| Blue Peacock Studio Limited | Manufacturing | 2020 |
| Bluebell Opticom Ltd | Manufacturing | 2003 |
| Bluecap Surveying Ltd | Professional & scientific | 2025 |
| Bluehazel Limited | Information & communication | 2006 |
| BMC TV Ltd | Information & communication | 2007 |
| Bookham Engineering (Contracts) Limited | Real estate | 1967 |
| Boomheath Limited | Households | 1982 |
| Bornrow Management Company Limited | Households | 1977 |
| Boskerris Ltd | Hospitality | 2020 |
| Both Barrels Productions Limited | Administrative & support | 2014 |
| Botulinum Central Suppliers UK Ltd | Wholesale & retail | 2023 |
| Boulters (Slough) Management Company Limited | Households | 1984 |
| Bourne END Community Trading Limited | Hospitality | 1989 |
| Bourne END Jewellers Limited | Wholesale & retail | 2006 |
| Bpep International Limited | Professional & scientific | 2003 |
| Brackendale Court (Management Company) Limited | Households | 2002 |
| Bramble Lane Management Limited | Extraterritorial | 2006 |
| Brambles (Cowley) Management Limited | Households | 1987 |
| Branden Lodge Limited | Households | 1994 |
| Branksome Cliff Beach Chalets (Management) Limited | Households | 1978 |
| Brantridge Healthcare Management Ltd | Professional & scientific | 2023 |
| Bredlands Management Ltd | Households | 2018 |
| Bridge Crew Ltd | Professional & scientific | 2023 |
| Bridge END Lofts Limited | Households | 2000 |
| Bright GEM Accountants Ltd | Professional & scientific | 2025 |
| Bright Scene Limited | Real estate | 2006 |
| Bright Vines Communications Ltd | Professional & scientific | 2016 |
| Brislington (Pooles Court Yard) Management Company Limited | Households | 2004 |
| British Film Designers Guild Limited | Other services | 1982 |
| Brittons Solicitors Limited | Professional & scientific | 2011 |
| Broad Lane (Bramley) Limited | Households | 1998 |
| Brockley Court (Sidcup) Management Limited | Households | 2005 |
| Brook House Residents Association (Radlett) Limited | Households | 1974 |
| Brooke Software Limited | Information & communication | 2009 |
| Brookwood Farm (Woking) Management Company Limited | Households | 2014 |
| Brunswick Quay (105-109) Management Limited | Households | 1986 |
| Bryncleddau (Caerphilly) Management Company Limited | Households | 2006 |
| Buccaneer Solutions Ltd | Manufacturing | 2025 |
| Buckingham Gate Management Company Limited | Households | 2004 |
| Buckinghamshire Locksmiths Ltd | Administrative & support | 2025 |
| Buildjewel Property Management Limited | Extraterritorial | 2000 |
| Burger Kitchen Ltd | Hospitality | 2024 |
| Burhill Homes Limited | Construction | 1998 |
| Burnaby Court Management Company Limited | Households | 1991 |
| Burttress Enterprises Limited | Real estate | 1963 |
| Business & Personal Investment Limited | Financial services | 1999 |
| Business Database Publishing Limited | Professional & scientific | 1990 |
| Bwasoc | Other services | 2012 |
| C K Removals Limited | Transport & logistics | 2019 |
| C R Residents Limited | Households | 2007 |
| Cabins UP Resin Down Ltd | Construction | 2023 |
| Calli London Ltd | Hospitality | 2024 |
| Campus Limited | Construction | 1929 |
| Canmore Canines Ltd | Wholesale & retail | 2003 |
| Carecross Properties Limited | Households | 1989 |
| Career-Minded People Limited | Administrative & support | 2007 |
| Careful Kelly Removals Limited | Transport & logistics | 2007 |
| Carlos Developments Limited | Financial services | 2004 |
| Carroll Accountants Ltd | Professional & scientific | 2012 |
| Carroll Financial Solutions Limited | Professional & scientific | 2015 |
| Case Design Limited | Manufacturing | 1988 |
| Cass Limited | Professional & scientific | 2025 |
| Castle Court (Sydenham) Residents Company Limited | Households | 1992 |
| Castle Hill House (Parkstone) Limited | Households | 2018 |
| Castle Mews (Caerphilly) Management Company Limited | Households | 2006 |
| Castle View Residents Association Limited | Households | 1969 |
| Catmar Associates Limited | Professional & scientific | 2015 |
| CCJ LLP | | 2010 |
| Cedar Court Management Company Limited | Households | 2001 |
| Cedars Park Residents Management Company Limited | Households | 2013 |
| Celtheath Limited | Manufacturing | 1990 |
| Chancery Court Brough Limited | Households | 2004 |
| Chandlers Quay Residents Association Limited | Households | 1997 |
| Chapel Lane (Bagshot) Management Company Limited | Households | 2021 |
| Chapelgate Residents Company Limited | Households | 2001 |
| Charis Travel Limited | Administrative & support | 2026 |
| Charlie Laing Limited | Professional & scientific | 2004 |
| Charlotte John Ltd | Administrative & support | 2009 |
| Charlotte Mews (Henley) Management Company Limited | Households | 2011 |
| Charlouis Limited | Extraterritorial | 2015 |
| Chatsworth Court Residents Management Company Limited | Households | 2001 |
| Chatsworth Products International Limited | Information & communication | 2008 |
| Chaucer Court Management Limited | Extraterritorial | 1971 |
| Chaucer Mews Canterbury (DWH) Management Co Ltd | Extraterritorial | 2003 |
| Chaucer Property Management Limited | Households | 2004 |
| Chbm Properties LLP | | 2006 |
| Cheaper Moves Ltd | Transport & logistics | 2026 |
| Chefs Thyme Ltd | Hospitality | 2025 |
| Chestnut Avenue Residents Company Limited | Households | 2010 |
| Chevin Court Management (Guiseley) Limited | Households | 2005 |
| Cheviot Court Management Company (Harlington) Limited | Households | 1989 |
| Chichairuk Limited | Other services | 2025 |
| Chilli Honey Holdings Ltd | Financial services | 2024 |
| Chiltern Aegis Ltd | Health & social care | 2018 |
| Chiltern Grange (Chesham) Management Company Limited | Households | 2014 |
| Chiltern Roofing Limited | | 1981 |
| Chimsoc Limited | Wholesale & retail | 2011 |
| Chorley Court Flats (Management) Limited | Households | 1991 |
| Chris Burke & SON Limited | Construction | 2010 |
| Churchfield Mews (Slough) Management Company Limited | Households | 1988 |