| American Snuff Company, LLC | 940123 | 2008-10-24 | Active | Madison |
| AMERICAN SOAP COMPANY, INC. | 307636 | 1976-08-19 | — | OLIVE BRANCH |
| American Society for Clinical Pathology | 1201482 | 2020-02-12 | Active | Gulfport |
| American Society for the Advancement of Creative Expression (ASACE) | 854275 | 2004-04-16 | Active | McComb |
| AMERICAN SOCIETY FOR THE PRESERVATION OF AFFORDABLE HOUSING | 742811 | 2003-12-08 | Active | JACKSON |
| AMERICAN SOCIETY OF CLU & CHFC | 583936 | 1983-04-28 | — | JACKSON |
| American Society of Hand Therapists | 1487836 | 2025-04-30 | Active | JACKSON |
| American Society of Health-System Pharmacists, Inc. | 1439510 | 2024-04-23 | Active | Gulfport |
| American Society of Military Comptrollers MS Sound Chapter | 1435566 | 2024-03-26 | Active | Biloxi |
| AMERICAN SOCIETY OF ORAL AND MAXILLOFACIAL SURGEONS | 307637 | 1977-01-05 | Active | JACKSON |
| American Society of Power Engineers, Inc. | 852641 | 2004-02-16 | Canceled | Biloxi |
| AMERICAN SOFTWARE INNOVATIONS, INC. | 639545 | 1997-03-03 | Dissolved | — |
| American Software USA Inc | 984149 | 2011-06-03 | Dissolved | Gulfport |
| American Software USA, LLC | 1031537 | 2013-11-20 | Revoked | Gulfport |
| AMERICAN SOLAR & SECURITY FILM COMPANY, LLC | 725302 | 2002-11-15 | Dissolved | — |
| American Soldiers First, LLC | 1150233 | 2018-06-23 | Dissolved | Jackson |
| American South Financial Services, L.L.C. | 1341751 | 2022-05-24 | Active | JACKSON |
| AMERICAN SOUTH INTERNATIONAL TRADING, INC. | 618371 | 1995-05-26 | Dissolved | — |
| American South Land Company of Mississippi LLC | 1172596 | 2019-03-19 | Active | Southaven |
| American South LLC | 945860 | 2009-03-04 | Dissolved | — |
| American South Outreach Ministry & Cinemas | 1074373 | 2015-08-26 | Active | — |
| AMERICAN SOUTHEASTERN, INC. | 589605 | 1992-07-13 | Dissolved | ENTERPRISE |
| AMERICAN SOUTHERN CONSTRUCTION, LLC | 709541 | 2001-11-21 | Active | Brandon |
| American Southern Contracting, LLC | 1146616 | 2018-05-09 | Dissolved | — |
| American Southern Homes, LLC | 899072 | 2006-09-18 | Dissolved | — |
| AMERICAN SOUTHERN INSURANCE GROUP, INC. | 532275 | 1986-09-16 | Dissolved | Brandon |
| American Southern Real Estate Group, LLC | 899071 | 2006-09-18 | Dissolved | — |
| American Southern Title & Exchange, LLC | 910139 | 2007-04-06 | Dissolved | — |
| American Southwest Mortgage Corp | 1034262 | 2014-01-15 | Revoked | — |
| American Southwest Mortgage Funding Corp. | 1062591 | 2015-03-06 | Revoked | Oxford |
| AMERICAN SPA SYSTEMS, INC. | 433893 | 1972-01-07 | Dissolved | — |
| AMERICAN SPECIALISTS, INC. | 307638 | 1981-02-16 | Revoked | JACKSON |
| AMERICAN SPECIALITY, INC. | 617127 | 1995-04-26 | — | — |
| American Specialty Alloys, Inc | 1038342 | 2014-03-24 | Dissolved | Gulfport |
| AMERICAN SPECIALTY COMPANY | 433894 | 1932-07-12 | Dissolved | — |
| AMERICAN SPECIALTY CONTRACTORS, INC. | 587098 | 1992-03-25 | Revoked | Gulfport |
| AMERICAN SPECIALTY CONTRACTORS, INC. | 526143 | 1985-11-22 | Canceled | Gulfport |
| American Specialty Health Affinity, Inc. | 875319 | 2005-07-18 | Canceled | Madison |
| AMERICAN SPECIALTY HEALTH CARE, INC. | 714224 | 2002-03-12 | Canceled | Madison |
| American Specialty Health Fitness, Inc. | 1458660 | 2024-09-20 | Active | Madison |
| American Specialty Health Group, Inc. | 680851 | 1999-03-23 | Active | Madison |
| American Specialty Health Plans of California, Inc. | 1458665 | 2024-09-20 | Active | Madison |
| American Specialty Insurance & Risk Services, Inc. | 874969 | 2005-07-08 | Active | Madison |
| AMERICAN SPECIALTY NETWORKS SOUTHWEST, INC. | 668710 | 1999-03-23 | — | Gulfport |
| American Specialty Processing, LLC | 1054668 | 2014-10-31 | Dissolved | — |
| AMERICAN SPECIALTY PRODUCTS, INC. | 629483 | 1996-04-25 | Dissolved | — |
| AMERICAN SPECIALTY RETAILERS, INC. | 586168 | 1992-02-14 | Dissolved | Shopping Center Tupelo |
| AMERICAN SPECIALTY, INC. | 570856 | 1990-03-26 | Dissolved | JACKSON |
| AMERICAN SPECIALTY, INC. | 679575 | 1995-04-26 | Dissolved | Vicksburg |
| American Speedy Tax, LLC | 922073 | 2007-11-07 | Dissolved | — |