| Brilliant Red Limited | Professional & scientific | 2013 |
| Brinlack L Ltd | Administrative & support | 2022 |
| Brite Services Cleaning Co Ltd | Administrative & support | 2020 |
| Brixblox Ltd | Construction | 2024 |
| Broad PK Ltd | Construction | 2012 |
| Broadcast Technical Services UK Limited | Information & communication | 2016 |
| Broadchoice Capital Limited | Real estate | 2018 |
| Broadwell L.P. | | 2015 |
| Brocav Ltd | Manufacturing | 2024 |
| Brogies Ltd | Financial services | 2024 |
| Brolly Engineering Service Ltd | Professional & scientific | 2024 |
| Bromfield Management Limited | Households | 2006 |
| Bronagh Taylor Ltd | Education | 2022 |
| Brook Cafe Ltd | Hospitality | 2025 |
| Brooklawn Services Ltd | Construction | 2019 |
| Brookley Homes Limited | Construction | 2011 |
| Brookmount Group Ltd | Financial services | 2005 |
| Brookshire Holdings Ltd | Construction | 2017 |
| Brookvale EHS Solutions Ltd | Professional & scientific | 2024 |
| Broomhill Town House Management Company Limited | Households | 2006 |
| Brosaac Building Ltd | Construction | 2026 |
| Brown Cars Limited | Wholesale & retail | 2014 |
| Brown International Trading Ltd | Wholesale & retail | 2023 |
| Browns Service Centre Ltd | Wholesale & retail | 2020 |
| Brussig Thomas Limited | Wholesale & retail | 2024 |
| Bryan MC Namee Meats Ltd | Wholesale & retail | 2018 |
| BS Bloodstock Limited | Agriculture & fishing | 2015 |
| BSB Ventures LLP | | 2011 |
| BSC Food Ltd | Hospitality | 2022 |
| Bscc Engineering Ltd | Construction | 2025 |
| Bsld (BB) Ltd | Arts & recreation | 2013 |
| Bsld Ballymena Ltd | Arts & recreation | 2012 |
| Bsld Omagh Ltd | Arts & recreation | 2020 |
| Bsld Property Ltd | Real estate | 2015 |
| Bsld SLD Ltd | Arts & recreation | 2018 |
| BT66 Homes Ltd | Construction | 2024 |
| BTS Drainage & Utilities Ltd | Water & waste | 2026 |
| Bubbles Wholesale Limited | Wholesale & retail | 2010 |
| Built Environment Consulting Partnership Ltd | Professional & scientific | 2025 |
| Built Right Ltd | Professional & scientific | 2015 |
| Bunadh UK Ltd | Manufacturing | 2026 |
| Bunreal Ltd | Hospitality | 2018 |
| Bureau Buttercrane Ltd | Financial services | 2010 |
| Burren Chippy Ltd | Hospitality | 2024 |
| BUS Bar Banbridge Limited | Hospitality | 2018 |
| Buttercrane Traders Association Limited | Other services | 1989 |
| Buttercrane Vivo Limited | Wholesale & retail | 2017 |
| Buzzard Comics Ltd | Wholesale & retail | 2018 |
| BVT (N.I.) Ltd | Wholesale & retail | 2022 |
| BWE Equestrian Limited | Agriculture & fishing | 2024 |
| BWE Wellington Limited | Real estate | 2016 |
| BWL Food Retail Limited | Hospitality | 2010 |
| Bynehill Bloodstock Ltd | Agriculture & fishing | 2021 |
| Byrne Blasting & Painting Services Ltd | Construction | 2026 |
| Byrne Insurance Services Limited | Financial services | 1977 |
| Byrne Joinery Contracts Limited | Construction | 2017 |
| Byrne Mckevitt Limited | Construction | 2021 |
| Byrne Patterson & Co. Ltd | Professional & scientific | 2009 |
| C & a Sales Agencies Ltd | Wholesale & retail | 2011 |
| C & C Mcmahon Ltd | Real estate | 2024 |
| C & H Burns Limited | Wholesale & retail | 1997 |
| C & L Mushrooms Limited | Administrative & support | 2007 |
| C & PD Construction Ltd | Construction | 2024 |
| C & S Mcavoy Ltd | Hospitality | 2013 |
| C & S Transport Limited | Wholesale & retail | 2021 |
| C Clarke Graphics Ltd | Wholesale & retail | 2014 |
| C Devlin Transport Ltd | Transport & logistics | 2026 |
| C Ferris Painting and Decorating Ltd | Construction | 2026 |
| C Gilmore Autos Ltd | Wholesale & retail | 2017 |
| C Havern Ltd | Construction | 2022 |
| C J Magill Limited | Other services | 2014 |
| C L Windows Ltd | Construction | 2026 |
| C M MC Contracts Ltd | Construction | 2016 |
| C MC C Transport NI Ltd | Transport & logistics | 2014 |
| C MC Keown Joinery Ltd | Construction | 2015 |
| C O' Hare Joinery Ltd | Construction | 2017 |
| C O'Hare Consultancy Limited | Information & communication | 2024 |
| C R Rentals Ltd | Real estate | 2015 |
| C R Smith Property Ltd | Real estate | 2024 |
| C Sweeney Sculpting Ltd | Arts & recreation | 2022 |
| C Trainor Building Ltd | Construction | 2021 |
| C&A Byrne Limited | Construction | 2005 |
| C&B Glazing Ltd | Wholesale & retail | 2023 |
| C&C Farms Ltd | Agriculture & fishing | 2015 |
| C&J Design & Engineering (NI) Limited | Professional & scientific | 2014 |
| C&N Chambers Seafood Ltd | Agriculture & fishing | 2021 |
| C. Short Ltd | Administrative & support | 2007 |
| C.A.R.S. Limited | Wholesale & retail | 1956 |
| C.B.C. (Distributors) | Wholesale & retail | 1950 |
| C.O.N. Holdings Limited | Professional & scientific | 2017 |
| C.R. Autoworx Limited | Wholesale & retail | 2019 |
| C.S. Ennis Accountants Ltd | Professional & scientific | 2023 |
| C.S.D. Developments Co. Ltd | Real estate | 2020 |
| Cabinotier Co Limited | Wholesale & retail | 2024 |
| Cabra Property Company Limited | Real estate | 1999 |
| Cacola Developments Limited | Construction | 2008 |
| Caden Contracts Ltd | Construction | 2025 |
| Cafe by Oakwood Ltd | Hospitality | 2026 |
| Cafe COG Ltd | Wholesale & retail | 2010 |
| Cafe JAM Ltd | Hospitality | 2026 |