| MMMckinstry Metal Works INC. | Chicopee | — | ◇ UNVERIFIED |
| MEMcstowe Engineering | East Bridgewater | — | ◇ UNVERIFIED |
| MIMetalogic Industries LLC | Southbridge | — | ◇ UNVERIFIED |
| MPMillenium Plating Company | Lowell | — | ◇ UNVERIFIED |
| MSMka Spray Service | Lawrence | — | ◇ UNVERIFIED |
| MAModern Aluminum Anod | N Adams | — | ◇ UNVERIFIED |
| MAModern Aluminum Anodizing | North Adams | — | ◇ UNVERIFIED |
| MTMold Tech Northeast | Chicopee | — | ◇ UNVERIFIED |
| MCMontrose Cdt | Auburn | — | ◇ UNVERIFIED |
| MCMorgan Construction (siemens) | Worcester | — | ◇ UNVERIFIED |
| MIMsm Industries Incorporated | North Reading | — | ◇ UNVERIFIED |
| MPMystic Plating CORP | Medford | — | ◇ UNVERIFIED |
| NCNai Cranes LLC | Woburn | — | ◇ UNVERIFIED |
| NMNash Manufacturing & Grinding Services | Springfield | — | ◇ UNVERIFIED |
| NVNashoba Valley Structural | Lunenburg | — | ◇ UNVERIFIED |
| NPNational Perforating CORP | Clinton | — | ◇ UNVERIFIED |
| NENew England Compressor Exchan | Woburn | — | ◇ UNVERIFIED |
| NENew England Expert Technologies Ne Xt | Greenfield | — | ◇ UNVERIFIED |
| NSNichols & Stone CO | Gardner | — | ◇ UNVERIFIED |
| NMNorpin Mfg CO INC | Ludlow | — | ◇ UNVERIFIED |
| NNu-chrome | Fall River | — | ◇ UNVERIFIED |
| OCOctober CO Chemetal Division | Easthampton | — | ◇ UNVERIFIED |
| OLOmega Laboratories | Rowley | — | ◇ UNVERIFIED |
| PGPan Glo | Worcester | — | ◇ UNVERIFIED |
| PIParatronix Incorporated | Attleboro, City of | — | ◇ UNVERIFIED |
| PEPayne Engineering & Fabrications | Canton | — | ◇ UNVERIFIED |
| PMPerkins Machine CO | Warren | — | ◇ UNVERIFIED |
| PMPhilipp Mfg CO INC | Easthampton | — | ◇ UNVERIFIED |
| PCPioneer Consolidated | North Oxford | — | ◇ UNVERIFIED |
| PCPrecision Coating Company Incorporated | Dedham | — | ◇ UNVERIFIED |
| PIProcoating Incorporated | Woburn | — | ◇ UNVERIFIED |
| PEProduction Enameling | Brockton | — | ◇ UNVERIFIED |
 Quality Metal Finishing INC | Chelsea | — | ◇ UNVERIFIED |
| RMRaytheon Missile Systems Division | Bedford | — | ◇ UNVERIFIED |
| RBReed & Barton Silver | Taunton | — | ◇ UNVERIFIED |
| RNReed National CORP | Westfield | — | ◇ UNVERIFIED |
| RPReed & Prince Mfg CO | Worcester | — | ◇ UNVERIFIED |
| RMReflek Manufacturing INC | Fall River | — | ◇ UNVERIFIED |
| REReliable Electro Plating INC | Norton | — | ◇ UNVERIFIED |
| RIRemtec INC Dba Tecmark | Norwood | — | ◇ UNVERIFIED |
| RCRex Cut Products Incorporated | Fall River, City of | — | ◇ UNVERIFIED |
| RCRexnord CORP | Springfield | — | ◇ UNVERIFIED |
| RCRichardson Charles a INC | Mansfield | — | ◇ UNVERIFIED |
| RPRiley Power INC | Worcester | — | ◇ UNVERIFIED |
| RPRoyal Plating & Polishing INC | Pittsfield | — | ◇ UNVERIFIED |
| RMRugg Manufacturing Company | Greenfield | — | ◇ UNVERIFIED |
| SESaeilo Enterprises | Worcester, City of | — | ◇ UNVERIFIED |
| SESchneider Electric | Foxboro | — | ◇ UNVERIFIED |
| SESchott Electronic Packaging | Southbridge | — | ◇ UNVERIFIED |
| STSem Tec INC | Worcester | — | ◇ UNVERIFIED |
