| Bangor Dental Care Ltd | Health & social care | 2012 |
| Bangor Development Co. Limited | Real estate | 1966 |
| Bangor Diocesan Board of Finance Bwrdd Cyllid Esgobaeth Bangor | Other services | 1998 |
| Bangor Diocesan Trust(The) | Other services | 1925 |
| Bangor Drama Club Ltd | Arts & recreation | 2015 |
| Bangor Feasts Limited | Hospitality | 2025 |
| Bangor Fence Company Ltd | Administrative & support | 2022 |
| Bangor Foodhub and Community Support Ltd | Health & social care | 2021 |
| Bangor Football and Athletic Club Limited | Arts & recreation | 1953 |
| Bangor Fuels Limited | Wholesale & retail | 2013 |
| Bangor Gymnastic Club | Arts & recreation | 2015 |
| Bangor Health Clinic Limited | Health & social care | 2015 |
| Bangor Homes Group Ltd | Real estate | 2023 |
| Bangor Marine Court Hotel Limited | Hospitality | 2000 |
| Bangor Medical Aesthetics Ltd | Real estate | 2018 |
| Bangor Mussel Producers Limited | Extraterritorial | 2008 |
| Bangor Nails 242 Ltd | Other services | 2026 |
| Bangor Nails CN Ltd | Other services | 2024 |
| Bangor NW Ltd | Hospitality | 2024 |
| Bangor Phone Shop Ltd | Wholesale & retail | 2021 |
| Bangor Pitstop Ltd | Hospitality | 2012 |
| Bangor Properties Limited | Households | 2024 |
| Bangor Repair Centre Limited | Wholesale & retail | 2025 |
| Bangor Repair Centre NW Ltd | Wholesale & retail | 2025 |
| Bangor Retail Ltd | Wholesale & retail | 2018 |
| Bangor Signage Print & Embroidery Limited | Professional & scientific | 2022 |
| Bangor Sports Grounds Services Ltd | Administrative & support | 2021 |
| Bangor Star Butcher Ltd | Wholesale & retail | 2025 |
| Bangor Tyre Service Ltd | Administrative & support | 2008 |
| Bangor University Students’ Union | Other services | 2018 |
| Bangor Valeting Centre Ltd | Other services | 2020 |
| Bangor Vineyard Church | Other services | 2018 |
| BANJAXED54 Ltd | Hospitality | 2024 |
| Bannon Walters International Limited | | 2006 |
| Bardsey Island Trust Limited(The) | Hospitality | 1977 |
| Barnrose Properties Limited | Real estate | 2002 |
| Bartley's Wood Management Company Limited | Households | 2004 |
| Barton & Nichols Limited | Wholesale & retail | 2003 |
| Basecamp Leisure Limited | Manufacturing | 2024 |
| Batt Property Ltd | Real estate | 2024 |
| Battersea Park Road London Limited | Construction | 2021 |
| Battys Nurseries Limited | Wholesale & retail | 2022 |
| Bay Property Limited | Real estate | 2025 |
| Bay Residence Ltd | Real estate | 2020 |
| Bayburn Adhd Ltd | Health & social care | 2025 |
| Bayhead Capital Management Limited | Professional & scientific | 2014 |
| Baylands Construction Ltd | Construction | 2001 |
| Baylands Management Company Limited | Extraterritorial | 2000 |
| Bayman Performance Ltd | Professional & scientific | 2019 |
| Baynes & SON Haulage Limited | Transport & logistics | 2003 |
| Bayprintni Ltd | Manufacturing | 2025 |
| Bayrock Capital Ltd | Real estate | 2015 |
| Bayside Design Limited | Wholesale & retail | 2017 |
| BBE 123 Ltd | Hospitality | 2025 |
| BC Hair and Beauty Ltd | Other services | 2019 |
| Bcal Ltd | Other services | 2022 |
| BD Catering Services Ltd | Hospitality | 2024 |
| BDR Management Consulting Ltd | Information & communication | 2022 |
| BE a Leader Limited | Professional & scientific | 2001 |
| Beachbuoy Ltd | Wholesale & retail | 2023 |
| Beannchor Systems Engineering Ltd | Public administration | 2022 |
| Bearmont Capital NO.2 Limited | Real estate | 2025 |
| Beau Bridges Hair Salon Ltd | Other services | 2015 |
| Beaufort Technologies Limited | Extraterritorial | 1997 |
| Beaumaris Marine Services Limited | Transport & logistics | 2013 |
| Beauty Launders Ltd | Other services | 2024 |
| Bebe Adrianos Mexicanos Ltd | Hospitality | 2025 |
| Beechfield Fairways Management Limited | Households | 2010 |
| Beechfield Farm Management Limited | Households | 2010 |
| Bees Designers Ltd | Information & communication | 2022 |
| Befikre Ltd | Transport & logistics | 2024 |
| Behaviour Stream Ltd | Professional & scientific | 2024 |
| Behind the Stable Door Ltd | Education | 2018 |
| Bejewel Joinery Limited | Manufacturing | 2016 |
| Belenos Limited | Construction | 2021 |
| Belfast Central Ltd | Hospitality | 2026 |
| Belfast Coffee Roasters (2026) Limited | Wholesale & retail | 2026 |
| Belgravia Engineering Consultancy Ltd | Professional & scientific | 2017 |
| Bella House Group Ltd | Hospitality | 2026 |
| Belle VUE Bangor Limited | Hospitality | 2013 |
| Bellevue Student Limited | Construction | 2014 |
| Belvedere Property Investments Ltd | Real estate | 2026 |
| Bems (SPV) Limited | Real estate | 2016 |
| BEN Close Hairdressing Limited | Other services | 2015 |
| BEN Johnston LX Ltd | Information & communication | 2025 |
| Bending Sound Ltd | Wholesale & retail | 2020 |
| Bennett Smith Limited | Professional & scientific | 2010 |
| Bereavement Services Limited | Other services | 2020 |
| Berllan Properties Limited | Real estate | 2007 |
| Berserker Entertainment Limited | Financial services | 2020 |
| Bert Craig Ltd | Wholesale & retail | 2025 |
| Berwyn Holdings Limited | Real estate | 2025 |
| Besda CYF | Information & communication | 2007 |
| Bespoke Candles Ltd | Manufacturing | 2020 |
| Bespokedjs Limited | Administrative & support | 2026 |
| Bethesda Chippy Ltd | Hospitality | 2020 |
| Bethesda Community Wholefoods CBC | Wholesale & retail | 2019 |
| Betta Choc Ltd | Manufacturing | 2026 |
| Bexley Studios and Productions Ltd | Real estate | 2022 |
| Bezco. Productions Ltd | Information & communication | 2025 |