| Butilas Construction Ltd | Construction | 2020 |
| Butt Brand Ltd | Manufacturing | 2025 |
| Butt Halal Meat Limited | Wholesale & retail | 2010 |
| Butt Property Investment Limited | Real estate | 2016 |
| Butterfly Picture Frame Ltd | Other services | 2018 |
| Butv Ltd | Transport & logistics | 2026 |
| Buxpro Limited | Wholesale & retail | 2024 |
| Buxxon Limited | Wholesale & retail | 2023 |
| Buy & LET Properties Ltd | Real estate | 2026 |
| Buy Best Car Ltd | Wholesale & retail | 2025 |
| Buy Bliss Limited | Wholesale & retail | 2025 |
| Buy Refurb & Refinance Ltd | Real estate | 2022 |
| Buy Side Advisory Limited | Professional & scientific | 2024 |
| Buy Stussy Hoodie Limited | Wholesale & retail | 2025 |
| Buy the DIP Ltd | Financial services | 2021 |
| Buy This REG Ltd | Wholesale & retail | 2023 |
| Buy With US PK Ltd | Wholesale & retail | 2023 |
| Buyerbox Ltd | Wholesale & retail | 2023 |
| Buyify Ltd | Wholesale & retail | 2025 |
| Buying Craze Ltd | Wholesale & retail | 2024 |
| Buyinuk Ltd | Wholesale & retail | 2025 |
| Buysellwithiman Ltd | Wholesale & retail | 2026 |
| Buyve Ltd | Wholesale & retail | 2024 |
| Buywell Limited | Extraterritorial | 1995 |
| Buyzo Corporations Ltd | Wholesale & retail | 2025 |
| Buyzze Limited | Wholesale & retail | 2025 |
| Buza Youth Football Club CIC | Arts & recreation | 2025 |
| Buza Youth Limited | Arts & recreation | 2023 |
| Buzz IT Solutions Ltd | Information & communication | 2023 |
| Buzzavan Ltd | Transport & logistics | 2018 |
| Buzzcentric Ltd | Information & communication | 2024 |
| Buzzozo Ltd | Information & communication | 2024 |
| BV Engineers Limited | Construction | 2013 |
| Bv's Management Service Ltd | Professional & scientific | 2025 |
| BVB Properties Limited | Real estate | 2019 |
| BVB Property Investments Limited | Real estate | 2020 |
| BVP Drylining Ltd | Construction | 2022 |
| BVS Tiling Ltd | Construction | 2026 |
| Bvsi Consultants Ltd | Professional & scientific | 2020 |
| BW East Ltd | Real estate | 2018 |
| BW Solicitors Ltd | Professional & scientific | 2020 |
| BWC Windows Ltd | Construction | 2018 |
| BWD Patties Ltd | Wholesale & retail | 2023 |
| BWD Transport Ltd | Transport & logistics | 2018 |
| BWL Trade UK Ltd | Wholesale & retail | 2025 |
| BWP Autos Limited | Wholesale & retail | 2020 |
| BWY Fragrances (Private) Ltd | Manufacturing | 2025 |
| BXA Wedding Services Ltd | Hospitality | 2023 |
| BXM Construction Ltd | Construction | 2023 |
| Bxndle Ltd | Wholesale & retail | 2025 |
| BY Imaan Limited | Manufacturing | 2023 |
| BY Jake Hall Ltd | Wholesale & retail | 2023 |
| BY Mariya Ltd | Wholesale & retail | 2026 |
| BY My Investments Limited | Real estate | 2007 |
| BY My Properties Limited | Extraterritorial | 2007 |
| BY Naked Limited | Other services | 2018 |
| BY Réky Limited | Wholesale & retail | 2024 |
| BYA Properties London Ltd | Real estate | 2026 |
| Byars Ltd | Other services | 2019 |
| Bycap Limited | Real estate | 2018 |
| Bycity Global Limited | Wholesale & retail | 2016 |
| BYG Transport Ltd | Transport & logistics | 2023 |
| BYM Services Essex Ltd | Transport & logistics | 2022 |
| Bymuna Ltd | Wholesale & retail | 2025 |
| Byond Media Ltd | Other services | 2023 |
| Byron Homes 1 Ltd | Real estate | 2024 |
| Byron Homes Ltd | Real estate | 2015 |
| Bysabina.K Limited | Wholesale & retail | 2024 |
| Byside Ltd | Wholesale & retail | 2025 |
| Bysonsolutions Ltd | Wholesale & retail | 2024 |
| Bysvltana Ltd | Other services | 2024 |
| Byte Enterprise Ltd | Wholesale & retail | 2020 |
| Byte Flux Infinite Ltd | Wholesale & retail | 2025 |
| Bytecore Digital Limited | Information & communication | 2026 |
| Byway Homes Limited | Real estate | 2017 |
| BZL Limited | Transport & logistics | 2025 |
| Bêtes Sauvages Ltd | Information & communication | 2018 |
| C & B Fastservice Ltd | Construction | 2015 |
| C & G Constructionltd Limited | Construction | 2007 |
| C & H Ductwork Limited | Construction | 2008 |
| C & J Trading (UK) Limited | Real estate | 2004 |
| C & M Higgins Services Limited | Construction | 2011 |
| C & M Maintenance Limited | Construction | 2016 |
| C & M Total Landscapes Limited | Administrative & support | 2015 |
| C & S Digital Limited | Manufacturing | 2000 |
| C & S Digital Print Limited | Manufacturing | 2025 |
| C & Z Perfect Services Ltd | Professional & scientific | 2010 |
| C & Z Portfolio Ltd | Construction | 2023 |
| C Diimon Construction Ltd | Construction | 2023 |
| C I B Logistic Transport Ltd | Transport & logistics | 2020 |
| C I I Design Limited | Wholesale & retail | 2009 |
| C I Stefan Limited | Construction | 2014 |
| C J Bass Builders Limited | Construction | 1997 |
| C L Building Ltd | Construction | 2024 |
| C Papoutsos Limited | Health & social care | 2022 |
| C Parkinson & Sons Traffic Management Ltd | Transport & logistics | 2019 |
| C PAS Logistics Ltd | Transport & logistics | 2017 |
| C R L Contracts Limited | Construction | 2005 |
| C S Consultancy Ltd | Information & communication | 2022 |
| C S M London Scaffolding Ltd | Construction | 2013 |