| MEMaibec Eastern INC | Stoughton | MA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| MTMatheson Tri-gas | Gloucester | MA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| MPMillennium Pharmaceuticals INC | Cambridge | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| MTModerna Therapeutics | Cambridge | MA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| MTModerna Therapeutics INC. | Norwood | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| MDModern Dispersion | Leominster | MA | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| MCMonson Chemical Distribution | Leominster | MA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| MCMultilayer Coating Technologies | New Bedford | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| MFMwra Fore River Staging Area | Quincy | MA | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| MIMylec INC | Winchendon | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| NPNatural Pharmaceuticals | Fall River | MA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| NENew England Plastic | Norton | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| NENew England Treatment Access | Franklin | MA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| NMNew Model Cleaners INC. | Boston | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| NCNorthrop CORP. Electronics Sys. Div. Plant 8 | Norwood | MA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| NCNova Chemicals INC | Indian Orchard | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| NCNubrite Chemical CO R-3 | Taunton | MA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| N1Nv 11 State Fund LLC | Woburn | MA | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| PIParatronix Incorporated | Attleboro | MA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| PLPerkinelmer Life Sciences INC | Boston | MA | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| PRPfizer Research | Andover | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| PRPfizer Research | Cambridge | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| PCPharmasol Contract Development & Manufacturing | South Easton | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| PCPlz CORP. | Fall River | MA | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| PCPolaroid CORP | Cambridge | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| PCPolaroid Corporation | Waltham | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| PPolaroid (former) | Waltham | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
 Polycarbon Industries INC | Ayer | MA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| Polycarbon Industries, INC. | Leominster | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| PLPolyclad Laminates | Millbury | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PCPolymer Concentrates | Clinton | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PLPolymerine LTD | New Bedford, City of | MA | Chemical Manufacturing325199 | — | ◇ 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 |
| PPPro Pel East LLC | South Deerfield | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| RSRaytheon Systems CO | Lexington | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| RKRb Kendall Fee LLC | Cambridge | MA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| RCRevolutionary Clinics | Fitchburg | MA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| SISabic Innovative Plastics | Pittsfield | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SISabic Innovative Plastics | Pittsfield | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SHSafc Hitech | Haverhill | MA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| SOSalem Oil & Grease CO | Salem | MA | Chemical Manufacturing325613 | — | ◇ UNVERIFIED |
| SSanofi | Waltham | MA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| SWSherwin Williams 5229 | Lowell | MA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SShire | North Reading | MA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| SPShire Pharmaceuticals | Cambridge | MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SESidmar Enterprises INC | Holbrook | MA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| SCSkyline Composite INC | Fall River | MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SLSouthwin LTD | Leominster | MA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
