| Rhine-cross Group, LLC | Klamath Falls | OR | Subcontractor |
| Rhombic Systems Inc. | Washington Crossing | PA | Subcontractor |
| Rhyton Technologies LLC | Bloomingdale | GA | Subcontractor |
| Richard Lee Culver | San Diego | CA | Subcontractor |
| Ricky Lee Roberts | Saint Charles | MO | Subcontractor |
| Ridenour, David | Beaver | PA | $0 |
| Rig Fab Educational Services LLC | Tampa | FL | Subcontractor |
| Riley Engineering, LLC | Tucson | AZ | Subcontractor |
| Rim Architects Coffman Engineers JV | Anchorage | AK | Subcontractor |
| Rim Architects, LLC | Anchorage | AK | Subcontractor |
| Ring & Duchateau, LLP | Brookfield | WI | $0 |
| Rinker Design Associates, LLC | Manassas | VA | $0 |
| Rio Ase LLC | Boise | ID | Subcontractor |
| Rivera Halcrow Engineering LLC | North Las Vegas | NV | Subcontractor |
| River City Geoprofessionals, Inc. | West Sacramento | CA | Subcontractor |
| River Research & Design Inc. | Mountain Home | ID | $0 |
| Rivers & Associates, Inc. | Greenville | NC | Subcontractor |
| River Valley Wireless LLC | West Lafayette | IN | $0 |
| Rizza Engineering, Inc. | Poway | CA | Subcontractor |
| RJS Consulting, L.L.C. | Huntingtown | MD | Subcontractor |
| Rj Vincent Enterprises LLC | Rancho Santa Fe | CA | $0 |
| R K A, Inc. | Orlando | FL | Subcontractor |
| Rl Goodworks LLC | Upper Marlboro | MD | Subcontractor |
| Rma Geoscience, Inc. | Sun Valley | CA | Subcontractor |
| R M H Group Inc. The | Lakewood | CO | Subcontractor |
| RML Acoustics LLC | Alachua | FL | Subcontractor |
| RMS Aerospace, LLC | Mineral Wells | TX | $0 |
| R Myers Consulting LLC | Woodinville | WA | $0 |
| RNP Engineering Inc. | Beavercreek | OH | Subcontractor |
| Robert Bosch LLC | Oakbrook Terrace | IL | Subcontractor |
| Robert Engineering Group PSC | Guaynabo | PR | Subcontractor |
| Robert L. Seymour & Associates, Inc. | Frederick | MD | Subcontractor |
| Robert Silman Associates, PLLC | Washington | DC | Subcontractor |
| Robo Nautica, LLC | San Luis Obispo | CA | $0 |
| Roca Engineering Inc. | Oklahoma City | OK | Subcontractor |
| Rochester & Associates, LLC | Gainesville | GA | Subcontractor |
| Rockwell Collins Simulation & Training Solutions LLCBinghamton, NY · UEI K8JUDLK5DFA5 | Binghamton | NY | $0 |
| Rockwell Collins Simulation & Training Solutions LLCOrlando, FL · UEI M5DGPW51FKV7 | Orlando | FL | Subcontractor |
| Rockwell Collins Simulation & Training Solutions, LLC | Sterling | VA | Subcontractor |
| Rockwell Collins Uk Limited | Burgess Hill | | Subcontractor |
| Rodriguez Consulting LLC | Philadelphia | PA | $0 |
| Rogue 10 Labs Inc. | Rome | NY | Subcontractor |
| Rohadfox Construction Control Services Corporation | Atlanta | GA | Subcontractor |
| Rollout Systems LLC | California | MD | Subcontractor |
| Romeo Engineering Incorporated | Fort Worth | TX | $0 |
| Ronald N. S. Ho & Associates, Inc. | Honolulu | HI | Subcontractor |
| Roof Spec Inc. | Saint Paul | MN | Subcontractor |
| Rotor Bearing Analysis, LLC | Charlottesville | VA | $0 |
| Roush Enterprises, Inc. | Livonia | MI | Subcontractor |
| Roush Industries, Inc. | Livonia | MI | Subcontractor |
| Rowe Professional Services Co. | Flint | MI | Subcontractor |
| Royal Consulting Services, Inc. | Longwood | FL | $0 |
| Royal Engineers And Consultants, LLC | New Orleans | LA | Subcontractor |
| R & R Engineers & Surveyors Inc. | Denver | CO | Subcontractor |
| R & R System Solutions, LLC | Sterling | VA | $0 |
| Rs&h-cems JV | Jacksonville | FL | $0 |
| R S Scott Associates Inc. | Alpena | MI | $0 |
| R. Tech LLC | Henrico | VA | Subcontractor |
| Rubicon Engineering Corporation | Orange | CA | $0 |
| Rubinos And Mesia Engineers, Inc. | Chicago | IL | Subcontractor |
| Ruda Optical Inc. | Tucson | AZ | Subcontractor |
| Ruen-yeager & Associates, Inc. P.a | Coeur D Alene | ID | Subcontractor |
| Rummel, Klepper & Kahl, LLP | Baltimore | MD | Subcontractor |
| Runemaster, LLC | Crofton | MD | $0 |
| Rustin, LLC | Laguna Niguel | CA | Subcontractor |
| R & W Engineering, Inc. | Beaverton | OR | $0 |
| R. W. Gillespie & Associates, Inc. | Biddeford | ME | Subcontractor |
| Ryan Biggs Clark Davis Engineering, D.P.C. | Clifton Park | NY | $0 |
| Ryan Engineering, Inc. | Siloam Springs | AR | $0 |
| Rz Design Associates, Inc. | Rocky Hill | CT | Subcontractor |
| Sabre Engineering Inc. | Columbia | MD | Subcontractor |
| Sabre Solar, LLC | Mount Airy | MD | $0 |
| Sacramento Engineering Consultants, Inc. | Sacramento | CA | Subcontractor |
| Saddle Butte Systems LLC | Kirkland | WA | Subcontractor |
| Saec/kinetic Vision, Inc. | Cincinnati | OH | $0 |
| Saf Consulting LLC | Great Falls | VA | Subcontractor |
| Safe Sense Technologies, L.L.C. | Portage | MI | $0 |
| Safety Net Solutions, Inc. | Fishkill | NY | Subcontractor |
| Safety Through Engineering Inc. | New Carlisle | OH | $0 |
| Safran Electrical & Power USA, LLC | Everett | WA | Subcontractor |
| Sage Engineering Associates, LLP | Albany | NY | Subcontractor |
| Sageguild, LLC | Stafford | VA | Subcontractor |
| Saicon Consultants Inc. | Overland Park | KS | Subcontractor |
| Sai Engineering Incorporated | Woodbridge | VA | $0 |
| Sain Associates Inc. | Birmingham | AL | Subcontractor |
| Salamis Solutions LLC | Haymarket | VA | Subcontractor |
| Salas O'brien Engineers, Inc. | San Jose | CA | Subcontractor |
| Salient Solutions Incorporated | Grapeland | TX | Subcontractor |
| Salo Engineering L.L.C. | San Juan | PR | $0 |
| Sam-construction Services, LLC | Austin | TX | Subcontractor |
| Sam, Inc. | College Park | MD | Subcontractor |
| Sampa Kogyo K.k. | Yokohama | | Subcontractor |
| Samuel Engineering, Inc. | Greenwood Village | CO | Subcontractor |
| Sandalwood Enterprises LP | Livonia | MI | Subcontractor |
| San Dieguito Engineering Inc. | Carlsbad | CA | Subcontractor |
| Sandis Civil Engineers Surveyors Planners | Oakland | CA | Subcontractor |
| Saq Consulting Ltd. | Callao | VA | Subcontractor |
| Sarakki Associates Inc. | Irvine | CA | Subcontractor |
| Satish Kandlikar | Rochester | NY | $0 |
| Satlink US, LLC | Rehoboth Beach | DE | $0 |
