| Aspiryon LLC | 3 | $2.3M | Department of the Army |
| Asplundh Tree Expert LLC | 12 | $7.4M | MTA Procurements |
| Asr International Corp. | 32 | $52M | Department of the Navy |
| ASRC Builders LLC | 10 | $63M | Department of the Army |
| ASRC Communications, Ltd. | 237 | $799M | Department of the Air Force |
| ASRC Earthworks, LLC | 32 | $71M | Department of the Air Force |
| ASRC Federal Advanced Research, LLC | 59 | $43M | Department of the Army |
| ASRC Federal Cyber, LLC | 17 | $125M | Department of the Navy |
| ASRC Federal Data Network Technologies, LLC | 3 | $134M | Departmental Offices |
| ASRC Federal Data Networx, LLC | 6 | $12M | Rural Housing Service |
| ASRC Federal Data Solutions, LLC | 6 | $6.2M | Department of the Air Force |
| ASRC Federal Facilities Logistics, LLC | 10,047 | $173M | Defense Logistics Agency |
| ASRC Federal Professional Services, LLC | 62 | $206M | Department of the Army |
| ASRC Federal System Solutions LLC | 17 | $482M | Department of the Air Force |
| ASRC Federal Technology Solutions, LLC | 25 | $213M | Department of the Army |
| ASRC Prime Constructors, LLC | 5 | $46M | Department of the Army |
| Asrt, Inc. | 13 | $16M | Centers for Disease Control and Prevention |
| Assa Abloy Entrance Systems US Inc. | 14 | $4.4M | Department of the Army |
| Assa Abloy Global Solutions Japan Co., Ltd. | 3 | $1.7M | Department of the Navy |
| Assa Abloy Specialty Doors, LLC | 4 | $95K | Department of State |
| Assay Technology Inc | 17 | $281K | Department of the Navy |
| Assemble Insurance Tanzania Limited | 4 | $2.9M | Department of State |
| Assent Advisory Group LLC | 5 | $16M | Department of the Navy |
| Asset Group Inc | 3 | $3.0M | Federal Emergency Management Agency |
| Asset Protection & Security Services, L.p. | 3 | $116M | U.S. Immigration and Customs Enforcement |
| Assets Inc. | 4 | $31M | Department of the Air Force |
| Assetworks Inc | 15 | $13M | New York City |
| AssetWorks USA, Inc. | 4 | $366K | Texas DIR |
| Assisted Transportation Corp | 3 | $12M | Department of Veterans Affairs |
| Assisted Transportation Services Inc | 4 | $3.2M | Department of Veterans Affairs |
| Assoc. Air Cond. & Appliances, Inc | 53 | $7K | City of Mesquite |
| Associated Aircraft Manufacturing & Sales, Inc. | 43 | $16M | Defense Logistics Agency |
| Associated Aircraft Supply Co. LLC | 95 | $853K | Defense Logistics Agency |
| Associated Boiler Line Equipment Co., Inc. | 9 | $1.2M | NY State Authorities |
| Associated Builders, Inc. | 32 | $113M | Smithsonian Institution |
| Associated Couriers, LLC | 4 | $1.2M | Department of Veterans Affairs |
| Associated Energy Group LLC | 43 | $1.8M | Defense Logistics Agency |
| Associated Fire Protection | 12 | $14M | MTA Procurements |
| Associated Health Professionals, Inc. | 3 | $5.4M | Department of Veterans Affairs |
| Associated Milk Producers Inc | 125 | $370M | Agricultural Marketing Service |
| Associated Office Systems | 39 | $823K | City-Parish of Baton Rouge |
| Associated Production Music LLC | 3 | $275K | New York City |
| Associated Rail Products LLC | 8 | $816K | MTA Procurements |
| Associated Scientists at Woods Hole, Inc. | 3 | $191K | Department of the Army |
| Associated Supply Co Inc | 142 | $1.2M | City of Mesquite |
| Associated Underwater Services, Inc. | 4 | $197K | Department of the Army |
| Associated Veterans, LLC - Quality Solutions | 3 | $944K | Departmental Offices |
| Associates International Inc | 11 | $11K | State of Delaware |
| Associates of Glens Falls | 4 | $425K | NY State Authorities |
| Association for Career and Technical Education, Inc. | 3 | $109K | Department of the Army |
| Association for Clinical Pastoral Education Inc | 4 | $65K | Department of Veterans Affairs |
| Association for Computing Machinery, Inc. | 3 | $476K | Department of the Navy |
| Association for Facilities Engineering | 3 | $144K | Department of State |
| Association for Vision Rehabilitation and Employment, Inc | 7 | $4.1M | Defense Logistics Agency |
| Association Gide Loyrette Nouel | 5 | $364K | Department of State |
| Association House of Chicago | 6 | $2.0M | City of Chicago |
| Association of Black Social Workers | 3 | $3.4M | New York City |
| Association of Certified Anti-Money Laundering Specialists, LLC | 3 | $425K | Internal Revenue Service |
| Association of Certified Fraud Examiners, Inc. | 10 | $596K | Department of Veterans Affairs |
| Association of Community Action | 6 | $7K | City-Parish of Baton Rouge |
| Association of Consultants and Engineers | 38 | $16M | Department of the Navy |
| Association of Government Accountants (AGA) Portland Chapter | 6 | $675 | Oregon State Treasury |
| The Association of Metropolitan Water Agencies | 5 | $222K | New York City |
| Association of Military Surgeons of the United States, Inc. | 3 | $3.0M | Defense Health Agency |
| Association of Operating Room Nurses, Inc. | 3 | $84K | Department of the Air Force |
| Association of Public Health Laboratories, Inc. (the) | 6 | $3.6M | Department of Veterans Affairs |
| The Association of the United States Army | 8 | $437K | Department of the Army |
| The Association of University Physicians | 6 | $1.6M | Department of Veterans Affairs |
| Association to Benefit Children | 3 | $17M | New York City |
| Assurance Technology Corp | 8 | $662M | Department of the Navy |
| Assurances Generales Du Cameroune S.a | 9 | $446K | Department of State |
| Assurances Maghrebia SA | 18 | $1.7M | Department of State |
| Assured Bio Labs, LLC | 3 | $66K | Department of Veterans Affairs |
| Assured Document Destruction, Inc. | 3 | $660K | Social Security Administration |
| Assured Imaging, LLC | 3 | $170K | Indian Health Service |
| Assured Imaging Womens Wellness of Southern Arizona LLC | 7 | $1.7M | Indian Health Service |
| Assured Information Security, Inc. | 28 | $504M | Department of the Air Force |
| Assured Plant Services Inc | 47 | $6.1M | Department of the Navy |
| Assurgent Medical Staffing LLC | 5 | $8.7M | Department of Veterans Affairs |
| Assuria General (Gy) Inc. | 4 | $2.1M | Department of State |
| Assyst Inc. | 12 | $12M | Department of the Army |
| Ast Associates Inc | 58 | $130K | Defense Logistics Agency |
| Astarita Associates, Inc. | 7 | $2.2M | Department of Veterans Affairs |
| Astaroth Desarrollos SL | 11 | $198K | Department of the Navy |
| Astbury Water Technology Inc | 9 | $94K | Federal Prison System / Bureau of Prisons |
| Astertech LLC | 3 | $1.5M | Department of the Navy |
| Astin Aviation CLL LLC | 16 | $9K | Defense Logistics Agency |
| Astor Services for Children & Families | 4 | $25M | New York City |
| Astoria-Pacific, Inc. | 3 | $231K | U.S. Geological Survey |
| Astoria Scuba and Adventure Sports, LLC | 5 | $0 | Defense Logistics Agency |
| Astra Products Co., Inc. of Tampa | 10 | $2.0M | Defense Logistics Agency |
| Astraeus Operations, LLC | 7 | $3.6M | Department of the Navy |
| Astral Air Parts LLC | 19 | $164K | Defense Logistics Agency |
| Astrallic Inc. | 3 | $133K | Department of the Army |
| Astrea General Trading | 34 | $4.4M | Department of the Air Force |
| Astrea Group for Trading and Contracting | 27 | $9.8M | Department of the Air Force |
| Astrea Project Management & Trading Services | 27 | $10M | Department of the Air Force |
| Astrea Technical Services LLC | 10 | $6.1M | Department of the Air Force |
| Astrion Group, LLC | 8 | $483M | Department of the Air Force |
| Astrix Technology LLC | 182 | $61M | National Institutes of Health |