| BP Foods (NI) Ltd | Manufacturing | 2013 |
| Bperfect Ltd | Wholesale & retail | 2014 |
| Bracken Ridge Living Ltd | Wholesale & retail | 2026 |
| Bradbury Place Developments Limited | Construction | 2019 |
| Bradley Forensics Ltd | Professional & scientific | 2022 |
| Brady Property Management Limited | Real estate | 2021 |
| Brain Corporation LLP | | 2016 |
| BRANDSPHERE2.0 Ltd | Wholesale & retail | 2025 |
| Bravestar Performance Ltd | Manufacturing | 2024 |
| Bravotango Holdings Ltd | Real estate | 2019 |
| Brawley Properties Limited | Real estate | 2007 |
| Breezemount Development Projects Limited | Construction | 2022 |
| Breezemount Group Holdings Limited | Financial services | 2021 |
| Breezemount Group Ltd | Professional & scientific | 2015 |
| Breezemount Home Delivery Ltd | Transport & logistics | 2015 |
| Breezemount RM Partnership LP | | 2025 |
| Breezemount Services Ltd | Transport & logistics | 2015 |
| Breezemount Transport Limited | Extraterritorial | 2012 |
| Brennans Automotive Repair Centre Ltd | Wholesale & retail | 2015 |
| Brentexd LP | | 2017 |
| Brewboss Cafe Ltd | Hospitality | 2024 |
| Brian Mccleary & Company Ltd | Health & social care | 2023 |
| Brick Sales (NI) Limited | Wholesale & retail | 2014 |
| Brick Sales Ltd | Wholesale & retail | 1989 |
| Brickfield House Ltd | Financial services | 2020 |
| Brightbridge Consulting Limited | Professional & scientific | 2025 |
| Brishey Wind Farm Limited | Energy | 2020 |
| Brisk Gold LP | | 2019 |
| BRO Properties Ltd | Extraterritorial | 2016 |
| Brogan Ventures Ltd | Financial services | 2016 |
| Brolly Healthcare Ltd | Wholesale & retail | 2025 |
| Brookhaven Development Limited | Construction | 2014 |
| Brookhill Farm Ltd | Agriculture & fishing | 2022 |
| Broomhedge Joinery Ltd | Manufacturing | 2001 |
| BRZ AS Limited | Financial services | 2025 |
| BRZ BS Limited | Financial services | 2025 |
| BRZ CRZ Limited | Financial services | 2025 |
| BRZ GP Limited | Financial services | 2025 |
| BRZ RS Limited | Financial services | 2025 |
| BS Space Limited | Professional & scientific | 2007 |
| BSD Training Limited | Education | 2016 |
| BTY Cosmetics NI Ltd | Wholesale & retail | 2015 |
| Buchanan Transport Ltd | Transport & logistics | 2022 |
| Buckland & Bradley Properties Limited | Construction | 2003 |
| Bufab Ireland Limited | Manufacturing | 2006 |
| Build Repair Maintain (NI) Ltd | Manufacturing | 2020 |
| Building Operating and Service Systems Ltd | Professional & scientific | 2024 |
| Building Safety Organisation Limited | Construction | 2023 |
| Bunkr Design & Property Ltd | Professional & scientific | 2025 |
| Bunn Medical Limited | Health & social care | 2010 |
| Burlins Limited | Transport & logistics | 1999 |
| Burnbrae Mews Management Co. Ltd. | Households | 2003 |
| Burnside Group Ltd | Financial services | 2025 |
| Business Advisory Solutions Limited | Professional & scientific | 2010 |
| Business Technologies (NI) Ltd | Information & communication | 2010 |
| Business Trading (UK) LLP | | 2024 |
| Buy Direct Online UK Ltd | Hospitality | 2014 |
| Byrne Smart Solutions Limited | Information & communication | 2020 |
| Byte Block Builders Limited | Information & communication | 2024 |
| C & Z Group Limited | Wholesale & retail | 2022 |
| C a Services (NI) Limited | Construction | 2012 |
| C M Property Limited | Real estate | 2026 |
| C N C Tool & DIE Limited | Manufacturing | 2005 |
| C R Lowry Holdings Ltd | Real estate | 2014 |
| C R Lowry the Jewellers Ltd | Wholesale & retail | 2014 |
| C Richardson Ventures Ltd | Other services | 2026 |
| C&C Clearance Ltd | Water & waste | 2022 |
| C.P. O'Hare & Company Ltd | Construction | 2005 |
| C3 Architects LLP | | 2010 |
| CAC Construction Ltd | Construction | 2020 |
| Cadmore Limited | Professional & scientific | 2016 |
| Cafe Square Bistro Ltd | Hospitality | 2023 |
| CAFE15 Ltd | Hospitality | 2023 |
| Cage Conflict Ltd | Arts & recreation | 2021 |
| Caldera TAN Limited | Hospitality | 2014 |
| California Kitchen Co (NI) Ltd | Hospitality | 2017 |
| Callum Wilson Ltd | Health & social care | 2013 |
| CAM Burn Wind Farm Limited | Energy | 2021 |
| Camlin Energy (GAS) Limited | Manufacturing | 2017 |
| Camlin Limited | Manufacturing | 2009 |
| Camlin Power Limited | Professional & scientific | 2011 |
| Camlin Rail Limited | Manufacturing | 2012 |
| Camlin Sensor Technologies Limited | Professional & scientific | 2011 |
| Camlin Technologies Limited | Manufacturing | 2012 |
| Campbell and Caher Limited | Professional & scientific | 2012 |
| Campbell Engineering Supplies Ltd | Wholesale & retail | 2012 |
| Campbell Trawlers Ltd | Agriculture & fishing | 2014 |
| Campbells Carpets Ltd | Wholesale & retail | 2017 |
| Canada Immigration Solutions Ltd | Other services | 2014 |
| Canal Boxing Academy Sports Hub Limited | Arts & recreation | 2024 |
| Canice Consulting Limited | Professional & scientific | 2014 |
| Canonmills Accounting Ltd | Professional & scientific | 2021 |
| Capatana Transport Ltd | Transport & logistics | 2026 |
| Caplecure Ltd | Wholesale & retail | 2021 |
| Capstar Management Group Limited | Professional & scientific | 2017 |
| Car Co Belfast Ltd | Wholesale & retail | 2024 |
| Car Eager Limited | Wholesale & retail | 2026 |
| Cardiac Diagnostic Services Ltd | Health & social care | 2022 |
| Careve Limited | Professional & scientific | 1991 |
| Carisma Properties Limited | Construction | 2002 |