| MCCONNELL DOWELL CONSTRUCTORS LIMITED | Registered | NZ Limited Company | 78238 | government contract suppliers |
| MCCONNELL DOWELL CONSTRUCTORS LIMITED TRADING AS BUILT ENVIRONS | Unknown | - | - | government contract suppliers |
| MCCORMACK GROUP LIMITED | Registered | NZ Limited Company | 1955530 | government contract suppliers |
| MCCOY AND WIXON ARCHITECTS LIMITED | Registered | NZ Limited Company | 808889 | government contract suppliers |
| MCCULLY CONSULTING GROUP LIMITED | Registered | - | - | |
| MCDONALD FENCING & CONSTRUCTION LIMITED | Registered | NZ Limited Company | 6813573 | government contract suppliers |
| MCDONOUGH CONTRACTING LIMITED | Registered | NZ Limited Company | 1108009 | government contract suppliers |
| McFelin Family Trust | Unknown | - | - | councillor interest |
| MCGINTYS NATIONWIDE TOWING LIMITED | Registered | NZ Limited Company | 846544 | government contract suppliers |
| MCGIVEN VENTURES LIMITED | Registered | NZ Limited Company | 1608364 | councillor interest |
| MCGLINN CONSULTING GROUP LIMITED | Registered | NZ Limited Company | 5875049 | councillor interest |
| MCGLINN TRUSTEE SERVICES LIMITED | Registered | NZ Limited Company | 5712407 | councillor interest |
| MCGRAW-HILL EDUCATION (AUSTRALIA) PTY LTD | Registered | Overseas ASIC Company | 8276061 | government contract suppliers |
| McGredy Winder Co. Ltd | Unknown | - | - | government contract suppliers |
| McGregor Construction LTD 2015 | Unknown | - | - | government contract suppliers |
| MCGUINNESS INSTITUTE LIMITED | Registered | - | - | |
| MCHALE GROUP LIMITED | Registered | NZ Limited Company | 1943295 | government contract suppliers |
| MCHUGH MEDIA LIMITED | Registered | NZ Limited Company | 1906481 | government contract suppliers |
| MCILROY CONSULTANCY LIMITED | Registered | NZ Limited Company | 8297489 | government contract suppliers |
| McIlroy Family Trust | Unknown | - | - | councillor interest |
| MCINTOSH COMMERCIAL CONSTRUCTION LIMITED | Registered | NZ Limited Company | 3490356 | government contract suppliers |
| MCINTOSH EXCAVATORS LIMITED | Removed | NZ Limited Company | 826686 | government contract suppliers |
| McIntosh Medical Ltd | Unknown | - | - | government contract suppliers |
| MCINTYRE CONSTRUCTION LIMITED | Registered | NZ Limited Company | 1521104 | government contract suppliers |
| MCINTYRE CONTRACTING LIMITED | Registered | NZ Limited Company | 928187 | councillor interest |
| MCKAY LIMITED | Registered | NZ Limited Company | 44927 | government contract suppliers |
| McKee Fehl Constructors Ltd | Unknown | - | - | government contract suppliers |
| MCKEE-FEHL CONSTRUCTORS LIMITED | Registered | NZ Limited Company | 28109 | government contract suppliers |
| MCKELLAR FARMLANDS (2017) LIMITED | Registered | NZ Limited Company | 6624895 | councillor interest |
| MCKENZIE & PARMA LIMITED | Registered | NZ Limited Company | 2151109 | government contract suppliers |
| MCKENZIE & RIDLEY (KAWERAU) LIMITED | Registered | NZ Limited Company | 414735 | government contract suppliers |
| MCKENZIE CENTRE TRUST | Registered | Charitable Trust | - | government contract suppliers |
| MCKENZIE HIGHAM LIMITED | Registered | NZ Limited Company | 977848 | government contract suppliers |
| MCKENZIE MARINE AND MACKRAFT LIMITED | Registered | NZ Limited Company | 365714 | kanoa recipients |
| MCKENZIE SCOTT ENTERPRISES LIMITED | Registered | NZ Limited Company | 1976527 | |
| MCKENZIE SCOTT GYMNASIUMS LIMITED | Removed | NZ Limited Company | 856287 | |
| McKiwi Sea VenturesLtd | Unknown | - | - | government contract suppliers |
| MCKOLSKEY TRUSTEE LIMITED | Registered | NZ Limited Company | 8776607 | councillor interest |
| MCL (2025) LIMITED | Registered | NZ Limited Company | 9359441 | councillor interest |
| MCL CAPITAL LIMITED | Registered | NZ Limited Company | 4255118 | councillor interest |
| MCL Capital Limited, HT Services Limited, NZ Opera Limited Creative | Unknown | - | - | councillor interest |
| MCL CONSTRUCTION LIMITED | Registered | NZ Limited Company | 163896 | government contract suppliers |
| McLachlan Frater Trust | Unknown | - | - | councillor interest |
| MCLAREN MEDICAL DISTRIBUTORS LIMITED | Registered | NZ Limited Company | 900542 | government contract suppliers |
| MCLARENS GROUP (NZ) LIMITED | Registered | NZ Limited Company | 562615 | government contract suppliers |
| McLean Institute | Unknown | - | - | councillor interest |
| McLean Institute Trust | Unknown | - | - | councillor interest |
| McLellans Limited | Registered | NZ Limited Company | - | government contract suppliers |
| MCLEOD S BOOK CENTRE 1965 LIMITED | Registered | NZ Limited Company | 17204 | councillor interest |
| MCLSTEAD LIMITED | Registered | NZ Limited Company | 9278879 | government contract suppliers |
