| Broadway Taste Ltd | Hospitality | 2020 |
| Brockmere Management Ltd | Households | 2021 |
| Bromberg Properties Ltd | Construction | 2021 |
| Bronze Restorations Consultancy Ltd | Manufacturing | 2015 |
| Brookfield Aviation Finance Limited | Administrative & support | 2015 |
| Brookfield Aviation International (A.M.E.) Ltd. | Administrative & support | 2016 |
| Brookfield Aviation International (Europe) Ltd | Transport & logistics | 2021 |
| Brookfield Aviation International (FAR East) Ltd | Professional & scientific | 2015 |
| Brookfield Education and Training Limited | Education | 2015 |
| Brooks Gardening Limited | Construction | 2017 |
| Broom Hall (Oxshott) Residents' Association Limited | Households | 1964 |
| Brooxwell Ltd | Construction | 2026 |
| Brother Strut Limited | Arts & recreation | 2013 |
| Brown Lock Partnership Limited | Construction | 2011 |
| Brownborne Management Company Limited | Households | 1964 |
| Brownes Tanning Limited | Other services | 2026 |
| BRP Contractors Ltd | Construction | 2022 |
| BRP Services Limited | Professional & scientific | 2018 |
| Bruce Macgregor Ministries Ltd | Information & communication | 2024 |
| Bruce the Shark Limited | Households | 2020 |
| Brush & Beyond Ltd | Construction | 2023 |
| Brush Labs Limited | Information & communication | 2024 |
| Bryant Education Pathways Limited | Education | 2026 |
| BS AS Ashford Ltd | Hospitality | 2019 |
| Bs.As. Maidstone Ltd | Hospitality | 2008 |
| BS2A Ltd | Real estate | 2023 |
| BSC Guildford Ltd | Hospitality | 2003 |
| BSD Electrical Services Limited | Construction | 2019 |
| BSI Merch Limited | Wholesale & retail | 2012 |
| BST Construction Limited | Construction | 2007 |
| BT Couriers Limited | Transport & logistics | 2012 |
| BTB Trading Services Ltd | Transport & logistics | 2018 |
| Btech Support Ltd | Information & communication | 2014 |
| Bubble Experts West Kilburn Ltd | Hospitality | 2022 |
| Bubble Tea by Paya Ltd | Hospitality | 2026 |
| Bubbleloop Limited | Hospitality | 2021 |
| Buckingham Court (Wimbledon) Limited | Real estate | 1979 |
| Buckle Building Services Ltd | Construction | 2023 |
| Buddy and Bailey Limited | Wholesale & retail | 2021 |
| Buddy Ltd | Administrative & support | 2013 |
| Budiam Consulting Limited | Financial services | 2017 |
| BUG Group Limited | Manufacturing | 2023 |
| BUG Guru Limited | Information & communication | 2025 |
| Buggy Valet Ltd | Administrative & support | 2024 |
| Bugrawe Ltd | Wholesale & retail | 2025 |
| Build Digital Freedom Ltd | Administrative & support | 2022 |
| Build Joy Limited | Construction | 2019 |
| Build One (London) Ltd | Construction | 2022 |
| Buildex PM Ltd | Professional & scientific | 2026 |
| Buildex Pro Limited | Construction | 2024 |
| Building Shop Limited | Wholesale & retail | 1999 |
| Building Werks Ltd | Construction | 2021 |
| Built Beyond Typical Ltd | Other services | 2026 |
| Bulkycart Ltd | Wholesale & retail | 2025 |
| Bully Rigging and Scenic Services Ltd | Construction | 2023 |
| Bultech Consulting Ltd | Construction | 2023 |
| Bundred Software Ltd | Information & communication | 2014 |
| Bunk and Breakfast Limited | Hospitality | 2017 |
| Burgah Ltd | Wholesale & retail | 2026 |
| Burgh Heath Road Management Co. Limited | Households | 1991 |
| Burlington Court (Eastbourne) Limited | Households | 1992 |
| Burn Productions Limited | Information & communication | 2014 |
| Burnell Investment Advisory Limited | Real estate | 2023 |
| Burnt Clay Builders Ltd | Construction | 2019 |
| Burroughs Adventure Limited | Arts & recreation | 2024 |
| Burton & Smith (UK) Limited | Professional & scientific | 1994 |
| Burton Lodge (Wimbledon) Residents Association Limited | Households | 1986 |
| Burwood (UK) Limited | Extraterritorial | 2006 |
| Bury House Properties Limited | Real estate | 2001 |
| Business BAZ Holdings Ltd | Real estate | 2023 |
| Business Motivation Seminars (Holdings) Limited | Professional & scientific | 2002 |
| Business Motivation Seminars Limited | Education | 1983 |
| Business Solutions for Companies Ltd | Professional & scientific | 2021 |
| Buxlulu Limited | Professional & scientific | 2023 |
| Buxton Apartments Limited | Households | 2006 |
| Bwn-Stx Ltd | Manufacturing | 2025 |
| BWS Partnership Limited | Professional & scientific | 2000 |
| Bwtlaw LLP | | 2009 |
| BX Consulting Services Ltd | Professional & scientific | 2022 |
| BY Melissa Design Ltd | Professional & scientific | 2016 |
| Byds+Associates Limited | Professional & scientific | 2016 |
| Byng House Management Limited | Other services | 1981 |
| Byways Boxhill Limited | Construction | 2021 |
| Bz&Et Ltd | Wholesale & retail | 2025 |
| C & P Thai Cuisine & Cafe Limited | Hospitality | 2024 |
| C & R Accountants Ltd | Professional & scientific | 2024 |
| C Bull Swimming Saturday Limited | Arts & recreation | 2022 |
| C EX C Limited | Extraterritorial | 1997 |
| C I Corporate Security Limited | Administrative & support | 2012 |
| C J Blakeley Services Limited | Health & social care | 2014 |
| C N Westerton Limited | Information & communication | 2020 |
| C R Surveying Ltd | Professional & scientific | 2016 |
| C&C Property Hub Ltd | Real estate | 2024 |
| C&Cw Ltd | Construction | 2023 |
| C'Couture Limited | Other services | 2024 |
| C. Pulze Consultancy Limited | Administrative & support | 1997 |
| C.Biz-Online Ltd | Wholesale & retail | 2025 |
| C.Davies Film Production Limited | Information & communication | 2024 |
| C.I.L Hope Holdings Ltd | Financial services | 2025 |
| C2 IT Asset Disposal Limited | Wholesale & retail | 2017 |