| Camilla LE MAY Limited | Arts & recreation | 2010 |
| Camisky Consulting Ltd | Real estate | 2022 |
| Camrosa Equestrian Limited | Wholesale & retail | 1989 |
| Caravan Insurance Services Limited | Financial services | 2001 |
| Carl G Douglas Limited | Transport & logistics | 2009 |
| Carpe Diem Management | Financial services | 2017 |
| Castle Classic Cars Limited | Wholesale & retail | 2012 |
| Castle Park Management Company Limited | Real estate | 1989 |
| Castle Walk Limited | Households | 1980 |
| Catalyst Management Consultants Limited | Professional & scientific | 2020 |
| Cathedral (Clapham) Limited | Administrative & support | 2007 |
| Cathedral ST Leonard's Church Limited | Real estate | 2023 |
| Cawsey Ltd | Extraterritorial | 2022 |
| Cedar Cleaning and Support Services Ltd | Administrative & support | 2005 |
| Cellar Wadhurst Ltd | Wholesale & retail | 2024 |
| Centre for Research in Employment and Technology in Europe Limited | Professional & scientific | 1988 |
| Centum Milia Ltd | Information & communication | 2017 |
| CG Woodchester Right to Manage Company Limited | Households | 2025 |
| CG Wychwood Right to Manage Company Limited | Households | 2025 |
| Chaddlewood House RTM Company Limited | Households | 2025 |
| Change Hospitality (Group) Ltd | Administrative & support | 2020 |
| Change Hospitality (London) Ltd | Administrative & support | 2026 |
| Change Hospitality (Manchester) Ltd | Administrative & support | 2026 |
| Chantry Residential Management (One) Limited | Households | 2006 |
| Charles Century Estate Agents Limited | Real estate | 2023 |
| Charles Century Hailsham Estate Agents Ltd | Real estate | 2024 |
| Charles Century Lettings Estate Agents Ltd | Real estate | 2025 |
| Chart Land Ltd | Real estate | 2019 |
| Chillio Ltd. | Other services | 2017 |
| Churchill House RTM Company Limited | Households | 2025 |
| CJK Maritime Ltd | Professional & scientific | 2024 |
| Clare House (Hampshire) RTM Company Limited | Households | 2023 |
| Clarity First Solutions Limited | Agriculture & fishing | 2020 |
| Classic-Charters.Com Ltd | Administrative & support | 2008 |
| Cleaning Concierge Solutions Ltd | Administrative & support | 2025 |
| Cliftonville Eyecare Ltd | Wholesale & retail | 2022 |
| CLP Live Limited | Professional & scientific | 2017 |
| CMH Travel Limited | Administrative & support | 2012 |
| CMR Jackdaw Limited | Administrative & support | 2007 |
| Coast Credit Limited | Financial services | 2023 |
| Coast Insurance Limited | Financial services | 2010 |
| Coast Insurance Services Limited | Financial services | 2010 |
| College Court (Brighton) RTM Company Limited | Households | 2024 |
| Colston Homes Limited | Construction | 1997 |
| Comet Coffee Ltd | Manufacturing | 2025 |
| Commercialist Limited | Professional & scientific | 2010 |
| Commonside RTM Company Limited | Households | 2023 |
| Compass Career Opportunities Limited | Information & communication | 1991 |
| Compass Comms Limited | Information & communication | 2016 |
| Compliance Solutions Service Limited | Professional & scientific | 2023 |
| Conker and Stone Ltd | Professional & scientific | 2024 |
| Construction & Safety Signs Limited | Manufacturing | 1991 |
| Core Risks Limited | Financial services | 2024 |
| Corex Enterprises Limited | Wholesale & retail | 2004 |
| Cork Street Asset Management Ltd | Real estate | 2025 |
| Cozyflow Ltd | Professional & scientific | 2025 |
| CPH Property Holdings Limited | Real estate | 2023 |
| CQM Associates Limited | Professional & scientific | 2015 |
| Crabtree & Crabtree (Wadebridge) Limited | Real estate | 2014 |
| Craigs C H RTM Company Limited | Households | 2026 |
| Crest House RTM Company Limited | Households | 2026 |
| Cresta Court D RTM Company Limited | Households | 2021 |
| Cresta Court E RTM Company Limited | Households | 2021 |
| Cresta Court F RTM Company Limited | Households | 2021 |
| Cribbar RTM Company Limited | Households | 2025 |
| CSC Communications Limited | Information & communication | 1989 |
| Cube Developments & Construction Limited | Construction | 2009 |
| Cullawn Construction Limited | Construction | 2013 |
| D. York Freehold Limited | Households | 2018 |
| Darkerthanblue UK Limited | Extraterritorial | 2001 |
| David Barden Creative Ltd | Professional & scientific | 2015 |
| David Rattray Violins Limited | Manufacturing | 2011 |
| Davis Place Management Company Limited | Households | 2023 |
| DDL71 (RTE) Limited | Professional & scientific | 2008 |
| Deborah Jarrett Consultancy Limited | Professional & scientific | 2022 |
| DEC (HB UK) Limited | Professional & scientific | 2018 |
| Delamere Bespoke Interiors Ltd | Manufacturing | 2020 |
| Delphinium Partners Limited | Administrative & support | 2009 |
| Delta-P Ltd | Wholesale & retail | 2019 |
| Denton W5 RTM Ltd | Households | 2025 |
| Dermabalance Ltd | Other services | 2025 |
| DND Tech Ltd | Administrative & support | 2025 |
| Donbros Securities Limited | Financial services | 2017 |
| Dosa Holdings Ltd | Administrative & support | 2023 |
| Downash Farm Limited | Real estate | 1999 |
| DPS Direct Ltd | Information & communication | 2024 |
| Dragon Metals Limited | Professional & scientific | 2025 |
| Drake CS Limited | Professional & scientific | 2018 |
| Drambor Consulting Ltd | Professional & scientific | 2013 |
| DRD Illuminations Ltd | Professional & scientific | 2018 |
| Driftwood Barns & Construction Services Limited | Construction | 2018 |
| Dunnett Productions Limited | Administrative & support | 2018 |
| Durgates Industrial Estate Limited | Real estate | 1986 |
| Dynamic Groundworks Limited | Construction | 2017 |
| Dyno Residential Ltd | Real estate | 2023 |
| E-J Boutwood Limited | Information & communication | 2010 |
| Eaglehand Limited | Information & communication | 2014 |
| East Hoathly Village Stores Limited | Wholesale & retail | 2010 |
| Eden Court (Ticehurst) Management Company Limited | Real estate | 2006 |
| Edsantos Ltd | Wholesale & retail | 2022 |