| CBCustom Built Pneumatics INC | Blue Earth | MN | — | ◇ UNVERIFIED |
| CCCustom Contract Manufacturing LLC | Hillsboro | OR | — | ◇ UNVERIFIED |
 Custom Control Sensors INC | Chatsworth | CA | — | ◇ UNVERIFIED |
| CCCustom Controls of Arizona, Inc. | Phoenix | AZ | — | ◇ UNVERIFIED |
 Custom Machine Works, Inc. | Fayetteville | AR | — | ◇ UNVERIFIED |
| CHCutler Hammer Electrical CO | Las Piedras | PR | — | ◇ UNVERIFIED |
| CHCutler Hammer Electrical Company | Coamo | PR | — | ◇ UNVERIFIED |
| CSCx Systems, INC. | Lincolnton | NC | — | ◇ UNVERIFIED |
| CMCyto Meridian INC. | Lehigh Acres | FL | — | ◇ UNVERIFIED |
| DSDaa Seattle | Auburn | WA | — | ◇ UNVERIFIED |
| DADaher Aerospace | Stuart | FL | — | ◇ UNVERIFIED |
| DCDanaher Controls | Gurnee | IL | — | ◇ UNVERIFIED |
| DAD and L Enterprises, LLC | Reno | NV | — | ◇ UNVERIFIED |
| DFDassault Falcon Jet-teb | Little Ferry | NJ | — | ◇ UNVERIFIED |
| DTDatabee Technologies, LLC | Southwest Ranches | FL | — | ◇ UNVERIFIED |
| DLDavincia, LLC Dba Link Electronics | Jackson | MO | — | ◇ UNVERIFIED |
| DTDavis Technologies LLC | Chandler | AZ | — | ◇ UNVERIFIED |
| DTDaystar Technologies | Santa Clara | CA | — | ◇ UNVERIFIED |
| DBD Boudreau Electric | Lexington | MA | — | ◇ UNVERIFIED |
| DCDCI Corporation | North Salt Lake | UT | — | ◇ UNVERIFIED |
| DLDDP, Ltd | Machesney Park | IL | — | ◇ UNVERIFIED |
 Deep Ocean Engineering, INC. | San Jose | CA | — | ◇ UNVERIFIED |
| D9DelRose 9251, LLC | Frederick | CO | — | ◇ UNVERIFIED |
| DCDelta Controls Corporation | Shreveport | LA | — | ◇ UNVERIFIED |
| DFDelta Flight Products, LLC - Atl Operations | Atlanta | GA | — | ◇ UNVERIFIED |
| DIDelta-Ray Industries, Inc. | Litchfield | CT | — | ◇ UNVERIFIED |
| DCDeltatech Controls USA LLC | Shakopee | MN | — | ◇ UNVERIFIED |
| DTDelta Technologies | Chicago | IL | — | ◇ UNVERIFIED |
| DODepartment of Defense | Corpus Christi | TX | — | ◇ UNVERIFIED |
| DFDesign Fabricators INC | Boulder | CO | — | ◇ UNVERIFIED |
| DSDetection Systems INC | Fairport | NY | — | ◇ UNVERIFIED |
| DHDG Holdings, Inc. | Anaheim | CA | — | ◇ UNVERIFIED |
 Digital Prototype Systems INC Dba Dps Telecom | Fresno | CA | — | ◇ UNVERIFIED |
| DLDiode Laser Concepts INC | Central Point | OR | — | ◇ UNVERIFIED |
| DPDI Properties LLC | Willmar | MN | — | ◇ UNVERIFIED |
| DCDiversified Computer Supplies INC | Stanton | KY | — | ◇ UNVERIFIED |
| DADixie Aerospace | Atlanta | GA | — | ◇ UNVERIFIED |
 D-j Engineering, INC. | Augusta | KS | — | ◇ UNVERIFIED |
| D-j Engineering INC - Bldg 4a (stormwater) | Augusta | KS | — | ◇ UNVERIFIED |
| D-j Engineering INC - Bldgs 5c & 5e (stormwater) | Augusta | KS | — | ◇ UNVERIFIED |
| D-j Engineering INC - East-1011 (stormwater) | Augusta | KS | — | ◇ UNVERIFIED |
| D-j Engineering INC - East-810 (stormwater) | Augusta | KS | — | ◇ UNVERIFIED |
| DSDon Schumacher Racing | Brownsburg | IN | — | ◇ UNVERIFIED |
| DDoorking | Inglewood | CA | — | ◇ UNVERIFIED |
| DDor-o-matic | Harwood Heights | IL | — | ◇ UNVERIFIED |
| DEDouglas Electronics INC | San Leandro | CA | — | ◇ UNVERIFIED |
 Douglass Innovations, Inc | Spicer | MN | — | ◇ UNVERIFIED |
| DMDowney Mfg INC | Downey | CA | — | ◇ UNVERIFIED |
| DIDresser Industries INC. Instrument Div. | Berea | KY | — | ◇ UNVERIFIED |
| DADretloh Aircraft Supply | Anaheim | CA | — | ◇ UNVERIFIED |
