| Bardon Leisure Lanarkshire Limited | Arts & recreation | 2015 |
| Bare Aesthetics MMC Ltd | Health & social care | 2026 |
| Bark N Go Ltd | Other services | 2023 |
| Barkers Road Poultry Limited | Extraterritorial | 2025 |
| Barlane Building Ltd | Administrative & support | 2022 |
| Barmcm Limited | Construction | 2019 |
| Barney O'Hare Limited | Arts & recreation | 2021 |
| Barnlough Limited | Hospitality | 2023 |
| Barnmeen Agri Limited | Agriculture & fishing | 2015 |
| Barry Magill Financial Services Ltd | Financial services | 2012 |
| Barry Murray Building and Maintenance Ltd | Construction | 2026 |
| Barry Owens Consulting Limited | Professional & scientific | 2016 |
| Bartholomew Holdings (NI) Ltd. | Professional & scientific | 2002 |
| Barview House Ltd | Other services | 2017 |
| Basin Subs Ltd | Hospitality | 2023 |
| Bath & Tile Gallery Limited | Wholesale & retail | 2024 |
| Bathquip Limited | Wholesale & retail | 2018 |
| Batum Consulting LP | | 2017 |
| Bavan Contracts Limited | Construction | 2006 |
| Bavanmore Farm Limited | Agriculture & fishing | 2012 |
| Bawnless Recruitment Limited | Administrative & support | 2003 |
| Bay ST Louis Holdings Limited | Financial services | 2023 |
| Baymount Holdings Ltd | Professional & scientific | 2025 |
| Bayview Apartments Limited | Households | 1998 |
| Bayview Contracts Ltd | Construction | 2001 |
| Bayview Greenisland Management Company Limited | Households | 2004 |
| BB Blinds & Interiors Limited | Wholesale & retail | 2019 |
| BB Enviro Property Ltd | Real estate | 2025 |
| BC Auto Sales and Repairs Ltd | Water & waste | 2016 |
| BC GAS Heating Ltd | Construction | 2024 |
| BCG Breakers Limited | Wholesale & retail | 2016 |
| Bcon Engineering Limited | Construction | 2025 |
| Bctw Limited | Hospitality | 2021 |
| BD Consulting Engineering Ltd | Professional & scientific | 2025 |
| BDC Property Ltd | Hospitality | 2018 |
| BDS Global Security Limited | Administrative & support | 2015 |
| BDW Construction Limited | Construction | 2008 |
| BE Beautiful Poyntzpass Ltd | Other services | 2021 |
| Beachside Management Company Limited | Households | 2017 |
| Bean & Brewed (Warrenpoint) Ltd | Hospitality | 2025 |
| Bear Dearg Ltd | Professional & scientific | 2016 |
| Beard OIL Company Limited | Manufacturing | 2015 |
| Beaudain Ltd | Financial services | 2025 |
| Beautifully Blemished Ltd | Other services | 2024 |
| Beautifying Secrets Limited | Administrative & support | 2019 |
| Beauty and the Bump Maternity Limited | Wholesale & retail | 2019 |
| Beauty by Buttercups Ltd | Other services | 2013 |
| Beauty by MD Ltd | Other services | 2019 |
| Beauty First Laser Limited | Other services | 2025 |
| Beauty on the Loft Ltd | Other services | 2013 |
| Beauty Savers International UK Limited | Wholesale & retail | 2024 |
| Bechtle Direct (NI) Limited | Wholesale & retail | 2016 |
| Bedo Xpress Ltd | Transport & logistics | 2025 |
| Bedrock Landlord Services Ltd | Administrative & support | 2026 |
| Beech Meadows Management Ltd | Households | 2007 |
| Beechfield Agri Limited | Financial services | 2025 |
| Beechfinch Limited | Agriculture & fishing | 1993 |
| Beechvale (N.I.) Ltd | Wholesale & retail | 2011 |
| Beechwood Embroidery Ltd | Manufacturing | 2021 |
| Beer Jochen Limited | Wholesale & retail | 2024 |
| Befit Lifestyle Limited | Information & communication | 2015 |
| Begney Meats Ltd | Hospitality | 2009 |
| Behamp NI Limited | Real estate | 2023 |
| Belbridge Enterprise Ltd | Wholesale & retail | 2023 |
| Belfast Orthodontic Clinic Ltd | Health & social care | 2013 |
| Belfast Private Oncology Limited | Health & social care | 2018 |
| Bella MIA Investments Ltd | Mining & quarrying | 2014 |
| Belle Beauty Armagh Limited | Other services | 2023 |
| Bellevue Belfast Ltd | Hospitality | 2025 |
| Bellevue Dairies Limited | Agriculture & fishing | 2021 |
| Bellfield Electrical Services Limited | Construction | 2019 |
| Belmont Construction (Newry) Ltd | Construction | 2025 |
| Belmore Farms Limited | Agriculture & fishing | 2015 |
| Belnew Developments Limited | Construction | 2020 |
| Belsize Meadows Management Limited | Households | 2007 |
| Belsize Mews Mangement Limited | Extraterritorial | 2006 |
| Belvedere Heights Management Company (N.I.) Ltd | Households | 2018 |
| Belvoir Logistics Ltd | Wholesale & retail | 2019 |
| BEN Electrics Ltd | Construction | 2021 |
| BEN Sands Music Limited | Arts & recreation | 2017 |
| BEN Wilson & Sons Ltd | Manufacturing | 2011 |
| Benagh Engineering & Motor Works Ltd | Manufacturing | 2003 |
| Benagh Property Management Limited | Households | 2022 |
| Benaroc Ltd | Wholesale & retail | 2025 |
| Benmore Contractors Limited | Manufacturing | 2019 |
| Benmore Property Management Services Limited | Real estate | 2011 |
| Bennett Farms Limited | Agriculture & fishing | 2016 |
| Bennett Painting Contracts Limited | Construction | 2017 |
| Bennett Painting Ltd | Construction | 2014 |
| Bentholm Universal L.P. | | 2015 |
| Bentley Instrument Company Limited | Manufacturing | 1994 |
| Beretta Consulting Ltd | Professional & scientific | 2025 |
| Bermack Contracts Ltd | Construction | 2022 |
| Bernadette Elizabeth Ltd | Wholesale & retail | 2021 |
| Bernard Dinsmore R.I.B.A Ltd | Professional & scientific | 2023 |
| Bernard Kavanagh & Sons (NI) Ltd | Transport & logistics | 2009 |
| Bernard Thomas Holdings Limited | Financial services | 2020 |
| Bernish Freight Limited | Transport & logistics | 2003 |
| Bernish View Traders (NI) Limited | Wholesale & retail | 2017 |
| Bernish View Traders Limited | Financial services | 2010 |