| MARCH CATO LIMITED | Registered | NZ Limited Company | 138001 | government contract suppliers |
| MARCH CONSTRUCTION LIMITED | Registered | NZ Limited Company | 132874 | government contract suppliers |
| Marciano Industries Pty Limited | Unknown | - | - | government contract suppliers |
| MARCO BOATS LIMITED | Registered | NZ Limited Company | 1420159 | councillor interest |
| Marcus Langman Planning Consultant | Unknown | - | - | government contract suppliers |
| MARDEE ENTERPRISES LIMITED | Removed | NZ Limited Company | 1987935 | councillor interest |
| Margaret Watt Children's Trust | Registered | Charitable Trust | - | councillor interest |
| MARGIE APA ADVISORY LIMITED | Registered | NZ Limited Company | 9401892 | |
| MARGULES GROOME CONSULTING LIMITED | Registered | NZ Limited Company | 5554706 | government contract suppliers |
| MARHABA EVENTS & HOSPITALITY LIMITED | Registered | NZ Limited Company | 7874616 | government contract suppliers |
| Maria Dew QC, Barrister | Unknown | - | - | government contract suppliers |
| Marine Farming Association Incorporated | Registered | Incorporated Society | - | kanoa recipients |
| MARINE SOUTH LIMITED | Registered | NZ Limited Company | 2055313 | councillor interest |
| MARINER TRUSTEE COMPANY LIMITED | Registered | NZ Limited Company | 2018617 | councillor interest |
| Maritime New Zealand | Registered | - | - | |
| Maritime Union of New Zealand Inc | Registered | Incorporated Society | - | political donors |
| Mark & Penny Family Trust | Unknown | - | - | councillor interest |
| MARK ADAMS CONTRACTING LIMITED | Removed | NZ Limited Company | 3886880 | |
| MARK ADAMS LIMITED | Registered | NZ Limited Company | 1698679 | |
| Mark and Linda Sincock t/a Roxburgh Passenger Services 2003 | Unknown | - | - | government contract suppliers |
| Mark Aydon | Unknown | - | - | government contract suppliers |
| MARK BROUGH EARTHMOVING LIMITED | Removed | NZ Limited Company | 1215544 | |
| MARK BROWN CONTRACTORS LIMITED | Registered | NZ Limited Company | 492568 | |
| MARK BROWN HOLDINGS LIMITED | Registered | NZ Limited Company | 6446512 | |
| MARK BROWN LIMITED | Removed | NZ Limited Company | 1837596 | |
| MARK BROWN MOTORS LIMITED | Registered | NZ Limited Company | 1029905 | |
| MARK BROWNE TRUSTEES LIMITED | Registered | NZ Limited Company | 1117212 | |
| MARK BROWNIE AUTOMOBILES LIMITED | Removed | NZ Limited Company | 264758 | |
| MARK BURTON'S PAINTING & DECORATING SERVICES LIMITED | Removed | NZ Limited Company | 1852665 | |
| Mark Drabble T/A Drabble Pest Control | Unknown | - | - | government contract suppliers |
| MARK DRURY MOTORS 2013 LIMITED | Registered | NZ Limited Company | 4332379 | |
| MARK DUNAJTSCHIK CHARITY LIMITED | Registered | NZ Limited Company | 6489995 | corporate donations |
| MARK GOODHEW LIMITED | Registered | - | - | |
| MARK GREEN FAST FIX LIMITED | Removed | NZ Limited Company | 1432919 | |
| MARK GREEN IMAGE MANAGEMENT LIMITED | Registered | NZ Limited Company | 827943 | |
| MARK GREEN PANELBEATERS LIMITED | Removed | NZ Limited Company | 2439289 | |
| MARK HARRIS BUILDERS LIMITED | Removed | NZ Limited Company | 4638259 | |
| MARK HARRIS FINANCIAL PLANNING SERVICES LIMITED | Removed | NZ Limited Company | 1360762 | |
| MARK HARRISON TRAVEL LIMITED | Removed | NZ Limited Company | 544341 | |
| MARK HARRY HOMES LIMITED | Registered | NZ Limited Company | 1916599 | |
| MARK J MALONEY CONSULTING LIMITED | Removed | NZ Limited Company | 8175966 | government contract suppliers |
| MARK JEWKES LIMITED | Registered | NZ Limited Company | 1468861 | government contract suppliers |
| Mark McIntyre Family Trust | Unknown | - | - | councillor interest |
| Mark McKelvie Trust | Unknown | - | - | mp interest |
| MARK MITCHELL CONSTRUCTION (OTAGO) LIMITED | Removed | NZ Limited Company | 632193 | |
| MARK MITCHELL ELECTRICAL SERVICES LIMITED | Registered | NZ Limited Company | 930609 | |
| MARK PATERSON HAWES & ASSOCIATES LIMITED | Registered | NZ Limited Company | 899794 | |
| MARK PATTERSON FAMILY TRUST LIMITED | Registered | NZ Limited Company | 8248921 | |
| MARK PATTERSON SUSPENSION LIMITED | Registered | NZ Limited Company | 9329962 | |
| MARK PETERS CONSTRUCTION LIMITED | Removed | NZ Limited Company | 117599 | |