| Brierley Associates Corporation | Englewood | CO | Subcontractor |
| Brilligent Solutions, LLC | Fairborn | OH | Subcontractor |
| Bris Engineering, LLC | Baton Rouge | LA | $0 |
| Brisk Innovations LLC | Lisle | IL | $0 |
| Brock & Bustillos Inc. | El Paso | TX | $0 |
| Brock Roberts | Albuquerque | NM | Subcontractor |
| Brokaw Design | Rohnert Park | CA | Subcontractor |
| Bromgrove Management Consultancies L.L.C | Dubai | | $0 |
| Brooks Fire Protection Engineering, Inc. | Severna Park | MD | Subcontractor |
| Brooks Fire Protection Engineering, LLC | Lenexa | KS | Subcontractor |
| Brown Consulting Engineers, P.C. | St George | UT | Subcontractor |
| Brown Engineers LLC | Little Rock | AR | Subcontractor |
| Brown, Mitchell & Alexander, Inc. | Gulfport | MS | Subcontractor |
| Browns Hill Engineering & Controls, LLC | Littleton | CO | Subcontractor |
| Broyles And Associates, P.C. | Chesapeake | VA | Subcontractor |
| BRPH Mission Solutions Inc. | Melbourne | FL | Subcontractor |
| B.R.S. Inc. | Riverton | WY | $0 |
| Brudis & Associates, Inc. | Columbia | MD | $0 |
| Brumbaugh Engineering & Surveying LLC | West Milton | OH | Subcontractor |
| Bryant Associates, Inc. | Boston | MA | $0 |
| Bryant Hammett & Associates, L.L.C. | Ferriday | LA | Subcontractor |
| BSC Companies, Inc. | Boston | MA | Subcontractor |
| Building Dynamics LLC | Annapolis | MD | Subcontractor |
| Building Envelope Consultants And Scientists, LLC | Baltimore | MD | Subcontractor |
| Building Technology Associates, Inc. | Farmington Hills | MI | $0 |
| Burdette Engineering Inc. | Greenville | SC | Subcontractor |
| Burgess & Niple Inc. | Parkersburg | WV | Subcontractor |
| Burgess & Niple, Inc. | Norfolk | VA | Subcontractor |
| Burke Christopher B Engineering Ltd. | Rosemont | IL | $0 |
| Burkhalter Automation Inc. | Brandon | MS | Subcontractor |
| Burns & Mcdonnell Engineering Company, Inc. | Roanoke | VA | Subcontractor |
| Burns & Mcdonnell Western Enterprises, Inc. | Brea | CA | Subcontractor |
| Burr & Cole Consulting Engineers, Inc. | Memphis | TN | $0 |
| Burton, Roger N | Albuquerque | NM | $0 |
| Busch, Hutchison And Associates, Inc. | Baytown | TX | $0 |
| Buzzdoc LLC | Tampa | FL | Subcontractor |
| BV-HDR Sam Milcon JV | Overland Park | KS | $0 |
| BVH Integrated Services Inc. | Bloomfield | CT | Subcontractor |
| Bwe, Inc. | San Diego | CA | Subcontractor |
| BWXT Government Group, Inc. | Lynchburg | VA | $0 |
| BWXT Nuclear Energy, Inc. | Charlotte | NC | $0 |
| By Light Professional IT Services LLCFayetteville, NC · UEI D4NZJBXLZZ88 | Fayetteville | NC | Subcontractor |
| By Light Professional IT Services LLCHanover, MD · UEI DGCGV6MXK7J6 | Hanover | MD | Subcontractor |
| By Light Professional IT Services LLCSilver Spring, MD · UEI PKCPML69DVE7 | Silver Spring | MD | Subcontractor |
| C2 Robotics, Inc. | San Luis Obispo | CA | $0 |
| C4i Group LLC | Hagerstown | MD | Subcontractor |
| Ca Engineering, PSC | San Juan | PR | $0 |
| Caes Systems LLC | Richardson | TX | Subcontractor |
| C.a. Goudey & Associates | Newburyport | MA | $0 |
| Caird Sextant LLC | Annandale | VA | Subcontractor |
| Call & Nicholas, Inc. | Tucson | AZ | Subcontractor |
| Calvin, Giordano & Associates, Inc. | Fort Lauderdale | FL | $0 |
| Cambridge International Systems Inc. | N Charleston | SC | $0 |
| Campos Engineering Inc. | Dallas | TX | Subcontractor |
| Campos Epc LLC | Denver | CO | $0 |
| Can Engineering, Inc. | Greenville | SC | $0 |
| Cannon And Cannon Inc. | Knoxville | TN | Subcontractor |
| Cannon Corporation | San Luis Obispo | CA | Subcontractor |
| Cape Design Engineering Co. | Melbourne | FL | Subcontractor |
| Capital Air Balance Inc. | Ridgeland | MS | Subcontractor |
| Carl Berkowitz, PH.D LLC | Delray Beach | FL | $0 |
| Carlisle Research, LLC | Arlington | VA | Subcontractor |
| Carlson Technology Inc. | Livonia | MI | Subcontractor |
| Carlton National Resources Inc. | Wakefield | MA | Subcontractor |
| Carnahan, Proctor And Cross, Inc. | Deerfield Beach | FL | Subcontractor |
| Carnegie Strategic Design Engineers, LLC | Pittsburgh | PA | $0 |
| Carnyx LLC | Virginia Beach | VA | Subcontractor |
| Carrillo & Associates, Inc. | San Antonio | TX | Subcontractor |
| Carroll Engineering Corporation | Warrington | PA | $0 |
| Cartec Enterprises | Farmingdale | NJ | Subcontractor |
| Cartwright Engineers, PC | Logan | UT | $0 |
| Carubba Engineering Inc. | Metairie | LA | Subcontractor |
| Cascia & Associates | Stevensville | MD | Subcontractor |
| Cas Consulting And Services, Inc. | Austin | TX | $0 |
| Casper, Phillips & Associates, Inc. P.C. | University Place | WA | Subcontractor |
| Castellum Inc. | Hollywood | MD | Subcontractor |
| Cator Ruma & Associates, Co. | Lakewood | CO | $0 |
| Catshot Group, LLC | Gilford | NH | Subcontractor |
| Cavern Solutions Inc. | Houston | TX | Subcontractor |
| C & C Consulting Engineers, LLC | Brighton | MA | $0 |
| C.c. Johnson & Malhotra, P.C. | Rockville | MD | $0 |
| CDM Caribbean Engineers PSC | Guaynabo | PR | Subcontractor |
| CDM Engineering Ukraine, LLC | Kyiv | | Subcontractor |
| CDR Maguire Inc. | Miami | FL | $0 |
| Cd Wolf LLC | Omaha | NE | Subcontractor |
| Cec Corporation | Oklahoma City | OK | Subcontractor |
| Cedar Corp. | Menomonie | WI | $0 |
| Cegg LLC | Renton | WA | Subcontractor |
| Celestial Computing Inc. | Chestnut Hill | MA | Subcontractor |
| Celplan Technologies, Inc. | Reston | VA | $0 |
| Censeo Av+acoustics LLC | Kailua | HI | Subcontractor |
| Censeo Insight Inc. | Seattle | WA | Subcontractor |
| Centered Consulting International, LLC | Boise | ID | $0 |
| Centerline Engineering & Consulting LLC | Lubbock | TX | Subcontractor |
| Central Asia Development Group, Inc. | Baltimore | MD | $0 |
| Central Asia Development Pacific Inc. | Subic Bay Freeport Zone | | Subcontractor |
| Centurum Inc. | Marlton | NJ | $0 |
| Centurum Information Operations Inc. | Marlton | NJ | Subcontractor |
| Centurum Information Technology, Inc.Mc Lean, VA · UEI TMXMCEA79NN4 | Mc Lean | VA | Subcontractor |
| Centurum Information Technology, Inc.San Diego, CA · UEI XVMALY4QBMW9 | San Diego | CA | $0 |
