| CCCurtiss-wright Controls Embedded Computing | Littleton | — | ◇ UNVERIFIED |
| DEDigital Equipment Company | Hudson | — | ◇ UNVERIFIED |
| DEDigital Equipment Corporation | Acton | — | ◇ UNVERIFIED |
 Doble Engineering Company | Watertown | — | ◇ UNVERIFIED |
| ECElectro Circuits Incorporated | Lowell | — | ◇ UNVERIFIED |
| ESEnergy Sciences INC | Wilmington | — | ◇ UNVERIFIED |
| ESEnterprise Solutions | Bedford | — | ◇ UNVERIFIED |
| FSFenwal Safety Systems | Marlborough | — | ◇ UNVERIFIED |
| FFFuji Film Recording Media Mfg | Bedford | — | ◇ UNVERIFIED |
| GIGe Infrastructure Sensing INC | Billerica | — | ◇ UNVERIFIED |
| HIHologic INC | Bedford | — | ◇ UNVERIFIED |
| HSHoneywell Sensing and Control | Acton | — | ◇ UNVERIFIED |
| HCHudson Creek LLC CO | Hudson | — | ◇ UNVERIFIED |
| IFIntel Fab 17 Semiconductor Manufacturing | Hudson | — | ◇ UNVERIFIED |
| JCJabil Circuit | Billerica | — | ◇ UNVERIFIED |
| KTKonarka Technologies | Lowell | — | ◇ UNVERIFIED |
| LCL3 Communications Essco INC | Ayer | — | ◇ UNVERIFIED |
| LCL3 Communications Security & Detection Systems | Woburn | — | ◇ UNVERIFIED |
| LDLupoli Development | Littleton | — | ◇ UNVERIFIED |
| MDMicro - Dynamics | Woburn | — | ◇ UNVERIFIED |
| MMMicrosemi Microwave Products | Lowell | — | ◇ UNVERIFIED |
| MUMicro Uspd Incorporated Semiconductor Products Division | Watertown | — | ◇ UNVERIFIED |
| MTMide Technology Corporation | Woburn | — | ◇ UNVERIFIED |
| MIMks Instruments | Wilmington | — | ◇ UNVERIFIED |
| NINantero INC | Woburn | — | ◇ UNVERIFIED |
| NDNetwork Drive Owner LLC | Burlington | — | ◇ UNVERIFIED |
| NONip Owner LLC | Tewksbury | — | ◇ UNVERIFIED |
| PCPlexus Corp.- Ama | Ayer | — | ◇ UNVERIFIED |
| PCPrinted Circuit CORP | Woburn | — | ◇ UNVERIFIED |
| RCRaytheon Company Mpt | Waltham | — | ◇ UNVERIFIED |
| RCRaytheon Company Ssc | Sudbury | — | ◇ UNVERIFIED |
| RFRaytheon Former Waltham Facil | Waltham | — | ◇ UNVERIFIED |
| RIRaytheon Ids Headquarters | Tewksbury | — | ◇ UNVERIFIED |
| RRevvity | Hopkinton | — | ◇ UNVERIFIED |
| SCSanmina CORP | Wilmington | — | ◇ UNVERIFIED |
| SSSchott Solar INC | Billerica | — | ◇ UNVERIFIED |
| SCSemicon Components | Burlington | — | ◇ UNVERIFIED |
| SSSetra Systems Incorporated | Acton | — | ◇ UNVERIFIED |
| SLSheaumann Laser INC | Marlborough | — | ◇ UNVERIFIED |
| STSilicon Transistor C | Chelmsford | — | ◇ UNVERIFIED |
| SCSipex Corporation | Billerica | — | ◇ UNVERIFIED |
| SVSloan Valve Arichell Technologies Div | West Newton | — | ◇ UNVERIFIED |
| TFTeledyne Flir Surveillance INC | N. Billerica | — | ◇ UNVERIFIED |
| TETrombetta Electronics | Malden | — | ◇ UNVERIFIED |
| TETyco Electronics | Burlington | — | ◇ UNVERIFIED |
| TCTympanium Corporation | Malden | — | ◇ UNVERIFIED |
| WRWellesley Rosewood Maynard Mills | Maynard | — | ◇ UNVERIFIED |
| WRWyeth Research | Cambridge | — | ◇ UNVERIFIED |
| 1A1 Analog Way | Wilmington | 500+ | ◐ LIKELY ACTIVE |
| 2A20 Alpha Rd. Chelmsford, MA | Chelmsford | 100–499 | ◐ LIKELY ACTIVE |
