| Brunswick House RTM Company Limited | Households | 2013 |
| BRV Solutions Limited | Information & communication | 2024 |
| BRX Technology Ltd | Information & communication | 2023 |
| Bryant Managed Solutions Limited | Professional & scientific | 2014 |
| Bryson Consulting Ltd | Professional & scientific | 2025 |
| BS Systems Kingston Limited | Construction | 2010 |
| BSI Apparel Limited | Manufacturing | 2023 |
| BSL Link for Communication Ltd | Professional & scientific | 2010 |
| BSL Link for Communication Training Ltd | Professional & scientific | 2019 |
| BST Production Ltd | Arts & recreation | 2024 |
| Bubbles Shisha Cafe Ltd | Hospitality | 2019 |
| Buckell & Drew (Management) LLP | | 2018 |
| Buckingham Real Estate Limited | Real estate | 2015 |
| Buckleigh Pharmacy Limited | Wholesale & retail | 1967 |
| Buddlet Ltd | Wholesale & retail | 2020 |
| Build and Service Ltd | Construction | 2024 |
| BUILDEX3000 Limited | Construction | 2024 |
| Building HU Limited | Administrative & support | 2023 |
| Building New Space Ltd | Wholesale & retail | 2016 |
| Bulls Mouth Media Ltd | Professional & scientific | 2014 |
| Burcote Residents' Association Limited | Other services | 1972 |
| Burger Beast Ltd | Hospitality | 2023 |
| Burger Plus London Road Limited | Hospitality | 2019 |
| Burgers Factory Ltd | Hospitality | 2025 |
| Burlington Place (Kings Hill) Management Limited | Households | 2006 |
| Burnad Construction & Consultancy Services Ltd | Professional & scientific | 2017 |
| Burnad Property Ltd | Real estate | 2025 |
| Burning Designs Limited | Administrative & support | 2013 |
| Burrich Group Limited | Construction | 2026 |
| Burritoco Kingston Limited | Hospitality | 2024 |
| Burwood Grange (Walton) NO. 1 Management Limited | Households | 1993 |
| Burwood Grange (Walton) NO. 2 Management Limited | Households | 1993 |
| Burwood Grange (Walton) NO. 3 Management Limited | Households | 1993 |
| Bush Studios Limited | Arts & recreation | 1999 |
| Buster Imaging Limited | Professional & scientific | 2010 |
| Busy Celine Ltd | Other services | 2024 |
| Buta Solutions Ltd | Professional & scientific | 2012 |
| Butlers Management & Consultancy Limited | Real estate | 2016 |
| Butt G Ltd | Wholesale & retail | 2023 |
| Butter Beans Fowey Ltd. | Professional & scientific | 2017 |
| Buttercup Consulting Limited | Professional & scientific | 2015 |
| Butternut Limited | Professional & scientific | 2018 |
| Butterwick Fine Arts Limited | Wholesale & retail | 2019 |
| Button Brand Designs Ltd | Wholesale & retail | 2006 |
| Buy and Build House Ltd | Manufacturing | 2011 |
| Buy South Africa Ltd | Wholesale & retail | 2011 |
| Buy South Africa Properties Limited | Real estate | 2023 |
| Buy South Africa Scot Limited | Wholesale & retail | 2025 |
| Buysmart Products Limited | Administrative & support | 2012 |
| Buzios Holdings Ltd | Financial services | 2023 |
| Buzzing Crystal Ltd | Manufacturing | 2025 |
| BVA Infinite Payment Solutions Ltd | Financial services | 2015 |
| BW Investments Ltd | Real estate | 2019 |
| BXP Ltd | Wholesale & retail | 2023 |
| BY Diono Fitness Ltd | Arts & recreation | 2024 |
| BY Savvy Studios Limited | Arts & recreation | 2026 |
| Byteshuttle Ltd | Information & communication | 2026 |
| C & C Coffee Limited | Hospitality | 2019 |
| C D Installations (UK) Limited | Construction | 2010 |
| C E Grimes Limited | Health & social care | 2022 |
| C J Short Ltd | Administrative & support | 2018 |
| C M Mitchell Accountancy Limited | Professional & scientific | 2017 |
| C P Roldao Limited | Professional & scientific | 2018 |
| C.H.P. (Aranmor House Management) Limited | Households | 1966 |
| C.J.Grinstead Plumbing & Heating Ltd | Construction | 2019 |
| C3J Productions Limited | Professional & scientific | 2022 |
| Cabas and Partners Design Ltd | Professional & scientific | 2019 |
| Cabstop Taxi Rentals 1 Ltd | Transport & logistics | 2012 |
| Cactus Hill Contracts Limited | Professional & scientific | 2001 |
| Cadara.Ai Limited | Information & communication | 2025 |
| Cadence Finance Limited | Financial services | 2012 |
| Cafe Lamour Limited | Hospitality | 2020 |
| Cafe Paulo Ltd | Hospitality | 2019 |
| Cahill Group Limited | Manufacturing | 2023 |
| Cakeco Kingston Ltd | Manufacturing | 2025 |
| Cakewalk London Limited | Hospitality | 2014 |
| Calabash Awnings Limited | Administrative & support | 2010 |
| Calabash Mint Limited | Administrative & support | 2010 |
| Call Coach Limited | Wholesale & retail | 2011 |
| Calluna People Ltd | Administrative & support | 2026 |
| Cambium Services Limited | Information & communication | 2002 |
| Cambridge Barber Ltd | Other services | 2019 |
| Cambridge Health Network Limited | Professional & scientific | 2012 |
| Cambridge Social Impact Consulting Limited | Information & communication | 2024 |
| Camden House Freehold Management Company Limited | Households | 2017 |
| Camden Investments Limited | Professional & scientific | 2000 |
| Camilla Sposa Ltd | Wholesale & retail | 2003 |
| Campden Hill Towers Management Limited | Households | 1982 |
| Campley Holdings Ltd | Wholesale & retail | 2023 |
| Can-Do Capital Limited | Financial services | 2023 |
| Canaan House Limited | Real estate | 2024 |
| Canbury Boathouse Limited(The) | Arts & recreation | 1964 |
| Canbury Consulting Limited | Professional & scientific | 2015 |
| Canbury Homes Hill House Ltd | Real estate | 2020 |
| Canbury Homes Holdings Ltd | Real estate | 2020 |
| Canbury Homes Land Ltd | Construction | 2023 |
| Canbury Homes Ltd | Construction | 2011 |
| Canbury House Limited | Households | 2021 |
| Canbury Ltd | Wholesale & retail | 2011 |
| Canbury Place Management Company (NO.1) Limited | Households | 1997 |