| AMERICAN TELEFUNDING, INC. | — | 1459262 | 1989-11-29 | Revoked | |
| AMERICAN TELENET SYSTEMS, INC. | — | 1390947 | 1988-04-27 | Revoked | |
| AMERICAN TELEPHONE ADVERTISING CORPORATION | — | 1321843 | 1986-08-08 | Revoked | |
| AMERICAN TELEPHONE AND TELEGRAPH COMPANY | — | 1644053 | 1993-12-17 | Dissolved | |
| AMERICAN TELEPHONE AND TELEGRAPH COMPANY OF WYOMING | — | 159202 | 1929-10-18 | Merged | |
| AMERICAN TELEPHONE NETWORK, INC. | — | 1585967 | 1992-10-26 | Withdrawn | |
| AMERICAN TELETRONICS LONG DISTANCE, INC. | — | 1570472 | 1992-06-18 | Revoked | |
| AMERICAN TELEVENTURE CORPORATION | — | 1473446 | 1990-03-26 | Withdrawn | |
| AMERICAN TELEVISION RELAY, INC. | — | 559161 | 1966-03-14 | Expired | |
| AMERICAN TERRAZO & TILE CO. | — | 490102 | 1963-05-14 | Revoked | |
| AMERICAN TERRAZZO COMPANY, INC. | — | 1886209 | 1997-09-11 | Revoked | |
| AMERICAN TERRAZZO COMPANY, LP | — | LPF2011092801 | 2011-09-28 | Active | |
| AMERICAN TESTING AND ENGINEERING CORPORATION | — | 1034222 | 1979-10-18 | Revoked | |
| AMERICAN TEXTURIZED COATINGS, INC. | — | 910869 | 1977-03-01 | Revoked | |
| AMERICAN THERMAL DESIGN, INC. | — | 1597731 | 1993-01-22 | Revoked | |
| AMERICAN THIN TUBE & WINDOW CORP. | — | 1605450 | 1993-03-18 | Dissolved | |
| AMERICAN THROMBOSIS AND HERMOSTASIS NETWORK, INC. | — | 6142176 | 2020-04-28 | Active | Roswell |
| AMERICAN THUNDER TRYKE, INCORPORATED | — | 1536895 | 1991-09-17 | Revoked | |
| AMERICAN THUNDER USA, LLC | — | 5962196 | 2019-08-02 | Active | Albuquerque |
| AMERICAN TILE & BRICK, INC. | — | 4613600 | 2012-03-16 | Active | Carson City |
| AMERICAN TIN CORPORATION | — | 115444 | 1922-12-05 | Expired | |
| AMERICAN TIRE AND SERVICES, INC. | — | 2181915 | 2001-07-13 | Revoked | Tijeras |
| AMERICAN TIRE DISTRIBUTORS, INC. | — | 2261337 | 2002-06-19 | Active | Dover |
| AMERICAN TITLE & CHECK LOANS, LLC | — | 2276442 | 2002-09-03 | Active | |
| AMERICAN TITLE AND TRUST COMPANY | — | 55582 | 1908-07-14 | Expired | |
| AMERICAN TITLE COMPANY, INC. | — | 297077 | 1953-01-07 | Revoked | |
| AMERICAN TOTALISATOR COMPANY, INC. | — | 393991 | 1958-10-20 | Withdrawn | |
| AMERICAN TOURS, INC. | — | 2269736 | 2002-07-25 | Revoked | |
| AMERICAN TOWER ASSET SUB, LLC | — | 2856615 | 2007-03-27 | Active | |
| AMERICAN TOWER DELAWARE CORPORATION | — | 2056687 | 2000-01-10 | Revoked | Wilmington |
| AMERICAN TOWER GUARANTOR SUB, LLC | — | 2851558 | 2007-03-15 | Active | |
| AMERICAN TOWER HOLDING SUB, LLC | — | 2855062 | 2007-03-22 | Active | |
| AMERICAN TOWER MANAGEMENT, LLC | — | 2079440 | 2000-04-14 | Active | |
| AMERICAN TOWER MANAGEMENT, LLC | — | 2436632 | 2004-03-02 | Withdrawn | |
| AMERICAN TOWER SERVICES, INC. | — | 1198944 | 1983-11-18 | Withdrawn | |
| AMERICAN TOWER, LIMITED PARTNERSHIP | — | LPF1998060901 | 1998-06-09 | Active | |
| AMERICAN TOWERS LLC | — | 2001584 | 2019-09-26 | Active | WILMINGTON |
| AMERICAN TOWERS OF NEW MEXICO, LLC | — | 1915495 | 1998-01-29 | Withdrawn | |
| AMERICAN TOWING COMPANY LLC | — | 2217719 | 2001-12-28 | Active | |
| AMERICAN TRADE ASSOCIATION, INC. | — | 4181889 | 2009-06-18 | Revoked | |
| AMERICAN TRADE CONSULTANTS, INC. | — | 1448323 | 1989-08-24 | Revoked | |
| AMERICAN TRADE EXCHANGE, INC. | — | 1191105 | 1983-08-31 | Revoked | |
| AMERICAN TRADE GROUP, LLC | — | 5450969 | 2017-06-12 | Active | Albuquerque |
| AMERICAN TRADE MASTERS LTD. CO. | — | 4740580 | 2013-05-10 | Active | TIJERAS |
| AMERICAN TRADING & RECYCLING, INC. | — | 2247955 | 2002-04-25 | Revoked | |
| AMERICAN TRADING AND CONSULTING LLC | — | 7947178 | 2024-12-02 | Active | |
| AMERICAN TRADING AND PRODUCTION CORPORATION | — | 240747 | 1946-02-28 | Merged | |
| AMERICAN TRADING CO., INC. | — | 2121119 | 2000-10-23 | Dissolved | |
| AMERICAN TRADING ROYALTY COMPANY, INC. | — | 722587 | 1972-02-14 | Merged | |
| AMERICAN TRADITION CONSTRUCTION, LLC | — | 2630481 | 2005-09-06 | Active | |