| Ballymena GP Practice C.I.C. | Health & social care | 2023 |
| Ballymena Land Investment Company Limited - the | Real estate | 1884 |
| Ballymenoch Developments Ltd | Construction | 2019 |
| Ballymenoch Holdings Limited | Financial services | 2026 |
| Ballymoney Farms Limited | Wholesale & retail | 2025 |
| Ballymoney Property Company Ltd. | Health & social care | 2020 |
| Ballymount Ltd | Real estate | 2013 |
| Ballymullan Management Company Limited | Households | 2019 |
| Ballymullan Properties Limited | Real estate | 2026 |
| Ballynacross Wind Ltd | Energy | 2015 |
| Ballynafeigh Community Development Association | Other services | 2011 |
| Ballynafeigh Limited | Real estate | 2021 |
| Ballynahinch Building Supplies 14 Limited | Wholesale & retail | 2014 |
| Ballynahinch Wind Ltd | Energy | 2017 |
| Ballynoe Wind Ltd | Energy | 2015 |
| Ballynure Developments Limited | Construction | 2006 |
| Ballyoran Heights Management Company Limited | Real estate | 2021 |
| Ballyowen Eyecare Limited | Health & social care | 2008 |
| Ballypitmave Community Development Ltd | Education | 2023 |
| Ballyquinn Properties Limited | Construction | 2009 |
| Ballyregan Apartments Ltd | Households | 2004 |
| Ballyriff Healthcare Ltd | Wholesale & retail | 2011 |
| Ballyrobert Retail Ltd | Wholesale & retail | 2018 |
| Ballyrogan Finance Limited | Extraterritorial | 2007 |
| Ballysallagh Consultants Ltd | Financial services | 2025 |
| Ballysillan Community Initiatives | Other services | 1997 |
| Ballysillan Pharmacy Ltd | Other services | 2003 |
| Ballysillan Properties LLP | | 2006 |
| Ballysillan Youth for Christ | Other services | 2017 |
| Ballystrew Properties Ltd | Construction | 2023 |
| Ballytromery Mews Management Company Ltd | Households | 2017 |
| Ballyvale Consulting Limited | Professional & scientific | 2020 |
| Ballyveagh Estates Limited | Construction | 2017 |
| Ballyvester Property Services Ltd | Real estate | 2021 |
| Ballywalter Pharmacy Limited | Health & social care | 2013 |
| Ballyward Developments Limited | Construction | 2018 |
| Balmain Estates Limited | Financial services | 2017 |
| Balmoral BID Consulting Ltd | Professional & scientific | 2015 |
| Balmoral Construction (N.I.) Limited | Construction | 2017 |
| Balmoral Decorators Ltd | Construction | 2018 |
| Balmoral Grange Belfast Management Limited | Households | 2013 |
| Balmoral Healthcare Holdings Ltd | Financial services | 2021 |
| Balmoral Homecare Agency Ltd | Health & social care | 2024 |
| Balmoral Manor Residents Limited | Households | 1989 |
| Balmoral Mews Management Limited | Households | 1984 |
| Balmoral Park Gardens (Belfast) Limited | Households | 2016 |
| Balmoral Textiles Limited | Wholesale & retail | 1998 |
| Balmoral View Management Company Limited | Households | 2007 |
| Balnaforge Limited | Real estate | 2009 |
| Balog Kitty Ltd | Wholesale & retail | 2024 |
| Baltic B Enterprises Limited | Wholesale & retail | 2012 |
| Baltimore Jacks Limited | Real estate | 2002 |
| BAM Contractors (N.I.) Ltd | Construction | 2010 |
| BAM Investire Limited | Financial services | 2023 |
| Bamar Care Limited | Health & social care | 2020 |
| Bamberg Limited | Agriculture & fishing | 2009 |
| Bambino BT12 Ltd | Hospitality | 2025 |
| Bamboo Rose Ltd | Information & communication | 2017 |
| Bamboo Takeaway Belfast Ltd | Hospitality | 2023 |
| Bamlo Limited | Financial services | 2022 |
| Bamz Solutions & Management CIC | Professional & scientific | 2024 |
| BAN & Beyond Property Limited | Real estate | 2025 |
| BAN Normality Consultancy Ltd | Professional & scientific | 2016 |
| Banana Frank Ltd | Other services | 2026 |
| Banana Peaks Limited | Manufacturing | 2024 |
| Banana Web Solutions Limited | Information & communication | 2025 |
| Banbha Ltd | Hospitality | 2025 |
| Banbridge Hand Car Wash Ltd | Wholesale & retail | 2025 |
| Banbridge Pet Vets Ltd | Professional & scientific | 2021 |
| Band of Brothers (GA) Ltd | Other services | 2025 |
| Bandit Plates Ltd | Manufacturing | 2025 |
| Bane Retail Limited | Information & communication | 2022 |
| Bangla Bazar (Ormeau) Ltd | Wholesale & retail | 2026 |
| Bangor Acceptances Limited | Extraterritorial | 1982 |
| Bangor and Nendrum Schools Services Holdings Limited | Professional & scientific | 2005 |
| Bangor and Nendrum Schools Services Limited | Professional & scientific | 2005 |
| Bangor Autoparts Limited | Wholesale & retail | 1986 |
| Bangor Bengal (N.I.) Limited | Hospitality | 2017 |
| Bangor Blue Slate Co Limited | Extraterritorial | 2010 |
| Bangor Eats Limited | Hospitality | 2021 |
| Bangor Holdings Limited | Wholesale & retail | 2024 |
| Bangor Hospitality Ltd | Hospitality | 2024 |
| Bangor Marine Limited | Construction | 2019 |
| Bangor Quays Limited | Real estate | 2020 |
| Bangor Smiles Ltd | Health & social care | 2013 |
| Bangor Steel Fabrications Limited | Manufacturing | 2009 |
| Bangor Victoria LLP | | 2007 |
| Bangor West Limited | Construction | 2005 |
| Bankcheck Limited | Financial services | 2003 |
| Bankmore Investments Limited | Professional & scientific | 2001 |
| Bann Media Limited | Information & communication | 2021 |
| Bann Power Limited | Construction | 2018 |
| Bann Services Limited | Construction | 2018 |
| Bannister Macmillan Ltd | Wholesale & retail | 2024 |
| Bannon & Bannon Property (Commercial) Ltd | Real estate | 2022 |
| Bannon & Bannon Property Holdings Ltd | Hospitality | 2016 |
| Bannon & Bannon Property Ltd | Construction | 2017 |
| Bannon and Bannon Holdings Ltd | Hospitality | 2025 |
| Bannon and Bannon Property (Commercial) 4 Limited | Financial services | 2025 |
| Bannon and Bannon Property (Commercial) 5 Ltd | Financial services | 2025 |