| Rockin B Ranch LLC | Pocatello | ID | Subcontractor |
| Rockwell Laser Industries, Inc. | Cincinnati | OH | Subcontractor |
| Rogue Engineers, Analysts, And Logisticians Incorporated | Fairfax | VA | Subcontractor |
| Ron Dieck Associates, Inc. | Palm Beach Gardens | FL | $0 |
| Rosemary Walzem | College Station | TX | $0 |
| Rosko, Michael E | Traverse City | MI | $0 |
| Rotary Power LLC | Northport | NY | $0 |
| Rt Solutions Inc. | Cambridge | MA | Subcontractor |
| Rty LLC | Scarborough | ME | $0 |
| Rubes Consulting PLLC | Tucson | AZ | $0 |
| Ruxton Advisors LLC | East Aurora | NY | Subcontractor |
| Ryan Arner Science Consulting LLC | Freeport | PA | Subcontractor |
| Safety & Environmental Associates, Inc. | Little Rock | AR | $0 |
| Safety Health And Environmental Consulting LLC | Tucson | AZ | Subcontractor |
| Safety Management And Related Training, Inc. | San Diego | CA | Subcontractor |
| Safety Management Systems LLC | Biddeford | ME | $0 |
| Safety Solution Consultants, Inc. | East Granby | CT | $0 |
| Safex Inc. | Westerville | OH | $0 |
| Sagecrow LLC | Tampa | FL | Subcontractor |
| Sage Solutions Group, Inc. | Homer Glen | IL | Subcontractor |
| Sahana Technology LLC | Bridgewater | NJ | Subcontractor |
| San Diego Medical Examiner | San Diego | CA | $0 |
| Sandra A Almeida Md LLC | Jacksonville | FL | Subcontractor |
| Sara Marie Westrick Schomig | Annapolis | MD | Subcontractor |
| Scango Services LLC | Denver | CO | $0 |
| Scarfone Cybersecurity | Clifton | VA | Subcontractor |
| Sciencebetter Consulting LLC | New York | NY | Subcontractor |
| Science Of P/cve LLC, The | Acworth | GA | Subcontractor |
| Sciligent, LLC | Alexandria | VA | Subcontractor |
| Scilore LLC | Mcdade | TX | Subcontractor |
| Scilytx LLC | Centreville | VA | Subcontractor |
| Scimentis LLC | Statham | GA | Subcontractor |
| Scitech Strategies Inc. | Wayne | PA | $0 |
| S&D Consulting Services LLC | Raleigh | NC | Subcontractor |
| Sea Level Consulting, LLC | Sitka | AK | $0 |
| Secorp Industries | Lafayette | LA | Subcontractor |
| Security By Design, Inc. | Pacheco | CA | Subcontractor |
| Security Compliance Solutions, LLC | Lexington | SC | Subcontractor |
| Security Concepts And Strategic Design LLC | Niceville | FL | Subcontractor |
| Seidel Jurgen | Bethesda | MD | Subcontractor |
| Semi Tech Associates LLC | Copperopolis | CA | Subcontractor |
| Setracon, Inc. | Tacoma | WA | $0 |
| Shenandoah Mission Essential Services LLC | Charlottesville | VA | Subcontractor |
| Shepard & Associates, LLC | Newberg | OR | $0 |
| Sher Lawrence | Albuquerque | NM | Subcontractor |
| Show Me Quality Consulting, LLC | Columbia | MO | Subcontractor |
| SHS Solutions LLC | Hazlet | NJ | $0 |
| Sidwell Enterprises Inc. | Bear | DE | Subcontractor |
| Siebein Associates, Inc. | Gainesville | FL | $0 |
| Sieber Martin | Mount Horeb | WI | $0 |
| Siegel Michele J | New York | NY | $0 |
| Sierra 1 Security Issues Consulting, L.L.C. | Fort Washington | MD | $0 |
| Sightline, Inc. | Warrenton | VA | Subcontractor |
| Simplex LLC | Leesburg | VA | Subcontractor |
| Sirom Scientific Solutions LLC | West Orange | NJ | $0 |
| Situs Ergonomics, LLC | Anchorage | AK | $0 |
| Siva Corrosion Services Inc. | West Chester | PA | Subcontractor |
| Skans Consulting, Inc. | Bay Shore | NY | Subcontractor |
| SKJ Consulting Inc. | Grand Junction | CO | Subcontractor |
| Small Planet Works, Inc. | Memphis | TN | $0 |
| Smith-comeskey Ground Water Science, Limited Liability Company | Bluffton | OH | $0 |
| Smith & Fisher ,LLC. | Woodbridge | VA | $0 |
| SN3RD LLC | Washington | DC | Subcontractor |
| Snider, Bert W | Lake Elmo | MN | $0 |
| Snifco LLC | Castle Pines | CO | Subcontractor |
| Social Security Administration | Baltimore | MD | Subcontractor |
| Sophia Solutions LLC | Durham | NC | Subcontractor |
| Source Clean Energy LLC | Denver | CO | Subcontractor |
| Southern Ag Services Inc. | Starkville | MS | $0 |
| Southern Appalachian Technical Services, LLC | Clarkesville | GA | $0 |
| Southern Ohio Diversification Initiative | Piketon | OH | Subcontractor |
| Southface Energy Institute, Inc. | Atlanta | GA | $0 |
| Southpoint Solutions LLC | Fort Mill | SC | Subcontractor |
| Southwest Mission Acceleration Center | Phoenix | AZ | Subcontractor |
| Southwest Native Consultants, LLC | Albuquerque | NM | $0 |
| Southwest Roofing Consulting Services, Inc. | Phoenix | AZ | Subcontractor |
| Sparrowhawk Consulting LLC | Lancaster | PA | Subcontractor |
| Spatial And Spectral Research, L.L.C. | Mckinney | TX | $0 |
| Spatial Informatics Group Natural Assets Laboratory | Pleasanton | CA | Subcontractor |
| Spectragen Informatics, LLC | Bainbridge Island | WA | $0 |
| Spectrum Advocates LLC | Richmond | VA | Subcontractor |
| Spectrum, Inc. | Oak Ridge | TN | Subcontractor |
| Spence Michael | El Paso | TX | $0 |
| Spin Solutions, Ltd. | Colorado Springs | CO | Subcontractor |
| Spotlight Inc. | Littleton | CO | Subcontractor |
| S&P Systems L.L.C. | Colorado Springs | CO | Subcontractor |
| Standing Stone Consulting, Inc. | Huntingdon | PA | $0 |
| Station Hypo Prime LLC | Honolulu | HI | Subcontractor |
| Stat Tech Inc. | Alexandria | VA | $0 |
| STC Incorporated | Colorado Springs | CO | Subcontractor |
| Steffens Wayne P | Two Harbors | MN | $0 |
| Stellarpeak Corp. | Reston | VA | Subcontractor |
| Stem Integration Services LLC | Mckinney | TX | Subcontractor |
| Steve W. J. Kozlowski, PH.D. | Lutz | FL | $0 |
| Stichting Koninklijk Nederlands Lucht- En Ruimtevaartcentrum | Amsterdam | | Subcontractor |
| Stiger Consulting Group Inc. | Arlington | VA | Subcontractor |
| Stockmanship Journal, LLC | Cascade | MT | $0 |
| Storm King Analytics, LLC | Beacon | NY | Subcontractor |
| Strategic Contractual Solutions LLC | Watervliet | NY | Subcontractor |
| Strategic Economics Inc. | Berkeley | CA | Subcontractor |
