| BMD Trading Ltd | Transport & logistics | 2024 |
| BMG Tech Ltd | Financial services | 2014 |
| BMK Haulage Ltd | Transport & logistics | 2022 |
| BN Utility Services Limited | Construction | 2021 |
| Bocie Ltd | Financial services | 2023 |
| BOK Autos NI Ltd | Administrative & support | 2019 |
| Born Again Kitchens Limited | Manufacturing | 2012 |
| Boulevard Logistics Ltd | Wholesale & retail | 2023 |
| Bovean Construction Limited | Construction | 2022 |
| Bovean Property Limited | Real estate | 2026 |
| Boyd Electronics Ltd | Construction | 2011 |
| Boyle Aggregate Equipment Engineering Limited | Mining & quarrying | 2011 |
| Boyle Haulage Limited | Transport & logistics | 2018 |
| Bpsa Driver Hire Ltd | Administrative & support | 2026 |
| BR Plant Sales and Hire Ltd | Wholesale & retail | 2026 |
| Bracken Farm Ltd | Agriculture & fishing | 2016 |
| Bradley and Mckay Ltd | Professional & scientific | 2024 |
| Bradon Construction Ltd | Construction | 2018 |
| Brady Consultancy Group Ltd | Professional & scientific | 2015 |
| Brae Block Moulds Limited | Manufacturing | 2010 |
| Braine Consultancy Ltd | Professional & scientific | 2018 |
| Bramley Apple Bakery Ltd | Manufacturing | 2004 |
| Bramley Real Estate Ltd | Real estate | 2023 |
| Brannigan Energy Limited | Energy | 2016 |
| Breathe Pilates & Wellbeing Ltd | Arts & recreation | 2025 |
| Breathing and Movement for Health CIC | Health & social care | 2026 |
| Bredale Holdings Limited | Financial services | 2020 |
| Bremar Tiles Ltd | Wholesale & retail | 2017 |
| Bremcoda Limited | Real estate | 2020 |
| Brenmar Property Ltd | Real estate | 2024 |
| Brewery OFF Sales Limited | Wholesale & retail | 2014 |
| Brian Mclean Ltd | Agriculture & fishing | 2019 |
| Brian Murray Solutions Ltd | Information & communication | 2016 |
| Brian Robinson Accountancy Ltd | Professional & scientific | 2006 |
| Brickyard Developments Ltd | Manufacturing | 2018 |
| Bridgehill Holdings (N.I.) | Financial services | 2019 |
| Bridgehill Property (N.I.) Limited | Real estate | 2019 |
| Brightline Ltd | Professional & scientific | 2026 |
| Brightside Gaming Ltd | Arts & recreation | 2026 |
| Brina Holdings Ltd | Financial services | 2017 |
| BRJ Services Ltd | Professional & scientific | 2026 |
| Brocagh and District Regeneration Group | Real estate | 1996 |
| Brocagh Precision Engineering Ltd | Professional & scientific | 2005 |
| Brodante Properties Limited | | 2005 |
| Brookend Contracts Ltd | Construction | 2018 |
| Broomhill Manor Open Space Management Company Limited | Households | 2022 |
| Brothers Furniture & Interiors Limited | Wholesale & retail | 2024 |
| Bryden Investments Limited | Real estate | 2025 |
| Bryson Blinds Ltd | Wholesale & retail | 2017 |
| Bsafetyni Ltd | Professional & scientific | 2025 |
| BSK Engineering Ltd | Manufacturing | 2014 |
| Buddies Daycare Ltd | Health & social care | 2022 |
| Buddy Bear Trust | Health & social care | 1989 |
| Build by Western Ltd | Construction | 2020 |
| Buildtech Ireland Ltd | Construction | 2021 |
| Bulgan Developments Ltd | Construction | 2019 |
| Bunzys Bakery Ltd | Manufacturing | 2024 |
| Burger Burger Takeaways Ltd | Hospitality | 2020 |
| Burleigh Heads Ltd | Financial services | 2022 |
| Burnbrae Ltd | Health & social care | 2019 |
| Burrows Engineering Racing Limited | Arts & recreation | 2018 |
| Burrows International Ltd | Transport & logistics | 2019 |
| Burrows Trading Ltd | Water & waste | 2012 |
| Bush Engineering Ltd | Professional & scientific | 2020 |
| Busy Kids Daycare Ltd | Other services | 2012 |
| BWT Food Ltd | Hospitality | 2025 |
| BWT Property Holding Ltd | Financial services | 2026 |
| BWT Single PLY Roofing Ltd | Construction | 2025 |
| BWT Single Roof PLY Ltd | Construction | 2020 |
| C & a Stay Ltd | Hospitality | 2022 |
| C & R Mccartan Ltd | Construction | 2010 |
| C & R Mccourt Holdings Ltd | Financial services | 2022 |
| C a Cabs Limited | Transport & logistics | 2003 |
| C F Tennyson Plant Limited | Construction | 2018 |
| C J Mcivor & Sons Ltd | Construction | 2022 |
| C M Blasting Services Ltd | Manufacturing | 2020 |
| C M Plant Sales Ltd | Wholesale & retail | 2010 |
| C MC Rory Ltd | Wholesale & retail | 2019 |
| C Murphy Engineering Ltd | Construction | 2015 |
| C Q Wood Ltd | Real estate | 2022 |
| C R Houston Consulting Limited | Professional & scientific | 2021 |
| C Robinson Transport Ltd | Transport & logistics | 2017 |
| C&M Waste Machinery Ltd | Manufacturing | 2025 |
| C&R Allen Limited | Agriculture & fishing | 2011 |
| C-Tech Recruitment Ltd | Administrative & support | 2014 |
| C.C.M. (Consultants) Limited | Professional & scientific | 1973 |
| C.E.Q Services Ltd | Professional & scientific | 2014 |
| C.J. Assets Limited | Real estate | 2018 |
| C.R.F. Cummings Limited | Construction | 2011 |
| C.W.S (NI) Ltd | Manufacturing | 2013 |
| C2 Contracts Ltd | Construction | 2026 |
| C2 Joinery Ltd | Construction | 2022 |
| CA Promotions Limited | Administrative & support | 2005 |
| Cabins Direct Limited | Construction | 2026 |
| Cabintec Ltd | Manufacturing | 2021 |
| Cabragh Engineering Limited | Manufacturing | 2002 |
| Cadensa Limited | Information & communication | 2018 |
| Cadian Consultancy Ltd | Professional & scientific | 2025 |
| Cadian Feeds Limited | Agriculture & fishing | 2018 |
| Cadian Holdings Ltd | Financial services | 2024 |