| MG & LM Montgomerie Family Trust | Unknown | - | - | councillor interest |
| MG HEALTHCARE LIMITED | Registered | NZ Limited Company | 8285160 | government contract suppliers |
| MGH JOHN ALLEN LIMITED | Removed | NZ Limited Company | 1930105 | |
| MHM AUTOMATION LIMITED | Registered | NZ Limited Company | 125412 | government contract suppliers |
| MHV WATER LIMITED | Registered | NZ Co-operative Company | 2218532 | councillor interest |
| MICHAEL BARKER CONSULTING LIMITED | Removed | NZ Limited Company | 2079665 | |
| Michael Eustace | Unknown | - | - | government contract suppliers |
| MICHAEL FORD LIMITED | Registered | NZ Limited Company | 1927767 | councillor interest |
| MICHAEL FOWLER PUBLISHING LIMITED | Registered | NZ Limited Company | 1874834 | councillor interest |
| MICHAEL GILBERT LAW LIMITED | Removed | NZ Limited Company | 1279928 | |
| Michael Gordon | Unknown | - | - | government contract suppliers |
| Michael Grey | Unknown | - | - | government contract suppliers |
| Michael Hill International Violin Competition Charitable Trust | Registered | Charitable Trust | - | mp interest |
| MICHAEL HILL NEW ZEALAND LIMITED | Registered | - | - | |
| MICHAEL HODGE LAW LIMITED | Registered | NZ Limited Company | 8262336 | |
| Michael Innes Parker & Bridget Stella Parker (for the Parker Partnership trading as Broadlands Farm) | Unknown | - | - | kanoa recipients |
| MICHAEL KAN LAW LIMITED | Registered | NZ Limited Company | 3803118 | |
| MICHAEL LAWRENCE BUILDERS LIMITED | Removed | NZ Limited Company | 424657 | |
| MICHAEL MCFADDEN EMPLOYMENT LAW SPECIALIST LIMITED | Removed | NZ Limited Company | 7512057 | |
| MICHAEL RICHARD WOOD LIMITED | Removed | NZ Limited Company | 565345 | |
| MICHAEL THOMAS LIMITED | Registered | NZ Limited Company | 8292526 | |
| Michael Webb - Barrister | Unknown | - | - | government contract suppliers |
| MICHAEL WOOD & CO LIMITED | Removed | NZ Limited Company | 64726 | |
| MICHAEL WOOD BUILDERS LIMITED | Registered | NZ Limited Company | 9008376 | |
| MICHAEL WOOD LIVESTOCK LIMITED | Removed | NZ Limited Company | 535251 | |
| Michelle Jan Reihana | Unknown | - | - | government contract suppliers |
| Michelle Mcclellan | Unknown | - | - | government contract suppliers |
| Michelle Stephanie Holt | Registered | Sole Trader | - | government contract suppliers |
| MICO NEW ZEALAND LIMITED | Registered | NZ Limited Company | 7931 | government contract suppliers |
| MICROANALYTIX NZ LIMITED | Registered | NZ Limited Company | 8189360 | government contract suppliers |
| MICROBIO SOLUTIONS LIMITED | Registered | NZ Limited Company | 8141837 | mp interest |
| MICROPICO SYSTEMS LIMITED | Registered | NZ Limited Company | 4115103 | government contract suppliers |
| MicroPico Sytems Ltd | Unknown | - | - | government contract suppliers |
| MICROSOFT NEW ZEALAND LIMITED | Registered | NZ Limited Company | 510446 | councillor interest |
| Mid Dome Wilding Pines Trust | Unknown | - | - | councillor interest |
| Mid Dome Wilding Trees Charitable Trust | Registered | Charitable Trust | - | mp interest |
| Mid Taieri Wai | Unknown | - | - | councillor interest |
| MID WEST HELICOPTERS (NZ) LIMITED | Registered | NZ Limited Company | 6250981 | councillor interest |
| MidCentral District Health Board | Registered | Central Government | - | government contract suppliers |
| Middlemore Hospital Mental Health Unit | Unknown | - | - | corporate donations |
| MIDDLEWARE NEW ZEALAND LIMITED | Registered | NZ Limited Company | 1822456 | government contract suppliers |
| Midland Cardiovascular services Ltd | Unknown | - | - | government contract suppliers |
| Midland Sexual Assault Support Services Trust | Unknown | - | - | government contract suppliers |
| MIDLANDS HEALTH NETWORK LIMITED | Registered | NZ Limited Company | 433647 | government contract suppliers |
| MIDLANDS RURAL TRANSPORT LIMITED | Registered | NZ Limited Company | 7024693 | government contract suppliers |
| MIDLANDS SEED LIMITED | Registered | NZ Limited Company | 468612 | political donors |
| Midlands Sexual Assault Support Services Trust | Registered | Charitable Trust | - | government contract suppliers |
| Midway Surf Life Saving Club (SLSC) | Unknown | - | - | kanoa recipients |
| MIEHLBRADT CONSULTING LIMITED | Registered | NZ Limited Company | 2169547 | government contract suppliers |
| Miere Hives & Stock | Unknown | - | - | iwi subsidiaries |
