| Barker Homes Maidenhead Ltd | Construction | 2022 |
| Barker Homes Oaklands Ltd | Construction | 2019 |
| Barker Homes Wheatsheaf Limited | Construction | 2019 |
| Barnham Powertrain Design Limited | Professional & scientific | 2021 |
| Barnwell Footwear Limited | Manufacturing | 2021 |
| Baron Housing Limited | Real estate | 2023 |
| Barr Wealth Management Limited | Professional & scientific | 2018 |
| Barrow in Furness Properties Limited | Real estate | 2017 |
| Barry Haulage Limited | Transport & logistics | 2010 |
| Bartholomew Trading Limited | Extraterritorial | 2018 |
| Barton Communications Limited | Administrative & support | 2004 |
| Barton Construction (Kettering) Limited | Extraterritorial | 1982 |
| Barton Contracting Limited | Construction | 1969 |
| Barton Craft Blanks Ltd | Wholesale & retail | 2024 |
| Barton Lodge Developments Limited | Construction | 2016 |
| Barton Plant Limited | Administrative & support | 2021 |
| Basewellness Limited | Other services | 2025 |
| Basf Installations Limited | Construction | 2024 |
| Basra Trucks Limited | Transport & logistics | 2018 |
| Bath Road Mews (Kettering) Management Company Limited | Households | 2006 |
| Bathroom Design & Install Ltd. | Construction | 2021 |
| Battle Arena MMA Ltd | Information & communication | 2022 |
| Baulogic Holdings Ltd | Manufacturing | 2019 |
| Bavaro's Beauty Ltd | Other services | 2023 |
| Bavaro’S Hair Design Ltd | Other services | 2022 |
| Bavent Road (London) RTM Company Limited | Households | 2004 |
| Baxe Transport Ltd | Transport & logistics | 2025 |
| Baxter Hill Investments Limited | Real estate | 2017 |
| Bayard Capital (UK) Limited | Financial services | 2013 |
| Bayman Ltd | Real estate | 2020 |
| Bazaas Limited | Real estate | 2014 |
| BB Apartments Ltd | Real estate | 2023 |
| BB Building Contractors Ltd | Construction | 2019 |
| BBM Properties Ltd | Hospitality | 2026 |
| BBY Beauty Studio Ltd | Other services | 2025 |
| BCC Connect Ltd | Administrative & support | 2025 |
| BCF Consultants Ltd | Other services | 2025 |
| BCJ Consulting Limited | Professional & scientific | 2014 |
| BCN Consultancy Limited | Professional & scientific | 2020 |
| Bdmd Services Ltd | Construction | 2023 |
| BDR Construction Limited | Construction | 2002 |
| Bdug Ltd | Wholesale & retail | 2025 |
| Bdug Services Ltd | Wholesale & retail | 2026 |
| BE Care With Compassion Ltd | Health & social care | 2019 |
| Beach Consulting Limited | Professional & scientific | 2021 |
| Beachvalley Limited | Information & communication | 2012 |
| Bead Transport Options Ltd | Transport & logistics | 2011 |
| Beads by Geeg Limited | Manufacturing | 2021 |
| Beagle Editions Limited | Arts & recreation | 1995 |
| Beamhouse Tannery Services Ltd | Wholesale & retail | 2017 |
| Bean Hive Properties Limited | Real estate | 2021 |
| Beanfly Ltd | Health & social care | 2023 |
| Bear Materials Limited | Transport & logistics | 2020 |
| Bear Valley Timber Ltd | Agriculture & fishing | 2018 |
| Bearpaw Services Limited | Other services | 2020 |
| Bearsec Services Ltd | Administrative & support | 2024 |
| Beating Wings Ltd | Arts & recreation | 2017 |
| Beaudy Consulting Limited | Professional & scientific | 2016 |
| Beaudy Healthcare Consulting Ltd | Health & social care | 2024 |
| Beaulieu Gdns Ltd | Real estate | 2024 |
| Beauty Bar (Kettering) Ltd | Other services | 2012 |
| Beauty Bar Desborough Ltd | Other services | 2019 |
| Beauty Cataleya Limited | Other services | 2024 |
| Beauty Hair Styles Saloon (Bhss) Limited | Other services | 2020 |
| Beccy Hurrell Voice & Arts Limited | Education | 2021 |
| Beco Dreadlocks Limited | Other services | 2024 |
| Bede Close Rental Limited | Real estate | 2026 |
| Bedrock Investments DB Ltd | Financial services | 2022 |
| BEE Consultancy Ltd | Professional & scientific | 2003 |
| BEE Payroll Ltd | Professional & scientific | 2019 |
| Beebeautyhairsalon Ltd | Other services | 2022 |
| Beeches Farm Limited | Real estate | 1942 |
| Beechwood Studios Limited | Manufacturing | 2017 |
| Beer Festivals UK Limited | Hospitality | 2021 |
| Beitas Group Limited | Wholesale & retail | 2023 |
| Beitas Transport Ltd | Transport & logistics | 2019 |
| BEL EFT Bidco Limited | Administrative & support | 1985 |
| Bel's Enterprise Ltd | Wholesale & retail | 2025 |
| Belfry Finance & Procurement Limited | Professional & scientific | 2026 |
| Bella Barista Holdings Limited | Financial services | 2025 |
| Belleville Property Ltd | Real estate | 2020 |
| Bells Skip Hire Limited | Extraterritorial | 2021 |
| Bells Skips Limited | Extraterritorial | 2021 |
| Bellvue House (Buckingham) Ltd | Real estate | 2025 |
| Belma’S Bakes Limited | Manufacturing | 2021 |
| Belvedere Interiors (Cheshire) Limited | Wholesale & retail | 2018 |
| Belvedere Interiors (DXI) Limited | Wholesale & retail | 2024 |
| Belvedere Interiors (FE) Limited | Wholesale & retail | 2023 |
| Belvedere Interiors (Feii) Limited | Wholesale & retail | 2023 |
| Belvedere Interiors II Ltd | Wholesale & retail | 2024 |
| Bemma Beauty Empire Ltd | Wholesale & retail | 2023 |
| Bemo Project Services Limited | Professional & scientific | 2019 |
| BEN Beaumont Limited | Professional & scientific | 2016 |
| BEN Raftery Limited | Extraterritorial | 2011 |
| Benefield Caravan Storage Park Limited | Other services | 2005 |
| Bengali Spice Limited | Hospitality | 2025 |
| Benima Group Limited | Wholesale & retail | 2025 |
| Benima Logistics Limited | Transport & logistics | 2025 |
| Benion Limited | Extraterritorial | 1971 |
| Benjamin Priest Group Limited | Extraterritorial | 1993 |