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| MASS. UNI-ENERGY SYSTEMS INC. | — | 000190658 | 1983-02-14 | Inactive | SPRINGFIELD |
| MASSA AND POZZUTO LLC | — | 000723437 | 2000-10-03 | Inactive | SPRINGFIELD |
| MASSACHUSETTS ACID CLEANING & PASSIVATING COMPANY,INC. | — | 042709301 | 1979-06-28 | Inactive | SPRINGFIELD |
| MASSACHUSETTS ADULT SOCCER ASSOCIATION, INC. | — | 001001186 | 2009-04-30 | Active | SPRINGFIELD |
| MASSACHUSETTS ADVENT CHRISTIAN CONFERENCE INC. | — | 666002662 | 1923-04-28 | Active | SPRINGFIELD |
| MASSACHUSETTS ALAS, INC. | — | 001264627 | 2017-03-17 | Inactive | SPRINGFIELD |
| MASSACHUSETTS ASSOCIATION OF CONTRIBUTORY RETIREMENT SYSTEMS, INC. | — | 237411603 | 1971-02-25 | Active | SPRINGFIELD |
| MASSACHUSETTS ASSOCIATION OF MINISTERS WIVES AND MINISTERS WIDOWS, INC. | — | 001636765 | 2023-02-11 | Active | SPRINGFIELD |
| MASSACHUSETTS ASSOCIATION OF PARTNERS IN EDUCATION, INC. | — | 223002945 | 1982-07-09 | Inactive | SPRINGFIELD |
| MASSACHUSETTS AUDIO VISUAL EQUIPMENT CORP.,OF SPRINGFIELD | — | 042715694 | 1982-10-14 | Inactive | SPRINGFIELD |
| MASSACHUSETTS BALLET COMPANY, INC. | — | 000009277 | 1974-04-01 | Inactive | SPRINGFIELD |
| MASSACHUSETTS BRASS ENSEMBLE, INCORPORATED | — | 222533538 | 1984-04-17 | Inactive | SPRINGFIELD |
| MASSACHUSETTS BURGLAR & FIRE ALARM ASSOCIATION, WESTERN * | — | 222700028 | 1985-10-03 | Inactive | SPRINGFIELD |
| MASSACHUSETTS CANNABIS BUSINESS NETWORK INC | — | 001355452 | 2018-11-16 | Inactive | SPRINGFIELD |
| MASSACHUSETTS CANNABIS REHABILITATION, INC. | — | 001139634 | 2014-06-18 | Inactive | SPRINGFIELD |
| MASSACHUSETTS CAREER DEVELOPMENT INSTITUTE, INCORPORATED,THE | — | 042672603 | 1979-07-11 | Inactive | SPRINGFIELD |
| MASSACHUSETTS CENTER FOR ADVANCED DESIGN AND MANUFACTURING, INC. | — | 001016405 | 2009-11-24 | Inactive | SPRINGFIELD |
| MASSACHUSETTS CHAPTER SUDDEN INFANT DEATH SYNDROME, INC. | — | 000469713 | 1994-06-30 | Inactive | SPRINGFIELD |
| MASSACHUSETTS COMMODITY INVESTORS, LTD. | — | L86344232 | 1974-09-30 | Inactive | SPRINGFIELD |
| MASSACHUSETTS COMMONWEALTH CHAMBER OF COMMERCE, INC., THE | — | 042672605 | 1978-03-14 | Inactive | SPRINGFIELD |
| MASSACHUSETTS COMMUNITIES FOR PURE WATER,INC. | — | 042661230 | 1978-09-14 | Inactive | SPRINGFIELD |
| MASSACHUSETTS DELIVERY ASSOCIATION, INC. | — | 000905980 | 2005-09-22 | Inactive | SPRINGFIELD |
| MASSACHUSETTS DISTRIBUTING CO, INC. | — | 042315869 | 1963-08-08 | Inactive | SPRINGFIELD |
| MASSACHUSETTS EDUCATION FEDERATION LLC | — | 001311194 | 2018-02-02 | Active | SPRINGFIELD |
| MASSACHUSETTS EXTERMINATING,INC. | — | 042584583 | 1975-12-12 | Inactive | SPRINGFIELD |
| MASSACHUSETTS FASHION COUNCIL INC. | — | 001758099 | 2024-02-13 | Active | SPRINGFIELD |
| MASSACHUSETTS GREATER ECCLESIASTICAL JURISDICTION CHURCH OF GOD IN CHRIST | — | 001875321 | 2025-03-15 | Active | SPRINGFIELD |
| MASSACHUSETTS INDEPENDENT LABORA,ASS.,INC. | — | 000004939 | 1975-12-11 | Inactive | SPRINGFIELD |
| MASSACHUSETTS INSTITUTE OF ALTERNATIVE MEDICINE, INC. | — | 043308814 | 1996-02-05 | Inactive | SPRINGFIELD |
| MASSACHUSETTS JUNIOR TENNIS LEAGUE, INC. | — | 000109382 | 1983-09-28 | Inactive | SPRINGFIELD |
| MASSACHUSETTS MINORITY CANNABIS GROWERS, INC | — | 001735909 | 2023-12-21 | Active | SPRINGFIELD |
| MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY | Finance and insurance | 041590850 | 1900-01-01 | Active | SPRINGFIELD |
| MASSACHUSETTS OFFICE OF THE CONSTABLE, WESTERN REGION INC | — | 001363532 | 2019-01-14 | Inactive | SPRINGFIELD |
| MASSACHUSETTS RE-BORN CENTER INC. | — | 043388470 | 1997-09-25 | Inactive | SPRINGFIELD |
| MASSACHUSETTS RETIRED POLICE AND FIREFIGHTERS ASSOCIATION, * | — | 043277151 | 1947-03-20 | Inactive | SPRINGFIELD |
| MASSACHUSETTS SCHOLARS WITH A GOAL INC | — | 001672987 | 2023-07-10 | Active | SPRINGFIELD |
| MASSACHUSETTS SCHOOL OF REAL ESTATE LLC | — | 001390152 | 2019-06-25 | Inactive | SPRINGFIELD |
| MASSACHUSETTS SHERIFFS ASSOCIATION, INC. | — | 000108220 | 1983-03-25 | Inactive | SPRINGFIELD |
| MASSACHUSETTS SOLAR RESOURCES, INC. | — | 000191879 | 1983-03-24 | Inactive | SPRINGFIELD |
| MASSACHUSETTS TURTLE RESCUE, INC. | — | 000759205 | 2001-06-27 | Inactive | SPRINGFIELD |
| MASSACHUSETTS VIETNAM VETERANS FOUNDATION, INC. | — | 043360913 | 1996-06-14 | Inactive | SPRINGFIELD |
| MASSACHUSETTS WHOLESALE DRUG CO. | — | 041591350 | 1968-10-30 | Inactive | SPRINGFIELD |
| MASSASOIT ASSOCIATES LIMITED PARTNERSHIP | — | L86344243 | 1985-09-12 | Inactive | SPRINGFIELD |
| MASSASOIT CONSTRUCTION CO, INC. | — | 000045749 | 1968-03-25 | Inactive | SPRINGFIELD |
| MASSASOIT ENGRAVING COMPANY | — | 041591500 | 1919-10-03 | Inactive | SPRINGFIELD |
| MASSASOIT HOTEL GP, LLC | — | 001303002 | 2017-12-13 | Active | SPRINGFIELD |
| MASSASOIT HOTEL LIMITED PARTNERSHIP | — | 001303003 | 2017-12-13 | Active | SPRINGFIELD |
| MASSASOIT MONTESSORI SOCIETY, INC. | — | 042379606 | 1980-09-24 | Inactive | SPRINGFIELD |