| Buxton Development Partnership Limited | Construction | 2002 |
| Buzybars Limited | | 1984 |
| BVH 3 Ltd | Real estate | 2008 |
| Byssus Ltd | Information & communication | 2001 |
| Byway Properties Limited | Real estate | 1998 |
| Bywood Asphalt Limited | Construction | 2001 |
| C & C (Southern) Property Services Limited | Administrative & support | 2005 |
| C & E Electrical Wholesale Limited | Wholesale & retail | 2006 |
| C & H Developments Limited | Construction | 2008 |
| C & P Studios Limited | Water & waste | 1987 |
| C & S Trading (UK) Limited | Manufacturing | 2002 |
| C a Object Technology Ltd | Information & communication | 1995 |
| C a P Services Limited | Real estate | 1999 |
| C and D Ceilings Limited | Construction | 2003 |
| C E Hall Optometrists Limited | Health & social care | 1998 |
| C J a Developments Limited | Administrative & support | 2007 |
| C. FRY Transport Limited | Information & communication | 1973 |
| C.A.M. Property Solutions Limited | Real estate | 2018 |
| C.C. Scaffolding (Surrey) Limited | Construction | 1990 |
| C.C. Vapourvac Company Limited | | 1969 |
| C.M.W. Car Sales Limited | Wholesale & retail | 1986 |
| C.T. Accountants Limited | Professional & scientific | 2007 |
| CA Accounting Ltd | Professional & scientific | 2007 |
| Cable Right Limited | Other services | 2004 |
| Cablechip Solutions Limited | Information & communication | 1996 |
| Cadog Property Investment Limited | Administrative & support | 2000 |
| Cadology Limited | Information & communication | 1988 |
| Cadraft (UK) Ltd | Professional & scientific | 2005 |
| Cadsmart Limited | Professional & scientific | 2008 |
| Caer Beris Limited | Real estate | 2002 |
| Cafe 377 Limited | Hospitality | 2006 |
| Caffe Zone Ltd | Administrative & support | 2018 |
| Cagate Limited | Professional & scientific | 1977 |
| Caithness Housing Projects Limited | | 1985 |
| Cakecrackle.Com Limited | Manufacturing | 2025 |
| Calcott Estates Limited | Real estate | 1929 |
| Caldanal Limited | Professional & scientific | 2026 |
| Calderdale Geoscience Limited | Professional & scientific | 2004 |
| Caledonian Helicopters Limited | Administrative & support | 1970 |
| Calibra Tree Surgeons Limited | Administrative & support | 2006 |
| Call Print Co-Operative Limited | Manufacturing | 1984 |
| Callisto Development Limited | Information & communication | 1998 |
| Calver Groom Limited | Financial services | 2006 |
| Camberley Engineers Limited | Professional & scientific | 1999 |
| Camberley Heath Limited | Arts & recreation | 2003 |
| Camberley Precision Sheetmetal Limited | Manufacturing | 2006 |
| Camberley Removals Limited | Other services | 1996 |
| Camberley Service Centre Ltd | Wholesale & retail | 2003 |
| Cambus Consulting Limited | Professional & scientific | 1999 |
| Camcor Associates Ltd | Information & communication | 2003 |
| Camellia Solutions Ltd | Information & communication | 2007 |
| Camera Continental Limited | Wholesale & retail | 1964 |
| Cameron Building and Landscaping Services Ltd | Construction | 2007 |
| Cameron Moore Accountancy Limited | Professional & scientific | 2026 |
| Campaign Marketing Limited | Professional & scientific | 1997 |
| Campbell Mansions (Southsea) Management Company Limited | Households | 1977 |
| Campmoss Property Developments Limited | Real estate | 1983 |
| Canaryshire Limited | Financial services | 1994 |
| Canasway Limited | Real estate | 2003 |
| Caneco Construction Limited | Professional & scientific | 2003 |
| Cannyx Markets UK Ltd | Health & social care | 2019 |
| Canzona Music Limited | Professional & scientific | 2002 |
| Caos Media Design Ltd. | Professional & scientific | 2005 |
| Capelli Limited | | 1980 |
| Capital Car Colours (Croydon) Limited | Wholesale & retail | 1999 |
| Capital Consulting Limited | Professional & scientific | 2001 |
| Capital Distribution Limited | | 1999 |
| Capitol Air Conditioning Services Ltd | Construction | 2006 |
| Capitol Carpets Limited | Construction | 1954 |
| Capricorn Business Consulting Ltd | Financial services | 1999 |
| Capsaris (UK) Limited | Wholesale & retail | 2004 |
| Cara Services Limited | Administrative & support | 2007 |
| Cardiac Diagnostic Group Ltd | Health & social care | 2024 |
| Cardinal Management Solutions Limited | Professional & scientific | 2020 |
| Cards Exclusive Limited | | 1985 |
| Careers in Depth for Organisations Limited | Administrative & support | 2004 |
| Careers in Depth Limited | Education | 2003 |
| Carinya Properties Limited | Real estate | 2022 |
| Carlingold Limited | Real estate | 1978 |
| Carlton Assets Ltd | Real estate | 2019 |
| Carlton Financial Consulting Limited | Administrative & support | 2000 |
| Carlton Holdings (2020) Ltd | Financial services | 2020 |
| Carlton Place (Weybridge) Residents Management Company Limited | Real estate | 2004 |
| Carlton Training and Consulting Limited | Professional & scientific | 2000 |
| Carlton Trustee Services Ltd | Administrative & support | 1986 |
| Carlyle Executive Search Ltd | Administrative & support | 2014 |
| Carmule Investments Limited | Real estate | 1998 |
| Carnegie-Edison Infrastructure (Holdings) Ltd | Professional & scientific | 2018 |
| Carnoustie Investments Limited | Real estate | 2002 |
| Carousel Nursery (London) Limited | Education | 2003 |
| Carpet & Flooring Co (Fleet) Limited | Wholesale & retail | 2003 |
| Carps Property & Trading Limited | Real estate | 2006 |
| Cartonmate Limited | | 1995 |
| Cartoons R FUN Limited | Arts & recreation | 1991 |
| Cartronics GB Limited | Manufacturing | 2003 |
| Cashcrest Limited | | 1987 |
| Cast & Ellis Ltd | Professional & scientific | 2002 |
| Castle Court Land Investments Limited | Real estate | 1989 |
| Castle Court Property Developments Limited | Construction | 1990 |
| Castle Electrical Contractors (Surrey) Ltd | Construction | 2023 |