| Buy the Moment Ltd | Wholesale & retail | 2025 |
| Buyblitz Limited | Wholesale & retail | 2025 |
| Buyboxstore Ltd | Wholesale & retail | 2025 |
| Buybrandtools Limited | Wholesale & retail | 2002 |
| Buymio Ltd | Wholesale & retail | 2025 |
| Buytonic Ltd | Wholesale & retail | 2025 |
| Buzz Engineering Limited | Manufacturing | 2019 |
| Buzz Law Limited | Professional & scientific | 2014 |
| Buzz Maid Yorkshire Ltd | Administrative & support | 2023 |
| Buzzboxx Data Solutions Limited | Information & communication | 2008 |
| BV Properties Limited | Real estate | 2012 |
| BV Shutters & Shop Fronts Services Limited | Manufacturing | 2023 |
| BVL Carp Fishing Ltd | Agriculture & fishing | 2023 |
| BW & AO Ltd | Hospitality | 2023 |
| BW Auto's Ltd | Wholesale & retail | 2024 |
| BW Commercial Surveyors Limited | Real estate | 2023 |
| BW Healthcare Surveyors Limited | Real estate | 2017 |
| BW Plumbing and Maintenance Limited | Construction | 2022 |
| BW Real Estate Ltd | Real estate | 2020 |
| BW Renewables Ltd | Construction | 2023 |
| BWF Electrical Ltd | Construction | 2016 |
| Bwise Property Ltd | Real estate | 2021 |
| Bwise Property Serviced Apartments Ltd | Real estate | 2018 |
| BWJ Healthcare Holdings Ltd | Real estate | 2024 |
| BWW Properties Ltd | Real estate | 2015 |
| BXD Systems Ltd | Information & communication | 2022 |
| BXH Holdings Limited | Professional & scientific | 2016 |
| BXH Limited | Wholesale & retail | 1961 |
| BY Appointment Limited | Administrative & support | 2001 |
| BY Bounty Ltd | Wholesale & retail | 2023 |
| BY Bridie Brows Ltd | Other services | 2025 |
| BY Julia Bakay Ltd | Education | 2022 |
| BY MIA Scarlett Ltd | Wholesale & retail | 2026 |
| BY the Hook Creations Ltd | Manufacturing | 2023 |
| Byameeera Ltd | Other services | 2026 |
| Byek Productions Ltd | Education | 2021 |
| Byharleystore Ltd | Wholesale & retail | 2026 |
| Byprocess Ltd | Administrative & support | 2025 |
| Byrn Ltd | Other services | 2022 |
| Byrom Audiology Ltd | Health & social care | 2015 |
| Byron Acquisitions Ltd | Financial services | 2022 |
| Byron House S7 Ltd | Hospitality | 2025 |
| Byron Property Ltd | Real estate | 2025 |
| Byte Energy Limited | Information & communication | 2025 |
| Byte IT Computers Ltd | Manufacturing | 2016 |
| Byteprime Consulting Limited | Information & communication | 2025 |
| Bywater TV Crews Ltd | Information & communication | 2013 |
| BZ Napoli 62 Ltd | Hospitality | 2025 |
| Bz.M Holdings Ltd | Real estate | 2022 |
| Bzhar Holdings Ltd | Professional & scientific | 2024 |
| C & a Haulage Ltd | Transport & logistics | 2016 |
| C & B Developments (South Yorkshire) Ltd | Construction | 2018 |
| C & C Painting Contractors Limited | Construction | 2012 |
| C & D Catering Worrall Limited | Hospitality | 2016 |
| C & D Express Transport Limited | Transport & logistics | 1995 |
| C & G Artpartment CIC | Arts & recreation | 2022 |
| C & J Limited | Hospitality | 2017 |
| C & K Investments UK Limited | Real estate | 2006 |
| C & M Couriers Direct Limited | Transport & logistics | 2007 |
| C & R Hadi Property Ltd | Real estate | 2024 |
| C & S Leasing Limited | Administrative & support | 2009 |
| C a Air-Conditioning Ltd | Construction | 2019 |
| C a B Transport Limited | Transport & logistics | 2012 |
| C a Delivery and Collection Service Limited | Transport & logistics | 2024 |
| C a Fields International Limited | Wholesale & retail | 1997 |
| C B Property Holdings Ltd | Real estate | 2017 |
| C Bajwa Tennis Ltd | Arts & recreation | 2024 |
| C Collins Property Limited | Real estate | 2021 |
| C D Joinery & Building Ltd | Construction | 2021 |
| C D Pocock Ltd | Other services | 2022 |
| C D Scaffolding Limited | Construction | 2002 |
| C Duncan Limited | Arts & recreation | 2016 |
| C Eyre Limited | Professional & scientific | 2017 |
| C F Maintenance Services Limited | Professional & scientific | 2016 |
| C G Carlisle & Company Limited | Professional & scientific | 1923 |
| C G Waddington Limited | Professional & scientific | 2022 |
| C I C I N I Limited | Hospitality | 2024 |
| C J Hartley Ltd | Other services | 2012 |
| C J Moss Consultancy Limited | Professional & scientific | 2012 |
| C J Osteopathy Limited | Health & social care | 2004 |
| C J R Design Solutions Limited | Professional & scientific | 2014 |
| C J Signs Limited | Manufacturing | 2011 |
| C J Woodhead & Co Limited | Professional & scientific | 2002 |
| C Jackson Plumbing & Plastering Ltd | Construction | 2023 |
| C Landscapes Limited | Administrative & support | 2024 |
| C Leach Properties Limited | Real estate | 2018 |
| C M Baker Decorating Limited | Construction | 2006 |
| C M D Marketing Ltd | Other services | 2020 |
| C M P Interiors Limited | Construction | 2008 |
| C Minibus Hire Ltd | Information & communication | 2022 |
| C Mitchell Roofing Limited | Construction | 2016 |
| C Moon Software Ltd | Information & communication | 2019 |
| C N Surfacing Limited | Administrative & support | 2024 |
| C Northfield Holdings Ltd | Financial services | 2022 |
| C Peruch Limited | Wholesale & retail | 2022 |
| C Pollard Design Ltd | Professional & scientific | 2013 |
| C R Tools Limited | Manufacturing | 2015 |
| C R Vision Ltd | Information & communication | 2025 |
| C Reid Limited | Health & social care | 2003 |
| C Rudrum & Sons Limited | Wholesale & retail | 1957 |