manufacturing334412 | — | ◐ LIKELY ACTIVE |
| MKMiles Kedex CO INC | Westminster | MA | Paper Manufacturing322299 | 20-99 | ◐ LIKELY ACTIVE |
| MWMillimeter Wave Systems LLC | Amherst | MA | Computer and Electronic Product Manufacturing334419 | 1-19 | ◐ LIKELY ACTIVE |
| MMMjm Manufacturing Solutions, INC. | Swansea | MA | Fabricated Metal Product Manufacturing332710 | 1-19 | ◐ LIKELY ACTIVE |
| MPModern Pastry, Inc. | Boston | MA | Food Manufacturing311812 | 20-99 | ◐ LIKELY ACTIVE |
| MMMontague Machine CO | Montague (turners Falls) | MA | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MSMontrose School Campus Improvement Project | Medfield | MA | Computer and Electronic Product Manufacturing334510 | — | ◐ LIKELY ACTIVE |
| MSM Susi Hma LLC | Boston, City of | MA | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| MDMurr-ma Distilling Company, LLC. | Easthampton | MA | Beverage and Tobacco Product Manufacturing312140 | 1-19 | ◐ LIKELY ACTIVE |
| MBMutual Beef Co., Inc. | Boston | MA | Food Manufacturing311612 | 1-19 | ◐ LIKELY ACTIVE |
| NDNamu Distilling Company LLC | Boston | MA | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| NRNationwide Rock & Recycling | Ashland | MA | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| NINetbio INC | Waltham | MA | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| NBNew Balance Athletics INC | Lawrence | MA | Leather and Allied Product Manufacturing316210 | — | ◐ LIKELY ACTIVE |
| NENew England Tele | Springfield | MA | Miscellaneous Manufacturing339999 | — | ◐ LIKELY ACTIVE |
| NENew England Waste Disposal | Taunton | MA | Wood Product Manufacturing321999 | — | ◐ LIKELY ACTIVE |
| NPNortheast Paving Granby Plant | Granby | MA | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| NMNova Medical INC | Wilmington | MA | Computer and Electronic Product Manufacturing334510 | — | ◐ LIKELY ACTIVE |
| OSOldcastle Stone Products | Lee | MA | Nonmetallic Mineral Product Manufacturing327410 | — | ◐ LIKELY ACTIVE |
| OCOlin Chemical Site | Wilmington | MA | Chemical Manufacturing325188 | — | ◐ LIKELY ACTIVE |
| OIOptogration, INC. | Wilmington | MA | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| ONOrganogenesis - Norwood | Norwood | MA | Chemical Manufacturing325414 | 20-99 | ◐ LIKELY ACTIVE |
| PIPackage Industries INC | Sutton | MA | Fabricated Metal Product Manufacturing332311 | — | ◐ LIKELY ACTIVE |
| PPPalmer Paving CORP | Springfield | MA | Petroleum and Coal Products Manufacturing324110 | — | ◐ LIKELY ACTIVE |
| PPPalmer Paving CORP | Palmer | MA | Petroleum and Coal Products Manufacturing324110 | — | ◐ LIKELY ACTIVE |
Paragon Manufacturing | Westfield | MA | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| PCParker-hannifin Corporation | Woburn | MA | Miscellaneous Manufacturing339991 | — | ◐ LIKELY ACTIVE |
| PTPartner Therapeutics Inc, HQ | Lexington | MA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| PEPayne Engineering & Fabrication Co., INC. | Canton | MA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| PBPiantedosi Baking Company INC | Malden | MA | Food Manufacturing311812 | 100-499 | ◐ LIKELY ACTIVE |
| PPPilot Precision Products, LLC | South Deerifeld | MA | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| PSPlaskolite Sheffield, LLC | Sheffield | MA | Plastics and Rubber Products Manufacturing326113 | 20-99 | ◐ LIKELY ACTIVE |
| PPPlug Power Concord Electrolyzers | Concord | MA | Electrical Equipment, Appliance & Component Manufacturing335999 | 20-99 | ◐ LIKELY ACTIVE |
| PCPolnox Corporation | Lowell | MA | Chemical Manufacturing325998 | 1-19 | ◐ LIKELY ACTIVE |
| PSPoyant Signs | New Bedford | MA | Miscellaneous Manufacturing339950 | 20-99 | ◐ LIKELY ACTIVE |