| PKPj Keating Company | Acushnet | MA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PSPlainville Stock | Plainville | MA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| PIPlastican Incorporated | Leominster | MA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| PCPliant CORP | Deerfield | MA | Plastics and Rubber Products Manufacturing326113 | — | ◇ UNVERIFIED |
| PRPlymouth Rubber Company | Canton | MA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| PCPlz CORP. | Fall River | MA | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| PCPolar CORP | Worcester | MA | Beverage and Tobacco Product Manufacturing312111 | — | ◇ UNVERIFIED |
| PCPolaroid CORP | Cambridge | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| PCPolaroid Corporation | Waltham | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| PPolaroid (former) | Waltham | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| PPolartec | Lawrence | MA | Textile Mills313241 | — | ◇ UNVERIFIED |
 Polycarbon Industries INC | Ayer | MA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| Polycarbon Industries, INC. | Leominster | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| PLPolyclad Laminates | Millbury | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PLPolyfiber LLC | Attleboro | MA | Paper Manufacturing322221 | — | ◇ UNVERIFIED |
| PCPolyfoam Corporation | Northbridge | MA | Plastics and Rubber Products Manufacturing326140 | 100-499 | ◇ UNVERIFIED |
| PPPolyfoam Precision Molded Products | Northbridge | MA | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| PCPolymer Concentrates | Clinton | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PLPolymerine LTD | New Bedford, City of | MA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| PIPolymer Injection Molding | Monson | MA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| PTPolymer Technology | Wilmington | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| PAPpg Aerospace Cuming Microwave | Avon | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PMPp Manufacturing CORP | Framingham | MA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| PAPrecious Alloy Refining LLC | Stoughton | MA | Computer and Electronic Product Manufacturing334111 | — | ◇ UNVERIFIED |
| PCPrecision Coating Company Incorporated | Dedham | MA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| PTPrecision Tape & Label Company INC | Uxbridge | MA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| PPPrecix Plant D | New Bedford | MA | Plastics and Rubber Products Manufacturing326291 | — | ◇ UNVERIFIED |
| PIPridecraft INC | North Andover | MA | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| PPPride Printers Incorporated | Woburn | MA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| PCPrinted Circuit CORP | Woburn | MA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| PCPrintery CORP | Holliston | MA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| PCPro Corporation Pmc | Florence | MA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| PIProfiles INC | Palmer | MA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| PPPro Pel East LLC | South Deerfield | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| QLQg LLC | Taunton, Town of | MA | Printing and Related Support Activities323117 | — | ◇ UNVERIFIED |
| QPQg Printing Ii CORP | East Longmeadow | MA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| QGQuad Graphics Taunton Retail | Taunton | MA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| QFQuaker Fabric | Fall River | MA | Apparel Manufacturing315250 | — | ◇ UNVERIFIED |
| QFQuaker Fabric Mill (former) | Fall River | MA | Textile Mills313210 | — | ◇ UNVERIFIED |
| QFQuaker Fabric Plant | Fall River | MA | Textile Product Mills314991 | — | ◇ UNVERIFIED |
| QFQuaker Fabric Plant N | Fall River | MA | Textile Mills313320 | — | ◇ UNVERIFIED |
 Quality Metal Finishing INC | Chelsea | MA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| QPQuebecor Printing | Leominster | MA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| QRQuinzani Realty LLC | Boston | MA | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| RCRalph Curcio CO | Gardner | MA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| RWRand Whitney Container LLC | Worcester | MA | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| RBRau Brothers | Winchendon | MA | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| RCRaytheon Company Mpt | Waltham | MA | Computer and Electronic Product Manufacturing334411 | — | ◇ UNVERIFIED |
| RCRaytheon Company Ssc | Sudbury | MA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| RSRaytheon Systems CO | Lexington | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
