| Blue Toucan Consulting Limited | Information & communication | 2005 |
| BOAT32.COM Limited | Information & communication | 2004 |
| Body Image (Hampshire) Limited | Other services | 2005 |
| Bojjawar Limited | Health & social care | 2020 |
| Bojjawar Property Ltd | Real estate | 2025 |
| Boler Wiseman Limited | Professional & scientific | 1999 |
| Bond HSE Limited | Professional & scientific | 2003 |
| Bonuzzi Leather Brokers Limited | Wholesale & retail | 2000 |
| Boomerang ED Limited | Professional & scientific | 2002 |
| Bordon Park Limited | Hospitality | 2017 |
| Borodin Close Management Company Limited | Extraterritorial | 2000 |
| BP Rolls Holdings Limited | Financial services | 2014 |
| Bradley and Leng Ltd. | Real estate | 1996 |
| Bramley Indian Limited | Hospitality | 2025 |
| Brandchange Limited | Hospitality | 1987 |
| Breeze Construction Limited | Construction | 2000 |
| Breeze Sports Ltd. | Wholesale & retail | 1999 |
| Brick Nest Consultancy Ltd | Real estate | 2018 |
| Bridgnorth Tyre Centre Ltd | Extraterritorial | 1999 |
| Brighton Road Mansions Limited | Real estate | 1995 |
| Brilliant Bathrooms Ltd | Construction | 1984 |
| Britonova UK Ltd | Wholesale & retail | 2025 |
| Brittrade Solutions Ltd | Wholesale & retail | 2024 |
| Broadway Creative Printing Services Limited | Manufacturing | 1999 |
| Brockhurst Car Sales Limited | Wholesale & retail | 2021 |
| Brookson (5423I) Limited | Administrative & support | 2007 |
| Brown FOX Consultancy Limited | Professional & scientific | 2004 |
| Browning Electrical Services Limited | Construction | 2007 |
| Bryan Jezeph Consultancy Limited | Professional & scientific | 1995 |
| Buckland Garden Services Ltd | Administrative & support | 2003 |
| Buildfine Estates Ltd | Construction | 2004 |
| Bullsouth Ltd | Professional & scientific | 1996 |
| Bulwark Limited | Professional & scientific | 2003 |
| Buonacorsi Consulting Limited | Professional & scientific | 1995 |
| Burning Pine Limited | Professional & scientific | 2007 |
| Burnt Mill Estates Limited | Real estate | 1987 |
| Burnt Mill Property Management Limited | Real estate | 1987 |
| Business Development Specialists Limited | Extraterritorial | 1991 |
| Business Impact Solutions Limited | Professional & scientific | 2005 |
| Business Intelligence and Assurance Solutions Limited | Information & communication | 2006 |
| Buttercups Day Nursery Limited | Education | 2006 |
| Bymed Limited | Administrative & support | 1980 |
| Byrne Longshore & Company Limited | Professional & scientific | 2001 |
| C & M Contractors & Designers Limited | Wholesale & retail | 1992 |
| C & S Developments Limited | Construction | 2004 |
| C & S Entertainment Limited | Transport & logistics | 1999 |
| C Kelly Brickwork Services Limited | Construction | 2006 |
| C Monks & Co Ltd | Other services | 2018 |
| C&J Estates Limited | Real estate | 2007 |
| C-Salt Marine Limited | Financial services | 2006 |
| C. a. Crane Limited | Wholesale & retail | 2000 |
| C.E.W. Saunders (Odiham) Limited | Agriculture & fishing | 1963 |
| C.W.K. Services Limited | | 1993 |
| C3 Financial Systems Limited | Information & communication | 2004 |
| Cabelos Limited | Other services | 2003 |
| Cablehand Limited | Information & communication | 1984 |
| Cadprint Limited | Professional & scientific | 1987 |
| Cage Services Limited | Arts & recreation | 2007 |
| Cairns Medical Aviation Services Ltd | Other services | 2017 |
| Caley's Cocoa Cafe Limited | Professional & scientific | 2004 |
| Calibre Securities Limited | Real estate | 1992 |
| Callvan | | 2000 |
| Cambridge Garage (Farnborough) Limited | Wholesale & retail | 1954 |
| Cambridge Garage (Holdings) Limited | Professional & scientific | 1985 |
| Cambridge Road Residents Association Limited | Households | 2000 |
| Cambrook Foods Limited | Administrative & support | 2011 |
| Camellia Court Residents Association Limited | Households | 1996 |
| Camomile Consulting Limited | Professional & scientific | 2007 |
| Campbell Environmental OIL Limited | Manufacturing | 2005 |
| Cancrest Limited | Construction | 2005 |
| Cannon Datacom Limited | Extraterritorial | 1991 |
| Cannon Electric (Great Britain) Limited | Professional & scientific | 1952 |
| Canon Homes Limited | Construction | 2002 |
| Capital Accounting Limited | Professional & scientific | 2000 |
| Captured Moment Limited | Manufacturing | 2000 |
| Cardinal Commodities (Import Export) Limited | Transport & logistics | 1989 |
| Care Together Limited | Health & social care | 2004 |
| Carers Together Trading Limited | Wholesale & retail | 2007 |
| Carlton Valley Fabrications Limited | | 1987 |
| Carpe Diem Property Management Limited | Real estate | 2006 |
| Carpet and Fabric Care UK Limited | Other services | 2003 |
| Carrera Business Systems Limited | Transport & logistics | 1988 |
| Cast Communications Limited | Administrative & support | 2004 |
| Castle Street Flowers Limited | Wholesale & retail | 2007 |
| Catalina (UK) Limited | Manufacturing | 2002 |
| Caterbuy Limited | Professional & scientific | 2000 |
| Cathedral Business Consultants Limited | Professional & scientific | 2004 |
| Cathedral Lettings and Property Management Limited | Real estate | 2004 |
| Catling Creative Limited | Arts & recreation | 2006 |
| Causeway Carriers Limited | Transport & logistics | 2001 |
| Cawteco Limited | Wholesale & retail | 2002 |
| Cci-Hq Limited | Professional & scientific | 2014 |
| Cengage Learning (Emea) Limited | Information & communication | 1967 |
| Cengage Learning UK Holdings Limited | Professional & scientific | 1980 |
| Centre Crescent Limited | Households | 1983 |
| Centre Driveways Limited | Construction | 2003 |
| Cephalo Jungo Ltd | Professional & scientific | 2025 |
| Ceramics Cafe Limited | Wholesale & retail | 2000 |
| CFP EOT Limited | Financial services | 2024 |
| Champion Decorating Limited | Construction | 2002 |