| Belgium Nomic Special Fertilizer Co., Ltd | Extraterritorial | 2021 |
| Belgrave Court Cardiff Limited | Households | 1971 |
| Belgrave Lettings Ltd | Real estate | 2018 |
| Belgravia Group Ltd | Administrative & support | 2015 |
| Belgravia ROW Ltd | Real estate | 2025 |
| Belhool Ltd | Professional & scientific | 2025 |
| Beliani (UK) Ltd | Wholesale & retail | 2018 |
| Belico Ltd | Information & communication | 2015 |
| Believe Network London Ltd | Professional & scientific | 2020 |
| Believin Technology Co., Ltd | Mining & quarrying | 2026 |
| Belinda Laboratories LLP | | 2010 |
| Bell Duty Limited | Information & communication | 2025 |
| Bell IT & Management Consultancy Ltd | Information & communication | 2020 |
| Bell Tech Trading Ltd | Wholesale & retail | 2025 |
| Bella & Beau Ltd | Wholesale & retail | 2022 |
| Bella Beauty 4U Ltd | Other services | 2019 |
| Bella Vista Catering Ltd | Hospitality | 2016 |
| Bella's Baguettes Ltd | Hospitality | 2019 |
| Bellastella Limited | Extraterritorial | 2019 |
| Bellasun Company PC | | 2017 |
| Bellavista Care (Cardiff) Limited | Health & social care | 2015 |
| Bellavista Properties and Investment Limited | Real estate | 2024 |
| Bellbase Limited | Hospitality | 2018 |
| Belle View Residents Management Company Limited | Households | 2006 |
| Belle Visage Cardiff Ltd | Administrative & support | 2016 |
| Belle VUE South Wales Ltd | Health & social care | 2003 |
| Bellecote Limited | Wholesale & retail | 2016 |
| Belleli Engineering & Infrastructure Limited | Other services | 2018 |
| Bellhart Company Ltd | Wholesale & retail | 2026 |
| Bellido Holdings SA Ltd | Information & communication | 2026 |
| Belling & Co. Limited | Manufacturing | 1935 |
| Bellis-Elkin Limited | Health & social care | 2022 |
| Bellmore Limited | Wholesale & retail | 2017 |
| Bells Consulting Limited | Other services | 2018 |
| Bells Incorporated Limited | Transport & logistics | 1994 |
| Bellveri Ltd | Wholesale & retail | 2024 |
| Bellvis Construction Ltd | Construction | 2025 |
| Bellybambino Ltd | Manufacturing | 2019 |
| Bellzy Hair and Henna Beautician Ltd | Other services | 2017 |
| Belmont House (Tenby) Management Ltd | Real estate | 2018 |
| Belmous Group Ltd | Other services | 2025 |
| Belns Melns Lighting Ltd | Wholesale & retail | 2021 |
| Belo Real Estate Limited | Real estate | 2013 |
| Belsoq Ltd | Other services | 2025 |
| Belt & Braces PR Ltd | Professional & scientific | 2014 |
| Beltcup Services Ltd | Wholesale & retail | 2022 |
| Beluga Estates Limited | Households | 2021 |
| Belvarion Ltd | Education | 2025 |
| Belvedere Business Solution Ltd | Transport & logistics | 2011 |
| Belvena PC | | 2018 |
| Bely Ltd | Wholesale & retail | 2025 |
| Bemac Limited | Professional & scientific | 2000 |
| Bemaco Holding Limited | Professional & scientific | 1991 |
| Bemart Limited | Wholesale & retail | 2024 |
| BEN (Ledbury) Ltd | Hospitality | 2026 |
| BEN Allal Limited | Information & communication | 2025 |
| BEN Everett Lighting Ltd | Arts & recreation | 2017 |
| BEN Gooding Sports Massage Ltd | Arts & recreation | 2018 |
| BEN Llewellyn Limited | Manufacturing | 2025 |
| BEN Luke-Jeavons Limited | Wholesale & retail | 2025 |
| BEN Rogers in Consultancy Services Ltd | Education | 2025 |
| BEN Sharif Limited | Health & social care | 2026 |
| BEN Stew Limited | Health & social care | 2018 |
| BEN Watts Catering Ltd | Hospitality | 2021 |
| Ben-Well Cardiff Ltd | Hospitality | 2026 |
| Benagency Ltd | Wholesale & retail | 2024 |
| Benbakir Algeria Sport Ltd | Wholesale & retail | 2024 |
| Benbob Developments Limited | Construction | 2017 |
| Bench Logic Saas Limited | Information & communication | 2025 |
| Bencharef Ghadri Limited | Education | 2025 |
| Benchmark Innovatiions Ltd. | Hospitality | 2017 |
| Benchmark Site Services Ltd | Construction | 2020 |
| Bendall Project Management Limited | Administrative & support | 2015 |
| Bendfun IT Solutions Ltd | Information & communication | 2014 |
| Bendigidol CYF | Information & communication | 2014 |
| Bendricks Properties Limited | Construction | 2013 |
| Bendy Brothers Ltd | Wholesale & retail | 2025 |
| Benecrofte Ltd | Other services | 2020 |
| Benedict Court (Pentyrch) Management Limited | Households | 2017 |
| Benedito's Limited | Wholesale & retail | 2002 |
| Benefactum Limited | Professional & scientific | 2021 |
| Benefit Homes Ltd | Real estate | 2026 |
| Benefit Trade Ltd | Wholesale & retail | 2026 |
| Benefitsconnect Ltd | Financial services | 2014 |
| Benfatto PPM Academy Ltd | Information & communication | 2025 |
| Benfirela Ltd | Professional & scientific | 2026 |
| Benford & Brothers Ltd | Real estate | 2026 |
| Benford Capital LLP | | 2025 |
| Bengal Dragons C.I.C. | Other services | 2025 |
| Bengal Handi Limited | Hospitality | 2025 |
| Benham Architects Limited | Professional & scientific | 2016 |
| Benito Homes Limited | Construction | 2022 |
| Benj Ventures Ltd | Professional & scientific | 2018 |
| Benjamin Barks Limited | Information & communication | 2019 |
| Benjamin House Ltd | Financial services | 2024 |
| Benjamin Wachenje Studio Ltd | Arts & recreation | 2006 |
| Benji Pottery Ltd | Manufacturing | 2025 |
| Benjisss Ltd | Wholesale & retail | 2025 |
| Benlaxel LLP | | 2025 |
| Bennani Brother Ltd | Other services | 2025 |