| Athenree Homestead Trust | Registered | Charitable Trust | - | councillor interest |
| Athfield Architects Limited | Unknown | - | - | government contract suppliers |
| Athfields Architects Limited | Unknown | - | - | government contract suppliers |
| Athletes Cooperative Incorporated | Registered | Incorporated Society | - | councillor interest |
| ATHLETICS CANTERBURY INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| ATHLETICS HAWKES BAY GISBORNE INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| Athletics Nelson Inc | Registered | Incorporated Society | - | councillor interest |
| ATHLETICS NORTHLAND INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| Ātiawa ki Whakarongotai Asset Holding Company Limited | Unknown | - | - | iwi subsidiaries |
| ATIAWA KI WHAKARONGOTAI CHARITABLE TRUST BOARD | Registered | Charitable Trust | - | government contract suppliers |
| ATIAWA KI WHAKARONGOTAI HOLDINGS LIMITED | Registered | NZ Limited Company | 1728125 | iwi subsidiaries |
| ATIAWA NUI TONU FISHERIES LIMITED | Registered | NZ Limited Company | 1793437 | charities nzbn sync |
| ATIAWA TOA FM LIMITED | Registered | NZ Limited Company | 484512 | charities nzbn sync |
| ĀTIAWA TOA HAUORA PARTNERSHIP BOARD | Registered | - | - | |
| ATKIN CONSTRUCTION (HB) LIMITED | Registered | NZ Limited Company | 5033540 | government contract suppliers |
| Atkins Law | Unknown | - | - | government contract suppliers |
| ATKINSON & DOSSETT LIMITED | Registered | NZ Limited Company | 126645 | government contract suppliers |
| ATKINSREALIS NEW ZEALAND LIMITED | Registered | NZ Limited Company | 1725107 | government contract suppliers |
| ATL ELECTRICAL LIMITED | Registered | NZ Limited Company | 2103730 | government contract suppliers |
| ATL GROUP LIMITED | Removed | NZ Limited Company | 2115322 | government contract suppliers |
| Atlantic Pacific American Express | Unknown | - | - | government contract suppliers |
| ATLANTIS HEALTH NEW ZEALAND LIMITED | Registered | NZ Limited Company | 834483 | government contract suppliers |
| Atlas Concrete Ltd via Graham Collie | Unknown | - | - | political donors |
| ATLAS FOUNDATION | Registered | Charitable Trust | - | charities nzbn sync |
| ATMOSPHERE LIMITED | Removed | NZ Limited Company | 1014867 | government contract suppliers |
| ATOM TREE SPECIALISTS LIMITED | Registered | NZ Limited Company | 5898348 | government contract suppliers |
| ATOMIC CHURCH | Registered | Charitable Trust | - | charities nzbn sync |
| Atomise Limited | Unknown | - | - | government contract suppliers |
| ATOMOS LIMITED | Registered | - | - | |
| ATS Environmental | Registered | NZ Limited Company | - | government contract suppliers |
| ATTAINABLE TRUST | Registered | Charitable Trust | - | charities nzbn sync |
| ATTEKUS NZ LIMITED | Registered | NZ Limited Company | 9200360 | government contract suppliers |
| ATTIC ARTS CENTRE CHARITABLE TRUST | Registered | Charitable Trust | - | charities nzbn sync |
| Attitude Awards Trust | Registered | Charitable Trust | - | mp interest |
| ATTURRA NZ LIMITED | Registered | NZ Limited Company | 952616 | government contract suppliers |
| ATUA AWHI COMMUNITY CHARITABLE TRUST | Registered | Charitable Trust | - | charities nzbn sync |
| ATUITUI CHARITABLE TRUST | Registered | Charitable Trust | - | charities nzbn sync |
| AU CONSULTING LIMITED | Registered | NZ Limited Company | 8102617 | government contract suppliers |
| AU USO KERISIANO LAVEAI HENDERSON TRUST | Registered | Charitable Trust | - | charities nzbn sync |
| AUBYN LIVE THEATRE INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND & NORTH HARBOUR GOLF REFEREES ASSOCIATION INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND ACADEMY OF FINE ARTS | Registered | Charitable Trust | - | charities nzbn sync |
| Auckland Airport Community Trust | Registered | Charitable Trust | - | corporate donations |
| AUCKLAND AIRPORT LIMITED | Registered | NZ Limited Company | 1956690 | councillor interest |
| AUCKLAND AND DISTRICT PIPE BAND INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND ARTILLERY BAND ASSOCIATION INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND ARYA SAMAJ INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND ASTRONOMICAL SOCIETY INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND BADMINTON ASSOCIATION INCORPORATED | Registered | Incorporated Society | - | charities nzbn sync |
| AUCKLAND BAPTIST TABERNACLE MISSIONS TRUST | Registered | Charitable Trust | - | charities nzbn sync |