| Beans and Blooms Ltd | Agriculture & fishing | 2019 |
| Beaola Limited | Administrative & support | 2017 |
| Beaola Property Limited | Real estate | 2021 |
| Beardwell DE Lacey Holdings Limited | Financial services | 2024 |
| Beardwell DE Lacey Limited | Professional & scientific | 2023 |
| Beat the Meat Ltd | Manufacturing | 2020 |
| Beat the Quote Car Hire Limited | Administrative & support | 2025 |
| Beatsoul Limited | Administrative & support | 2019 |
| Beattie Railway Services Limited | Construction | 2015 |
| Beauty Industry Magazine Ltd | Information & communication | 2023 |
| Bebe Auto Ltd | Transport & logistics | 2017 |
| Bebedrops Ltd | Wholesale & retail | 2022 |
| Bebi Ltd | Manufacturing | 2018 |
| Bebosi Construction Ltd | Real estate | 2020 |
| Beckenham Storage Ltd | Real estate | 1997 |
| Bedrock Assets Ltd | Financial services | 2026 |
| Befatake Limited | Health & social care | 2023 |
| Being -There Counselling Services Limited | Health & social care | 2017 |
| Beka Building Services Ltd | Construction | 2019 |
| Bela Group of Companies Limited | Other services | 2003 |
| Bell Rain Screen Cladding Ltd | Construction | 2019 |
| Bella Beans Events Limited | Wholesale & retail | 2024 |
| Bella Ciao Bar Ltd | Hospitality | 2026 |
| Bellavue Limited | Information & communication | 2025 |
| Belle Motors Ltd | Wholesale & retail | 2019 |
| Belmont Castle Academy | Education | 2012 |
| Belmont Childcare Ltd | Education | 2012 |
| Belmont Ridgway Limited | Professional & scientific | 2025 |
| Belowground Holdings Ltd | Construction | 2019 |
| BEN Boosey Limited | Construction | 2025 |
| Benas Resourses Limited | Administrative & support | 2019 |
| Bendrian Ltd | Wholesale & retail | 2021 |
| Benson Advertising Limited | Professional & scientific | 2018 |
| Berat Musa Ltd | Hospitality | 2021 |
| Berbytrans Ltd | Transport & logistics | 2025 |
| Berevitalise (BRV) CIC | Hospitality | 2024 |
| Berkeley Springs Limited | Manufacturing | 2015 |
| Bert's Bits and Bobs Ltd | Wholesale & retail | 2023 |
| Bertea Construction Ltd | Construction | 2023 |
| Bespoke Proposal Ltd | Wholesale & retail | 2016 |
| Best 4X4 Ltd | Wholesale & retail | 2022 |
| Best Auto Traders Ltd | Wholesale & retail | 2026 |
| Best British Centre | Professional & scientific | 2011 |
| Best Highway Services Limited | Construction | 2016 |
| Best Morocco Tour Packages Ltd | Wholesale & retail | 2025 |
| Best of the Best Global Ltd | Education | 2026 |
| Best Property Maintenance Ltd | Real estate | 2019 |
| Best With Quality Limited | Wholesale & retail | 2012 |
| Betelbee Ltd | Wholesale & retail | 2025 |
| Bethany Relief and Rehabilitation International (UK) | Health & social care | 2011 |
| Bethel Rock Ltd | Hospitality | 2017 |
| Better by Miles Limited | Other services | 2019 |
| Better Supported Living Ltd | Health & social care | 2026 |
| Betts Consultancy Services Ltd | Other services | 2021 |
| Betty UK Limited | Manufacturing | 2023 |
| Beulah Corporation Ltd. | Administrative & support | 2012 |
| Beuty Zone Aesthetics Limited | Manufacturing | 2024 |
| Bevalez Limited | Wholesale & retail | 2024 |
| Bewicke Main Limited | Hospitality | 2020 |
| Beyond Limits Coach Limited | Arts & recreation | 2015 |
| Beyond the Hustle Ltd | Other services | 2026 |
| Beyourdog Limited | Information & communication | 2025 |
| Bfound Limited | Other services | 2005 |
| BFR Carpentry Ltd | Construction | 2020 |
| Bfttt Resources Inc Ltd. | Information & communication | 2016 |
| BGH 1 Ltd | Wholesale & retail | 2024 |
| Bgseba Ltd | Public administration | 2021 |
| Bhagwati Limited | Health & social care | 2013 |
| Bhatt 09 Limited | Other services | 2018 |
| Bhimsingh Limited | Information & communication | 2013 |
| Bhisco Ltd | Construction | 2024 |
| BHL Homes Limited | Real estate | 2021 |
| Bhoom Developments Ltd | Real estate | 2024 |
| Bica Trans Ltd | Transport & logistics | 2023 |
| Big Buy Ltd | Wholesale & retail | 2023 |
| Big Dog Productions (Essex) Ltd | Information & communication | 2023 |
| Big Fish Academy Limited | Education | 2025 |
| Big TOM Transport Ltd | Transport & logistics | 2025 |
| Billericay Taxis Ltd | Transport & logistics | 2014 |
| Billypix Limited | Information & communication | 2006 |
| Bim's Delight Ltd | Manufacturing | 2018 |
| Binder Bros UK Ltd | Wholesale & retail | 2026 |
| Binggo B&C Ltd | Construction | 2020 |
| Bingo CDS Limited | Transport & logistics | 2015 |
| Binoj Critical Care Ltd | Health & social care | 2023 |
| Binos Services Ltd | Health & social care | 2019 |
| BIO JMT Limited | Wholesale & retail | 2024 |
| Bio-Green Exports Limited | Extraterritorial | 2004 |
| Biosure Global Ltd | Manufacturing | 2018 |
| Biovita Ltd | Wholesale & retail | 2024 |
| Biramila Ltd | Real estate | 2023 |
| Birchwood House Ltd | Construction | 2026 |
| Birdies Cafe Ltd | Hospitality | 2025 |
| Birdie’S Catering Limited | Hospitality | 2023 |
| Birding Tours Ltd | Wholesale & retail | 2020 |
| Birds EYE Security Services Ltd | Administrative & support | 2015 |
| Birdseye Supported Employment CIC | Administrative & support | 2025 |
| Birk Video Productions Ltd. | Information & communication | 2004 |
| Birkin Cleaning Services Limited | Administrative & support | 1972 |
| Birkin Group Limited | Administrative & support | 2007 |