| M SQUARED LIMITED | Registered | NZ Limited Company | 618546 | government contract suppliers |
| M T Turner Trust | Unknown | - | - | councillor interest |
| M W LISSETTE LIMITED | Registered | NZ Limited Company | 164952 | government contract suppliers |
| M.A.D CONSERVATION SERVICES LIMITED | Registered | NZ Limited Company | 8354343 | government contract suppliers |
| M.B.Brown Ltd | Unknown | - | - | government contract suppliers |
| M.H. Bayly Trust | Unknown | - | - | mp interest |
| M.H.D.M. LIMITED | Removed | NZ Limited Company | 438307 | |
| M.I.L.K. LIMITED | Removed | NZ Limited Company | 940104 | political donors |
| M.T.V. LIMITED | Registered | NZ Limited Company | 825356 | government contract suppliers |
| M2S2 LIMITED | Registered | NZ Limited Company | 2452628 | councillor interest |
| m3 Contracting | Unknown | - | - | government contract suppliers |
| MA Capital Ltd via Ross George | Unknown | - | - | political donors |
| MA HARRISON TRUSTEE LIMITED | Removed | NZ Limited Company | 6928615 | government contract suppliers |
| MA Investments Two Ltd via Ross George | Unknown | - | - | political donors |
| MAAHINA LIMITED | Registered | - | - | |
| MAAKA DEVELOPMENTS LIMITED | Removed | - | - | |
| Maakirikiri Aggregated Land Trust | Unknown | - | - | mp interest |
| Maakirikiri Maori Aggregated Land Trust | Unknown | - | - | mp interest |
| MAARA MOANA HC LIMITED | Registered | NZ Limited Company | 6872915 | iwi subsidiaries |
| Maara Moana Holding Company | Unknown | - | - | iwi subsidiaries |
| MAARA MOANA LIMITED | Removed | NZ Limited Company | 1377099 | iwi subsidiaries |
| Maara Moana Limited Partnership | Registered | Limited Partnership (NZ) | - | iwi subsidiaries |
| MAAT CONSULTING LIMITED | Registered | - | - | |
| Maataa Waka Ki Te Tau Ihu Trust | Registered | Charitable Trust | - | government contract suppliers |
| MAATUA WAHINE TRUST LIMITED | Registered | NZ Limited Company | 8210611 | mp interest |
| Mabonga Family Trust | Registered | Trust | - | councillor interest |
| MAC TRUSTEE 2021 LIMITED | Registered | NZ Limited Company | 8164199 | councillor interest |
| Maca Sports Leadership Charitable Trust | Registered | Charitable Trust | - | government contract suppliers |
| Macalister Mazengarb Solicitors | Unknown | - | - | government contract suppliers |
| MACBID LIMITED | Registered | NZ Limited Company | 9302456 | government contract suppliers |
| MACDONALD CONSULTANCY LIMITED | Registered | NZ Limited Company | 7350438 | councillor interest |
| MACDONALD CONSULTING LIMITED | Removed | NZ Limited Company | 652263 | councillor interest |
| MACHIKO MAMA TRUSTEE LIMITED | Registered | NZ Limited Company | 8177735 | councillor interest |
| MACHINERY IMPORTATION AUSTRALASIA LIMITED | Registered | NZ Limited Company | 7569656 | kanoa recipients |
| MacKenzie Construction 2015 Ltd | Unknown | - | - | councillor interest |
| MACKIE RESEARCH & CONSULTING LIMITED | Registered | NZ Limited Company | 2399788 | government contract suppliers |
| MACLEAN TRUSTEES 2021 LIMITED | Registered | NZ Limited Company | 8260493 | councillor interest |
| MacLeod Holding Trust | Unknown | - | - | mp interest |
| MACMILLAN LIMITED | Registered | - | - | |
| MACMURRAY INSTITUTE LIMITED | Registered | NZ Limited Company | 2113049 | government contract suppliers |
| MACO PHARMA AUSTRALIA PTY LIMITED | Removed | Overseas ASIC Company | 1626455 | government contract suppliers |
| Macpac New Zealland Ltd | Unknown | - | - | government contract suppliers |
| MACQUARIE ASSET MANAGEMENT (NZ) LIMITED | Registered | NZ Limited Company | 461290 | fund managers |
| MACQUARIE BANK LIMITED | Removed | - | - | |
| MACQUARIE CAPITAL (NEW ZEALAND ) LIMITED | Registered | NZ Limited Company | 1952567 | government contract suppliers |
| MACQUARIE GROUP NEW ZEALAND LIMITED | Removed | NZ Limited Company | 245979 | mp interestfund managers |
| MACRO CONSTRUCTION LIMITED | Registered | NZ Limited Company | 8256451 | government contract suppliers |
| MAD GROUP LIMITED | Registered | NZ Limited Company | 3150885 | government contract suppliers |
| Made in Te Puke Trust | Registered | Charitable Trust | - | councillor interest |
| MADGE COACHLINES LIMITED | Removed | NZ Limited Company | 1460 | government contract suppliers |