| AMERICAN LINES, INC. | — | 19690011 D | 1969-05-01 | Suspended | PORTLAND |
| AMERICAN LIONESS LLC | — | 202510757DC | 2025-01-27 | Active | MILBRIDGE |
| AMERICAN LIQUID AIR, INC. | — | 19810203 F | 1981-01-13 | Withdrawn | AUGUSTA |
| AMERICAN LIQUID AIR, INC. | — | 19910644 F | 1991-06-24 | Withdrawn | AUGUSTA |
| AMERICAN LIQUID ASPHALTS, INC. | — | 19770050 F | 1976-08-26 | Withdrawn | AUGUSTA |
| AMERICAN LIVER FOUNDATION | — | 202500011NF | 2024-07-22 | Active | PORTLAND |
| AMERICAN LOGGERS COUNCIL | — | 20000026NF | 1999-12-13 | Withdrawn | AUGUSTA |
| AMERICAN LOGGERS FIRE SUPPRESSION, LLC | — | 20170421FC | 2016-12-06 | Active | BANGOR |
| AMERICAN LOGGERS INSURANCE AGENCY, LLC | — | 20103203DC | 2010-05-14 | Active | BANGOR |
| AMERICAN LOGGERS INSURANCE COMPANY | — | 20180000 I | 2017-07-19 | Dissolved | Portland |
| AMERICAN LONG LINES, INC. | — | 20020334 F | 2001-10-17 | Withdrawn | AUGUSTA |
| AMERICAN LONG LINES, INC. | — | 19970523 F | 1996-11-27 | Withdrawn | AUGUSTA |
| AMERICAN LUNG ASSOCIATION | — | 19180006ND | 1918-10-08 | Active | MERRILL'S WHARF, PORTLAND |
| AMERICAN LUNG ASSOCIATION OF MAINE | — | 19210008ND | 1921-06-10 | Merged | AUGUSTA |
| AMERICAN LUNG ASSOCIATION OF THE NORTHEAST, INC. | — | 20080013NF | 2007-09-10 | Merged | PORTLAND |
| AMERICAN MACHINE PRODUCTS | — | 19990642 D | 1998-10-13 | Dissolved | PORTLAND |
| AMERICAN MADE & MAILED LLC | — | 202604204DC | 2025-10-03 | Active | YORK |
| AMERICAN MADE CONSTRUCTION CO. LLC | — | 202506437DC | 2024-10-07 | Active | EMBDEN |
| AMERICAN MADE LLC | — | 20186061DC | 2018-04-30 | Dissolved | LEBANON |
| AMERICAN MAID LLC | — | 20237174DC | 2022-08-30 | Dissolved | YORK |
| AMERICAN MAIDS LLC | — | 202600249DC | 2025-07-10 | Dissolved | YORK |
| AMERICAN MAIL ORDER PHARMACY, INC. | — | 20140077 F | 2013-07-26 | Withdrawn | CHELSEA |
| AMERICAN MAINTENANCE, INC. | — | 19892160 D | 1989-03-15 | Suspended | SACO |
| AMERICAN MAMA, LLC | — | 202600964DC | 2025-08-07 | Active | SKOWHEGAN |
| AMERICAN MANAGEMENT ASSOCIATION INTERNATIONAL | — | 19990033NF | 1999-01-27 | Active | AUGUSTA |
| AMERICAN MANAGEMENT CORPORATION | — | 20020050 F | 2001-07-24 | Active | AUGUSTA |
| AMERICAN MANAGEMENT GROUP | — | 19620121 D | 1962-09-27 | Merged | SOUTH PORTLAND |
| AMERICAN MANAGEMENT SERVICES, INC. | — | 19970065 F | 1996-07-23 | Withdrawn | AUGUSTA |
| AMERICAN MANAGEMENT SERVICES, INC. | — | 19900111 F | 1989-09-07 | Withdrawn | AUGUSTA |
| AMERICAN MANUFACTURED HOUSING COMMUNITIES, LLC | — | 20132838DC | 2013-03-06 | Dissolved | Portland |
| AMERICAN MANUFACTURING | — | 19930507 D | 1992-09-24 | Suspended | AUBURN |
| AMERICAN MARIJUANA CULTIVATORS, LLC | — | 20200630DC | 2019-08-01 | Dissolved | LINCOLN |
| AMERICAN MARINE CORPORATION | — | 20070516 F | 2006-12-18 | Withdrawn | AUGUSTA |
| AMERICAN MARKETING & PUBLISHING LLC | — | 202600834FC | 2025-11-04 | Active | AUGUSTA |
| AMERICAN MARKETING AND MANAGEMENT SERVICES, INC. | — | 19930673 D | 1992-10-16 | Suspended | KITTERY |
| AMERICAN MARKETING NETWORK, INC. | — | 19900179 D | 1989-08-10 | Suspended | PORTLAND |
| AMERICAN MARTIAL ARTS FOUNDATION | — | 19850260ND | 1985-01-21 | Active | PORTLAND |
| AMERICAN MASS TIMBER | — | 20210315 D | 2020-11-17 | Dissolved | OWLS HEAD |
| AMERICAN MASSAGE THERAPY ASSOCIATION | — | 19990027NF | 1998-12-30 | Withdrawn | AUGUSTA |
| AMERICAN MASSAGE THERAPY ASSOCIATION | — | 19850001NF | 1984-07-31 | Withdrawn | AUGUSTA |
| AMERICAN MASSAGE THERAPY ASSOCIATION | — | 20230010NF | 2022-09-08 | Active | AUGUSTA |
| AMERICAN MASSAGE THERAPY ASSOCIATION | — | 20100028NF | 2010-01-25 | Withdrawn | AUGUSTA |
| AMERICAN MATTRESS CENTERS, INC. | — | 20020275 F | 2001-09-28 | Withdrawn | AUGUSTA |
| AMERICAN MEADOWS, INC. | — | 20220364 F | 2021-10-15 | Withdrawn | CHELSEA |
| AMERICAN MEAT AND SEAFOOD, INC. | — | 19850310 D | 1984-09-13 | Active | NAPLES |
| AMERICAN MECHANICAL & PLUMBING, INC. | — | 20061723 D | 2006-03-16 | Active | South Portland |
| AMERICAN MECHANICAL SERVICES OF MAINE, INC. | — | 19980122 D | 1997-07-18 | Dissolved | PORTLAND |
| AMERICAN MEDIA ARTS CORPORATION | — | 20111198 D | 2011-05-26 | Dissolved | SOUTH BERWICK |
| AMERICAN MEDIA CORPORATION | — | 19922130 D | 1992-06-05 | Suspended | PORTLAND |
| AMERICAN MEDIA PARTNERS, INC. | — | 19990252 D | 1998-08-07 | Dissolved | PORTLAND |