| Management & Training Resources, LLC | Denver | CO | Subcontractor |
| Managenet Inc. | Ashburn | VA | Subcontractor |
| Mantaro Networks, Inc. | Germantown | MD | Subcontractor |
| Mantech Advanced Systems International Inc. | Lexington Park | MD | Subcontractor |
| Mantech Advanced Systems International, Inc. | North Charleston | SC | Subcontractor |
| Mantenimientos Y Servicios Electronicos, S.a. De C.v. | San Salvador | | $0 |
| Marietta Scientific, Inc. | Marietta | GA | Subcontractor |
| Marine Solutions International LLC | Cape May | NJ | Subcontractor |
| Maritime Design, Inc. | Atlantic Beach | FL | Subcontractor |
| Maritime Mobile Communications LLC | Miramar | FL | Subcontractor |
| Mark India LLC | Potomac Falls | VA | Subcontractor |
| Mark Thomas And Associates, Inc. | Escondido | CA | Subcontractor |
| Mark V Inc. | Hurricane | WV | $0 |
| Marrs Services, Inc. | Fullerton | CA | Subcontractor |
| Marshall Engineering Corporation | Humble | TX | $0 |
| Martek Cybersecurity Solutions, LLC | Bowie | MD | Subcontractor |
| Martin, Chock & Carden Inc. | Honolulu | HI | Subcontractor |
| Martin Engineering, Incorporated | Fairbanks | AK | Subcontractor |
| Martinez Moore Engineers, LLC | Austin | TX | Subcontractor |
| Martin R Button | Austin | TX | Subcontractor |
| Mary L Denz | Leland | NC | Subcontractor |
| Master Consulting Engineers, Inc. | Tampa | FL | $0 |
| Material Handling Equipment, Inc. | Clearwater Beach | FL | Subcontractor |
| Materials & Mechanics LLC | Mesa | AZ | Subcontractor |
| Materials Testing Consultants Inc. | Grand Rapids | MI | Subcontractor |
| Matern Professional Engineering, Inc. | Maitland | FL | Subcontractor |
| Matrix Cad Design Inc. | Denver | NC | Subcontractor |
| Matrix Hvac, LLC | Mandeville | LA | $0 |
| Matrix Service Inc. | Tulsa | OK | Subcontractor |
| Matrix X LLC | Bradenton | FL | Subcontractor |
| Maurer-stutz Inc. | Peoria | IL | Subcontractor |
| Maverick Aerospace, LLC | Denton | TX | Subcontractor |
| Maverick Development Corporation | Woodstock | MD | Subcontractor |
| Maxim Engineering, Inc. | Coeburn | VA | $0 |
| Mayes Testing Engineers, Inc. | Lynnwood | WA | Subcontractor |
| Mazzetti, Inc. | San Francisco | CA | $0 |
| M & B Engineering, Inc. | Galveston | TX | Subcontractor |
| Mb Infrastructure | Lakewood | CO | Subcontractor |
| MBN Engineering, Inc. | Fargo | ND | $0 |
| Mbran Research LLC | Edison | NJ | Subcontractor |
| Mcade, LLC | Oklahoma City | OK | $0 |
| Mcclanahan Inc. | Lake Forest | CA | Subcontractor |
| Mcclure Corp. | Saint Louis | MO | Subcontractor |
| Mcclure Engineering Co. LLC | Ankeny | IA | Subcontractor |
| Mccomas Civil Design PLLC | Dulles | VA | Subcontractor |
| Mccrory & Williams, Inc. | Mobile | AL | $0 |
| Mcdonald Aerospace LLC | San Luis Obispo | CA | Subcontractor |
| Mcdowell And Associates, Inc. | Ferndale | MI | $0 |
| Mcfarland-johnson, Inc. | Binghamton | NY | Subcontractor |
| Mcgiffert & Associates LLC | Tuscaloosa | AL | $0 |
| Mchale & Associates, Inc. | Redmond | WA | $0 |
| MCH Consulting, Inc. | Pinehurst | NC | Subcontractor |
| Mcmahon & Mann Consulting Engineering And Geology, P.C. | Buffalo | NY | Subcontractor |
| Mcmann Harold J | Katy | TX | Subcontractor |
| Mc Millen Engineering Inc. | Uniontown | PA | $0 |
| Mcpherson Consulting LLC | Virginia Beach | VA | Subcontractor |
| Mcpherson Design Group, Inc. | Virginia Beach | VA | $0 |
| Md Acoustics LLC | Gilbert | AZ | $0 |
| MDD Engineering LLC | Washington | DC | Subcontractor |
| MDP Engineering Group, P.C. | Denver | CO | $0 |
| Measurement Analysis Corporation | Torrance | CA | Subcontractor |
| Mechanical Design Solutions, Inc. | Stuart | FL | Subcontractor |
| Meco Engineering Company Inc. | Hannibal | MO | $0 |
| Mediadyne LLC | Great Falls | VA | Subcontractor |
| Meier Enterprises, Inc. | Kennewick | WA | Subcontractor |
| Melhcorp LLC | Slidell | LA | Subcontractor |
| Melvyn Green & Associates, Inc. | Torrance | CA | $0 |
| Me Moore Consulting LLC | Aldie | VA | Subcontractor |
| Mep Commissioning Inc. | Golden | CO | Subcontractor |
| Mep Consulting Engineers Inc. | Irving | TX | Subcontractor |
| Mercado Consultants, Inc. | Ashton | MD | Subcontractor |
| Mercer Electric Consulting LLC | Columbia | MD | Subcontractor |
| Mercier & Perry, LLC | Hollis | NH | Subcontractor |
| Mercury Solutions, Inc. | Woodbridge | VA | Subcontractor |
| Meridian Msi LLC | Brunswick | ME | Subcontractor |
| Merrill Trusted Solutions Inc. | San Diego | CA | Subcontractor |
| Mesa Associates Inc.Madison, AL · UEI LA72ESMWSV41 | Madison | AL | Subcontractor |
| Mesa Associates Inc.Knoxville, TN · UEI WVBFG5HHDJ78 | Knoxville | TN | Subcontractor |
| Metalcasting Design, LLC | Charleston | SC | Subcontractor |
| Metallurgical And Materials Technologies, Inc. | Baton Rouge | LA | $0 |
| Metatech Consulting Incorporated | Odenton | MD | Subcontractor |
| Metateq, Inc. | Monument | CO | Subcontractor |
| Metrocorp Development Enterprises, Inc. | Douglasville | GA | $0 |
| Metro Metrology Corporation | Ocean View | NJ | Subcontractor |
| Metron Aviation Inc. | Middleburg | VA | Subcontractor |
| Meyer, Meyer, Lacroix & Hixson, Inc. | Alexandria | LA | $0 |
| MFS Consulting Engineers & Surveyor, D.P.C. | South Plainfield | NJ | Subcontractor |
| MGV Geotechnical Group PSC | Vega Baja | PR | Subcontractor |
| Mhe Engineering DPC | New Windsor | NY | Subcontractor |
| M-H-M, Inc. | Marysville | CA | Subcontractor |
| Mh Professional Engineering, PLLC | Rexford | NY | Subcontractor |
| Mi Casa Software, LLC | San Diego | CA | Subcontractor |
| Michael Baker Engineering Inc. | New York | NY | Subcontractor |
| Michael Baker Engineering, Inc. | Cary | NC | $0 |
| Michael Baker International Holdco Corporation | Moon Township | PA | Subcontractor |
| Michael Baker International Inc. | Tampa | FL | Subcontractor |
| Michael Baker International, Inc.San Diego, CA · UEI CZ1BJA8RHJ11 | San Diego | CA | Subcontractor |
| Michael Baker International, Inc.Pennington, NJ · UEI HCNNY2YNG3T7 | Pennington | NJ | $0 |
| Michael Baker International, Inc.Ocean Springs, MS · UEI J8G2CTH3MGD6 | Ocean Springs | MS | Subcontractor |
| Michael Baker International, Inc.Fort Washington, PA · UEI KKL5AATG5JN7 | Fort Washington | PA | $0 |
