| Bruce R and Jillian M Campbell | Registered | - | - | |
| Bruce Taylor Trust | Unknown | - | - | councillor interest |
| Bruerton Family Trust | Unknown | - | - | councillor interest |
| BRUERTON HOLDINGS LIMITED | Registered | NZ Limited Company | 1135335 | councillor interest |
| BRUKER PTY LTD | Registered | Overseas ASIC Company | 4042738 | government contract suppliers |
| BRUNCH'N'LUNCH NZ LIMITED | Registered | NZ Limited Company | 2387840 | government contract suppliers |
| BRUNEL CONSTRUCTION LIMITED | Removed | NZ Limited Company | 1955433 | government contract suppliers |
| BRUNEL GROUP LIMITED | Registered | NZ Limited Company | 5474845 | government contract suppliers |
| BRYANT FAMILY TRUSTEE COMPANY LIMITED | Registered | NZ Limited Company | 7914777 | councillor interest |
| Bryce O'Sullivan Contracting Ltd | Unknown | - | - | government contract suppliers |
| BSI PEOPLE SKILLS LIMITED | Registered | NZ Limited Company | 4645521 | government contract suppliers |
| BSM GROUP ARCHITECTS LIMITED | Registered | NZ Limited Company | 1228038 | government contract suppliers |
| BSN MEDICAL LIMITED | Registered | NZ Limited Company | 1109549 | government contract suppliers |
| BT Mining | Unknown | - | - | government contract suppliers |
| BTW COMPANY LIMITED | Registered | NZ Limited Company | 857862 | government contract suppliers |
| BU EVENTS LIMITED | Registered | NZ Limited Company | 9135592 | councillor interest |
| BUCKS HEATING LIMITED | Registered | NZ Limited Company | 1033892 | government contract suppliers |
| BUDDIES TRADING LIMITED | Registered | NZ Limited Company | 1881010 | government contract suppliers |
| BUDDLE FINDLAY LIMITED | Registered | NZ Limited Company | 1351405 | government contract suppliers |
| BUDGET ADVISORY SERVICE (WHAKATANE) INCORPORATED | Registered | Incorporated Society | - | government contract suppliers |
| BUDGET SET OUTS LIMITED | Registered | NZ Limited Company | 1884693 | councillor interest |
| BUEN HOLDINGS LIMITED | Registered | NZ Limited Company | 1638183 | political donors |
| BUFTON CONSTRUCTION LIMITED | Registered | NZ Limited Company | 7346597 | government contract suppliers |
| BUG OFF GROUP LIMITED | Registered | - | - | |
| BUG OFF NOW LIMITED | Registered | - | - | |
| BUILD IT NORTHLAND LIMITED | Registered | NZ Limited Company | 6815294 | government contract suppliers |
| Buildcorp Management Ltd via Joel McLellan | Unknown | - | - | political donors |
| Buildcorp Management Ltd, BDO Spicers, Level 10, 19 Como Street, Takapuna, Auckland 0740 | Unknown | - | - | political donors |
| BUILDING & FIRE SERVICES (2008) LIMITED | Registered | NZ Limited Company | 2128824 | government contract suppliers |
| Building & Property Management Services Ltd | Unknown | - | - | government contract suppliers |
| Building Compliance Group Limited | Unknown | - | - | government contract suppliers |
| BUILDING CONNEXION LIMITED | Registered | NZ Limited Company | 1198301 | iwi subsidiaries |
| BUILDING SERVICES ENGINEERING 2019 LIMITED | Registered | NZ Limited Company | 2093566 | government contract suppliers |
| Building Solutions Reinstatement Group Ltd | Unknown | - | - | government contract suppliers |
| BUILDMASTER LIMITED | Registered | NZ Limited Company | 1943546 | government contract suppliers |
| BUILDSURE ASSOCIATES LIMITED | Registered | NZ Limited Company | 5808404 | government contract suppliers |
| BUILT (NZ) PTY. LIMITED | Registered | Overseas ASIC Company | 5807765 | government contract suppliers |
| BUILT CONSTRUCTION GROUP LIMITED | Registered | NZ Limited Company | 5479222 | government contract suppliers |
| BUILT LOCAL LIMITED | Registered | NZ Limited Company | 5912911 | government contract suppliers |
| BUILTSMART LIMITED | Registered | NZ Limited Company | 2225050 | government contract suppliers |
| BULLER ELECTRICITY LIMITED | Registered | NZ Limited Company | 565395 | councillor interest |
| Buller REAP | Unknown | - | - | government contract suppliers |
| Bulls & Districts Historical Society (Inc) | Unknown | - | - | councillor interest |
| BULLS, BIRDIES, BOGEYS AND BEARS LIMITED | Registered | NZ Limited Company | 1882862 | councillor interest |
| BUNGY NEW ZEALAND LIMITED | Registered | NZ Limited Company | 423093 | kanoa recipients |
| BUNNINGS (NZ) LIMITED | Removed | NZ Limited Company | 1146236 | government contract suppliers |
| Bunsiness in Wind Projects BV | Unknown | - | - | government contract suppliers |
| BUNZL OUTSOURCING SERVICES NZ LIMITED | Registered | NZ Limited Company | 1290292 | government contract suppliers |
| BUPA CARE SERVICES NZ LIMITED | Registered | - | - | |
| Burn Support Group Charitable Trust | Removed | Charitable Trust | - | corporate donations |