| Banstead Holdings Limited | Real estate | 2020 |
| Banwen Homes Ltd | Real estate | 2025 |
| Banwen Ltd | Construction | 2019 |
| Banz Services Limited | Transport & logistics | 2022 |
| Bar Coucou Ltd | Hospitality | 2024 |
| Barakogym Limited | Wholesale & retail | 2023 |
| Barati Limited | Wholesale & retail | 2025 |
| Barberhood Limited | Other services | 2019 |
| Barberjay Male Grooming Ltd | Other services | 2024 |
| Barbican Logistics Investments Limited | Financial services | 2018 |
| Bard Enterprises Ltd | Administrative & support | 2023 |
| Bardley Limited | Wholesale & retail | 2026 |
| Bareilly Shop Ltd | Manufacturing | 2019 |
| Bargain Goods Ltd | Wholesale & retail | 2019 |
| Bargain Pound World Ltd | Wholesale & retail | 2016 |
| Bargain Twist MCR Ltd | Wholesale & retail | 2015 |
| Bargoed Estates Ltd | Other services | 2018 |
| Barkat Knitwear MFG. Co. Limited | Manufacturing | 1968 |
| Barkat Traders Limited | Wholesale & retail | 2016 |
| Barkz 'N' Bubblez Limited | Other services | 2023 |
| Barlborough Estates Limited | Real estate | 2026 |
| Barlborough Estates SUB Limited | Real estate | 2026 |
| Barlinda Leather Goods Limited | Wholesale & retail | 1983 |
| Barlow Finance Limited | Professional & scientific | 2014 |
| Barnaby Properties Limited | Real estate | 1987 |
| Barnes Legal Services Limited | Professional & scientific | 2022 |
| Barnford Estates Ltd | Extraterritorial | 2012 |
| Barnsfold Limited | Real estate | 1982 |
| Barnsley Estate Management Limited | Other services | 2017 |
| Barnsley Estates Ltd | Extraterritorial | 2025 |
| Barnsley Securities 2 Limited | Real estate | 2020 |
| Barnsley Securities Limited | Real estate | 2020 |
| Barny BEE TV Ltd | Information & communication | 2026 |
| Barony Universal Products Limited | Manufacturing | 2025 |
| Barrmona Holdings Ltd | Financial services | 2019 |
| Barrow Estates Ltd | Other services | 2017 |
| Barry and SON Limited | Manufacturing | 1965 |
| Bartletts Building Limited | Construction | 2003 |
| Barton Quarter Horwich SPV Limited | Real estate | 2025 |
| Barton Quarter Investment Co Limited | Real estate | 2026 |
| Barton Upon Humber Estates Limited | Other services | 2019 |
| Barton Upon Humber Holdings Limited | Other services | 2019 |
| Bartspeedtrans Ltd | Transport & logistics | 2015 |
| BAS Levana Ltd | Professional & scientific | 2022 |
| BAS Levana Properties Ltd | Real estate | 2022 |
| Base and Body Ltd | Wholesale & retail | 2024 |
| Base Security Services Ltd | Administrative & support | 2019 |
| Bash Holdings Ltd | Wholesale & retail | 2020 |
| Batalveez Ltd | Wholesale & retail | 2013 |
| Batchelor Clothing Ltd | Wholesale & retail | 2025 |
| Batt Cables Limited | Wholesale & retail | 2026 |
| Baxendale Mason Limited | Administrative & support | 2018 |
| Baxter BIN Wash Ltd | Administrative & support | 2023 |
| Bay International Services Limited | Professional & scientific | 2025 |
| Bayat Joinery Ltd | Construction | 2026 |
| Bays Hamedrash Eitz Chaim Limited | Other services | 2016 |
| Bayview Associates Ltd | Other services | 2018 |
| Bazing Limited | Information & communication | 2025 |
| BBA Aesthetics Clinic Ltd | Other services | 2025 |
| Bbdiner Limited | Hospitality | 2019 |
| Bbfp (Holdings) Limited | Extraterritorial | 2025 |
| Bbfp Property Limited | Extraterritorial | 2025 |
| BBM Estates Ltd | Real estate | 2024 |
| Bbqvillage Limited | Hospitality | 2020 |
| BBS Window Solutions Ltd | Manufacturing | 2016 |
| BC Community Limited | Education | 2022 |
| Bcim Ltd | Financial services | 2026 |
| Bcmcr Limited | Hospitality | 2024 |
| Bcps 2 Limited | Real estate | 2025 |
| Bcps 3 Ltd | Real estate | 2025 |
| Bcps 4 Ltd | Real estate | 2026 |
| Bcps London Holding LLP | | 2025 |
| Bcsalford Limited | Hospitality | 2025 |
| BCSM1 Ltd | Real estate | 2026 |
| BE Finest Ltd | Professional & scientific | 2022 |
| BE Sustainable Limited | Professional & scientific | 2019 |
| Beachgold Properties Ltd | Real estate | 1998 |
| Beacon Integrated Care Ltd | Health & social care | 2025 |
| Beaden Capital Limited | Professional & scientific | 2018 |
| Bealey 7 Nominees Limited | Extraterritorial | 2019 |
| Bear & Whale Films Limited | Information & communication | 2023 |
| Bear Mordechai Limited | Real estate | 1982 |
| Bear Property Management Services Limited | Real estate | 2024 |
| Beatco Ltd | Information & communication | 2025 |
| Beatdibs Ltd | Information & communication | 2025 |
| Beaumont Dental Limited | Health & social care | 2018 |
| Beaumont Dental Salford Limited | Health & social care | 2011 |
| Beaustay Properties Ltd | Hospitality | 2025 |
| Beautee for Ashes C.I.C. | Health & social care | 2024 |
| Beauty Atelier by Paula Tanda Ltd | Extraterritorial | 2022 |
| Beauty by A&M Limited | Other services | 2025 |
| Beauty by Sammiana Ltd | Other services | 2024 |
| Beauty by Zero Limited | Wholesale & retail | 2020 |
| Beauty Finds Ltd | Wholesale & retail | 2026 |
| Beauty Guru Salons Ltd | Other services | 2016 |
| Beauty Hour Ltd | Wholesale & retail | 2023 |
| Beautyexpert Ltd | Wholesale & retail | 2024 |
| Beautynailsbyab Limited | Other services | 2025 |
| BEAUTYSUPPLIES208 Limited | Wholesale & retail | 2026 |
| Beavs Consultancy Ltd | Professional & scientific | 2025 |