| Bellau Company Limited | Real estate | 1952 |
| Beller Ltd | Real estate | 2023 |
| Belverde Limited | Hospitality | 2013 |
| Benrach Ltd | Professional & scientific | 2008 |
| Bentley Morgan Property Solutions Ltd | Construction | 2022 |
| Berrie Services Ltd | Administrative & support | 2020 |
| Berwick Shooting Ground Ltd | Arts & recreation | 2022 |
| Bespoke 3D Ltd | Real estate | 2013 |
| Bespoke Vista Ltd | Information & communication | 2015 |
| Best Mailing Ltd | Wholesale & retail | 2025 |
| Best Mugs and T- Shirts Ltd | Manufacturing | 2017 |
| BET 21 Limited | Arts & recreation | 2014 |
| Betting Shop Operations Limited | Arts & recreation | 2005 |
| Betting Shop Services Limited | Arts & recreation | 2004 |
| Between Consulting Ltd | Professional & scientific | 2026 |
| Bgcis Limited | Professional & scientific | 2017 |
| BHS Joinery Works Limited | Manufacturing | 2023 |
| Big Blue Electrical Ltd | Construction | 2016 |
| Bikermedics Ltd | Transport & logistics | 2015 |
| Birch 1969 Limited | Extraterritorial | 2013 |
| Bizz-Buildz Limited | Manufacturing | 2024 |
| Bizz-Pods Limited | Construction | 2023 |
| BJ Gold Jewellery Limited | Wholesale & retail | 2023 |
| BKI Group Ltd | Construction | 2022 |
| Blakespar Ltd | Hospitality | 2011 |
| Blitzdrop Ltd | Wholesale & retail | 2025 |
| Blox Architects Ltd | Professional & scientific | 2017 |
| BLU Contracts Ltd | Construction | 2024 |
| BLU Interpreter Ltd | Professional & scientific | 2024 |
| Bluecrystalglass Limited | Manufacturing | 2019 |
| BMC Contracts Ltd | Construction | 2018 |
| Bmti Ltd. | Health & social care | 2014 |
| Boat Club Events LLP | | 2021 |
| Bobo Viet Limited | Hospitality | 2024 |
| Body & Soul United Limited | Information & communication | 2015 |
| Bold Contractors Limited | Construction | 2017 |
| Boost and Glow Ltd | Health & social care | 2026 |
| Bootleg & Smuggler Limited | Wholesale & retail | 2003 |
| Boundary Court Management (Epping) Limited | Households | 2009 |
| BOW Maintenance & Landscaping Limited | Administrative & support | 2002 |
| Bower Court Residents Association Limited | Households | 1981 |
| Boxing Equipment Ltd | Wholesale & retail | 2024 |
| Boyten Consultancy Limited | Administrative & support | 2004 |
| BPJ Management Ltd | Financial services | 2015 |
| BR Lets & Developments Ltd | Real estate | 2025 |
| BR Prop Ltd | Real estate | 2021 |
| BR Search Ltd | Administrative & support | 2018 |
| Brad's Backpack Ltd | Information & communication | 2023 |
| Bradshaw Plumbing & Heating Ltd | Construction | 2016 |
| Bramfield Automotive Limited | Wholesale & retail | 2018 |
| Bread With Bites Ltd | Hospitality | 2016 |
| Brexit Import and Export Company Limited | Wholesale & retail | 2018 |
| Brick Lane Bagels Theydon Ltd | Hospitality | 2025 |
| Bricknell Building Limited | Construction | 2016 |
| Bridge Comms Limited | Information & communication | 2016 |
| Bridges Electrical Limited | Construction | 1998 |
| Bright Orange Supplies Limited | Wholesale & retail | 2014 |
| British Essentials Limited | Wholesale & retail | 2025 |
| Broken Angel Books Limited | Information & communication | 2022 |
| Broken Shader Software Limited | Information & communication | 2024 |
| Brothers Car Sales Ltd | Wholesale & retail | 2025 |
| Brothers Car Wash Ltd | Administrative & support | 2026 |
| Browline Bureau Services Ltd | Professional & scientific | 2019 |
| Browline Consulting Ltd | Information & communication | 2001 |
| BRU Global Limited | Wholesale & retail | 2019 |
| Brundells Shopfitters Limited | Real estate | 1960 |
| Buckle UP Entertainment Ltd | Information & communication | 2020 |
| Build Estates Ltd | Construction | 2019 |
| Bumerang Ltd | Wholesale & retail | 2020 |
| Bure Bakehouse Ltd | Hospitality | 2025 |
| Burlington Contractors Ltd | Construction | 2026 |
| Burlington Property Development Ltd | Construction | 2026 |
| Burlington Property Maintenance Ltd | Administrative & support | 2026 |
| Burton-Rose Developments Ltd | Water & waste | 2019 |
| Bury Property Investments Ltd | Real estate | 2017 |
| Business Behaviour Limited | Professional & scientific | 2007 |
| Butler Estates Limited | Real estate | 1979 |
| Butler Solent Limited | Other services | 1993 |
| Buxton Playing Fields Limited | Professional & scientific | 2018 |
| Buzzard Properties UK Ltd | Real estate | 2015 |
| C MAC Construction Limited | Construction | 2006 |
| CAD Smiths 2 Limited | Professional & scientific | 2019 |
| Caelator Limited | Wholesale & retail | 2012 |
| Callerz Futures Ltd | Financial services | 2026 |
| Cambridge Court (Frinton) Maintenance Company | Real estate | 1968 |
| Cameron Management Services Limited | Real estate | 1992 |
| Cameron Securities Limited | Real estate | 2001 |
| Camfaud Group Limited | Financial services | 2016 |
| Canditfa Ltd | Education | 2015 |
| Capadocia Court Limited | Real estate | 2006 |
| Cape Consultants Limited | Information & communication | 2017 |
| Capital Children's Care Holdings Ltd | Real estate | 2019 |
| Capital Children's Care Ltd | Health & social care | 2018 |
| Capital Cleaning Maintenance Services Ltd | Administrative & support | 2016 |
| Capital Group Properties Ltd | Real estate | 2020 |
| Capital Pulse Limited | Financial services | 2023 |
| Car Locker Ltd | Wholesale & retail | 2024 |
| Car Station Ltd. | Wholesale & retail | 2018 |
| Car Station Services Ltd | Wholesale & retail | 2022 |
| CARAVAN6 Ltd. | Other services | 2009 |