| MAJR Financial Corp | 107 | 0 | 96.3% | Credit reporting, credit repair services, or other personal consumer reports |
| Makes Cents, Inc. dba Advance.Cash | 44 | 21 | 100% | Payday loan, title loan, personal loan, or advance loan |
| Makower Abbate Guerra Wegner Vollmer PLLC | 14 | 2 | 100% | Debt collection |
| Malcolm S. Gerald and Associates, Inc. | 73 | 0 | 68.5% | Debt collection |
| Malen & Associates, p.c. | 104 | 28 | 88.5% | Debt collection |
| Man-Data Inc. | 13 | 0 | 7.7% | Debt collection |
| Managed Recovery Systems, Inc. | 14 | 4 | 92.9% | Debt collection |
| Mandarich Law Group, LLP | 500 | 131 | 99.2% | Debt collection |
| Manhattan Beach Venture, LLC | 157 | 33 | 12.7% | Student loan |
| Mankin Law Group | 11 | 2 | 45.5% | Debt collection |
| Manley Deas & Kochalski LLC | 21 | 1 | 95.2% | Debt collection |
| Mann Financial Inc. | 16 | 0 | 81.3% | Mortgage |
| Manor Resources, LLC | 11 | 0 | 36.4% | Payday loan, title loan, or personal loan |
| Mar Joe Enterprises | 145 | 10 | 93.1% | Debt collection |
| Marauder Corporation | 265 | 147 | 5.7% | Debt collection |
| Marcadis Singer PA | 48 | 19 | 100% | Debt collection |
| Marine One Acceptance Corporation | 34 | 17 | 88.2% | Credit reporting or other personal consumer reports |
| Mariner Finance, LLC | 2,424 | 581 | 99.7% | Credit reporting or other personal consumer reports |
| Mark A. Kirkorsky, PC | 35 | 2 | 77.1% | Debt collection |
| Markoff Law LLC | 51 | 9 | 98% | Debt collection |
| MarkOne Holdings, LLC | 57 | 5 | 36.8% | Consumer Loan |
| Marlette Funding, LLC | 1,039 | 347 | 97.7% | Credit reporting or other personal consumer reports |
| Mary Jane M. Elliott, P.C. Attorneys At Law | 58 | 4 | 100% | Debt collection |
| Mas Financial Services, Inc. | 91 | 15 | 74.7% | Vehicle loan or lease |
| Massachusetts Educational Financing Authority | 185 | 13 | 97.8% | Student loan |
| Massachusetts Housing Finance Agency (MassHousing) | 30 | 0 | 83.3% | Mortgage |
| Master Finance Company | 16 | 3 | 75% | Debt collection |
| Mathew Aaron Holdings Inc. | 27 | 12 | 96.3% | Debt or credit management |
| Matthew Thomas & Associates LLC | 18 | 0 | 50% | Debt collection |
| Maury Cobb, Attorney at Law, LLC | 278 | 36 | 100% | Debt collection |
| Maximum Title Loans, LLC | 26 | 0 | 61.5% | Payday loan, title loan, or personal loan |
| Maximus Federal Services, Inc. | 10,610 | 4,315 | 100% | Student loan |
| Maxitransfers LLC | 11 | 2 | 100% | Money transfer, virtual currency, or money service |
| Mb Financial, Inc. | 173 | 0 | 79.2% | Mortgage |
| Mcburberod Financial, Inc. d/b/a SeedFi | 131 | 5 | 95.4% | Credit reporting, credit repair services, or other personal consumer reports |
| McCalla Raymer Leibert Pierce, LLC | 188 | 27 | 59.6% | Debt collection |
| McCarthy & Holthus, LLP | 37 | 5 | 100% | Debt collection |
| McCarthy, Burgess & Wolff, Inc. | 823 | 118 | 99.9% | Debt collection |
| Mccue Mortgage Company, the | 25 | 1 | 96% | Mortgage |
| McCullough Payne & Haan, LLC | 51 | 0 | 82.4% | Debt collection |
| McKellar & Associates Group, Inc. | 34 | 0 | 94.1% | Debt collection |
| McKenzie Management LLC | 34 | 15 | 0% | Money transfer, virtual currency, or money service |
| McKenzie Paul & Associates | 33 | 7 | 90.9% | Debt collection |
| Mclean Mortgage Corporation | 24 | 1 | 91.7% | Mortgage |
| MCMC Auto LTD | 64 | 22 | 96.9% | Vehicle loan or lease |
| McNeil & Meyers Asset Management Group, LLC | 124 | 42 | 96.8% | Debt collection |
| Mcs Mortgage Bankers, Inc. | 13 | 0 | 76.9% | Mortgage |
| Mct Group Inc. | 22 | 14 | 100% | Debt collection |
| MCU Holdings, LLC | 23 | 4 | 100% | Debt collection |
| Meade & Associates, Inc. | 247 | 8 | 88.3% | Debt collection |