| BPM Solutions Ltd | Information & communication | 2025 |
| Bpni Ltd | Real estate | 2021 |
| BPS Property Holdings Ltd | Real estate | 2025 |
| BPT Electrical Ltd | Extraterritorial | 2014 |
| BR Energy Consulting Ltd | Professional & scientific | 2021 |
| BR Pizza Ltd | Hospitality | 2023 |
| BR Traffic Management Services Limited | Transport & logistics | 2018 |
| BR71 Ltd | Professional & scientific | 2014 |
| Brackagh Enterprises Limited | Professional & scientific | 1986 |
| Bracken Hill NO.1 Management Company Limited | Households | 2011 |
| Bracken Hill NO.2 Management Company Limited | Households | 2015 |
| Bracken Hill Property Ltd | Real estate | 2021 |
| Bracken Lodge Development Limited | Households | 1987 |
| Bracken Smart Blinds Ltd | Construction | 2020 |
| Brackengarth Limited | Hospitality | 2022 |
| Brackenvale Limited | Real estate | 2020 |
| Brackly Limited | Professional & scientific | 2014 |
| Bradbury Developments (Ireland) Limited | Extraterritorial | 2001 |
| Bradbury Propco Ltd | Hospitality | 2026 |
| Bradbury Stores Limited | Wholesale & retail | 2013 |
| Bradbury Student Living Limited | Real estate | 2021 |
| Bradbury Student Properties Limited | Real estate | 2021 |
| Bradburyart Limited | Wholesale & retail | 2016 |
| Braden Dental Care Limited | Health & social care | 2011 |
| Braden Glen Management Limited | Households | 2001 |
| Bradley & Lawrence Facilities Management Ltd | Administrative & support | 2024 |
| Bradley Group (U.K.) Limited | Manufacturing | 2016 |
| Bradley Holdings Ltd | Real estate | 2026 |
| Bradley Innovation Group Ltd | Wholesale & retail | 2025 |
| Bradley Medical Limited | Health & social care | 2025 |
| Bradley Quinn Photography Ltd | Professional & scientific | 2018 |
| Brady Group Holdings Limited | Financial services | 2024 |
| Brady Group Limited | Professional & scientific | 2017 |
| Brae Consultancy Ltd | Professional & scientific | 2019 |
| Brae Hire Ltd | Administrative & support | 2018 |
| Brae Manor Management Company Ltd | Extraterritorial | 2001 |
| Braefoot Ltd | Construction | 2015 |
| Braehead Ballyholey Ltd | Manufacturing | 2023 |
| Braemar Enterprises Limited | Professional & scientific | 2011 |
| Braeview Apartments Ltd | Extraterritorial | 2000 |
| Bragbet Limited | Arts & recreation | 2013 |
| Braham Mechanical Limited | Construction | 2008 |
| Braid Engineering Limited | Manufacturing | 2009 |
| Brain and Nerd Ltd | Information & communication | 2013 |
| Brain Body Balance Ltd | Education | 2026 |
| Brain Body Daily Ltd | Wholesale & retail | 2025 |
| Brain Injury Matters (NI) | Health & social care | 1999 |
| Brainwavebank Ltd. | Information & communication | 2020 |
| Brakeman Limited | Wholesale & retail | 2025 |
| Braker Limited Partnership | | 2016 |
| Braketech Ireland Ltd | Wholesale & retail | 2003 |
| Branagan Construction Ltd | Construction | 2017 |
| Branagh Legal Ltd | Professional & scientific | 2025 |
| Branch Campus (London & Birmingham) Limited | Education | 2012 |
| Branch Trading Ltd | Wholesale & retail | 2026 |
| Branchasn Ltd | Wholesale & retail | 2025 |
| Brand Action Ireland Ltd | Wholesale & retail | 2018 |
| Brand Enable Limited | Information & communication | 2018 |
| Brandenburg Properties Limited | Extraterritorial | 1999 |
| Brandon Tech Limited | Wholesale & retail | 2024 |
| Brands Booster LP | | 2022 |
| Brandscape Media Ltd | Professional & scientific | 2025 |
| Brani Enterprises Ltd | Real estate | 2025 |
| Braniel Investments Limited | Real estate | 2016 |
| Brannock Management Company Limited | Extraterritorial | 2000 |
| Brannon Properties Limited | Construction | 2003 |
| Brantiner Limited | Health & social care | 2026 |
| Brantside Ltd | Arts & recreation | 2016 |
| Branwood Ltd | Manufacturing | 2021 |
| Brassneck Theatre Company | Arts & recreation | 2009 |
| Bravado Designs Ltd | Wholesale & retail | 2024 |
| Bravism Digital Ltd. | Information & communication | 2025 |
| Bravo Idea International Limited | Wholesale & retail | 2026 |
| Bravo Outdoor Ltd | Professional & scientific | 1997 |
| Bray Street Stores Ltd | Wholesale & retail | 2025 |
| Brayfield Developments Limited | Construction | 2016 |
| Brazilia Cafe Limited | Hospitality | 2017 |
| Brcn Ltd | Manufacturing | 2024 |
| Brcpartnership Ltd | Professional & scientific | 2014 |
| BRD Wind Limited | Energy | 2013 |
| Breac Property Ltd | Real estate | 2025 |
| Bread & Banjo Bakery Ltd | Manufacturing | 2025 |
| Bread Street Bakery Ltd | Hospitality | 2023 |
| Breadboys Limited | Hospitality | 2026 |
| Breadly UK Ltd | Information & communication | 2025 |
| Breagho Limited | Energy | 2013 |
| Break Apparel Ltd | Wholesale & retail | 2014 |
| Breastival Belfast CIC | Education | 2017 |
| Brechan Limited | Construction | 2023 |
| Brecon Group Ltd | Hospitality | 2026 |
| Breda Best Limited | Wholesale & retail | 2025 |
| Bredaimport Ltd | Wholesale & retail | 2023 |
| Breeds Wealth Ltd | Construction | 2022 |
| Breeins Ltd | Wholesale & retail | 2024 |
| Breen Bangor Ltd | Hospitality | 2013 |
| Breen Lenzi Maguire Limited | Professional & scientific | 2011 |
| Breen Planning Ltd | Professional & scientific | 2023 |
| Breeze Drycleaner (NI) Ltd | Other services | 2012 |
| Breeze Express Couriers Limited | Administrative & support | 2024 |
| Breezemount Storage Limited | Transport & logistics | 1970 |