| MOUNT IDA PROPERTIES LIMITED | Registered | NZ Limited Company | 1275364 | councillor interest |
| Mount MacDonald Farm Limited | Unknown | - | - | kanoa recipients |
| Mount Maunganui Lifeguard Service | Registered | Incorporated Society | - | corporate donations |
| Mount Maunganui Lifeguard Services | Unknown | - | - | councillor interest |
| Mount Maunganui Lifeguard Services Development Committee | Unknown | - | - | councillor interest |
| Mount Pleasant Pottery Group | Registered | Incorporated Society | - | government contract suppliers |
| Mountain to Sea Trust | Unknown | - | - | councillor interest |
| Mountain Valley Honey Limited Partnership | Registered | Limited Partnership (NZ) | - | iwi subsidiaries |
| Mountains to Sea Partnership | Unknown | - | - | councillor interest |
| MOUNTFIELD INVESTMENTS LIMITED | Removed | NZ Limited Company | 55813 | |
| Moutere Hills Recreation Reserve/Community Centre Committee | Unknown | - | - | councillor interest |
| Movember | Registered | Charitable Trust | - | corporate donations |
| MOVING MOUNTAINS NZ LIMITED | Registered | NZ Limited Company | 3414151 | government contract suppliers |
| MPOWER GROUP LIMITED | Removed | NZ Limited Company | 1246199 | councillor interest |
| MPOWER LIMITED | Removed | NZ Limited Company | 3415371 | government contract suppliers |
| MPT Manaaki Ora | Unknown | - | - | government contract suppliers |
| MR FOUREYES LIMITED | Registered | NZ Limited Company | 3788897 | government contract suppliers |
| Mr Sanders pop-up restaurant | Unknown | - | - | corporate donations |
| MRCAGNEY (NZ) LIMITED | Registered | NZ Limited Company | 7771198 | government contract suppliers |
| MRF 2000 LIMITED | Registered | NZ Limited Company | 1050707 | government contract suppliers |
| MRL Power Solutions Ltd | Unknown | - | - | government contract suppliers |
| MS CIVIL CONSTRUCTION LIMITED | Registered | NZ Limited Company | 6305069 | government contract suppliers |
| MSC23 LIMITED | Registered | NZ Limited Company | 1023729 | councillor interest |
| Mt Aspiring College Foundation | Registered | Charitable Trust | - | councillor interest |
| Mt Barker Residents Association | Registered | Incorporated Society | - | councillor interest |
| Mt Lyford Holiday Homes | Registered | NZ Limited Company | - | councillor interest |
| Mt Pokaka Timber Pro Limited | Unknown | - | - | political donors |
| MTL NZ LIMITED | Registered | NZ Limited Company | 6044168 | government contract suppliers |
| MTM GEO LIMITED | Registered | NZ Limited Company | 828068 | |
| MTW services | Registered | Sole Trader | - | government contract suppliers |
| Muaupoko Tribal Authority | Registered | Incorporated Society | - | government contract suppliers |
| Muaūpoko Tribal Authority | Unknown | - | - | councillor interest |
| MUDGWAY CONSTRUCTION LIMITED | Registered | NZ Limited Company | 1422927 | government contract suppliers |
| MUIRBANK HOLDINGS LIMITED | Registered | NZ Limited Company | 8126627 | government contract suppliers |
| Muller Molloy Trust | Unknown | - | - | mp interest |
| Multi Civil Contractors Ltd | Unknown | - | - | government contract suppliers |
| Multi Consultants & Personnel Ltd T/A Alignz Recruitment | Unknown | - | - | kanoa recipientsgovernment contract suppliers |
| Multi Market Services New Zealand Limited (MMSNZ) T/A Saatchi & Saatchi T/A Starcom | Unknown | - | - | government contract suppliers |
| MULTI-MEDIA SYSTEMS LIMITED | Registered | NZ Limited Company | 93083 | government contract suppliers |
| MULTIBUILD SCHWASS LIMITED | Registered | NZ Limited Company | 3481651 | government contract suppliers |
| Multicultural Association of Hawke's Bay | Unknown | - | - | councillor interest |
| Multicultural Nelson | Unknown | - | - | corporate donations |
| Multicultural Nelson Tasman festival | Unknown | - | - | corporate donations |
| Multiethnic Young Leaders NZ (MYLN) | Registered | Charitable Trust | - | corporate donations |
| Multimedia Communications | Registered | NZ Limited Company | - | government contract suppliers |
| MULTIPLE APPLICATIONS LIMITED | Removed | NZ Limited Company | 295511 | government contract suppliers |
| Multiple suppliers | Unknown | - | - | government contract suppliers |
| Multiple Trustee Companies | Unknown | - | - | councillor interest |
| Multisport Surfaces Ltd | Unknown | - | - | government contract suppliers |
| Mulvey Family Trust | Unknown | - | - | councillor interest |
