| Ballylesson Poultry Limited | Agriculture & fishing | 2012 |
| Ballylig Holdings | Financial services | 2020 |
| Ballymacaldrick Construction Limited | Construction | 2013 |
| Ballymacaldrick Group Ltd | Financial services | 2026 |
| Ballymacdoe Limited | Real estate | 2022 |
| Ballymarlow & District Community Group | Other services | 2011 |
| Ballymartin Investment Limited | Real estate | 2021 |
| Ballymena Area Children's Contact Centre | Health & social care | 2002 |
| Ballymena Autoparts | Wholesale & retail | 2023 |
| Ballymena BID Limited | Other services | 2015 |
| Ballymena Block Management Limited | Real estate | 2016 |
| Ballymena Community Clusters Renewable Energy Project C.I.C. | Energy | 2018 |
| Ballymena Dentalcare Ltd | Health & social care | 2021 |
| Ballymena Domiciliary Specsavers Limited | Wholesale & retail | 2016 |
| Ballymena Eats Ltd | Hospitality | 2021 |
| Ballymena Family & Addicts Support Group | Health & social care | 2005 |
| Ballymena Investment Centre Limited | Financial services | 2014 |
| Ballymena Meats Ltd | Agriculture & fishing | 2016 |
| Ballymena Mechanical Limited | Construction | 2024 |
| Ballymena Mortgage & Financial Services Ltd | Financial services | 2023 |
| Ballymena Nails & Spa Ltd | Other services | 2024 |
| Ballymena on Air Limited | Information & communication | 2019 |
| Ballymena Pet Vets Limited | Professional & scientific | 2019 |
| Ballymena Property Letting Ltd | Real estate | 2024 |
| Ballymena Service Centre Ltd | Wholesale & retail | 2025 |
| Ballymena United Football Club Limited | Arts & recreation | 1994 |
| Ballyprint.Com Ltd | Manufacturing | 2013 |
| Ballyreagh House Collection Ltd | Wholesale & retail | 2023 |
| Ballyreagh House Limited | Manufacturing | 2016 |
| Ballyton Limited | Professional & scientific | 2022 |
| Balurig Limited | Administrative & support | 2018 |
| Bankhead Landfill Site Ltd | Water & waste | 2021 |
| Bankhead Services Ltd | Administrative & support | 2008 |
| Banncoff Ltd | Financial services | 2026 |
| Bannvalley Consulting Services Ltd | Professional & scientific | 2022 |
| Bannview Studios Limited | Manufacturing | 2022 |
| Barbara Campbell Training & Consultancy Ltd | Professional & scientific | 2018 |
| Barnbarn Limited | Financial services | 2025 |
| Barrtec Ltd | Administrative & support | 2021 |
| Baytown Properties Limited | | 2005 |
| BB Content Enterprises Ltd | Information & communication | 2024 |
| BD Joinery & Construction Limited | Construction | 2021 |
| Bearded Monster SFX Ltd | Information & communication | 2024 |
| Beat Street Ltd | Wholesale & retail | 2004 |
| Beauty Web Solution Limited | Wholesale & retail | 2019 |
| Becalm Agencies Limited | Wholesale & retail | 2010 |
| Beechfield Farms Ltd | Agriculture & fishing | 2016 |
| Beechfield Holdings Ltd | Manufacturing | 2024 |
| Beechwood Management Company (NI) Limited | Real estate | 2013 |
| Beinn Vista Limited | Wholesale & retail | 2021 |
| Belfast Holdings Limited | Financial services | 2022 |
| Belfast Medical Training Academy Limited | Health & social care | 2024 |
| Belfast Property Meet Ltd | Education | 2021 |
| Belfastpropertymanagement Limited | Real estate | 2016 |
| Bellair Homes Ltd | Construction | 2013 |
| Bellis House (N.I.) Ltd | Hospitality | 2021 |
| Bells Heating & Plumbing Limited | Construction | 2023 |
| Belton Strategic Marketing Ltd | Professional & scientific | 2025 |
| Benbrook Ltd | Construction | 2009 |
| Benmacdui Ltd | Health & social care | 2020 |
| Benvardin Holdings Ltd | Wholesale & retail | 2025 |
| Bespoke Sill Capping Limited | Manufacturing | 2024 |
| Best Buys Better Deals Ltd | Wholesale & retail | 2021 |
| Betania Belfast Ltd | Other services | 2022 |
| Better Candies Ltd | Wholesale & retail | 2026 |
| Beyondhr Ltd | Professional & scientific | 2019 |
| Beyoutiful Moments Photography Ltd | Arts & recreation | 2015 |
| Big Al's Pizza Limited | Extraterritorial | 1990 |
| Big Bears Pizza Shack Limited | Hospitality | 2021 |
| Big Occasions Limited | Hospitality | 2012 |
| Bigdoc Developments NI Limited | Construction | 2021 |
| Birch Gardens Company Limited | Financial services | 2015 |
| Bishops Auto Services Limited | Wholesale & retail | 2026 |
| BJA Contracts Limited | Construction | 2015 |
| BK Electrical Services Ltd | Construction | 2023 |
| Black Rock Hotels (2) Limited | Hospitality | 2023 |
| Black Rock Hotels Holdco Limited | Hospitality | 2019 |
| Black Rock Hotels Limited | Hospitality | 2014 |
| Blackabbey Productions Ltd | Information & communication | 2024 |
| Blackbridge Poultry Limited | Agriculture & fishing | 2022 |
| Blackline Logistics Ltd | Transport & logistics | 2026 |
| Blacksgrove 1968 Limited | Extraterritorial | 2013 |
| Blair International Ltd | Transport & logistics | 2017 |
| Blaney Construction Ltd | Construction | 2006 |
| Blaney Gears Ltd | Manufacturing | 2011 |
| Blappy Productions Limited | Information & communication | 2023 |
| Blcc Ltd | Agriculture & fishing | 2016 |
| Blim Limited | Administrative & support | 2022 |
| Bliss Patisserie Ltd | Wholesale & retail | 2024 |
| Blokart World LLP | | 2013 |
| Bluefox (N.I.) Limited | Professional & scientific | 2018 |
| Bmcl Contracts Ltd | Construction | 2026 |
| Bmcl Roofing Ltd | Construction | 2019 |
| BME Electrical (NI) Limited | Construction | 2012 |
| BME Enclosures (NI) Ltd | Manufacturing | 2023 |
| BNB Coffee Ltd | Hospitality | 2026 |
| Boal Anderson & Co. Ltd | Professional & scientific | 2012 |
| BOB & Berts Belfast Limited | Hospitality | 2018 |
| BOB & Berts Blackpool Limited | Hospitality | 2023 |
| BOB & Berts Bury Limited | Hospitality | 2021 |