| Advanced Clinical Employment Staffing, LLC | 937268 | 2008-08-25 | Active | Gulfport |
| ADVANCED CLOSET SYSTEMS, LLC | 651228 | 1998-01-07 | Dissolved | — |
| ADVANCED CLOSURES, INC. | 518806 | 1985-02-18 | — | Gulfport |
| Advanced CNC Technologies Inc | 1061853 | 2015-02-25 | Active | Gulfport |
| Advanced CNC Technologies, Inc. | 1007578 | 2012-08-30 | Withdrawn | Gulfport |
| ADVANCED COATINGS SPECIALISTS, INC. | 592067 | 1992-10-27 | Dissolved | JACKSON |
| ADVANCED COLLECTION SERVICES, INC. | 528857 | 1986-03-19 | Revoked | Madison |
| Advanced Collections and Testing LLC | 1036085 | 2014-02-13 | Dissolved | — |
| ADVANCED COLLECTIONS, INC. | 658821 | 1950-01-30 | Dissolved | MERIDIAN |
| ADVANCED COLLISION BAY ST. LOUIS, INC. | 732486 | 2003-04-17 | Dissolved | Gulfport |
| Advanced Collision of Biloxi, Inc. | 974311 | 2010-11-10 | Dissolved | Biloxi |
| Advanced Collision of Hattiesburg East, Inc. | 1035814 | 2014-02-10 | Dissolved | Gulfport |
| Advanced Collision of Hattiesburg, Inc. | 884466 | 2006-01-09 | Dissolved | Biloxi |
| Advanced Collision Repair, LLC | 888749 | 2006-03-16 | Dissolved | West Starkville |
| ADVANCED COLLISION SERVICE, INC. | 677484 | 1999-10-19 | Dissolved | Gulfport |
| Advanced Collision, Inc. | 930837 | 2008-04-21 | Active | Nesbit |
| Advanced Comfort LLC | 1375481 | 2023-01-26 | Dissolved | LAKE CORMORANT |
| Advanced Comfort Solutions, LLC | 1088439 | 2016-03-16 | Dissolved | Lake Cormorant |
| Advanced Commercial and Residential Repairs, LLC | 1134525 | 2017-12-18 | Dissolved | Ocean Springs |
| Advanced Commercial Services LLC | 1181886 | 2019-06-26 | Active | Gulfport |
| Advanced Communication Systems, LLC | 924036 | 2007-12-17 | Dissolved | Gulfport |
| Advanced Communications and Infrastructure LLC | 1007427 | 2012-08-28 | Dissolved | Petal |
| ADVANCED COMMUNICATIONS GROUP, INC. | 645319 | 1997-07-31 | Revoked | Gulfport |
| ADVANCED COMMUNICATIONS PARTNERS, INC. | 655397 | 1998-04-17 | Dissolved | — |
| Advanced Communications Sales and Service, LLC | 943706 | 2009-01-20 | Active | Laurel |
| Advanced Communications USA, Inc. | 982003 | 2011-04-19 | Revoked | Madison |
| ADVANCED COMMUNICATIONS, INC. | 576986 | 1991-01-02 | Dissolved | laurel |
| Advanced Communications, Inc. | 952287 | 2009-07-15 | Dissolved | Gulfport |
| Advanced Components Marketing | 946202 | 2009-03-10 | Dissolved | — |
| Advanced Composting Technologies LLC | 1026615 | 2013-08-21 | Active | Gulfport |
| ADVANCED COMPUTER CONSULTANTS, INC. | 658318 | 1978-06-09 | — | — |
| ADVANCED COMPUTER RESEARCH, INC. | 130766 | 1969-11-19 | Dissolved | — |
| ADVANCED COMPUTER SERVICE & SUPPORT, INC. | 573114 | 1990-06-28 | Dissolved | BILOXI |
| Advanced Computer Services Unlimited, LLC | 854104 | 2004-04-13 | Dissolved | — |
| ADVANCED COMPUTER SOLUTIONS, LLC | 743157 | 2003-12-16 | Dissolved | — |
| ADVANCED COMPUTER SYSTEMS, INC. | 574064 | 1990-08-06 | Canceled | Gulfport |
| ADVANCED COMPUTER TECHNOLOGICAL SERVICES, INC. | 130767 | 1979-09-14 | Dissolved | — |
| ADVANCED COMPUTER TECHNOLOGY INC. | 519566 | 1984-11-15 | Dissolved | PETAL |
| Advanced Computing Made Easy LLC | 939476 | 2008-10-10 | — | Gulfport |
| ADVANCED CONCEPTS LLC | 1272990 | 2021-04-13 | Dissolved | JACKSON |
| ADVANCED CONCEPTS, INC. | 130768 | 1970-04-09 | Dissolved | — |
| Advanced Concrete Concepts, Inc. | 872149 | 2005-05-11 | Dissolved | Biloxi |
| Advanced Concrete Design, LLC | 883687 | 2005-12-27 | Dissolved | — |
| Advanced Concrete Engineering, L.L.C. | 854835 | 2004-04-29 | Dissolved | — |
| ADVANCED CONNECTIVITY, INC. | 657111 | 1998-06-01 | Revoked | METAIRIE |
| Advanced Connectivity, LLC | 1411789 | 2023-09-19 | Active | Gulfport |
| Advanced Construction & Development, Inc. | 923210 | 2007-12-03 | Canceled | CRESTVIEW |
| Advanced Construction & Development, LLC | 1055661 | 2014-11-18 | Active | Biloxi |
| Advanced Construction and Development MS, LLC | 1023244 | 2013-06-20 | Dissolved | — |
| Advanced Construction Coatings, Inc. | 955298 | 2009-09-18 | Dissolved | Long Beach |