| Administration Officials, LLC | 1192653 | 2019-11-01 | Dissolved | Kiln |
| Administration Plus USA, LLC | 924614 | 2007-12-28 | Dissolved | Madison |
| Administration Specialists of Omaha LLC | 960860 | 2010-01-27 | Dissolved | OMAHA |
| Administrative Concepts 2000 Corporation | 912652 | 2007-05-18 | Canceled | Madison |
| Administrative Concepts 2010, Inc. | 968010 | 2010-06-22 | Canceled | Madison |
| Administrative Consulting, LLC | 960383 | 2010-01-15 | Dissolved | Destin |
| Administrative Control Services, Inc. | 1323532 | 2022-02-08 | Withdrawn | Carriere |
| Administrative Data Management Solutions LLC | 1077025 | 2015-10-01 | Dissolved | JACKSON |
| Administrative Employer Services, Inc. | 981118 | 2011-04-04 | Revoked | Gulfport |
| ADMINISTRATIVE EXECUTIVE GROUP INC | 1090148 | 2016-04-07 | Active | Magee |
| ADMINISTRATIVE FINANCIAL SERVICES, INC. | 576519 | 1990-11-21 | Dissolved | JACKSON |
| Administrative Funds Extra Table, Inc. | 1103335 | 2016-10-14 | Active | Hattiesburg |
| ADMINISTRATIVE MORTGAGE DIVISION INC. | 727352 | 2003-01-03 | Dissolved | Magee |
| ADMINISTRATIVE PARTNERS INTERNATIONAL, INC. | 646454 | 1997-09-02 | Canceled | Gulfport |
| ADMINISTRATIVE RESOURCE MANAGEMENT SERVICES, INC. | 733594 | 2003-05-13 | Dissolved | — |
| Administrative Resource Services, LLC | 867066 | 2005-02-01 | Dissolved | — |
| ADMINISTRATIVE SERVICES CO., LLC | 718971 | 2002-06-21 | Dissolved | TROY |
| Administrative Services Corporation | 883512 | 2005-12-21 | Merged | North Meridian |
| ADMINISTRATIVE SERVICES GROUP, INC. | 519158 | 1984-10-24 | Dissolved | MERIDIAN |
| ADMINISTRATIVE SERVICES, INC. | 130742 | 1969-05-02 | Dissolved | — |
| ADMINISTRATIVE SERVICES, INC. | 572651 | 1990-06-08 | Dissolved | MS |
| Administrative Strategies, LLC | 1478017 | 2025-02-25 | Active | Saucier |
| ADMINISTRATIVE SYSTEMS COMPANY, INC. | 130743 | 1972-07-11 | Dissolved | — |
| ADMINISTRATIVE SYSTEMS, INC. | 724009 | 2003-01-01 | Active | Gulfport |
| Administrative Virtual Office Services LLC | 1149659 | 2018-07-10 | Active | Canton |
| Administrator Services Group, LLC | 854254 | 2004-04-16 | Active | Brandon |
| Administrators for the Professions of Delaware, Inc. | 972106 | 2010-09-23 | Dissolved | LAKE SUCCESS |
| ADMINISTRATORS OF CONSTRUCTION RISK MANAGEMENT, INC. | 658893 | 1998-07-17 | Dissolved | FOLUMBUS |
| AdminOne LLC | 1417262 | 2023-11-02 | Active | Gulfport |
| AdminOne, LLC | 1310789 | 2021-11-08 | Withdrawn | Madison |
| AdminSolutions and More, LLC | 1305437 | 2021-10-01 | Dissolved | Crystal Springs |
| AdminWise LLC | 1412714 | 2023-10-01 | Active | hernando |
| AdminWON LLC | 1395172 | 2023-05-26 | Withdrawn | Jackson |
| AdminWorx LLC | 1122837 | 2017-07-10 | Dissolved | JACKSON |
| Admirable Kreationz & Accessories LLC | 1328494 | 2022-03-08 | Dissolved | Pontotoc |
| Admirable Mangum LLC | 1259534 | 2021-02-04 | Active | RIDGELAND |
| ADMIRABLE MANGUM TRANSPORTATION LLC | 1407210 | 2023-08-18 | Active | Ridegland |
| ADMIRABLE POOLS AND CONSTRUCTION, INC. | 531101 | 1986-07-11 | Dissolved | GULFPORT |
| ADMIRAL BAND BOOSTERS, INCORPORATED | 103130 | 1973-11-09 | Active | GULFPORT |
| ADMIRAL BEN BOW INN, INC. OF MISSISSIPPI | 130744 | 1954-05-21 | Merged | — |
| ADMIRAL BENBOW INN OF PASCAGOULA, INC. | 566350 | 1989-09-18 | Dissolved | PASCAGOULA |
| ADMIRAL BOOSTER CLUB, INC. | 103131 | 1966-12-02 | Active | GULFPORT |
| Admiral Communications, Inc. | 888078 | 2006-03-08 | Dissolved | Pass Christian |
| ADMIRAL CONSTRUCTION COMPANY | 553734 | 1988-05-20 | Dissolved | SOUTHAVEN |
| ADMIRAL DEVELOPMENT, INC. | 640808 | 1997-02-28 | Dissolved | HERNANDO |
| Admiral Diamond Booster Club | 1104192 | 2016-10-27 | Active | Gulfport |
| Admiral Enforcement II, L.L.C. | 1271085 | 2021-04-05 | Active | Madison |
| Admiral Fleet Cleaning, LLC | 1459728 | 2024-09-30 | Active | Hernando |
| ADMIRAL FUNDING, LLC | 671954 | 1999-06-08 | Dissolved | BIRMINGHAM |
| Admiral Imperial Lionheart Properties LLC | 1105767 | 2016-11-22 | Revoked | Vicksburg |