| Baatpakki Limited | Hospitality | 2024 |
| Backup Administration Ltd | Administrative & support | 2022 |
| Backyard Barbers Ltd | Other services | 2019 |
| Bajjem Ltd | Wholesale & retail | 2024 |
| Barabbas Ltd | Real estate | 2026 |
| Bark and Bubbles Dog Grooming Ltd. | Administrative & support | 2019 |
| Barna Close Limited | Households | 2022 |
| Barry Godfrey Limited | Manufacturing | 2012 |
| Barusa Ltd | Real estate | 2025 |
| Baseline Equipment Ltd | Wholesale & retail | 2025 |
| Battleflag Militaria Ltd | Wholesale & retail | 2015 |
| Bauk Design & Build Ltd | Construction | 2019 |
| BE Inspired Youth & Community C.I.C. | Other services | 2017 |
| BE Normal Ltd | Professional & scientific | 2015 |
| BE the Ladder Limited | Education | 2025 |
| Beasty Jacks Ltd | Manufacturing | 2016 |
| Becoming Group Limited | Professional & scientific | 2023 |
| Beeson Forse Fine Wine Ltd | Wholesale & retail | 2021 |
| Being Human in Healthcare Ltd | Education | 2017 |
| Bella Home Interiors Ltd | Manufacturing | 2020 |
| Belle Research Limited | Professional & scientific | 2013 |
| Belle Rose Group Limited | Hospitality | 2024 |
| Bellenger Consulting Ltd | Professional & scientific | 2025 |
| Belong:In Training and Development Ltd | Education | 2022 |
| Bennett & Cole Company Limited | Administrative & support | 2025 |
| Bespin Windows Ltd | Wholesale & retail | 2026 |
| Bespoke Windows/Doors Ltd | Construction | 2019 |
| Best Kitchen & Burger Ltd | Hospitality | 2023 |
| Bestboss Ltd | Wholesale & retail | 2024 |
| Besteam UK Ltd | Wholesale & retail | 2018 |
| Beta Tech UK Limited | Information & communication | 2007 |
| Beth Shakespeare Speech & Language Therapy Limited | Health & social care | 2016 |
| Beulah Support Services Ltd | Administrative & support | 2025 |
| Bham Properties Limited | Real estate | 2017 |
| Bhule Health Limited | Health & social care | 2014 |
| BIA by DB Ltd | Health & social care | 2024 |
| Bichso Compliance Services Limited | Professional & scientific | 2020 |
| Big Dog Technology Ltd | Other services | 2024 |
| Biome Health Ltd | Wholesale & retail | 2024 |
| Birdhouse Staging Limited | Professional & scientific | 2020 |
| Bison Finch Ltd | Other services | 2025 |
| Bitetech Infrastructure Ltd | Financial services | 2026 |
| Bizz Group Ltd | Information & communication | 2016 |
| Bizzconnect Ltd | Information & communication | 2020 |
| Black Fish Software Limited | Information & communication | 2008 |
| Blackwing Holdings Ltd | Information & communication | 2021 |
| Blakeaccounting Ltd | Professional & scientific | 2020 |
| Blanchmans Road Limited | Administrative & support | 2008 |
| Bliss Desserts Ltd | Wholesale & retail | 2021 |
| Block Narrative Ltd | Professional & scientific | 2024 |
| Blossom Medical Services Ltd | Health & social care | 2013 |
| Blue Globe Consulting Ltd | Construction | 2019 |
| Blue Hedge Limited | Wholesale & retail | 2024 |
| Blue Leaves Accounting Ltd | Professional & scientific | 2014 |
| Bluefish IT Consulting Limited | Information & communication | 2015 |
| Bluestone Cooperation Limited | Real estate | 2020 |
| Bluetooth Productions Limited | Administrative & support | 2023 |
| BOA & Sons Ltd. | Construction | 2016 |
| Bodhi Consulting Limited | Professional & scientific | 2015 |
| Bombaylicious Limited | Hospitality | 2019 |
| Bond & Haynes Limited | Administrative & support | 1997 |
| Bond & Sherwill Limited | Real estate | 2015 |
| Botanical Blooms Florist Limited | Wholesale & retail | 2022 |
| Brag Contractors Ltd | Construction | 2026 |
| Branch Business Services Ltd | Professional & scientific | 2019 |
| Brandheart Ltd | Professional & scientific | 2025 |
| Breathe Garden Design Ltd | Construction | 2009 |
| Brick Realty Ltd | Real estate | 2022 |
| Bright Light Care Group Ltd | Health & social care | 2025 |
| Bright Path Homes Limited | Health & social care | 2025 |
| Brighton Pharmacy Ltd | Health & social care | 2025 |
| Britchance Limited | Professional & scientific | 2012 |
| Britquartz Ltd | Manufacturing | 2025 |
| Broad and Garden Walk Limited | Households | 2021 |
| Brock & Sons Construction Ltd | Construction | 2022 |
| Brookborough Building Solutions Ltd | Construction | 2024 |
| Brookhill Limited | Construction | 2021 |
| Browne Property Improvements Ltd | Construction | 2026 |
| Bruno Property Limited | Financial services | 2025 |
| Brymec Ltd | Wholesale & retail | 2013 |
| Bryson Group Holdings Limited | Financial services | 2026 |
| Bryson Products (Holdings) Limited | Professional & scientific | 2014 |
| Bryson Products Limited | Wholesale & retail | 2011 |
| Bucca Solutions Ltd | Professional & scientific | 2025 |
| Buckhurst Investments Limited | Manufacturing | 1966 |
| Buffy Properties Limited | Households | 2018 |
| Bull & Bear Enterprises Limited | Financial services | 2012 |
| Burgershak Investment Limited | Hospitality | 2019 |
| Burrett Consulting Limited | Administrative & support | 2016 |
| Business Connection (UK) Limited | Professional & scientific | 2007 |
| Butler Associates Limited | Professional & scientific | 1992 |
| Butterflies Toddles & Nature Pre-School Club Ltd | Education | 2026 |
| Buzz & Grill Limited | Hospitality | 2025 |
| C & J Installations Limited | Construction | 2012 |
| C & R Newsagents | Real estate | 1961 |
| C J Conner Limited | Administrative & support | 2026 |
| C J Enviro Design Atelier Ltd | Professional & scientific | 2011 |
| C Priestly & Associates Limited | Professional & scientific | 2025 |
| C Z Construction Surrey Limited | Other services | 2018 |
| C&G North Road Limited | Real estate | 2022 |