| MAX TARR COMMERCIAL LIMITED | Registered | NZ Limited Company | 1333333 | government contract suppliers |
| MAX TARR INDUSTRIAL LIMITED | Registered | NZ Limited Company | 1333334 | government contract suppliers |
| MAX TARR INFRASTRUCTURE ENGINEERS LIMITED | Registered | NZ Limited Company | 8166319 | government contract suppliers |
| MAX TARR INFRASTUCTURE ENGINEERS LIMITED. | Unknown | - | - | government contract suppliers |
| Maxbuild Ltd. | Unknown | - | - | government contract suppliers |
| Maximum LAB Trust | Unknown | - | - | councillor interest |
| MAXION BUILDING SERVICES LIMITED | Registered | NZ Limited Company | 6843075 | government contract suppliers |
| Maxon Group | Unknown | - | - | government contract suppliers |
| MaxTarr | Unknown | - | - | government contract suppliers |
| MAXWELL PLACE LIMITED | Removed | NZ Limited Company | 2252006 | councillor interest |
| MAXWOOD MANUFACTURING LIMITED | Registered | NZ Limited Company | 1053819 | government contract suppliers |
| MAYCROFT CONSTRUCTION LIMITED | Registered | NZ Limited Company | 848809 | government contract suppliers |
| MAYCROFT GROUP LIMITED | Registered | NZ Limited Company | 6933413 | government contract suppliers |
| Maycroft_Central | Unknown | - | - | government contract suppliers |
| MAYER & TOYE LIMITED | Registered | NZ Limited Company | 6383513 | government contract suppliers |
| MAYGROVE MANAGEMENT SERVICES LIMITED | Registered | NZ Limited Company | 498728 | government contract suppliers |
| MAYNARD MARKS NEW ZEALAND LIMITED | Registered | NZ Limited Company | 7985619 | government contract suppliers |
| Mayne Wetherell | Unknown | - | - | government contract suppliers |
| Mayor's Task Force for Jobs – Core Group | Unknown | - | - | councillor interest |
| Mayoral Fund for the Pacific | Unknown | - | - | mp interest |
| Mayport Equities Ltd | Unknown | - | - | councillor interest |
| MB Brown | Unknown | - | - | government contract suppliers |
| Mb3 Ltd. | Unknown | - | - | government contract suppliers |
| MBA Family Trust | Unknown | - | - | councillor interest |
| MBARK LIMITED | Registered | - | - | |
| MBC CONSULTING LIMITED | Registered | NZ Limited Company | 2393037 | government contract suppliers |
| MBC ENVIRONMENTAL LIMITED | Registered | NZ Limited Company | 6073348 | government contract suppliers |
| MBD CONTRACTING LIMITED | Registered | NZ Limited Company | 1918653 | government contract suppliers |
| MBD Contracting Ltdmetsed | Unknown | - | - | government contract suppliers |
| MCALPINE HUSSMANN LIMITED | Registered | NZ Limited Company | 532814 | government contract suppliers |
| MCARTHUR & SYMONS ELECTRICAL LIMITED | Registered | NZ Limited Company | 2234467 | government contract suppliers |
| McArthur & Symons Electriocal Limited | Unknown | - | - | government contract suppliers |
| MCAULAY CONSTRUCTION LIMITED | Registered | NZ Limited Company | 6241904 | government contract suppliers |
| MCBRIDE CONSTRUCTION LIMITED | Registered | NZ Limited Company | 2237487 | government contract suppliers |
| McBride Davenport James | Unknown | - | - | government contract suppliers |
| MCC NOMINEES 2014 LIMITED | Registered | NZ Limited Company | 4960459 | councillor interest |
| MCC NOMINEES 2015 LIMITED | Registered | NZ Limited Company | 5753297 | councillor interest |
| MCC NOMINEES 2020 LIMITED | Registered | NZ Limited Company | 7860821 | councillor interest |
| MCC NOMINEES 2022 LIMITED | Registered | NZ Limited Company | 8293529 | councillor interest |
| MCC NOMINEES 2024 LIMITED | Registered | NZ Limited Company | 9107039 | councillor interest |
| MCC NOMINEES 2025 LIMITED | Registered | NZ Limited Company | 9390625 | councillor interest |
| MCC NOMINEES 2026 LIMITED | Registered | NZ Limited Company | 9399692 | councillor interest |
| MCC OPOHO LEITH NOMINEES LIMITED | Registered | NZ Limited Company | 6756821 | councillor interest |
| MCC SB LIMITED | Registered | NZ Limited Company | 9380895 | councillor interest |
| MCCAFFREY AND CABLE CONSULTANTS LIMITED | Registered | NZ Limited Company | 6379473 | government contract suppliers |
| MCCALLUM BROS LTD. | Unknown | - | - | political donors |
| McCathie Family Trust | Unknown | - | - | councillor interest |
| McCauley Family Trust | Unknown | - | - | councillor interest |
| MCCONNELL BURNS LIMITED | Registered | NZ Limited Company | 8176989 | councillor interest |
| MCCONNELL DOWELL ASIA LIMITED | Removed | NZ Limited Company | 87350 | government contract suppliers |
