| MMMarlborough MA | Marlborough | MA | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| MTMA Tewksbury | Tewskbury | MA | Computer and Electronic Product Manufacturing334513 | 20-99 | ◐ LIKELY ACTIVE |
| MTMetaphos Technology, INC. | Cambridge | MA | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| MPMettler-toledo Process Analytics, INC. | Billerica | MA | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| MTMicrochip Technology Inc Westborough MA | Westborough | MA | Computer and Electronic Product Manufacturing334413 | 20-99 | ◐ LIKELY ACTIVE |
| MFMicrosemi Frequency and Time CORP | Beverly | MA | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
| MIMicroTek, Inc. | Chicopee | MA | Computer and Electronic Product Manufacturing334419 | 20-99 | ◐ LIKELY ACTIVE |
| MDMicrowave Development Laboratories, INC. | Needham Heights | MA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| MIMicroway, INC. | Plymouth | MA | Computer and Electronic Product Manufacturing334111 | — | ▲ REPORTED CLOSED |
| MWMillimeter Wave Systems LLC | Amherst | MA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| M2MKS 2 Tech | Andover | MA | Computer and Electronic Product Manufacturing334413 | 100-499 | ◐ LIKELY ACTIVE |
| MSMotorola Solutions Inc. | Framingham | MA | Computer and Electronic Product Manufacturing334220 | 20-99 | ◐ LIKELY ACTIVE |
| MIMultiscale Innovations LLC | Lincoln | MA | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| NRNational Resource Management INC | Canton | MA | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| NMNelson Miller Group-Fitchburg MA | Fitchburg | MA | Computer and Electronic Product Manufacturing334111 | 20-99 | ◐ LIKELY ACTIVE |
| NINortekusa, INC | Boston | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| NMNorwood, MA. | Norwood | MA | Computer and Electronic Product Manufacturing334413 | 20-99 | ◐ LIKELY ACTIVE |
| NINotch INC. | Cambridge | MA | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
Optikos, LLC | Wakefield | MA | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| PTParallel Technologies, INC. | Randolph | MA | Computer and Electronic Product Manufacturing334118 | — | ◐ LIKELY ACTIVE |
| PTPersimmon Technologies Corporation | Bedford | MA | Computer and Electronic Product Manufacturing334413 | 100-499 | ◐ LIKELY ACTIVE |
| PRPhilips Rs North America LLC | Cambridge | MA | Computer and Electronic Product Manufacturing334510 | — | ◐ LIKELY ACTIVE |
| PSPhotonis Scientific, Inc. | Sturbridge | MA | Computer and Electronic Product Manufacturing334419 | 20-99 | ◐ LIKELY ACTIVE |
| PCPittsfield Communications Systems INC | Pittsfield | MA | Computer and Electronic Product Manufacturing334290 | — | ◐ LIKELY ACTIVE |
| PEPowell Electronics INC | Marlborough | MA | Computer and Electronic Product Manufacturing334417 | — | ◐ LIKELY ACTIVE |
| PProdrive | Canton | MA | Computer and Electronic Product Manufacturing334111 | 20-99 | ◐ LIKELY ACTIVE |
| PDProtein Dynamic Solutions, INC. | Wakefield | MA | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| PEP-tech Engineering LLC | Woburn | MA | Computer and Electronic Product Manufacturing334418 | — | ◐ LIKELY ACTIVE |
| PSPulse Systems, INC. | South Easton | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| QNQinetiq, NA Waltham | Waltham | MA | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| QCQorvo - Chelmsford (Apollo Dr) | Chelmsford | MA | Computer and Electronic Product Manufacturing334413 | 1-19 | ◐ LIKELY ACTIVE |
| QCQorvo - Chelmsford, MA | Chelmsford | MA | Computer and Electronic Product Manufacturing334413 | 100-499 | ◐ LIKELY ACTIVE |
| RMRaytheon - Marlborough | Marlborough | MA | Computer and Electronic Product Manufacturing334511 | 500+ | ◐ LIKELY ACTIVE |
| RCRemotereality CORP | Westborough | MA | Computer and Electronic Product Manufacturing334310 | — | ◐ LIKELY ACTIVE |
| RIRevvity INC | Waltham | MA | Computer and Electronic Product Manufacturing334510 | — | ◐ LIKELY ACTIVE |
| RCRichardson Canvys | Marlborough | MA | Computer and Electronic Product Manufacturing334419 | 20-99 | ◐ LIKELY ACTIVE |
| SISaab, INC | Quincy | MA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| SISaab Inc. - Quincy | Quincy | MA | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| SSSavant Systems, Inc. | Hyannis | MA | Computer and Electronic Product Manufacturing334310 | 100-499 | ◐ LIKELY ACTIVE |
Sea Machines Robotics, INC | Boston | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| SCSeminex Corporation | Danvers | MA | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| SSetra | Boxborough | MA | Computer and Electronic Product Manufacturing334513 | 100-499 | ◐ LIKELY ACTIVE |
| SCSICK Canton | Canton | MA | Computer and Electronic Product Manufacturing334513 | 20-99 | ◐ LIKELY ACTIVE |
| SSigcom | Woburn | MA | Computer and Electronic Product Manufacturing334111 | 20-99 | ◐ LIKELY ACTIVE |
| SMSirtex Medical | Wilmington | MA | Computer and Electronic Product Manufacturing334517 | 20-99 | ◐ LIKELY ACTIVE |
| SRSJE- Randolph | Randolph | MA | Computer and Electronic Product Manufacturing334513 | 20-99 | ◐ LIKELY ACTIVE |
| SSSkyworks Solutions, Inc. - Andover, MA | Andover | MA | Computer and Electronic Product Manufacturing334413 | 100-499 | ◐ LIKELY ACTIVE |
| SASmart Appraisal LLC | Andover | MA | Computer and Electronic Product Manufacturing334511 | — | ▲ REPORTED CLOSED |
| SESmrc Engineering INC | Sharon | MA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| SCSMTC Corporation Bil | Billerica | MA | Computer and Electronic Product Manufacturing334418 | 20-99 | ◐ LIKELY ACTIVE |