| MIERS CONTRACTORS (1995) LIMITED | Registered | NZ Limited Company | 4502278 | government contract suppliers |
| MIERS CONTRACTORS LIMITED | Registered | NZ Limited Company | 4396223 | government contract suppliers |
| MIGHTY RIVER POWER LIMITED | Registered | NZ Limited Company | 5734712 | councillor interest |
| MIHALJEVICH TRUSTEE LIMITED | Registered | NZ Limited Company | 8869973 | councillor interest |
| MIhis Place | Registered | Sole Trader | - | government contract suppliers |
| MIKE BRUIN BUILDING LIMITED | Registered | NZ Limited Company | 1496839 | government contract suppliers |
| MIKE DAVIDSON CONSTRUCTION LIMITED | Removed | NZ Limited Company | 1052012 | |
| MIKE EDRIDGE CONTRACTING LIMITED | Registered | NZ Limited Company | 680786 | government contract suppliers |
| Mike Flood-Smith | Unknown | - | - | government contract suppliers |
| MIKE GREER COMMERCIAL LIMITED | Registered | NZ Limited Company | 4463659 | government contract suppliers |
| Mike Harding Environmental Consultant | Unknown | - | - | government contract suppliers |
| Mike Hurring Logging | Unknown | - | - | government contract suppliers |
| Mike Jillings | Unknown | - | - | government contract suppliers |
| MIKE KING ARCHITECTURAL SERVICES LIMITED | Removed | NZ Limited Company | 1620718 | |
| MIKE KING CARTAGE CONTRACTOR LIMITED | Removed | NZ Limited Company | 906394 | |
| MIKE KING ELECTRICAL LIMITED | Removed | NZ Limited Company | 2205717 | |
| MIKE KING LIMITED | Removed | NZ Limited Company | 1199870 | |
| MIKE KING TOUR LIMITED | Removed | NZ Limited Company | 1245990 | |
| MIKE KINGAN BUILDERS LIMITED | Registered | NZ Limited Company | 1974904 | |
| MIKE LEE CONSULTING LIMITED | Removed | NZ Limited Company | 6250869 | |
| MIKE PARKER BUILDERS LIMITED | Registered | NZ Limited Company | 2078496 | government contract suppliers |
| MIKE SABIN LIMITED | Removed | NZ Limited Company | 1742283 | |
| Mike Worsp | Unknown | - | - | government contract suppliers |
| MILDARA DAIRY LIMITED | Registered | NZ Limited Company | 1617451 | councillor interest |
| MILDARA PASTURES LIMITED | Registered | NZ Limited Company | 9374319 | councillor interest |
| MILES ANDERSON AGRICULTURAL LIMITED | Removed | NZ Limited Company | 430186 | |
| MILES CONSTRUCTION LIMITED | Registered | NZ Limited Company | 1874476 | government contract suppliers |
| MILES GROUP (2024) LIMITED | Registered | NZ Limited Company | 1020980 | |
| MILFORD ASSET MANAGEMENT LIMITED | Registered | NZ Limited Company | 1427168 | fund managers |
| MILFORD SOUND TOURISM LIMITED | Registered | NZ Limited Company | 494944 | kanoa recipients |
| MILFORD SOUNDS LIMITED | Removed | NZ Limited Company | 440739 | kanoa recipients |
| Milky Way Trust | Unknown | - | - | councillor interest |
| MILL VALLEY LIMITED | Registered | NZ Limited Company | 5792789 | councillor interest |
| MILLARS ELECTRICAL CONTRACTORS LIMITED | Registered | NZ Limited Company | 341539 | government contract suppliers |
| Millenium Science New Zealand Pty Ltd | Unknown | - | - | government contract suppliers |
| Millennium Electrical | Unknown | - | - | government contract suppliers |
| MILLENNIUM GROUP (NZ) PTY LIMITED | Registered | NZ Limited Company | 5702162 | government contract suppliers |
| MILLENNIUM GROUP NEW ZEALAND LIMITED | Removed | NZ Limited Company | 892784 | government contract suppliers |
| MILLENNIUM SCIENCE (NEW ZEALAND) PTY LIMITED | Registered | NZ Limited Company | 1882647 | government contract suppliers |
| MILLER INVESTMENTS LIMITED | Removed | NZ Limited Company | 315339 | |
| MILLER POULGRAIN TRUSTEES (MIB JAMES) LIMITED | Registered | NZ Limited Company | 6502552 | |
| MILLERS FLAT BUS COMPANY LIMITED | Registered | NZ Limited Company | 6029408 | government contract suppliers |
| MILLIKEN (AUSTRALIA) PTY LTD | Registered | Overseas ASIC Company | 5699870 | government contract suppliers |
| MILLS ALBERT LIMITED | Registered | NZ Limited Company | 1079001 | government contract suppliers |
| MILMINE HOLDINGS LIMITED | Registered | NZ Limited Company | 7680156 | councillor interest |
| MILNEPM LIMITED | Registered | NZ Limited Company | 4165142 | government contract suppliers |
| MILTON HARWARD CONSTRUCTION LIMITED | Registered | NZ Limited Company | 115538 | government contract suppliers |
| MINARET PROPERTY INVESTMENTS LIMITED | Registered | - | - | |
| MIND GARAGE LIMITED | Registered | NZ Limited Company | 8615467 | government contract suppliers |
| MIND MATTERS PSYCHOLOGY LIMITED | Registered | NZ Limited Company | 1594183 | government contract suppliers |