| Brooke Design Solutions Limited | Professional & scientific | 2021 |
| Brooke Gardens Residents Association Limited | Households | 2004 |
| Brookes-Rose Limited | Information & communication | 2026 |
| Broquet International Limited | Wholesale & retail | 1987 |
| Brotheridge Pubs Ltd | Hospitality | 2025 |
| Brough James Limited | Administrative & support | 2016 |
| Brown and Cockerill Property Services Limited | Real estate | 2012 |
| Brownells (UK) Limited | Wholesale & retail | 2005 |
| Brownpower Engineering Limited | Extraterritorial | 2018 |
| Browns Enterprises (WM) Limited | Other services | 2017 |
| Brownsover Fish Bar Limited | Hospitality | 2016 |
| Broyonie Limited | Construction | 2006 |
| Bruce Sewell Building Ltd | Construction | 2025 |
| Brunswick Mews (Management) Limited | Administrative & support | 2005 |
| Brusha CIC | Health & social care | 2024 |
| BS Glam Ltd | Other services | 2024 |
| Bsdesign Limited | Professional & scientific | 2002 |
| BSM Fleet Support Limited | Wholesale & retail | 2026 |
| BSP International Limited | Wholesale & retail | 1977 |
| Bspk Designs Ltd | Professional & scientific | 2025 |
| Bsso 2023 Ltd | Wholesale & retail | 2023 |
| BT Tyres (Rugby) Limited | Wholesale & retail | 2018 |
| Bubble Luxe Events Ltd | Wholesale & retail | 2018 |
| Bubbles Enterprises Limited | Real estate | 2014 |
| Bubblycious UK Limited | Hospitality | 2019 |
| Buckingham Property Management Limited | Administrative & support | 2000 |
| Buckingham School of Setting OUT Engineering Ltd | Professional & scientific | 2022 |
| Budziszewski Transport Limited | Transport & logistics | 2015 |
| Buhlmann UK Limited | Manufacturing | 2002 |
| Building 5 Limited | Real estate | 2020 |
| Building Maintenance and Electrical Ltd | Construction | 2022 |
| Building Support Ltd | Real estate | 2016 |
| Bulbs & Tools Limited | Wholesale & retail | 2008 |
| Bull Fabrications Limited | Manufacturing | 2013 |
| Bulldog Blinds & Shutters Ltd | Construction | 2024 |
| Bultrans Logistics Limited | Transport & logistics | 2017 |
| Bumps & Scratches Limited | Wholesale & retail | 2015 |
| Burcridge Limited | Wholesale & retail | 2005 |
| Burd 101 Limited | Real estate | 2022 |
| Burd 102 Limited | Real estate | 2022 |
| Burger Factory UK Limited | Hospitality | 2025 |
| Burger Guys 2 Rugby Ltd | Hospitality | 2026 |
| Burger Guys Rugby Limited | Hospitality | 2025 |
| Burgess Design Studio Ltd | Professional & scientific | 2021 |
| Burn Healthcare Ltd | Health & social care | 2024 |
| Burrows Talent Consulting Limited | Administrative & support | 2017 |
| Bush Hill Farm LLP | | 2009 |
| Business Change Ltd | Professional & scientific | 2005 |
| Business Mastery Success Limited | Professional & scientific | 2018 |
| Business Open Source Solutions Ltd | Professional & scientific | 2016 |
| Butterflies Playhouse Ltd | Health & social care | 2024 |
| Buy & LET Live Ltd | Real estate | 2019 |
| Buzamurga Ltd | Transport & logistics | 2019 |
| BWP Rugby Ltd | Real estate | 2021 |
| Byond Gifts Ltd | Real estate | 2023 |
| Byonder Ltd | Hospitality | 2023 |
| Byteopera Limited | Information & communication | 2022 |
| Bytes at Risk Limited | Wholesale & retail | 2022 |
| Byveyl Ltd | Wholesale & retail | 2025 |
| C & G Duncan Property Holdings Limited | Real estate | 2024 |
| C & N Bell Limited | Wholesale & retail | 2012 |
| C & N Properties (Midlands) Ltd | Construction | 2002 |
| C Dixey & Co Ltd. | Professional & scientific | 2019 |
| C E Construction Limited | Construction | 2014 |
| C Gould Ltd | Professional & scientific | 2020 |
| C Hyam Property Solutions Ltd | Financial services | 2020 |
| C J Williams Ltd | Construction | 2025 |
| C N Catering Limited | Hospitality | 2022 |
| C Oldham Services Ltd | Construction | 2023 |
| C Pixel Ltd | Arts & recreation | 2025 |
| C&G Duncan Ltd | Administrative & support | 2020 |
| C&S Homes (Rugby) Limited | Real estate | 2020 |
| C-M P&R Limited | Wholesale & retail | 2025 |
| C.P Paving & Ground Solutions Limited | Construction | 2026 |
| C.P.R. Specialists Limited | Wholesale & retail | 2004 |
| C3 AYO Logistic Ltd | Transport & logistics | 2015 |
| C3 Post Trade Limited | Information & communication | 2001 |
| C4-HEALTH Ltd. | Professional & scientific | 2015 |
| CAB11 Ltd | Transport & logistics | 2026 |
| Caba Trustees Limited | Financial services | 1981 |
| Cadman Homes ( UK) Limited | Real estate | 2008 |
| Cafe VIN Cinq by AMT LLP | | 2024 |
| Caffe Vita Ltd | Hospitality | 2013 |
| Caffee Mimi Ltd | Hospitality | 2026 |
| Caffeinated Design Ltd | Manufacturing | 2022 |
| Caines Transport Limited | Transport & logistics | 2018 |
| Cairngorm Contracts Limited | Construction | 2026 |
| Caldecott Property Sales & Lettings Limited | Real estate | 2024 |
| Calder Valley Skip Hire Limited | Manufacturing | 1999 |
| Cali Trans Limited | Transport & logistics | 2012 |
| Caliber Medical Services Ltd | Health & social care | 2016 |
| Calita Nutraceuticals Ltd | Manufacturing | 2020 |
| Call-A-Car (Rugby) Limited | Transport & logistics | 2009 |
| Calland Capital Limited | Financial services | 2025 |
| Calmly OPS Limited | Professional & scientific | 2024 |
| Calvario Limited | Other services | 2017 |
| Camblesforth Solar Farm Limited | Energy | 2019 |
| Cambs Tutors Ltd | Education | 2023 |
| Camer Engineering Limited | Professional & scientific | 2018 |
| Camtech Engineering Solutions Ltd | Administrative & support | 2023 |