| ADVANCED TECHNOLOGY PRODUCTS, INC. | — | D233728 | 2013-02-01 | Active | — |
| ADVANCED TEETH WHITENING, LLC | — | C190615 | 2008-12-15 | Dissolved | — |
| ADVANCED TELCOM, INC. | — | F034513 | 2000-02-03 | Revoked | SALEM |
| ADVANCED TELECOMMUNICATION NETWORK, INC. | — | F026580 | 1995-05-10 | Revoked | CHERRY HILL |
| ADVANCED TELECOMMUNICATIONS CORPORATION | — | F022283 | 1991-05-28 | Withdrawn | DOVER |
| ADVANCED TELEMANAGEMENT GROUP, INC | — | F043468 | 2004-04-23 | Revoked | SCOTTSDALE |
| ADVANCED TELEPHONY PRODUCTS, INC. | — | D099062 | 1999-05-05 | Active | — |
| ADVANCED TELEPHONY SOLUTIONS, INC. | — | D083482 | 1995-07-06 | Dissolved | — |
| ADVANCED TEXTILE CARE LLC | — | C259971 | 2015-03-23 | Dissolved | MISSOULA |
| Advanced Therapeutics of Montana, LLC | — | C1219479 | 2021-05-25 | Expired | — |
| ADVANCED THERAPIES, INC. | — | D103498 | 2000-04-17 | Dissolved | — |
| ADVANCED THERAPY CLINIC, LLC | — | C266816 | 2015-09-23 | Active | — |
| ADVANCED TILE AND STONE, INC. | — | D144078 | 2005-05-10 | Active | — |
| Advanced Times LLC | — | C1649489 | 2026-06-12 | Active | — |
| ADVANCED TINTING SOLUTIONS L.L.C. | — | C145044 | 2005-06-09 | Dissolved | MISSOULA |
| ADVANCED TOOL AND MACHINE LLC | — | C198014 | 2009-09-24 | Dissolved | — |
| Advanced Tool Solutions LLC | — | C1044124 | 2017-05-10 | Dissolved | — |
| Advanced Tower Services, LLC | — | E1573803 | 2025-10-07 | Active | — |
| Advanced Towing & Recovery LLC | — | C1309806 | 2022-09-12 | Active | — |
| ADVANCED TOWING LLC | — | C201516 | 2010-01-29 | Active | — |
| ADVANCED TRACKING SOLUTIONS, LLC | — | C155700 | 2006-04-24 | Dissolved | BIGFORK |
| ADVANCED TRAFFIC PRODUCTS, INC. | — | F024605 | 1993-10-21 | Active | — |
| Advanced Trail Services LLC | — | C1145836 | 2020-01-29 | Active | — |
| ADVANCED TRAINING & SPORTS CONDITIONING, INC. | — | D137181 | 2004-10-13 | Dissolved | — |
| Advanced Training Systems International, Inc. | — | D1265689 | 2022-02-08 | Active | — |
| ADVANCED TRANSPORTATION LLC | — | C1487360 | 2024-11-20 | Active | — |
| ADVANCED TRANSPORTATION SERVICES LLC. | — | C239242 | 2013-07-17 | Dissolved | MISSOULA |
| ADVANCED TREATMENT SYSTEMS, INC. | — | D073905 | 1992-06-18 | Dissolved | — |
| ADVANCED TREATMENT SYSTEMS, LLC | — | C111339 | 2001-09-04 | Dissolved | POLSON |
| Advanced Trucking LLC | — | C1044662 | 2017-05-15 | Active | — |
| Advanced Turbine Support LLC | — | E1450506 | 2024-06-05 | Active | — |
| ADVANCED UNDERGROUND UTILITY LOCATING, INC. | — | F1374893 | 2023-07-14 | Active | — |
| ADVANCED UPHOLSTERY, L.L.C. | — | C078757 | 1994-03-22 | Dissolved | FLORENCE |
| ADVANCED VACATION PHOTO, L.L.C. | — | C191737 | 2009-01-29 | Dissolved | RED LODGE |
| Advanced Ventures, LLC | — | C1571111 | 2025-09-26 | Active | — |
| Advanced Veterinary Technologies LLC | — | C1654584 | 2026-06-30 | Active | — |
| ADVANCED VIDEO SURVEILLANCE LLC | — | C258544 | 2015-02-17 | Dissolved | VICTOR |
| Advanced Visual Technologies LLC | — | C1107004 | 2019-01-23 | Active | — |
| ADVANCED WALL ADVERTISING, INC. | — | D202037 | 2010-02-23 | Dissolved | — |
| ADVANCED WASTEWATER SPECIALISTS, LLC | — | C147833 | 2005-09-08 | Active | LIVINGSTON |
| Advanced Water Sampling, LLC | — | C1158006 | 2020-05-11 | Active | — |
| ADVANCED WATER SOLUTIONS, INC. | — | D134822 | 2004-07-13 | Dissolved | — |
| ADVANCED WATER SYSTEMS, INC. | — | D235281 | 2013-03-13 | Dissolved | — |
| ADVANCED WEALTH ADVISORS, INC. | — | F060589 | 2010-09-14 | Revoked | BLOOMINGTON |
| Advanced Wealth Concepts, Inc | — | F1025799 | 2016-10-27 | Revoked | — |
| Advanced Weapons Systems, Inc. | — | F1564541 | 2025-09-03 | Active | — |
| Advanced Weapons Systems, Inc. | — | D1482150 | 2024-10-28 | Dissolved | — |
| ADVANCED WEATHERIZATION SYSTEMS, INC. | — | F024046 | 1993-04-19 | Revoked | EDINA |
| ADVANCED WELDING & STEEL, INC. | — | F072461 | 2014-05-13 | Revoked | GRANGEVILLE |
| ADVANCED WELDING SOLUTIONS LLC | — | E075537 | 2015-04-24 | Revoked | PASADENA |