| 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 |
| 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 |
| SISpecs-tii INC | Mansfield | MA | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| SISpeedgoat INC | Framingham | MA | Computer and Electronic Product Manufacturing334111 | — | ◐ LIKELY ACTIVE |
| SMSureScan MA Corporation | Boxborough | MA | Computer and Electronic Product Manufacturing334517 | 20-99 | ◐ LIKELY ACTIVE |
| TLTbd Labs LLC | Framingham | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| TDTeledyne Defense Electronics, LLC | Salem | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| TFTeledyne FLIR Billerica | North Billerica | MA | Computer and Electronic Product Manufacturing334413 | 100-499 | ◐ LIKELY ACTIVE |
| TFTeledyne Flir Unmanned Ground Systems, INC | Chelmsford | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| TFTeledyne Flir Unmanned Ground Systems, INC | North Billerica | MA | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| TQTeledyne Qioptiq Salem | Salem | MA | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| TDTemptronic DBA InTEST Thermal Solutions | Mansfield | MA | Computer and Electronic Product Manufacturing334515 | 20-99 | ◐ LIKELY ACTIVE |
| TCTMEA - Chelmsford | Chelmsford | MA | Computer and Electronic Product Manufacturing334413 | 20-99 | ◐ LIKELY ACTIVE |
| UBUltra - Bower Rd Extension | Quincy | MA | Computer and Electronic Product Manufacturing334511 | 1-19 | ◐ LIKELY ACTIVE |
| UCUltra - Campanelli Drive | Braintree | MA | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| ULUnisite, LLC | Boston | MA | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
| VBViasat - Boston, MA | Boston | MA | Computer and Electronic Product Manufacturing334220 | 20-99 | ◐ LIKELY ACTIVE |
| VMViasat - Marlborough, MA | Marlborough | MA | Computer and Electronic Product Manufacturing334220 | 20-99 | ◐ LIKELY ACTIVE |
| VMVje Ma | Chelmsford | MA | Computer and Electronic Product Manufacturing334517 | 20-99 | ◐ LIKELY ACTIVE |
| WMWaters- Milford | Milford | MA | Computer and Electronic Product Manufacturing334516 | 500+ | ◐ LIKELY ACTIVE |
| WWestborough | Westborough | MA | Computer and Electronic Product Manufacturing334290 | 1-19 | ◐ LIKELY ACTIVE |
| WMWestford MA | Westford | MA | Computer and Electronic Product Manufacturing334515 | 20-99 | ◐ LIKELY ACTIVE |
| XCXeresearch Corporation | Burlington | MA | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| SASpectra Analysis Instruments INC | Marlborough | MA | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| 1B1 Beyond, Inc. | Charlestown | MA | Computer and Electronic Product Manufacturing334310 | 1-19 | ◇ UNVERIFIED |
| ATAlto Technologies Corporation | Sterling | MA | Computer and Electronic Product Manufacturing334310 | 20-99 | ◇ UNVERIFIED |
| AAAndover Audio, LLC | North Andover | MA | Computer and Electronic Product Manufacturing334310 | 1-19 | ◇ UNVERIFIED |
| CCCape Cod Wind & Weather, Inc. | West Harwich | MA | Computer and Electronic Product Manufacturing334519 | 1-19 | ◇ UNVERIFIED |
| CCChelsea Clock LLC the | Chelsea | MA | Computer and Electronic Product Manufacturing334519 | 1-19 | ◇ UNVERIFIED |
| CIConvectronics, INC. | Haverhill | MA | Computer and Electronic Product Manufacturing334519 | 1-19 | ◇ UNVERIFIED |
| DEDesco Electronics INC | Plainville | MA | Computer and Electronic Product Manufacturing334220 | 1-19 | ◇ UNVERIFIED |
| EBElpis Biopharmaceuticals | Lexington | MA | Computer and Electronic Product Manufacturing334516 | 20-99 | ◇ UNVERIFIED |
| MEMcf Electronic Services | Lowell | MA | Computer and Electronic Product Manufacturing334418 | 1-19 | ◇ UNVERIFIED |
| MRMcLane Research Laboratories, Inc. | East Falmouth | MA | Computer and Electronic Product Manufacturing334516 | 20-99 | ◇ UNVERIFIED |
| MCMegatech Corporation | Tewksbury | MA | Computer and Electronic Product Manufacturing334513 | 1-19 | ◇ UNVERIFIED |
Remote Sensing Solutions, Inc. | Barnstable | MA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| RIRemtec INC | Norwood | MA | Computer and Electronic Product Manufacturing334419 | 20-99 | ◇ UNVERIFIED |
| UNUrsa Navigation Solutions, Inc. | North Billerica | MA | Computer and Electronic Product Manufacturing334511 | 1-19 | ◇ UNVERIFIED |
| 3T3m Touch Systems (haverhill) | Haverhill | MA | Computer and Electronic Product Manufacturing334119 | — | ◇ UNVERIFIED |
| 4B495 Bc Investors LLC | Tewksbury | MA | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| 9D908 Devices INC | Boston | MA | Computer and Electronic Product Manufacturing334516 | — | ◇ UNVERIFIED |