| MATASH LIMITED | Registered | NZ Limited Company | 8244213 | government contract suppliers |
| MATAWAI LIMITED | Registered | NZ Limited Company | 6793194 | government contract suppliers |
| Matawhero Nursery Ltd | Unknown | - | - | government contract suppliers |
| MATAWHERO TRANSPORT LIMITED | Registered | NZ Limited Company | 1476323 | government contract suppliers |
| MATCO CIVIL CONTRACTORS LIMITED | Registered | NZ Limited Company | 6212107 | government contract suppliers |
| MATES TRAVEL LIMITED | Registered | - | - | |
| MATHS ADVENTURES LIMITED | Registered | NZ Limited Company | 1286554 | government contract suppliers |
| MATHYS LIMITED | Removed | NZ Limited Company | 1545500 | government contract suppliers |
| Matiu Taurau | Unknown | - | - | government contract suppliers |
| Matomato Farms Ltd | Unknown | - | - | councillor interest |
| MATRIX CONSULTING LIMITED | Removed | NZ Limited Company | 1283814 | political donors |
| MATRIX TRAFFIC AND TRANSPORT DATA LIMITED | Registered | NZ Limited Company | 5774772 | government contract suppliers |
| MATT CROCKETT TRUSTEE LIMITED | Registered | NZ Limited Company | 8078562 | |
| Matt Fitzmaurice | Unknown | - | - | government contract suppliers |
| MATT GRIFFIN BUILDERS LIMITED | Removed | NZ Limited Company | 1800979 | |
| MATT GRIFFINS ARTWORK LIMITED | Registered | NZ Limited Company | 9246477 | |
| MATT WONG CONSULTING LIMITED | Removed | NZ Limited Company | 1923614 | |
| MATTHEW AND REBECCA TRUSTEES LIMITED | Registered | NZ Limited Company | 9032753 | |
| MATTHEW ANDERSON CONSTRUCTION LIMITED | Registered | NZ Limited Company | 8106563 | |
| Matthew Orange | Unknown | - | - | government contract suppliers |
| MATTR LIMITED | Registered | NZ Limited Company | 7615298 | government contract suppliers |
| MATU FAMILY TRUST LIMITED | Removed | NZ Limited Company | 917406 | councillor interest |
| MATUI LIMITED | Registered | NZ Limited Company | 7924885 | government contract suppliers |
| Matuku Link Reserve | Unknown | - | - | corporate donations |
| MAUAO TRUSTEE LIMITED | Registered | NZ Limited Company | 6959195 | councillor interest |
| MAUGERS CONTRACTING LIMITED | Registered | NZ Limited Company | 138193 | councillor interest |
| MAUGERS GARAGE LIMITED | Registered | NZ Limited Company | 124143 | councillor interest |
| Maunga Hikurangi | Registered | Sole Trader | - | iwi subsidiaries |
| Maunga Hikurangi Tourism | Unknown | - | - | iwi subsidiaries |
| Maungaharuru-Tangitū Trust | Unknown | - | - | kanoa recipients |
| MAUNGATAPERE SERVICE STATION (2001) LIMITED | Removed | NZ Limited Company | 1138412 | councillor interest |
| Maungatautari Eco Trust | Unknown | - | - | kanoa recipients |
| Maungatautari to Pirongia Ecological Corridor Society | Unknown | - | - | councillor interest |
| Maungaturoto Community Charitable Trust Inc | Unknown | - | - | kanoa recipients |
| Maungaturoto Country Club | Unknown | - | - | councillor interest |
| Maungaturoto Hall | Unknown | - | - | councillor interest |
| Mauri O Te Moana Charitable Trust | Registered | Charitable Trust | - | mp interest |
| MAURI TUI TUIA LIMITED | Registered | NZ Limited Company | 8246513 | government contract suppliers |
| MAURI WHANAU LIMITED | Registered | NZ Limited Company | 5875627 | government contract suppliers |
| Maurice Carter Charitable Trust | Registered | Charitable Trust | - | mp interest |
| Mautner Family Trust | Unknown | - | - | councillor interest |
| MAVEN BOP LIMITED | Registered | NZ Limited Company | 6210347 | government contract suppliers |
| MAVEN CONSULTING LIMITED | Registered | NZ Limited Company | 916144 | government contract suppliers |
| MAVEN SOUTH LIMITED | Registered | NZ Limited Company | 6651753 | government contract suppliers |
| MAVEN WAIKATO LIMITED | Registered | NZ Limited Company | 8541966 | government contract suppliers |
| MAVtech | Unknown | - | - | councillor interest |
| MAVtech Trust | Unknown | - | - | councillor interest |
| MAX 433 TRUSTEE LIMITED | Registered | NZ Limited Company | 2117213 | mp interest |
| MAX MCKENZIE LIMITED | Registered | NZ Limited Company | 187285 | government contract suppliers |
| MAX STYLE LIMITED | Registered | NZ Limited Company | 6910554 | government contract suppliers |