| Brainchild Ltd | Real estate | 2025 |
| Brancliffe Services Ltd | Health & social care | 2014 |
| Brasstone Limited | Hospitality | 1986 |
| Brentford Phase II LLP | | 2016 |
| Brian Cunningham Transport UK Ltd | Transport & logistics | 2011 |
| Brian Mount Ltd | Extraterritorial | 2024 |
| Brilliant Blue Ltd | Professional & scientific | 2023 |
| Briscfix Ltd | Construction | 2020 |
| British Sub-Aqua Club | Arts & recreation | 1979 |
| Britopia Global Limited | Extraterritorial | 2018 |
| Broccoli Services Limited | Professional & scientific | 2017 |
| Brock Limited | Construction | 1978 |
| Bromborough Security Centre UK Limited | Administrative & support | 2024 |
| Bromley Dental Practice Limited | Health & social care | 2011 |
| Brook Meadow (Mucklestone Road) Management Company Limited | Real estate | 2018 |
| Brookfield Dental Limited | Health & social care | 2025 |
| Broughton Park Management Company Limited | Real estate | 2020 |
| Brown Bear and FOX Coffee Ltd | Hospitality | 2023 |
| Browne's Dental Surgery Limited | Health & social care | 2014 |
| Browne’S Aesthetics Ltd | Health & social care | 2025 |
| Brownz Media Services Ltd | Information & communication | 2026 |
| Brunswick Care Limited | Administrative & support | 2017 |
| Bryn Road Alltami Limited | Real estate | 2023 |
| Bryn-Y-Grog Estates Limited | Administrative & support | 2023 |
| Bryn-Y-Grog Events Limited | Real estate | 2023 |
| BS Kent Limited | Health & social care | 2024 |
| BS Kent Services Ltd | Health & social care | 2026 |
| BS Plumbing and Heating (NW) Ltd | Construction | 2025 |
| BSC E-Commerce Ltd | Wholesale & retail | 2023 |
| BSV Bromley Care Ltd | Health & social care | 2026 |
| BSV Bromley Limited | Health & social care | 2024 |
| Bucketloads Limited | Other services | 2007 |
| Buckley Cars Limited | Transport & logistics | 2016 |
| Budget Maintenance Limited | Construction | 2003 |
| Budget Rodz Limited | Administrative & support | 2022 |
| Bull Inn Valley Limited | Hospitality | 2018 |
| Burkos Comp Ltd | Professional & scientific | 2022 |
| Butterfield MCR Limited | Manufacturing | 1985 |
| Buzz Bricks & Mortar Limited | Real estate | 2016 |
| BY Alexandra Santoro Ltd | Manufacturing | 2020 |
| Byblaney Limited | Professional & scientific | 2019 |
| Byteburst Marketing Limited | Professional & scientific | 2024 |
| C & E Cheshire Properties Ltd | Real estate | 2025 |
| C & E Property Services Ltd | Construction | 2021 |
| C a Design & Print Limited | Manufacturing | 2000 |
| C J Joinery North West Limited | Construction | 2006 |
| C SIM Limited | Health & social care | 2024 |
| C&C Dental Care Ltd | Health & social care | 2026 |
| C&N Medical Chambers Limited | Health & social care | 2021 |
| C&R Cleaning Solutions Ltd | Administrative & support | 2025 |
| C.G.M. Props Limited | Arts & recreation | 2016 |
| C.J. Harpur & Sons Civil Engineering Limited | Construction | 2002 |
| C2K Developments Limited | Construction | 2017 |
| C2K Property Ltd | Real estate | 2019 |
| CA Morris Ltd | Health & social care | 2024 |
| CAB Contract Services Limited | Professional & scientific | 2011 |
| CAE Ventilation Holdings Limited | Financial services | 2024 |
| CAE Ventilation Services Northern Limited | Manufacturing | 1998 |
| Cafasso Studios Ltd | Administrative & support | 2026 |
| Caffee ORO Limited | Hospitality | 2015 |
| Cage H Ltd | Health & social care | 2024 |
| Calbor Restorative Ltd | Health & social care | 2024 |
| Calrom Limited | Information & communication | 2007 |
| Calrom Management Limited | Information & communication | 2007 |
| Calrom TIG Co Ltd | Financial services | 2023 |
| Cambridge Financial and Economic Research Limited | Professional & scientific | 2020 |
| Campus Homes Ltd | Real estate | 2021 |
| CAN DO Payments Ltd | Information & communication | 2018 |
| Canal & River Trading CIC | Construction | 2012 |
| Canal & River Trust | Water & waste | 2011 |
| Canta CMC Solutions Limited | Professional & scientific | 2017 |
| Capcltr Ltd | Wholesale & retail | 2025 |
| Capcrave Limited | Households | 1990 |
| Cardiac Services Ltd | Health & social care | 2022 |
| Cardus Creatives Ltd | Professional & scientific | 2024 |
| CARE4YOU Clinics Ltd | Health & social care | 2021 |
| Carfleet Holdings Limited | Financial services | 2022 |
| Carfleet Wholesale Ltd | Wholesale & retail | 2005 |
| Caring Alternatives Limited | Health & social care | 1998 |
| Carl Birch Ltd | Construction | 2025 |
| Carline&Co Ltd | Other services | 2026 |
| Carpenter Fencing Ltd | Construction | 2024 |
| Carroll's Kitchens & Interiors Limited | Wholesale & retail | 2026 |
| Carroll's Kitchens Ltd | Wholesale & retail | 2023 |
| Cascenyx Limited | Extraterritorial | 2026 |
| Cashsend Limited | Financial services | 2016 |
| Casson Validation Solutions Ltd | Manufacturing | 2023 |
| Castleville Holdings Ltd | Health & social care | 2025 |
| Catabolt Ltd | Information & communication | 2022 |
| Catana Holdings Limited | Financial services | 2025 |
| Cave Orthodontics Ltd | Health & social care | 2025 |
| Cavendish M.O.T. Centre Limited | Wholesale & retail | 2002 |
| Cavi Logistics Ltd | Transport & logistics | 2025 |
| Cazdam Limited | Real estate | 2009 |
| CCL Swim School LLP | | 2018 |
| Cdfb Trading Community Interest Company | Wholesale & retail | 2010 |
| Cecc Consultancy Ltd | Construction | 2026 |
| Celestial Prizes Ltd | Other services | 2024 |
| Cemal Consultancy Limited | Professional & scientific | 2020 |
| Cemcore Ltd | Professional & scientific | 2025 |