| American Building Interiors, Inc | 932366 | 2008-05-19 | Revoked | Flowood |
| AMERICAN BUILDING MAINTENANCE CO. OF GEORGIA | 500077 | 1982-02-22 | Canceled | Gulfport |
| AMERICAN BUILDING MATERIAL, INC. | 608610 | 1994-06-28 | Revoked | DALLAS |
| American Building Specialists, LLC | 1369849 | 2022-12-15 | Active | HATTIESBURG |
| AMERICAN BUILDING SPECIALTIES CORPORATION | 551927 | 1988-03-10 | Revoked | MANDEVILLE |
| AMERICAN BUILDING SYSTEMS, INC. | 557748 | 1988-10-04 | Dissolved | JACKSON |
| AMERICAN BUILDINGS COMPANY | 652059 | 1998-01-26 | Active | Gulfport |
| AMERICAN BUREAU OF SHIPPING, INC. | 307450 | 1980-01-08 | Active | Madison |
| AMERICAN BUREAU OF SHIPPING, INC. | 433583 | 1970-09-25 | Canceled | Gulfport |
| AMERICAN BURIAL AND CREMATION CENTERS, INC. | 629159 | 1996-04-17 | Dissolved | Gulfport |
| AMERICAN BUSINESS & INDUSTRIAL DEVELOPMENT CORPORATION | 433585 | 1967-08-24 | Dissolved | — |
| American Business & Professional Program, LLC | 1362690 | 2022-10-19 | Active | JACKSON |
| AMERICAN BUSINESS ALLIANCE, INC. | 628746 | 1996-03-27 | Revoked | WEST CHESTER |
| American Business Association | 895904 | 2006-07-21 | Active | Madison |
| AMERICAN BUSINESS COALITION | 655852 | 1993-09-24 | Canceled | Gulfport |
| AMERICAN BUSINESS COMMUNICATIONS, INC. | 529753 | 1986-04-28 | Dissolved | — |
| AMERICAN BUSINESS CONSULTANTS, INC. | 307452 | 1978-09-27 | Dissolved | — |
| AMERICAN BUSINESS CORPORATION | 670807 | 1999-05-13 | Dissolved | — |
| AMERICAN BUSINESS CREDIT CORPORATION | 581552 | 1991-07-17 | Withdrawn | Gulfport |
| AMERICAN BUSINESS EXCHANGE, LTD. | 555475 | 1988-07-29 | Dissolved | JACKSON |
| AMERICAN BUSINESS FORMS, INC. | 621343 | 1995-08-21 | Active | Madison |
| AMERICAN BUSINESS LEASING, INC. | 645634 | 1997-08-08 | Dissolved | Madison |
| AMERICAN BUSINESS LOCATIONS, INC. | 433586 | 1976-04-22 | Dissolved | — |
| AMERICAN BUSINESS PRODUCTS LLC | 700839 | 2001-04-16 | Dissolved | EDWARDS |
| AMERICAN BUSINESS SERVICES, INC. | 433587 | 1973-08-21 | Dissolved | — |
| AMERICAN BUSINESS SERVICES, INC. | 729919 | 2003-02-25 | Dissolved | North Lauderdale |
| AMERICAN BUSINESS SUPPLY COMPANY | 584010 | 1991-11-21 | Dissolved | OXFORD |
| AMERICAN BUSINESS SYSTEMS CORP. | 433588 | 1959-10-20 | Revoked | WILMINGTON |
| AMERICAN BUSINESSMAN'S WORLDWIDE ASSOCIATION, LTD. | 561565 | 1989-02-24 | Canceled | Gulfport |
| AMERICAN BUSLINES, INC. | 433589 | 1947-05-23 | Canceled | WILMINGTON |
| AMERICAN BUTANE SERVICE, INC. | 307453 | 1978-02-07 | Dissolved | Gulfport |
| AMERICAN BUYERS RESEARCH, INC. | 8703332 | 1987-07-10 | Dissolved | Ridgeland |
| AMERICAN CAB COMPANY, INC. | 533453 | 1986-11-21 | Dissolved | MERIDIAN |
| AMERICAN CABLE SYSTEMS, INC. | 307454 | 1963-06-28 | — | TUPELO |
| AMERICAN CABLING AND ELECTRICAL, INC. | 663346 | 1998-11-11 | Dissolved | Madison |
| AMERICAN CABLING CONNECTIONS, INC. | 632881 | 1996-08-08 | Dissolved | — |
| American Cafe, LLC | 961545 | 2010-02-09 | Dissolved | Ridgeland |
| American Cafe, LLC | 1400643 | 2023-07-04 | Active | Flowood |
| AMERICAN CALCULATOR AND COMPUTER COMPANY, INC. | 533107 | 1986-10-30 | Revoked | BRIMINGHAM |
| AMERICAN CAN COMPANY | 307455 | 1965-05-19 | — | Gulfport |
| AMERICAN CAN COMPANY | 8704751 | 1987-10-01 | Canceled | Gulfport |
| AMERICAN CAN PACKAGING INC. | 529256 | 1986-04-02 | Merged | Madison |
| AMERICAN CAN PACKAGING INC. | 8706544 | 1987-12-31 | Canceled | Gulfport |
| American Cancer Consulting LLC | 976933 | 2011-01-11 | Dissolved | Ridgeland |
| American Cancer Society Cancer Action Network, Inc | 1007301 | 2012-08-24 | Active | Gulfport |
| AMERICAN CANCER SOCIETY, INC. | 701166 | 2001-04-23 | Active | Gulfport |
| AMERICAN CANCER SOCIETY, MID-SOUTH DIVISION, INC. | 633564 | 1948-08-07 | Merged | Jackson |
| AMERICAN CANCER SOCIETY, MISSISSIPPI DIVISION | 307456 | 1948-08-07 | — | — |
| American Cannabis Association LLC | 1260335 | 2021-02-12 | Dissolved | Union |
| American Cannabis Company, LLC | 1501002 | 2025-07-29 | Active | JACKSON |