| Marriott International | US | — | 2 |
| Marriott International, Inc. | US | Hospitality | 2 |
| Marrs Ear, Nose & Throat, PA | US | Healthcare | 1 |
| Mars Area School District | US | — | 1 |
| Marsh McLennan | US | — | 2 |
| Marsh & McLennan Agency LLC | US | — | 1 |
| Marsh & McLennan Companies, Inc. and our affiliates | US | — | 1 |
| Marsh Properties, LLC | US | — | 1 |
| Marshall Financial Solutions, LLC | US | — | 1 |
| Marshall Medical Center | US | — | 2 |
| Marshall & Melhorn, LLC | US | — | 1 |
| Marshfield Clinic Health System | US | Healthcare | 1 |
| Marsicovetere & Levin Law Group, P.C. | US | — | 1 |
| Martellor LLC | US | — | 1 |
| Marten Transport, Ltd. | US | Transport | 1 |
| Martin Brother Distributing Company, Inc. | US | Healthcare | 1 |
| Martin Brothers Distributing Company, Inc | US | — | 1 |
| Martin & Cukjati, LLP | US | — | 2 |
| Martin Energy Group | US | — | 1 |
| Martin Energy Group Services, | US | — | 1 |
| Martin, Hutchison and Hohman, CPAs | US | — | 1 |
| Martin, Magnuson, McCarthy & Kenney | US | — | 1 |
| Martin's Inc | US | — | 1 |
| Martin Snow, LLP | US | — | 1 |
| Martin Sprocket & Gear, Inc. | US | — | 2 |
| Martinelli Winery | US | — | 1 |
| Marvel Consultants, Inc. | US | — | 1 |
| Mary B. Toporcer, MD, P.C. | US | Healthcare | 1 |
| Mary H. Makhlou, DMD, MS, PA | US | — | 1 |
| Mary Lee Foundation | US | — | 1 |
| Mary's Place | US | — | 1 |
| Maryhaven Inc. | US | — | 1 |
| Maryland Institiute College of Art | US | — | 1 |
| Marymount Manhattan College | US | — | 1 |
| Maryville Academy | US | Healthcare | 4 |
| Marywood Nursing Care Center | US | — | 1 |
| Marywood University | US | — | 1 |
| Masa NY LLC | US | — | 1 |
| Mascoma Bank | US | — | 1 |
| Mascoutah School District 19 | US | — | 1 |
| MASON LAW OFFICE, P.C. | US | — | 1 |
| Mason Tenders¶District Council | US | — | 1 |
| Mass Bay Community College | US | — | 2 |
| Mass Bay Credit Union | US | — | 1 |
| Mass. Department of Revenue | US | — | 1 |
| MASS Design Group | US | — | 1 |
| Mass General Brigham | US | — | 16 |
| Mass General Brigham Health Plan | US | — | 1 |
| Mass General Brigham (Home Care) | US | — | 1 |
| Mass General Brigham Incorporated | US | — | 1 |
| Mass General Brigham Salem | US | — | 2 |
| Mass General Hospital | US | — | 2 |
| Massachusetts Audubon Sociey, | US | — | 1 |
| Massachusetts Bankers | US | — | 1 |
| Massachusetts Bay Community | US | — | 1 |
| Massachusetts Clean Energy | US | — | 1 |
| Massachusetts College of Art and | US | — | 1 |
| Massachusetts College of Liberal | US | — | 1 |
| Massachusetts Continuining | US | — | 1 |
| Massachusetts Correctional Legal | US | — | 1 |
| Massachusetts Defined | US | — | 1 |
| Massachusetts Dental Society | US | — | 1 |
| Massachusetts Department of | US | — | 29 |
| Massachusetts Division of | US | — | 1 |
| Massachusetts Executive Office | US | — | 4 |
| Massachusetts Eye and Ear | US | — | 1 |
| Massachusetts Gaming | US | — | 1 |
| Massachusetts Gaming Commission | US | — | 1 |
| Massachusetts General Hospital | US | — | 46 |
| Massachusetts Housing | US | — | 1 |
| Massachusetts, Inc. d/b/a Brown | US | — | 1 |
| Massachusetts Institute of | US | — | 1 |
| Massachusetts Institute of Technology | US | — | 1 |
| Massachusetts, LLC dba Compassus - | US | — | 1 |
| Massachusetts Maritime | US | — | 1 |
| Massachusetts Mutual Life | US | — | 9 |
| Massachusetts Mutual Life Insurance | US | — | 1 |
| Massachusetts Mutual Life Insurance Company | US | — | 10 |
| Massachusetts Mutual Life Insurance Company ("MassMutual") | US | — | 3 |
| Massachusetts Rehabilitation | US | — | 1 |
| Massachusetts State College | US | — | 1 |
| Massachusetts State Lottery | US | — | 1 |
| Massachusetts Teachers' | US | — | 2 |
| Massachussets Mutual Life Insurance Company | US | — | 3 |
| Massasoit Community College | US | — | 2 |
| MassDOT | US | — | 1 |
| Massey Services, Inc. | US | — | 1 |
| MassHealth | US | — | 1 |
| Massive Media Match NV | US | — | 1 |
| MassMedicum Corp. | US | — | 1 |
| MassMutual Ascend Life Insurance Company | US | — | 1 |
| MassMutual Ascend Life Insurance Company (“MMAscend”); Annuity Investors Life Insurance Company (“AILIC”); Manhattan National Life Insurance Company (“MNL”) (Collectively, “MMA”) | US | — | 1 |
| MassMutual Federal Credit Union | US | — | 1 |
| MassMutual Life Insurance | US | — | 4 |
| MasTec | US | — | 1 |
| MasTec, Inc. | US | Manufacturing | 3 |
| Mastech Digital, Inc. | US | Professional Services | 1 |
| Master Chemical Corporation | US | — | 1 |
| Master Halco, Inc. | US | — | 1 |
| Master Medical Equipment, LLC | US | — | 1 |
| Master Millwork, LLC | US | — | 1 |
| Master Mobilelink LLC and Mobily LLC, d/b/a Mobilelink | US | — | 1 |
| MasterCard | US | — | 2 |
| MasterCorp, Inc. | US | — | 1 |
| Masterminds, Inc. | US | — | 1 |
| Mastery Charter High School | US | — | 1 |
| Mat-Su Surgical Associates, APC | US | — | 1 |
| Matador Recordings, LLC (d/b/a “Matador Direct”) | US | — | 1 |
| Matco Tools | US | — | 2 |
| Mater Dei High School | US | — | 1 |
| Maternal and Family Health Services | US | — | 2 |
| Maternity IP Holdings, LLC | US | — | 1 |
| Mathway, LLC | US | — | 1 |
| Mativ Holdings, Inc. | US | Manufacturing | 2 |
| Matrix Absence Management, | US | — | 1 |
| Matrix Medical Network | US | — | 1 |
| Matson Navigation Company | US | — | 3 |
| Matson Navigation Company, Inc. | US | — | 1 |
| Matson Navigation Company, Inc. and Horizon Lines | US | — | 1 |
| Matt Kitchie d/b/a Flagship Financial | US | — | 1 |
| Mattapan Community Health | US | — | 3 |
| Mattek Corporation | US | — | 1 |
| Mattress Insider, LLC | US | — | 1 |
| Mattson Technology, Inc. | US | — | 3 |
| Mauch Chunk Trust Company | US | — | 1 |
| Maumee Express Inc. | US | — | 1 |
| Mauser Packaging Solutions | US | — | 1 |
| Maverick County, Texas | US | — | 1 |
| Max-Tech, Inc. | US | — | 1 |
| MAX USA CORP. | US | — | 1 |
| Maxar Space LLC and Maxar Space Robotics LLC | US | — | 1 |
| Maxava LLC | US | — | 1 |
| Maxco Supply, Inc. | US | — | 1 |
| Maxim Healthcare Group | US | — | 2 |
| Maximum Quality Foods, Inc. | US | — | 1 |
| Maximus, Inc. | US | Professional Services | 6 |
| Maximus, Inc and its subsidiaries | US | — | 1 |
| Maximus, Inc. (Maximus Health Services, Inc.) | US | — | 1 |
| Maximus US Services Inc | US | — | 1 |
| MaxLinear, Inc. | US | Technology | 2 |
| May Institute | US | — | 4 |
| May, Potenza, Baran & Gillespie, P.C. | US | — | 1 |
| May Trucking Company | US | — | 1 |
| Maynard Select, LLC | US | — | 1 |
| Mayo Clinic | US | — | 1 |
| Mayor’s Office for Policing and Crime (MOPAC) | GB | — | 1 |
| Mazzola Mardon, P.C. | US | Healthcare | 1 |
| MB MT Acquisitions, LLC | US | — | 1 |
| MBE CPAs, LLP | US | — | 1 |
| MBS Textbook Exchange, LLC | US | — | 1 |
| MC Group Ventures Corporation | US | — | 1 |
| McAdam Financial Group | US | — | 1 |
| McAlester Regional Health Center | US | — | 1 |
| McAlister¶s Corporation, Moe¶s | US | — | 1 |
| McAlister’s Corporation, Moe’s Stores LLC, Schlotzsky’s Stores LLC, as well as entities that are franchisees | US | — | 1 |
| McAllen Surgical Specialty | US | — | 1 |
| McArthur Glen Europe Inc. | US | — | 1 |
| MCBS, LLC | US | Healthcare | 2 |
| McCabe & Associates | US | — | 1 |
| McCarter & English LLP | US | — | 1 |
| McCarthy Fingar, LLP | US | — | 1 |
| McCarthy & Holthus LLP | US | — | 1 |
| McCathern PLLC | US | — | 1 |
| McCauley & Associates, LLC | US | — | 1 |
| McClallen Law | US | — | 1 |
| McClarty Farms LLC | US | — | 1 |
| McClean Hospital | US | — | 1 |
| McCord LLC | US | — | 1 |
| McCoy Consulting Services, LLC | US | — | 1 |
| McCoyd, Parkas, & Ronan LLP | US | — | 1 |
| McCracken Financial Solutions Corp. | US | — | 1 |
| Mcdavid, Inc. | US | — | 1 |
| McDermott Will & Emery LLP | US | — | 1 |
| McDermott Will & Schulte LLP | US | — | 1 |
| McDermott Will & Schulte LLP | US | Healthcare | 1 |
| McDonald Keohane Funeral Home | US | — | 1 |
| McDougall & Sons, Inc. | US | — | 3 |
| McEwen and Associates, Inc. | US | — | 1 |
| McEwen & Associates | US | Healthcare | 1 |
| McFadyen Consulting Group | US | — | 1 |
| MCG Health, LLC | US | — | 1 |
| MCG, LLC | US | — | 1 |
| McGrath RentCorp | US | Professional Services | 2 |
| McIntosh Laboratory, Inc. | US | — | 1 |
| McKay Wealth Management | US | — | 1 |
| McKell Financial Group | US | — | 2 |
| McKenzie Creative Brands | US | — | 2 |
| McKenzie Memorial Hospital | US | Healthcare | 1 |
| McKim & Creed, Inc. | US | — | 1 |
| McKinney & Company | US | — | 1 |
| McKissock Investment Holdings, | US | — | 2 |
| McLanahan Corporation | US | — | 1 |
| McLane Middleton | US | — | 1 |
| McLaren | US | — | 1 |
| McLaren Health Care | US | Healthcare | 3 |
| McLaughlin Financial Consulting | US | — | 1 |
| McLaughlin & Stern LLP | US | — | 1 |
| McLean Hospital | US | — | 5 |
| McLean Mortgage Corporation | US | — | 2 |
| McLeod Express, LLC | US | — | 1 |