| BRM Construction Ltd | Construction | 2018 |
| BRM Holdings (N.I.) Limited | Administrative & support | 2010 |
| Broad Street Advisory Limited | Professional & scientific | 2017 |
| Broadcast & Media Marketing Ltd | Professional & scientific | 2020 |
| Broadfactory Limited | Information & communication | 2014 |
| Broadsword House Ltd | Hospitality | 2013 |
| Broadway Management (NI) Limited | Households | 2006 |
| Broadway Neill Limited | Financial services | 2022 |
| Broadwide International (UK) Ltd | Financial services | 2024 |
| Brockagh Wind Limited | Energy | 2016 |
| Brockaghboy Windfarm Ltd | Energy | 2007 |
| Brogan Group Northern Ireland Ltd | Construction | 2020 |
| Brogan Limited | Real estate | 2016 |
| Broggey Limited | Wholesale & retail | 2016 |
| Broker Claims (NI) Limited | Extraterritorial | 2015 |
| Brokeriq Solutions Limited | Information & communication | 2020 |
| Brokerstown Management Company Limited | Households | 2009 |
| Brompton & Bond Ltd | Hospitality | 2018 |
| Brondo Ltd | Real estate | 2019 |
| Bronsan Racing Ltd | Agriculture & fishing | 2022 |
| Bronze & Glow Ltd | Other services | 2025 |
| Bronze by Heat Ltd | Other services | 2017 |
| Bronzing Beauty Ltd | Other services | 2022 |
| Brook 2000 Ltd | Manufacturing | 2023 |
| Brook Factory BAN Ltd | Construction | 2025 |
| Brook Street Surgery Property Limited | Extraterritorial | 2015 |
| Brookdale Biogas (UK) Limited | Energy | 2025 |
| Brookdale Partners (UK) Ltd | Administrative & support | 2020 |
| Brooke Cottage Management Company Limited | Households | 2005 |
| Brooke Inns Limited | Hospitality | 2013 |
| Brookeborough Halls Apartments Limited | Households | 2007 |
| Brookfield Car Sales Ltd | Wholesale & retail | 2023 |
| Brookfield Healthcare Products Limited | Administrative & support | 1994 |
| Brookhill Avenue Management Company Limited | Households | 2023 |
| Brookland Court Management Company Limited | Households | 2003 |
| Brookland Property Ltd | Construction | 2017 |
| Brooklawn Limited | Health & social care | 2017 |
| Brooklime Limited | Wholesale & retail | 2025 |
| Brooklyn Pizza & Co. Ltd | Hospitality | 2025 |
| Brookmount Building Supplies Limited | Professional & scientific | 1980 |
| Brookside Bullion Limited | Manufacturing | 2025 |
| Brookville Masonic Hall Co., Limited | Real estate | 1921 |
| Broome Estates Limited | Real estate | 1953 |
| Broomhill Communications Limited | Information & communication | 2025 |
| Broomhill Imaging Limited | Health & social care | 2025 |
| Broomhill Investments Limited | Real estate | 2018 |
| Broomhill Lane Management Limited | Households | 2009 |
| Bropalu Ltd | Wholesale & retail | 2025 |
| Brosoft Technologies Ltd | Wholesale & retail | 2018 |
| Brothers 423 Ltd | Hospitality | 2022 |
| Brothers Flooring Contractors Ltd | Construction | 2025 |
| Brothers Lynch Ltd | Construction | 2025 |
| Brother’S 2023 Ltd | Hospitality | 2023 |
| Brough Hall Property Management Ltd | Extraterritorial | 2003 |
| Brouwersgracht Ltd | Wholesale & retail | 2021 |
| Brown & Co Ventures Ltd | Real estate | 2025 |
| Brown Bread Design Ltd | Professional & scientific | 2017 |
| Brown Hare Catering Ltd | Hospitality | 2018 |
| Brown Lemonade Community Interest Company | Arts & recreation | 2015 |
| Brown O'Connor Communications LLP | | 2017 |
| Brown O'Connor Group Limited | Professional & scientific | 2021 |
| Browndod Limited | Real estate | 2010 |
| Browne Jacobson (VI) Limited | Professional & scientific | 2025 |
| Browne Jacobson Northern Ireland Limited | Professional & scientific | 2015 |
| Brownes Fast Foods Ltd | Hospitality | 2016 |
| Brownies on the Hill Ltd | Manufacturing | 2021 |
| Browning Developments Limited | Wholesale & retail | 1993 |
| Browns Coachworks Limited | Manufacturing | 1976 |
| Browns Fish & Chips Belfast Ltd | Hospitality | 2020 |
| BRS Golf Limited | Information & communication | 2011 |
| BRT 123 Limited | Financial services | 2014 |
| BRT Builders Ltd | Construction | 2025 |
| Bruiser Theatre Company | Arts & recreation | 2009 |
| Brukar Limited | Hospitality | 2026 |
| Brulianj Limited | Wholesale & retail | 2025 |
| Brumor Limited | Real estate | 1932 |
| Brunswick (8 Lanyon Place) Limited | Construction | 2005 |
| Brunswick Dental Ltd. | Extraterritorial | 2023 |
| Bryan JAR Limited | Real estate | 2021 |
| Bryan Property Limited | Real estate | 2017 |
| Bryan Thomas Limited | Wholesale & retail | 2025 |
| Bryansburn Filling Station Ltd | Wholesale & retail | 2015 |
| Bryanscourt Limited | Households | 1967 |
| Bryansford Road Management Company Limited | Households | 2004 |
| Bryson Architects Ltd | Professional & scientific | 2005 |
| Bryson Care | Health & social care | 2011 |
| Bryson Charitable Group | Health & social care | 1939 |
| Bryson Energy | Information & communication | 2010 |
| Bryson Futureskills Ltd. | Administrative & support | 2004 |
| Bryson Recycling Limited | Water & waste | 2012 |
| Bsas Property NI Ltd | Real estate | 2026 |
| BSC Stores Limited | | 1996 |
| Bsdwts Ltd | Wholesale & retail | 2024 |
| BSF (N.I.) Ltd | Construction | 2016 |
| Bshm Limited | Professional & scientific | 2025 |
| Bsides Belfast CIC | Information & communication | 2022 |
| BSM General Trading Limited | Wholesale & retail | 2024 |
| BSM Medical Services Ltd | Health & social care | 2026 |
| Bsmi Football Limited | Arts & recreation | 2019 |
| Bsmi Rugby Limited | Arts & recreation | 2021 |