| AVAdvanced Vacuum Company | Westminster | MD | Machinery Manufacturing333912 | 20-99 | ◐ LIKELY ACTIVE |
| NSNorthrop-grumman Systems CORP. - Atl | Linthicum | MD | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems CORP. - Bwi | Linthicum | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| ATAmpx Technologies, INC. | College Park | MD | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| ALAtg LLC | Rockville | MD | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
Crowley Micrographics, INC. | Frederick | MD | Computer and Electronic Product Manufacturing334118 | — | ◐ LIKELY ACTIVE |
Integrated Imaging INC | Ellicott City | MD | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
Nanehi Networks LLC | Lutherville Timonium | MD | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
Ncr Government Systems LLC | Germantown | MD | Computer and Electronic Product Manufacturing334118 | — | ◐ LIKELY ACTIVE |
Rfnav INC | Glenelg | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| SISeakeeper, INC. | California | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| SLStacato LLC | Rockville | MD | Computer and Electronic Product Manufacturing334310 | 1-19 | ◐ LIKELY ACTIVE |
Syntonics LLC | Columbia | MD | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
| TWTaylor Water Technologies - Main | Sparks | MD | Computer and Electronic Product Manufacturing334513 | 100-499 | ◐ LIKELY ACTIVE |
| TLTechno-sciences, LLC | Lanham | MD | Computer and Electronic Product Manufacturing334511 | 20-99 | ◐ LIKELY ACTIVE |
| TDThales Defense & Security INC | Clarksburg | MD | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
Zeltex LLC | Hagerstown | MD | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| GEGalaxy Electryronics Associates INC | Laurel | MD | Computer and Electronic Product Manufacturing334412 | 1-19 | ◇ UNVERIFIED |
| AIAerico Industries INC | Forest Hill | MD | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| ACArcadian Computers LLC | La Plata | MD | Computer and Electronic Product Manufacturing334111 | 1-19 | ◐ LIKELY ACTIVE |
| BCBlanchard Communications | Annapolis | MD | Computer and Electronic Product Manufacturing334220 | 1-19 | ◐ LIKELY ACTIVE |
| EWEmanate Wireless, INC. | Ijamsville | MD | Computer and Electronic Product Manufacturing334515 | 1-19 | ▲ REPORTED CLOSED |
| GBGowanda BTI LLC DBA Microwave Circuits | Beltsville | MD | Computer and Electronic Product Manufacturing334416 | 1-19 | ◐ LIKELY ACTIVE |
| KMK&l Microwave LLC | Salisbury | MD | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
| LCL-3 Chesapeake Sciences CORP | Millersville | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems Corporation | Annapolis | MD | Computer and Electronic Product Manufacturing334290 | — | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems Corporation | Sykesville | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| SIShireen INC | Germantown | MD | Computer and Electronic Product Manufacturing334220 | 1-19 | ◐ LIKELY ACTIVE |
| TITecore, INC. | Hanover | MD | Computer and Electronic Product Manufacturing334220 | 20-99 | ▲ REPORTED CLOSED |
| WSWgs Systems, LLC | Frederick | MD | Computer and Electronic Product Manufacturing334511 | 1-19 | ◐ LIKELY ACTIVE |
| AAAllied-signal Aerospace CO. Microelectronics & Technology Cntr | Columbia | MD | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| LTLr Technologies, INC. | Rockville | MD | Computer and Electronic Product Manufacturing334220 | 1-19 | ◐ LIKELY ACTIVE |
| NGNorthrop Grumman Systems Corporation - Troy Hill 1 | Elkridge | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| TFTeledyne Flir Defense, INC. | Elkridge | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| WRWebtec Railway Electronics | Germantown | MD | Computer and Electronic Product Manufacturing334418 | — | ◐ LIKELY ACTIVE |
| WCWorcester County Dpw | Berlin | MD | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| AAbiomed | Baltimore City | MD | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| ACAirpax CORP. | Cambridge | MD | Computer and Electronic Product Manufacturing334000 | — | ◇ UNVERIFIED |
| A1Annapolis 1 | Annapolis | MD | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |
| ARAntenna Research Associates INC | Beltsville | MD | Computer and Electronic Product Manufacturing334220 | — | ◇ UNVERIFIED |
| ATApi Technologies-weinschel | Frederick | MD | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| ANApplied Nanostructured Solutions, LLC. | Baltimore | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| DSDrs-signal Solutions INC | Gaithersburg | MD | Computer and Electronic Product Manufacturing334310 | — | ◇ UNVERIFIED |
| GDGeneral Dynamics Robotics System | Westminster | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| GDGeneral Dynamics Robotic Sys | Westminster | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| ICIbm Corporation | Gaithersburg | MD | Computer and Electronic Product Manufacturing334113 | — | ◇ UNVERIFIED |
| MMMartin Marietta Laboratories | Halethorpe | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| NGNorthrop Grumman Sys CORP | Gaithersburg | MD | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| NGNorthrop Grumman Systems CORP -troy Hill 4 | Elkridge | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| QAQuad Avenue Chemical & Biofuels Site | Baltimore | MD | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |