| Casa DEI Bambini Montessori Ltd | Health & social care | 2022 |
| Casela Limited | Real estate | 2012 |
| Casira Limited | Real estate | 2023 |
| Casita Holdings Limited | Financial services | 2016 |
| Casita Student Living Limited | Real estate | 2016 |
| Cask & Butcher Limited | Hospitality | 2011 |
| Casnet Limited | Other services | 2008 |
| Cassar Holdings Limited | Financial services | 2023 |
| Cassar Property Limited | Real estate | 2022 |
| Castellum Cotswolds Limited | Construction | 2004 |
| Castellum House Management Limited | Households | 2024 |
| Castellum London (UK) Limited | Construction | 2013 |
| Cat Pumps (U.K.) Limited | Manufacturing | 1975 |
| CATALYST-4UR-GROWTH Limited | Professional & scientific | 2022 |
| Catalysta Limited | Professional & scientific | 2011 |
| Caterpillars Nursery School Limited | Health & social care | 2015 |
| Cavendish Green Limited | Administrative & support | 2011 |
| Cavendish Group International Limited | Information & communication | 1998 |
| CB High-Ticket Ltd | Wholesale & retail | 2024 |
| CB Jointing Services Limited | Construction | 2022 |
| CDH Consulting Ltd | Professional & scientific | 2020 |
| Cdpsoft Limited | Information & communication | 1994 |
| Cedar and Rock Ltd | Professional & scientific | 2016 |
| Cedar Lodge (Weybridge) Management Company Limited | Households | 2000 |
| Cedarwood Design and Build Ltd | Construction | 2025 |
| Celyn Homes Limited | Real estate | 2009 |
| Centaur Security Ltd | Other services | 2024 |
| Centre of the Universe Limited | Real estate | 2025 |
| Centurion Place (Esher) Management Company Limited | Households | 2025 |
| Ceox Ltd | Professional & scientific | 2017 |
| Cetquicad Limited | Administrative & support | 2008 |
| CFK Legal Limited | Real estate | 2019 |
| CFS Solutions Limited | Professional & scientific | 2003 |
| Cghill Medical Services Ltd | Health & social care | 2019 |
| CGM Farming Limited | Agriculture & fishing | 2015 |
| CGS Europe Limited | Manufacturing | 2010 |
| Channel Centric Limited | Professional & scientific | 2022 |
| Channel Chat Ltd | Information & communication | 2021 |
| Character Holdings Limited | Other services | 1957 |
| Charles Austen Pumps Limited | Manufacturing | 1957 |
| Charles Claire LLP | | 2010 |
| Charles Olivia Holdings Ltd | Real estate | 2026 |
| Charles Olivia Property Investments Ltd | Real estate | 2026 |
| Charles Russell Classic Cars LLP | | 2022 |
| Charlie's Sweet Treats Limited | Hospitality | 2018 |
| Charlotte Scott Therapy Ltd | Health & social care | 2022 |
| Chartfield Place (Weybridge) Management Company Limited | Real estate | 1999 |
| Chartwell BC Limited | Construction | 2015 |
| Chas. H. Challen (1804) Limited | Extraterritorial | 1985 |
| Chase Products (Engineering) Limited | Manufacturing | 1943 |
| Chase Products Associates LLP | | 2007 |
| Chase Products Holdings Limited | Professional & scientific | 2007 |
| CHASE55 Artefacts Limited | Professional & scientific | 2010 |
| Chaseley Court Residents Company Limited | Households | 1987 |
| Cheese & Pickle Ltd | Hospitality | 2019 |
| Cheetah Property Investments Ltd | Real estate | 2017 |
| Chelsea Harbour Coach House Limited | Construction | 2024 |
| Chelsea Harbour Construction Limited | Real estate | 2013 |
| Cherry Luxe Models Ltd | Administrative & support | 2025 |
| Chester Place Management Limited | Households | 2025 |
| Chesterton Grey Ltd | Professional & scientific | 2021 |
| Chichila Limited | Hospitality | 2011 |
| Chilbrook Limited | Financial services | 2025 |
| Chiron Ventures Limited | Other services | 2019 |
| Chocorose Factory Ltd | Manufacturing | 2019 |
| Chris Wade Aviation Ltd | Education | 2023 |
| Christie and Associates Limited | Administrative & support | 2018 |
| Christopher Floyd Photography Ltd | Professional & scientific | 2012 |
| Chronic Pictures Limited | Information & communication | 2022 |
| Chrysalis Investments Limited | Financial services | 2024 |
| Churchfields Avenue (Weybridge) Management Company Limited | Households | 2011 |
| Cielo 7 Ltd | Hospitality | 2026 |
| Cinemoves Int'L Limited | Transport & logistics | 2017 |
| Circuit Centre Brooklands Limited | Extraterritorial | 1994 |
| Circularity First Group Ltd | Financial services | 2020 |
| Circularity First Ltd | Information & communication | 2021 |
| Cistor Ltd | Wholesale & retail | 2007 |
| Citizen Seven Ltd | Other services | 2020 |
| City Camden Limited | Real estate | 2019 |
| City Corporate Estates Ltd | Construction | 2013 |
| City Crimscott Limited | Construction | 2018 |
| City DM Limited | Construction | 2018 |
| City Holdings London Ltd | Construction | 2012 |
| City Inc UK Limited | Construction | 2018 |
| City Pads Limited | Construction | 1997 |
| City Road Communications Limited | Administrative & support | 2000 |
| Cityscape Construction Limited | Construction | 2023 |
| CJ COX Property Ltd | Real estate | 2026 |
| CK Aviation Services Limited | Other services | 2020 |
| Claclac Limited | Professional & scientific | 2013 |
| Claire Bruce Design Ltd | Professional & scientific | 2013 |
| Claire Law & Co Limited | Wholesale & retail | 2026 |
| Claire Rebecca Interior Design Ltd | Professional & scientific | 2025 |
| Claire Totman Designs Ltd | Professional & scientific | 2023 |
| Claremont Bespoke Ltd | Construction | 2022 |
| Clarendon Training Ltd | Administrative & support | 2008 |
| Clarity HR Ltd | Information & communication | 2010 |
| Clarke and Co Accountancy/ Bookkeeping Services Limited | Professional & scientific | 2018 |
| Clarke Language Services Ltd | Professional & scientific | 2006 |
| Claude and IDA Ltd | Real estate | 2023 |