| $350,000–1 million | MANCHESTER OBSTETRICAL ASSOCIATES ,P.A. | MANCHESTER, NH | Eastern Bank |
| $350,000–1 million | MANCHESTER UROLOGY ASSOCIATES PROFESSIONAL ASSOCIATION | MANCHESTER, NH | Eastern Bank |
| $1–2 million | MANDARIN HOUSE LLC | Saugus, MA | Eastern Bank |
| $350,000–1 million | MANDARIN HOUSE, LLC | SAUGUS, MA | Eastern Bank |
| $5–10 million | MANFI LEASING CORP. | BURLINGTON, MA | Eastern Bank |
| $150,000–350,000 | MANZI & ASSOCIATES L.L.C> | NORTH ANDOVER, MA | Eastern Bank |
| $350,000–1 million | MARATHON SPORTS INC. | Waltham, MA | Eastern Bank |
| $350,000–1 million | MARATHON SPORTS, INC. | Waltham, MA | Eastern Bank |
| $150,000–350,000 | MARC ANTHONY'S LAPIZZERIA, LTD. | ONSET, MA | Eastern Bank |
| $150,000–350,000 | MARC HALL DESIGN, LLC | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MARCEAU CONSTRUCTION CORPORATION | Methuen, MA | Eastern Bank |
| $150,000–350,000 | MARCEAU CONSTRUCTION CORPORATION | METHUEN, MA | Eastern Bank |
| $150,000–350,000 | MARCH & MARTIN INC | Marblehead, MA | Eastern Bank |
| $150,000–350,000 | MARCH & MARTIN INC. | PEABODY, MA | Eastern Bank |
| $150,000–350,000 | MARCHIONDA & ASSOCIATES | Stoneham, MA | Eastern Bank |
| $150,000–350,000 | MARCHIONDA & ASSOCIATES, LP | STONEHAM, MA | Eastern Bank |
| $350,000–1 million | MARCO RUBBER INTERMEDIATE HOLDINGS, LLC | Seabrook, NH | Eastern Bank |
| $150,000–350,000 | MARGIA CORP | Boston, MA | Eastern Bank |
| $150,000–350,000 | MARIA'S GOURMET PASTA PRODUCTS, INC. | MALDEN, MA | Eastern Bank |
| $350,000–1 million | MARINA BAY MANAGEMENT SERVICES LLC | QUINCY, MA | Eastern Bank |
| $350,000–1 million | MARIO RUSSO INC | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MARIO RUSSO INC. | Boston, MA | Eastern Bank |
| $150,000–350,000 | MARION DENTAL HEALTH ASS | Marion, MA | Eastern Bank |
| $350,000–1 million | MARION EDWARD ASSOCIATES, INC. | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MARISA MARINO INC | Boston, MA | Eastern Bank |
| $150,000–350,000 | MARISA MARINO INC | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MARSHLAND GROUP INC | Sandwich, MA | Eastern Bank |
| $350,000–1 million | MARSHLAND GROUP, INC. | SANDWICH, MA | Eastern Bank |
| $150,000–350,000 | MASC ASSOCIATES LLC | NORTH HAMPTON, NH | Eastern Bank |
| $150,000–350,000 | MASC ASSOCIATES LLC | North Hampton, NH | Eastern Bank |
| $350,000–1 million | MASS DESIGN GROUP LTD | Boston, MA | Eastern Bank |
| $350,000–1 million | MASS DESIGN GROUP LTD. | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MASS INSIGHT EDUCATION AND RESEARCH INSTITUTE, INC. | Boston, MA | Eastern Bank |
| $150,000–350,000 | MASS MENTORING PARTNERSHIP | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MASS POLYMERS CORPORATION | Bridgewater, NJ | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS ADOPTION RESOURCE EXCHANGE | Newton, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS ADVOCATES FOR CHILDREN | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS ANIMAL MEDICAL CENTER, LLC | WATERTOWN, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS ASSOCIATION OF SCHOOL COMMITTEES, INC. | BOSTON, MA | Eastern Bank |
| $1–2 million | MASSACHUSETTS AUDIO VISUAL EQUIPMENT CORPORATION | TEWKSBURY, MA | Eastern Bank |
| $1–2 million | MASSACHUSETTS AUDIO VISUAL EQUIPMENT CORPORATION | Tewksbury, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS BUDGET & POLICY CENTER INC | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MASSACHUSETTS ENVELOPE COMPANY INC | Somerville, MA | Eastern Bank |
| $350,000–1 million | MASSACHUSETTS ENVELOPE COMPANY, INC. | SOMERVILLE, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS IMMIGRANT & REFUGEE ADVOCACY COALITION INC | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MASSACHUSETTS LEGAL ASSISTANCE CORPORATION | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS MEDICAL & PHYSICAL THERAPY | MELROSE, MA | Eastern Bank |
| $150,000–350,000 | MASSACHUSETTS SERVICE ALLIANCE, INC. | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MASSACHUSETTS SOCIETY OF CERTIFIED PUBLIC ACCOUNTANTS INC. | Boston, MA | Eastern Bank |
| $150,000–350,000 | MASSIMINO'S CUCINA ITALIANA INC | Boston, MA | Eastern Bank |
| $150,000–350,000 | MASSIMINO'S CUCINA ITALIANA, INC. | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MASTER, WARDENS AND MEMBERS OF THE GRAND LODGE OF MASONS IN | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MATARAZZO BROTHERS LLC | CHELSEA, MA | Eastern Bank |
| $350,000–1 million | MATIGNON HIGH SCHOOL INC | Cambridge, MA | Eastern Bank |
| $350,000–1 million | MATIGNON HIGH SCHOOL, INC. | CAMBRIDGE, MA | Eastern Bank |
| $2–5 million | MATS INC | Stoughton, MA | Eastern Bank |
| $1–2 million | MATS INC | Stoughton, MA | Eastern Bank |
| $150,000–350,000 | MATTERA RESTAURANT GROUP | Salem, MA | Eastern Bank |
| $150,000–350,000 | MATTHEW MARIES LLC | Saugus, MA | Eastern Bank |
| $150,000–350,000 | MATTHEW MARIES LLC | SAUGUS, MA | Eastern Bank |
| $1–2 million | MAXIMA CONSULTING, INC. | WAKEFIELD, MA | Eastern Bank |
| $150,000–350,000 | MAYFLOWER ADVISORS, LLC | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MCCARTHY, BOULEY, BARRY & MORGAN P.C | Waltham, MA | Eastern Bank |
| $150,000–350,000 | MCCOURT FOUNDATION INC B | Braintree, MA | Eastern Bank |
| $150,000–350,000 | MCCUE THE FLORIST, INC. | WOBURN, MA | Eastern Bank |
| $2–5 million | MCCUSKER-GILL INC | HINGHAM, MA | Eastern Bank |
| $150,000–350,000 | MCDONALD & KANYUK PLLC | CONCORD, NH | Eastern Bank |
| $350,000–1 million | MCDREAM ENTERPRISES II, LLC | WATERFORD, CT | Eastern Bank |
| $150,000–350,000 | MCGINLEY KALSOW & ASSOCIATES, INC. | Somerville, MA | Eastern Bank |
| $150,000–350,000 | MCGOVERN HOUSTON & GANEM | Boston, MA | Eastern Bank |
| $150,000–350,000 | MCGOVERN, HOUSTON AND GANEM, PC | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MCGREGOR & LEGERE P.C. | Boston, MA | Eastern Bank |
| $150,000–350,000 | MCGREGOR & LEGERE, P.C. | BOSTON, MA | Eastern Bank |
| $350,000–1 million | MCLANE RESEARCH LABORATORIES, INC. | EAST FALMOUTH, MA | Eastern Bank |
| $350,000–1 million | MCPHAIL ASSOCIATES LLC | Cambridge, MA | Eastern Bank |
| $150,000–350,000 | MCR TECHNOLOGIES INC. | ROWLEY, MA | Eastern Bank |
| $350,000–1 million | MCSWEENEY & RICCI INSURANCE AGENCY INC | BRAINTREE, MA | Eastern Bank |
| $150,000–350,000 | MDD HOSPITALITY GROUP | MIDDLEBORO, MA | Eastern Bank |
| $350,000–1 million | MDD HOSPITALITY GROUP IN | Plymouth, MA | Eastern Bank |
| $1–2 million | MEADOWBROOK SCHOOL OF WESTON, INC | WESTON, MA | Eastern Bank |
| $150,000–350,000 | MECHANICAL CONCEPTS INC | CANDIA, NH | Eastern Bank |
| $350,000–1 million | MEDI PRINT INC. | Malden, MA | Eastern Bank |
| $350,000–1 million | MEDI-PRINT INC. | MALDEN, MA | Eastern Bank |
| $150,000–350,000 | MEDI-SERVICES, INC. | ABINGTON, MA | Eastern Bank |
| $150,000–350,000 | MEDICAL TECHNICAL GASES, INC. | NORTH BILLERICA, MA | Eastern Bank |
| $350,000–1 million | MELKONIAN SUBARU INC | NORTH READING, MA | Eastern Bank |
| $150,000–350,000 | MELROSE LIBERTY BELL INC | Melrose, MA | Eastern Bank |
| $150,000–350,000 | MELROSE LIBERTY BELL INC. | MELROSE, MA | Eastern Bank |
| $350,000–1 million | MENINNO CONSTRUCTION CO INC | LYNN, MA | Eastern Bank |
| $150,000–350,000 | MERENGUE CORP | ROXBURY, MA | Eastern Bank |
| $150,000–350,000 | MERGE ARCHITECTS, INC. | BOSTON, MA | Eastern Bank |
| $150,000–350,000 | MERIDIAN ACADEMY, INC. | JAMAICA PLAIN, MA | Eastern Bank |
| $150,000–350,000 | MERIDIAN FIRE PROTECTION | Salem, NH | Eastern Bank |
| $150,000–350,000 | MERIDIAN FIRE PROTECTION INC | SALEM, NH | Eastern Bank |
| $150,000–350,000 | METALCRAFT DOOR CO. INC | Woburn, MA | Eastern Bank |
| $150,000–350,000 | METALCRAFT DOOR CO., INC. | WOBURN, MA | Eastern Bank |
| $350,000–1 million | METALSTONE TECHNOLOGIES LLC | Chelsea, MA | Eastern Bank |
| $350,000–1 million | METALSTONE TECHNOLOGIES, LLC | CHELSEA, MA | Eastern Bank |
| $150,000–350,000 | METROLOGY SERVICES COMPANY, INC. | EAST WEYMOUTH, MA | Eastern Bank |
| $1–2 million | METROPOLITAN CABINET DISTRIBUTORS CORP | Norwood, MA | Eastern Bank |