| Buckingham Park (Weedon Hill) Management Company Limited | Households | 2008 |
| Buckingham Walk Management Company Limited | Households | 2000 |
| Buckland House Management Company Limited | Households | 2012 |
| Buckland Rise (Peters Village) Management Company Ltd | Real estate | 2019 |
| Buckthorn Grange Management Company Limited | Households | 2019 |
| Buckton Fields West Management Company Limited | Households | 2019 |
| Budbrooke Barton Management Limited | Households | 2007 |
| Budmouth Mews Management Company Limited | Households | 2016 |
| Bull Lane Apartments (Management) Company Limited | Households | 2003 |
| Bunny Creek Barton Ltd | Hospitality | 2015 |
| Burford Road Witney Management Company Limited | Households | 2004 |
| Burghfield Place Management Company Limited | Households | 2007 |
| Burrington Estates (Church Hill) Management Ltd | Households | 2019 |
| Burrington Estates (Hempton Road) Management Company Limited | Households | 2021 |
| Burrow Hill Park Management Company Limited | Households | 2019 |
| Burrows and Walker Limited | Administrative & support | 2018 |
| Bury Mews Residents Company Limited | Households | 2004 |
| Business in Evolution Ltd | Professional & scientific | 2014 |
| Busy BEA Cleaning Limited | Administrative & support | 2015 |
| Butterfields Management Company Limited | Households | 2010 |
| Butts Lane (Maple Park) Management Company Limited | Households | 2015 |
| Byewaters (NO 2) Apartment Management Company Limited | Households | 1998 |
| Byewaters (NO.1) Apartment Management Company Limited | Households | 1998 |
| Bysouth Corporate Services LLP | | 2011 |
| C B Upholstery Limited | Manufacturing | 2012 |
| C Woodford Engineering Ltd | Wholesale & retail | 2022 |
| CAE Ffwrnais Residents Management Company Limited | Households | 2007 |
| Caerwent Close Management Company Limited | Households | 2018 |
| Cafe Fields (Puckeridge) Management Company Limited | Households | 2020 |
| Cala at Kingsmere Management Company Limited | Households | 2019 |
| Cala at Whitehouse (Phase Two) Management Company Limited | Households | 2019 |
| Cala at Whitehouse Management Company Limited | Households | 2018 |
| Caldecott Manor (Rugby) Management Company Limited | Households | 2008 |
| Cali Campers Limited | Wholesale & retail | 2014 |
| Calibrex Limited | Professional & scientific | 1993 |
| California Road Management Company Limited | Households | 2013 |
| Callister Spray Painting Ltd | Construction | 2019 |
| Camdan Limited | Administrative & support | 2015 |
| Camp Sight Ltd | Wholesale & retail | 2026 |
| Campton Fields Management Limited | Households | 2017 |
| Candid Media Ltd | Information & communication | 2008 |
| Cane Hill Park (Coulsdon) Management Company Limited | Administrative & support | 2015 |
| Cane Hill Park (Gateway) Management Company Limited | Households | 2017 |
| Canes Meadow (Brixton) Management Company Limited | Real estate | 2016 |
| Canine Clips Academy Ltd. | Other services | 2019 |
| Cannon Technologies Europe Ltd | Manufacturing | 1993 |
| Cannon Technologies Group Limited | Professional & scientific | 1996 |
| Cannon Technologies Limited | Manufacturing | 1978 |
| Cannon Telecomms Limited | Wholesale & retail | 2001 |
| Capacity Matters Ltd | Health & social care | 2011 |
| Capozza 1955 Ltd | Wholesale & retail | 2020 |
| Care Leaders Consultancy Ltd | Professional & scientific | 2025 |
| CARELINE365 Limited | Health & social care | 2015 |
| Cargo Plot Management Company Limited | Real estate | 2007 |
| Carlton Avenue (Block a & B) Management Company Limited | Households | 1992 |
| Carlton Avenue (Block D) Management Company Limited | Households | 1992 |
| Carlton Avenue (Block E) Management Company Limited | Households | 1992 |
| Carlton Avenue (Block G) Management Company Limited | Households | 1991 |
| Carlton Crescent RTM Company Limited | Households | 2005 |
| Carlton House Rest Home Limited | Health & social care | 2010 |
| Carnaval Gardens Management Ltd | Households | 2016 |
| Carnegie Court Management Company (Bassaleg) Limited | Real estate | 2017 |
| Carnon Downs Management Company Limited | Households | 2021 |
| Carnsmerry Meadow Amenity Areas Management Company Limited | Households | 2008 |
| Carriage Quarter Management Company Limited | Households | 2022 |
| CAS Care Solutions Ltd | Health & social care | 2020 |
| CAS Training Solutions Ltd | Education | 2026 |
| Castell Maen Management Company Limited | Households | 2007 |
| Castle Bay Construction Ltd | Construction | 2022 |
| Castle Gate (Lincoln) Management Company Limited | Administrative & support | 2006 |
| Castle Gate Freehold Limited | Real estate | 2015 |
| Castle Hill Management Co. (Reading) Limited | Real estate | 1981 |
| Castle Meadows (Telford) Management Company Limited | Households | 2008 |
| Castle Park (West Durrington) Management Company Limited | Households | 2021 |
| Castles Developments Ltd | Construction | 2019 |
| Castles Holdings Ltd | Financial services | 2023 |
| Castles Inns Ltd | Hospitality | 2018 |
| Caterina Folisi Ltd | Health & social care | 2025 |
| Cateris Consulting Limited | Professional & scientific | 2012 |
| Catesby Grange (Rugby) Management Company Limited | Households | 2007 |
| CAV House Management Company Limited | Administrative & support | 2010 |
| Cavaletti Clothing Limited | Wholesale & retail | 2004 |
| Cavalry Gardens Management Limited | Households | 2020 |
| Cavendish Wharf Management Company Limited | Households | 2008 |
| CB Decor Ltd | Construction | 2022 |
| Cbrt Healthcare Innovation Systems Limited | Health & social care | 2015 |
| Cedars 3 Management Company Limited | Households | 2023 |
| Celandine Drive (Area D) Management Company Limited | Households | 2006 |
| Celtic Downs (2) Management Company Limited | Households | 2004 |
| Celtic Horizon (Phases 5 & 6) Management Company Limited | Households | 2005 |
| Celtic Horizon (the Triangle) Management Company Limited | Households | 2008 |
| Centenary Quay Management Limited | Households | 2010 |
| Centennial Management Limited | Administrative & support | 2019 |
| Central 2010 Limited | Hospitality | 2010 |
| Central House (Exeter) Limited | Households | 2010 |
| Centric Mews Management Company Limited | Households | 2014 |
| Centro Ealing Management Company Limited | Households | 2008 |
| Centurion Grove at Burton Latimer Management Company Limited | Households | 2014 |
| Centurion Meadows (Burley) Management Company Limited | Households | 2023 |
| Centurion Place (Milton Keynes) Management Company Limited | Households | 2017 |