| Buzz Energy Limited | Professional & scientific | 2014 |
| Buzzard Property Developments Partnership | | 2003 |
| Buzzboost Group Ltd | Professional & scientific | 2024 |
| Buzzhaus Collective Ltd | Information & communication | 2026 |
| BVD Limited | Transport & logistics | 2019 |
| Bvla Limited | Households | 2025 |
| BVM Property Group Ltd | Real estate | 2025 |
| BW ANP Services Ltd | Health & social care | 2023 |
| BW Brickwork Developments Ltd | Construction | 2024 |
| BW Emsley Livestock Limited | Construction | 2014 |
| BW Legal Services Limited | Professional & scientific | 2012 |
| BW QS Services Limited | Professional & scientific | 2025 |
| BW Skip Hire Limited | Water & waste | 1996 |
| BWC Sales Limited | Wholesale & retail | 2025 |
| BWD Search & Selection Limited | Administrative & support | 2006 |
| BWH Sports Limited | Administrative & support | 2026 |
| BWL Ltd | Construction | 2015 |
| BWM PCN Limited | Health & social care | 2022 |
| Bwntd Limited | Professional & scientific | 2023 |
| Bwpm Holdings Ltd | Financial services | 2024 |
| BWS Property Leeds Limited | Households | 2017 |
| Bwwp Limited | Administrative & support | 2021 |
| BY Advanced Limited | Construction | 2023 |
| BY Alicia Ltd | Other services | 2024 |
| BY Aurora UK Ltd | Wholesale & retail | 1998 |
| BY Diffusion Ltd | Professional & scientific | 2022 |
| BY Elliegreen Ltd | Professional & scientific | 2024 |
| BY Eterninho Ltd | Wholesale & retail | 2025 |
| BY Maryam Ltd | Wholesale & retail | 2024 |
| BY Name. by Nature. Limited | Wholesale & retail | 2021 |
| BY the Design Team Ltd | Professional & scientific | 2018 |
| By-Pass Filtration Limited | Manufacturing | 1990 |
| BYC Realty Ltd | Real estate | 2024 |
| Bychef Ltd | Hospitality | 2026 |
| BYE BYE BED Ltd | Manufacturing | 2019 |
| Byefly Ltd | Wholesale & retail | 2025 |
| Byford Eyecare Limited | Health & social care | 2017 |
| Bygone Classics Limited | Administrative & support | 2022 |
| BYK Limited | Hospitality | 1999 |
| Bykberg Limited | Information & communication | 2017 |
| Byline Content Ltd | Information & communication | 2025 |
| Bymolly Ltd | Hospitality | 2021 |
| Byram Park Developments Limited | Real estate | 2026 |
| Byram Stores Ltd | Wholesale & retail | 2015 |
| Byron Leak Property Holdings Ltd | Real estate | 2025 |
| Byron Walk Management Company Limited | Households | 1969 |
| Bytecliff Ltd | Information & communication | 2025 |
| Bytesoft Ltd | Information & communication | 2020 |
| Bywater Kent Support Services Ltd | Administrative & support | 2023 |
| Bywater Motor Group Ltd | Wholesale & retail | 2018 |
| Bywell Transport Limited | Transport & logistics | 2024 |
| BZ TEK Limited | Professional & scientific | 2018 |
| Bzar E-Commerce Limited | Wholesale & retail | 2003 |
| Bzquick International Limited | Information & communication | 2022 |
| BZW Consulting Limited | Administrative & support | 2011 |
| B’Luxe Nails Academy Ltd | Education | 2020 |
| C & a Developments Limited | Real estate | 2020 |
| C & a Garage Limited | Wholesale & retail | 2025 |
| C & a J Marshall Aggregates Limited | Construction | 2021 |
| C & a J Marshall Builders Limited | Construction | 2002 |
| C & a Roofing Contractors Ltd | Construction | 2025 |
| C & AJ Marshall Holdings Limited | Construction | 2021 |
| C & C Electrical Gildersome Ltd. | Construction | 2008 |
| C & C Golfscapes Ltd | Administrative & support | 2014 |
| C & D (Leeds) Holdings Limited | Financial services | 2017 |
| C & D (Leeds) Plumbers Merchants Limited | Wholesale & retail | 2007 |
| C & D Marsland Sheet Metal Limited | Construction | 2005 |
| C & D Streetworks Limited | Administrative & support | 2013 |
| C & F Direct Leeds Ltd | Wholesale & retail | 2020 |
| C & G Properties (Yorkshire) Limited | Real estate | 2018 |
| C & G Salmon Tiling and Building Maintenance Ltd | Construction | 2026 |
| C & G Sewing Machines Limited | Wholesale & retail | 2000 |
| C & G Tankers Ltd | Wholesale & retail | 2026 |
| C & H Stephenson Ltd | Agriculture & fishing | 2026 |
| C & I Threading Ltd | Manufacturing | 2019 |
| C & L Clearance Services Ltd | Transport & logistics | 2026 |
| C & M Johnson Developments Limited | Real estate | 2003 |
| C & M Property Services Limited | Real estate | 2006 |
| C & N Clarkson Holdings Ltd | Financial services | 2025 |
| C & O Transformations Ltd | Construction | 2023 |
| C & R Stevens Estates Limited | Real estate | 2014 |
| C & T Property Holdings Ltd | Real estate | 2024 |
| C a a Driver Services Limited | Transport & logistics | 2015 |
| C a Event Productions Ltd | Arts & recreation | 2017 |
| C a Martell UK Ltd | Construction | 2024 |
| C and P Integrated Systems Ltd | Administrative & support | 2019 |
| C and S Headingley Ltd | Hospitality | 2026 |
| C B Smart Improvements Ltd | Administrative & support | 2016 |
| C B Steamship Limited | Professional & scientific | 2025 |
| C C Continental Super Store Limited | Wholesale & retail | 2000 |
| C C Hair & Beauty Ltd | Wholesale & retail | 2011 |
| C C Law Limited | Professional & scientific | 2003 |
| C C Properties (Leeds) Limited | Real estate | 2020 |
| C C Properties (Yorkshire) Ltd | Real estate | 2014 |
| C C Properties Investment Ltd | Real estate | 2014 |
| C C S Neon Limited | Manufacturing | 1993 |
| C Cairns Properties Ltd | Real estate | 2026 |
| C Diem Consulting Ltd | Professional & scientific | 2018 |
| C E Johnson Business Training Limited | Professional & scientific | 1996 |
| C F Abraham Limited | Wholesale & retail | 1960 |