| Mortgage Clearing Corporation | 25 | 0 | 100% | Mortgage |
| Mortgage Firm, Inc., the | 24 | 2 | 95.8% | Mortgage |
| Mortgage Investors Corporation | 78 | 0 | 73.1% | Mortgage |
| Mortgage Investors Group | 14 | 1 | 85.7% | Mortgage |
| Mortgage Lenders Investment Trading Corp | 98 | 6 | 98% | Mortgage |
| Mortgage Lenders of America | 36 | 0 | 83.3% | Mortgage |
| Mortgage One Funding LLC | 11 | 3 | 100% | Mortgage |
| Mortgage Research Center, LLC | 593 | 106 | 100% | Mortgage |
| Mortgage Solutions of Colorado | 197 | 65 | 95.9% | Mortgage |
| MortgagePros, LLC | 45 | 31 | 100% | Mortgage |
| Moss Law Firm, P.C. | 88 | 19 | 98.9% | Debt collection |
| Motolease, LLC | 67 | 0 | 73.1% | Credit reporting, credit repair services, or other personal consumer reports |
| Motormax Financial Services Inc. | 10 | 0 | 60% | Credit reporting or other personal consumer reports |
| Mountain America Federal Credit Union | 634 | 251 | 99.8% | Checking or savings account |
| Mountain Land Collections, Inc. | 229 | 62 | 97.8% | Debt collection |
| Mountain Run Solutions, LLC | 325 | 0 | 97.5% | Debt collection |
| Mountain West Financial, LLC | 40 | 0 | 95% | Mortgage |
| Movement Mortgage LLC | 493 | 77 | 99.6% | Mortgage |
| Moxley & Associates, LLC | 19 | 2 | 100% | Debt collection |
| MPOWER Financing, Public Benefit Corporation | 36 | 19 | 77.8% | Student loan |
| Mr. Cooper Group Inc. | 15,458 | 2,544 | 99.9% | Mortgage |
| Mrs Bpo, LLC | 2,667 | 640 | 100% | Debt collection |
| Ms Services LLC | 127 | 10 | 96.1% | Credit reporting, credit repair services, or other personal consumer reports |
| MSCB, Inc. | 46 | 13 | 100% | Debt collection |
| MST Financial Services, L.L.C. | 121 | 23 | 99.2% | Debt collection |
| MSW Capital, LLC | 41 | 1 | 87.8% | Debt collection |
| Mufg Americas Holdings Corporation | 434 | 0 | 100% | Checking or savings account |
| Mullooly Jeffrey Rooney & Flynn | 137 | 28 | 100% | Debt collection |
| Municipal Collections of America Inc. | 77 | 4 | 93.5% | Debt collection |
| Municipal Collections Services, Inc. | 55 | 9 | 92.7% | Debt collection |
| MUSA Holdings, LLC | 12 | 2 | 66.7% | Credit reporting or other personal consumer reports |
| Muskegon Car Credit, Inc. | 45 | 16 | 91.1% | Credit reporting or other personal consumer reports |
| Mutual Financial Partners | 40 | 0 | 87.5% | Debt collection |
| Mutual Management Services LLC | 163 | 51 | 100% | Debt collection |
| Mutual of Omaha Mortgage, LLC | 159 | 44 | 100% | Mortgage |
| Mvba, L.L.C. | 19 | 1 | 36.8% | Debt collection |
| N.A.R., Inc. | 329 | 49 | 93% | Debt collection |
| N26 Inc. | 90 | 1 | 100% | Checking or savings account |
| NAFCO Finance | 11 | 2 | 100% | Vehicle loan or lease |
| Nagle & Zaller, PC | 16 | 0 | 56.3% | Debt collection |
| Nair & Levin, P.C. | 25 | 1 | 92% | Debt collection |
| NAM National Arbitration and Mediation | 91 | 5 | 7.7% | Debt collection |
| Nartey Law Group, LLC | 10 | 0 | 80% | Debt collection |
| Nathan & Nathan, P.C. | 108 | 25 | 100% | Debt collection |
| National Account Services Group, LLC. | 17 | 0 | 29.4% | Debt collection |
| National Account Services, Inc. | 12 | 0 | 33.3% | Debt collection |
| National Account Systems of Omaha, LLC | 102 | 37 | 89.2% | Debt collection |
| National Arbitration Forum | 53 | 0 | 34% | Debt collection |
| National Asset Direct, Inc. | 15 | 0 | 86.7% | Mortgage |
| National Asset Mortgage, LLC | 34 | 14 | 97.1% | Mortgage |