| American Accounting & Technology Services LLC | 1460600 | 2024-10-05 | Dissolved | Ridgeland |
| AMERICAN ACCOUNTING OF JACKSON, INC. | 433535 | 1977-11-01 | Dissolved | — |
| American Achievement Corporation | 1128082 | 2017-09-15 | Revoked | Gulfport |
| AMERICAN ACOUSTICAL AND DRYWALL, INC. | 403494 | 1987-03-10 | Dissolved | BILOXI |
| American Acquire Corporation | 919800 | 2007-09-25 | Active | Magee |
| American Acquisition Group LLC | 920564 | 2007-10-11 | — | Gulfport |
| American Acquisition Group, LLC | 976394 | 2010-12-29 | — | Gulfport |
| AMERICAN ACTUATOR, INC. | 519962 | 1984-12-11 | Dissolved | — |
| AMERICAN AD VANTAGE, INC. | 500075 | 1981-11-30 | Dissolved | — |
| AMERICAN ADCO, INC. | 8706360 | 1987-12-28 | Dissolved | — |
| American Addiction Centers, Inc. | 1072994 | 2015-08-07 | Active | Gulfport |
| AMERICAN ADJUSTERS, INC. | 732267 | 2003-04-14 | Dissolved | — |
| AMERICAN ADJUSTMENT BUREAU OF GULFPORT, INC. | 307419 | 1981-03-09 | Dissolved | GULFPORT |
| AMERICAN ADJUSTMENT BUREAU, INC. | 613870 | 1995-01-05 | Dissolved | — |
| AMERICAN ADJUSTMENT COMPANY, INC. | 307420 | 1979-01-22 | Canceled | Gulfport |
| AMERICAN ADMINISTRATIVE SERVICES, INC. | 578305 | 1991-02-12 | Dissolved | JACKSON |
| AMERICAN ADMIXTURES AND CHEMICALS CORPORATION | 503367 | 1982-05-07 | Revoked | Madison |
| American Advanced Technologies, L.L.C. | 1019915 | 2013-04-09 | Revoked | Houma |
| AMERICAN ADVANTAGE ASSOCIATION | 584674 | 1991-12-23 | Active | Oxford |
| American Advantage Insurance - Nelson Agency, Inc. | 1552102 | 2026-05-29 | Active | Jackson |
| AMERICAN ADVENTURE TOURS, INC. | 433536 | 1980-02-28 | — | — |
| AMERICAN ADVENTURE TRAVEL, INC. | 307421 | 1980-02-28 | Dissolved | — |
| AMERICAN ADVERTISING CORPORATION | 433537 | 1964-03-26 | Dissolved | — |
| American Aerial, Video & Photography LLC | 1510312 | 2025-09-28 | Active | Olive Branch |
| American Aerogel Corporation | 1281619 | 2021-05-12 | Active | Gulfport |
| American Affiliate Co. LLC | 1330537 | 2022-03-18 | Active | JACKSON |
| American Affordable Insurance | 998066 | 2012-03-21 | Canceled | Provo |
| American African Flag, LLC | 887669 | 2006-03-02 | Dissolved | Vicksburg |
| AMERICAN AFRICANA COLLECTIBLES, INC. | 621288 | 1995-08-18 | Dissolved | — |
| American Ag Aviation, LLC | 1323694 | 2022-02-08 | Active | Tupelo |
| American Ag Investments, LLC | 1364790 | 2022-11-03 | Active | Cleveland |
| AMERICAN AGENCY CREDIT COMPANY | 433538 | 1970-10-15 | Dissolved | NORTH WEST ATLANTA |
| AMERICAN AGENCY LEASING COMPANY | 307422 | 1970-10-28 | Revoked | NORTH WEST ATLANTA |
| AMERICAN AGENCY SYSTEM, INC. | 658537 | 1998-07-08 | Canceled | Gulfport |
| AMERICAN AGRIBUSINESS SOLUTIONS, INC. | 740977 | 2003-10-23 | Dissolved | Rolling Fork |
| AMERICAN AGRICULTURAL ASSOCIATION (A. A. L.) | 307423 | 1973-10-10 | Active | JACKSON |
| AMERICAN AGRICULTURAL CHEMICAL COMPANY | 433539 | 1966-02-28 | Canceled | Gulfport |
| AMERICAN AGRICULTURAL CHEMICAL COMPANY | 433540 | 1963-07-30 | Merged | Gulfport |
| AMERICAN AGRICULTURAL CLEARHINGHOUSE CO-OPERATIVE, INC. | 502758 | 1982-04-07 | Active | ELLISVILLE |
| AMERICAN AGRICULTURAL SERVICE MISSISSIPPI, INC. | 581132 | 1991-06-24 | Dissolved | Greenville |
| American Agricultural Services, LLC | 1283959 | 2021-06-01 | Active | Greenville |
| AMERICAN AGRONOMICS CORPORATION | 433542 | 1975-01-24 | Revoked | Madison |
| AMERICAN AID AND BENEFIT ASSOCIATION OF MERIDIAN, THE | 433543 | 1901-09-18 | Inactive | — |
| American Air Conditioning & Mechanical, Inc. | 1173223 | 2019-03-25 | Withdrawn | JACKSON |
| AMERICAN AIR CONDITIONING COMPANY, INC. | 307424 | 1976-02-10 | Dissolved | — |
| American Air Conditioning LLC | 1230015 | 2020-08-09 | Dissolved | BRANDON |
| American Air Filter Company Inc | 991467 | 2011-11-07 | Active | Gulfport |
| AMERICAN AIR INDUSTRIES, INC. | 580619 | 1991-05-29 | Dissolved | GREENVILLE |
| American Air Service and Mechanical, Inc. | 1148180 | 2018-05-30 | Revoked | bogue chitto |
| AMERICAN AIR SERVICE, INC. | 433544 | 1979-09-21 | Dissolved | — |