| Advanced Metals, LLC | 1142276 | 2018-04-01 | Active | NEW ALBANY |
| Advanced Metering Installations LLC | 1536779 | 2026-03-18 | Active | JACKSON |
| Advanced Micro Devices, Inc. | 986539 | 2011-07-22 | Active | Gulfport |
| ADVANCED MICRO TECHNOLOGIES, INC. | 652886 | 1998-02-16 | Active | NATCHEZ |
| ADVANCED MICRO, L.L.C. | 721935 | 2002-08-28 | Active | OLIVE BRANCH |
| Advanced Micro-Electronics Inc | 997397 | 2012-03-08 | Dissolved | Gulfport |
| Advanced Microbial Solutions LLC | 1381193 | 2023-03-01 | Active | Madison |
| ADVANCED MICROSYSTEMS INC | 663498 | 1998-11-16 | Active | RIDGELAND |
| Advanced Mobile Home & RV Supply LLC | 995272 | 2012-02-03 | Active | Gulfport |
| Advanced Mobile Home Supply, LLC | 894256 | 2006-06-22 | Withdrawn | Conway |
| Advanced Modular Homes & Developments, LLC | 904499 | 2007-01-03 | Dissolved | — |
| Advanced Moisture Technologies, LLC | 917772 | 2007-08-20 | Dissolved | — |
| Advanced Mold Professionals, LLC | 962127 | 2010-02-22 | Active | Lake |
| Advanced Monitored Caregiving, Inc. | 1479524 | 2025-03-06 | Active | Oxford |
| Advanced Monitoring Services, Inc. | 990141 | 2011-10-07 | Active | Gulfport |
| ADVANCED MONITORING SYSTEMS, INC. | 670097 | 1999-04-27 | Dissolved | — |
| ADVANCED MORTGAGE ASSOCIATES, LLC | 676872 | 1999-10-04 | Dissolved | — |
| ADVANCED MORTGAGE COMPANY, INC. | 718140 | 2002-06-05 | Dissolved | — |
| Advanced Mortgage LLC | 862299 | 2004-10-13 | Dissolved | Flowood |
| ADVANCED MORTGAGE SERVICES, INC. | 551433 | 1988-02-24 | Dissolved | JACKSON |
| Advanced Mortgage Systems, Inc. | 918515 | 2007-08-31 | Dissolved | Lexington |
| Advanced Mosquito Control & Technology, Inc. | 886592 | 2006-02-13 | Active | Boyle |
| Advanced Mosquito Control, Inc. | 1218578 | 2020-06-23 | Active | Boyle |
| Advanced Motor Credit LLC | 1514703 | 2025-10-29 | Active | Flowood |
| ADVANCED NATIONAL SOLUTIONS LLC | 1537302 | 2026-03-20 | Active | JACKSON |
| Advanced National Transport LLC | 1176784 | 2019-05-01 | Dissolved | Collinsville |
| ADVANCED NATIONWIDE MESSAGING CORPORATION | 612549 | 1994-11-18 | Revoked | Madison |
| Advanced Neuropsych, LLC | 1016714 | 2013-03-01 | Dissolved | — |
| Advanced Neurotherapy, LLC | 1535406 | 2026-03-10 | Active | Madison |
| ADVANCED NURSING, INC. | 577553 | 1991-01-10 | Dissolved | MCCOMB |
| Advanced Nutrients US LLC | 997359 | 2012-03-08 | Active | Madison |
| Advanced Nutrition LLC | 1322070 | 2022-03-31 | Dissolved | Brandon |
| ADVANCED NUTRITIONAL CONCEPTS, LLC | 705649 | 2001-08-13 | Active | Canton |
| ADVANCED OBSTETRICS AND GYNECOLOGY, P.C. | 723013 | 2002-09-23 | Active | NEW ALBANY |
| Advanced Office Solutions, LLC | 924324 | 2007-12-21 | Dissolved | — |
| ADVANCED ORTHOPEDIC ASSOCIATES, P.C. | 672093 | 1999-06-14 | Active | Madison |
| Advanced Outdoor Solutions LLC | 1238213 | 2020-08-26 | Revoked | Biloxi |
| Advanced Outdoor Solutions, LLC | 1320273 | 2022-02-15 | Active | Brandon |
| Advanced Outdoor Solutions, LLC | 1099714 | 2016-08-22 | Dissolved | — |
| ADVANCED OXYGEN THERAPY INC. | 1536015 | 2026-03-13 | Active | JACKSON |
| ADVANCED PAIN CARE CLINIC, P.S.C. | 1493713 | 2025-06-11 | Active | JACKSON |
| Advanced Pain Relief Center LLC | 1345910 | 2022-06-22 | Active | Bogue Chitto |
| Advanced Pain Therapy, PLLC | 875877 | 2005-07-28 | Dissolved | — |
| ADVANCED PAINTING, INC. | 647732 | 1997-10-06 | Dissolved | — |
| ADVANCED PATHOLOGY SOLUTIONS, PLLC | 1408730 | 2023-08-28 | Active | Gulfport |
| Advanced patrol techniques APT, LLC | 1062746 | 2015-03-09 | Active | Gulfport |
| Advanced PEO Solutions II LLC | 1034276 | 2014-01-15 | Withdrawn | Lakeland |
| ADVANCED PERFORMANCE TIRE & MUFFLER, INC. | 744578 | 2004-01-14 | Dissolved | — |
| Advanced Performance, PLLC | 1053285 | 2014-10-09 | Dissolved | — |
| Advanced Perfusion Services, LLC | 888251 | 2006-03-10 | Active | Belden |