| Seeker Integrated Solutions, Inc. | Rocklin | CA | Subcontractor |
| See Resource Group LLC | Kapolei | HI | $0 |
| Sei - Cincinnati, LLC | Cincinnati | OH | Subcontractor |
| Sei - Washington D.C., LLC | Cincinnati | OH | Subcontractor |
| Sellers Dorsey & Associates LLC | Philadelphia | PA | Subcontractor |
| Semiotics Consultants (PVT) Limited | Islamabad | | $0 |
| Senan Group LLC | Flemington | NJ | $0 |
| Serna Physics Innovations LLC | Albuquerque | NM | Subcontractor |
| Sev1tech, LLC | Aberdeen | MD | Subcontractor |
| Shelley Row Associates LLC | Annapolis | MD | $0 |
| Sheppard Consulting, LLC | Washington | DC | Subcontractor |
| Shockey Consulting Services, L.L.C. | Overland Park | KS | $0 |
| Shuman Consulting Group, LLC | Skokie | IL | Subcontractor |
| Sigmariver Inc. | Front Royal | VA | Subcontractor |
| Silent Partner Services, LLC | Frederick | MD | $0 |
| Silicon Transportation Consultants LLC | Kirkland | WA | Subcontractor |
| Simatree LLC | Vienna | VA | Subcontractor |
| Simpler North America LLC | Armonk | NY | Subcontractor |
| Simpson Consulting Inc. | Owens Cross Roads | AL | Subcontractor |
| Six Sigma Professionals Inc. | Canton | MI | $0 |
| S&J Staffing LLC | Norman | OK | Subcontractor |
| Skinny Corp. | Secane | PA | $0 |
| Skylight 2020 LLC | Gainesville | VA | $0 |
| Slack Consultant | Florence | CO | $0 |
| S&M Business Advisory Group LLC | Clinton | MD | $0 |
| S.M.T Center | Amman | | Subcontractor |
| SNF Writing Solutions LLC | Greenwood | IN | $0 |
| Snowcreek Consulting LLC | Alexandria | VA | Subcontractor |
| Soar-usa LLC | Saint Peters | MO | Subcontractor |
| Sobis, Inc. | Fredericksburg | VA | Subcontractor |
| Sociometrics Inc. | Washington | DC | $0 |
| Software Premier LLC | Riverview | FL | $0 |
| Software Tech Enterprises Inc. | Frankfort | IL | Subcontractor |
| Solarize Electric LLC | Detroit | MI | $0 |
| Solera Associates LLC | Durham | NC | $0 |
| Solomonedwardsgroup LLC | Wayne | PA | $0 |
| Solutech, LLC | Leesburg | VA | Subcontractor |
| Solution 42 Ltd. LLC | Alexandria | VA | $0 |
| Sonrisa Consulting, Inc. | Woodbridge | VA | Subcontractor |
| Sorrel Associates LLC | Mc Lean | VA | Subcontractor |
| Souder Betances & Associates Inc. | Chicago | IL | $0 |
| Sound Hub Holdings Inc. | Port Townsend | WA | Subcontractor |
| South Carolina Research Authority | Columbia | SC | $0 |
| South Central Kansas Economic Development District Inc. | Wichita | KS | $0 |
| Southeast Energy Efficiency Alliance Inc. | Atlanta | GA | Subcontractor |
| Space Enterprise Consulting LLC | Madison | AL | Subcontractor |
| Spak Enterprises LLC | Tahlequah | OK | $0 |
| Spartan Consulting, LLC | Helena | MT | $0 |
| SPC Business Consulting LLC | Lexington Park | MD | $0 |
| Speire Healthcare Strategies, LLC | Nashville | TN | Subcontractor |
| Spencer Consulting | Kensington | MD | $0 |
| Spire Associates Group LLC | Stafford | VA | Subcontractor |
| Spi USA Inc. | Washington | DC | $0 |
| Sprightbulb LLC | Annapolis | MD | Subcontractor |
| Square One Consultants, Inc. | West Lake Hills | TX | $0 |
| Ssa Consultants, L.L.C. | Baton Rouge | LA | $0 |
| Ssiven JV, LLC | Centreville | VA | Subcontractor |
| Staats, Aimee | Fair Oaks | CA | $0 |
| Staley Strategic Support Services, Inc. | Indianapolis | IN | Subcontractor |
| Star Chaser Technologies, L.L.C. | Ellicott City | MD | Subcontractor |
| S.t.a.r.t., LLC | Mingo Junction | OH | $0 |
| Stedfast Solution Group, Inc. | Tappahannock | VA | Subcontractor |
| Steele Strategies, LLC | Mclean | VA | Subcontractor |
| Stelr LLC | Evergreen | CO | Subcontractor |
| Stephen Norred Consulting, LLC | Malakoff | TX | Subcontractor |
| Stern Marc F | Tumwater | WA | $0 |
| Steven H Shimotsu Cpa | Mcallen | TX | $0 |
| Steve Passin & Associates LLC | Charlotte | NC | $0 |
| Stewart Leadership, LLC | West Richland | WA | Subcontractor |
| STG, LLC | Mechanicsville | VA | Subcontractor |
| Stichting Pharmaccess International | Amsterdam | | Subcontractor |
| Stone Ridge Medical Consultants LLC | Vero Beach | FL | Subcontractor |
| Stonewater LLC | Crozet | VA | Subcontractor |
| Strategic Alliances Resources Network LLC | San Francisco | CA | $0 |
| Strategically Mindful LLC | Bethesda | MD | Subcontractor |
| Strategic Bpo Solutions LLC | Chicago | IL | Subcontractor |
| Strategic Enterprise Technology, Inc. | Boston | MA | $0 |
| Strategic Insights, Inc. | Cedar Rapids | IA | $0 |
| Strategy Arts, LLC | West Chester | PA | Subcontractor |
| Strategy Bridge International, Inc. | Leesburg | VA | Subcontractor |
| Strategy Solutions Inc. | Erie | PA | Subcontractor |
| Stratgeo LLC | Castle Rock | CO | Subcontractor |
| Strativus Group LLC | Signal Mountain | TN | Subcontractor |
| Stroudwater Associates | Portland | ME | $0 |
| Success Staging International, LLC | Martinez | GA | Subcontractor |
| Summit Defense LLC | Dubois | WY | Subcontractor |
| Summit View Solutions, Inc. | Falls Church | VA | Subcontractor |
| Suss Consulting, Inc. | Jenkintown | PA | $0 |
| Sustainable Horizons Institute | Palm Desert | CA | Subcontractor |
| SVD Solutions LLC | Richmond | VA | Subcontractor |
| SW Associates LLC | Washington | DC | Subcontractor |
| Syimple Transformations, Inc. | San Diego | CA | Subcontractor |
| Synaptic, L.L.C | Yorktown | VA | $0 |
| Synergy Development Limited | Calumet City | IL | $0 |
| Systematic Medical Billing & Credentialing Services, Inc. | Port Jefferson Station | NY | Subcontractor |
| Systemize Corporation | Lusby | MD | Subcontractor |
| Systems Maintenance & Technology, Inc. | Waldorf | MD | $0 |
| System Technical Management Group, LLC | Leonardtown | MD | Subcontractor |
| T3cy Business Solutions, LLC. | San Diego | CA | Subcontractor |
| T3 Solutions LLC | Yonkers | NY | Subcontractor |
