| ADVANCED TELECOMMUNICATION NETWORK, INC. | 619494 | 1995-06-22 | Revoked | CHERRY HILL |
| ADVANCED TELECOMMUNICATIONS CORPORATION | 575605 | 1990-10-19 | Revoked | Madison |
| Advanced Telemed Inc. | 1064361 | 2015-04-01 | Withdrawn | JACKSON |
| ADVANCED TELEPHONE SERVICES, INC. | 509001 | 1983-05-02 | Dissolved | Gulfport |
| ADVANCED TELEPHONE SYSTEMS OF JACKSON, INC. | 522275 | 1985-05-08 | Dissolved | — |
| ADVANCED TELEPHONE SYSTEMS, INC. | 565072 | 1989-07-20 | Dissolved | BOONEVILLE |
| ADVANCED TEMPERATURE CONTROL, L.L.C. | 688987 | 2000-07-05 | Dissolved | — |
| Advanced Therapeutics, LLC | 969151 | 2010-07-16 | Dissolved | — |
| Advanced Therapeutics, P. A. | 981702 | 2011-04-13 | Dissolved | Ridgeland |
| ADVANCED THERAPEUTICS, P.A. | 675021 | 1995-06-01 | Dissolved | RIDGELAND |
| Advanced Tile Company LLC | 1180099 | 2019-06-06 | Active | OXFORD |
| Advanced Tile Company, LLC | 864794 | 2004-12-13 | Dissolved | — |
| Advanced Tile Solutions LLC | 1112918 | 2017-03-02 | Dissolved | Jackson |
| Advanced Title & Escrow, LLC | 892967 | 2006-05-30 | Dissolved | — |
| Advanced Title Services, Inc. | 880472 | 2005-10-27 | Dissolved | — |
| Advanced TNT Plumbing LLC | 981557 | 2011-04-11 | Dissolved | — |
| ADVANCED TOWER STRUCTURAL SOLUTIONS, LLC | 1551735 | 2026-05-27 | Active | JACKSON |
| Advanced Towing & Recovery LLC | 1493450 | 2025-06-09 | Active | Laurel |
| ADVANCED TOWING & RECOVERY, LLC | 724531 | 2002-10-28 | Dissolved | — |
| Advanced Towing LLC | 1494913 | 2025-06-18 | Active | Laurel |
| Advanced Towing, LLC | 957179 | 2009-10-29 | Dissolved | — |
| Advanced Trader Investment Advisors, L.L.C. | 1085865 | 2016-02-17 | Withdrawn | Madison |
| Advanced Trading, LLC | 933285 | 2008-06-06 | Dissolved | — |
| ADVANCED TRAINING SPECIALTIES | 676545 | 1999-09-27 | Dissolved | — |
| Advanced Transportation and Logistics, LLC | 1550522 | 2026-05-21 | Active | Pearl |
| Advanced Transportation, LLC | 873146 | 2005-05-31 | Dissolved | — |
| Advanced Tree Care LLC | 1526125 | 2026-01-17 | Active | Jackson |
| Advanced Tree Service Co. | 1305601 | 2021-09-29 | Active | Magnolia |
| Advanced Trim & Kitchens, LLC | 909871 | 2007-04-04 | Dissolved | East Kinzers |
| Advanced Turbine Training, LLC | 1372073 | 2023-01-04 | Active | Shelby |
| ADVANCED UNDERGROUND IMAGING, INC. | 731976 | 2003-04-07 | Dissolved | Gulfport |
| Advanced Underground, Inc | 1060292 | 2015-02-03 | Dissolved | — |
| Advanced Utilities LLC | 1489794 | 2025-05-14 | Active | Jackson |
| Advanced Utility Services, LLC | 1008384 | 2012-09-19 | Revoked | Gulfport |
| ADVANCED VALVE TECHNOLOGY, LLC | 682556 | 2000-02-16 | Dissolved | — |
| Advanced Vascular Access Center, LLC | 1078549 | 2015-10-27 | Dissolved | Ridgeland |
| Advanced Vascular and Vein Associates, LLC | 1299113 | 2021-08-16 | Active | Flowood |
| Advanced Vascular Solutions, LLC | 950391 | 2009-06-03 | Active | Gulfport |
| Advanced Vending Solutions, LLC | 1455738 | 2024-08-28 | Active | Clinton |
| Advanced Vending Systems, Inc | 859053 | 2004-08-03 | Dissolved | Gulfport |
| Advanced Vending Systems, LLC | 867883 | 2005-02-16 | Dissolved | Gulfport |
| Advanced Vending, LLC | 1032285 | 2013-12-06 | Dissolved | Flowood |
| Advanced Ventures, Limited Liability Company | 1053698 | 2014-10-16 | Active | Hattiesburg |
| Advanced Video Auctions, Inc. | 962335 | 2010-02-25 | Dissolved | Gulfport |
| ADVANCED VIDEO SURVEILLANCE INC. | 670740 | 1999-05-12 | Dissolved | — |
| Advanced Vision Center, PLLC | 869468 | 2005-03-16 | Active | Laurel |
| ADVANCED WALL SYSTEMS, INC. | 531191 | 1986-07-16 | Dissolved | — |
| Advanced Wall Systems, LLC | 929375 | 2008-03-26 | Dissolved | — |
| Advanced Waste Disposal, LLC | 1475241 | 2025-02-05 | Active | Grenada |
| Advanced Water Solutions, LLC | 1149335 | 2018-06-12 | Active | Long Beach |