| Biotronik Pty Ltd | Unknown | - | - | government contract suppliers |
| Birchfield Coal Mine Ltd | Unknown | - | - | government contract suppliers |
| BIRCHFIELD COAL MINES LIMITED | Registered | - | - | |
| BIRCHFIELD HOLDINGS LIMITED | Registered | - | - | |
| BIRCHFIELD MINERALS LIMITED | Registered | NZ Limited Company | 535980 | councillor interest |
| BIRCHGROVE HOLDINGS LIMITED | Registered | NZ Limited Company | 3385949 | councillor interest |
| BIRTHRIGHT (HB) CHILD AND FAMILY CARE TRUST | Registered | Charitable Trust | - | government contract suppliers |
| Birthright Hawkes Bay Child and Family Care Trust | Unknown | - | - | government contract suppliers |
| BISHMAN LIMITED | Registered | NZ Limited Company | 567129 | government contract suppliers |
| BISHOP INTERIORS LIMITED | Registered | NZ Limited Company | 696499 | government contract suppliers |
| Bishops Action Foundation | Unknown | - | - | councillor interest |
| BISON GROUP LIMITED | Registered | NZ Limited Company | 5115901 | kanoa recipients |
| BizLink Hāwera | Registered | Incorporated Society | - | councillor interest |
| BJ & KJ Purdy Partnership | Unknown | - | - | councillor interest |
| BJ BALL LIMITED | Registered | NZ Limited Company | 2143159 | government contract suppliers |
| BKM Consulting | Unknown | - | - | government contract suppliers |
| BLACK & WHITE ACCOUNTING LIMITED | Registered | - | - | |
| BLACK & WHITE MORTGAGES & INSURANCE LIMITED | Registered | - | - | |
| BLACK & WHITE REAL ESTATE (HB) LIMITED | Registered | - | - | |
| BLACK & WHITE TRUSTEES COMPANY LIMITED | Registered | - | - | |
| BLACK AND WEE LIMITED | Registered | NZ Limited Company | 8928048 | government contract suppliers |
| Black Clash cricket event | Unknown | - | - | corporate donations |
| BLACK DIAMOND TECHNOLOGIES LIMITED | Registered | NZ Limited Company | 38448 | government contract suppliers |
| BLACK FIG CATERING, EVENT AND PROJECT MANAGEMENT LIMITED | Registered | NZ Limited Company | 2117962 | government contract suppliers |
| Black Folks Camp Too | Unknown | - | - | corporate donations |
| Black Folks Camp Too (BFCT) | Unknown | - | - | corporate donations |
| Black Interiors & Construction Ltd | Unknown | - | - | government contract suppliers |
| BLACK INTERIORS + CONSTRUCTION LIMITED | Registered | NZ Limited Company | 4797179 | government contract suppliers |
| BLACK PINE CONSTRUCTION LIMITED | Registered | NZ Limited Company | 6243830 | government contract suppliers |
| BLACK PINE LIMITED | Registered | NZ Limited Company | 3917660 | government contract suppliers |
| BLACK ROCKS CONSTRUCTION LIMITED | Registered | NZ Limited Company | 6080030 | government contract suppliers |
| BLACKBEE LIMITED | Registered | NZ Limited Company | 8107677 | councillor interest |
| BLACKLAND PUBLIC RELATIONS LIMITED | Registered | NZ Limited Company | 3429892 | government contract suppliers |
| BlackRock Greater EU Investment Trust | Unknown | - | - | mp interest |
| BLACKROCK LIMITED | Removed | NZ Limited Company | 6444995 | fund managers |
| BLACKWELL AG LIMITED | Registered | NZ Limited Company | 6286430 | councillor interest |
| Blair Griffiths Family Trust | Unknown | - | - | councillor interest |
| BLAKELY CONSTRUCTION LIMITED | Removed | NZ Limited Company | 3764289 | government contract suppliers |
| Blaketown Rugby Club Pike River Memorial Scholarship Trust | Unknown | - | - | mp interest |
| Blaketown Rugby Club Pike River Memorial Trust | Unknown | - | - | mp interest |
| BLEND LEARNING NZ LIMITED | Registered | NZ Limited Company | 6909374 | government contract suppliers |
| Blenheim Bowls and Sports Club Golf Section | Unknown | - | - | councillor interest |
| Blenheim District Pipe Band | Unknown | - | - | councillor interest |
| Blenheim Golf Club | Registered | Incorporated Society | - | councillor interest |
| Blind Low Vision NZ | Registered | Education | - | government contract suppliers |
| BLIS TECHNOLOGIES LIMITED | Registered | - | - | |
| BLITVIC TRUSTEES LIMITED | Registered | NZ Limited Company | 8925728 | councillor interest |
| BLOKE & CO PRODUCTS LIMITED | Removed | NZ Limited Company | 6551072 | councillor interest |
| BLOMQUIST INVESTMENT LIMITED | Registered | NZ Limited Company | 959097 | government contract suppliers |
| BLOSSOMS EDUCARE LIMITED | Registered | NZ Limited Company | 2496438 | government contract suppliers |
