| City Gate Management Company (Oxford) Limited | Households | 2007 |
| Clarendon Court Management Company Limited | Households | 1982 |
| Clifton Close (Bicester) Management Company Limited | Households | 2018 |
| Cloudflix Ltd | Information & communication | 2021 |
| Clpm Limited | Construction | 2014 |
| CMC Coins & Collectables Limited | Wholesale & retail | 2023 |
| CMH3 Limited | Professional & scientific | 2022 |
| Cmss | Other services | 1978 |
| Cocofina Ltd | Hospitality | 2010 |
| Code Aquarius Limited | Information & communication | 2024 |
| Coed Y Felin Management Company (New Inn) Limited | Households | 2013 |
| Collectables R US Ltd | Wholesale & retail | 2014 |
| College View (Dewsbury) Management Company Limited | Households | 2007 |
| Collingwood Court (Folkestone) Limited | Construction | 1999 |
| Colosseum Catering Equipment Limited | Wholesale & retail | 2002 |
| Colosseum Estates Ltd | Real estate | 2021 |
| Colourpoint Group Limited | Manufacturing | 2021 |
| Comland Co 1 Limited | Extraterritorial | 2018 |
| Comland Co 2 Limited | Extraterritorial | 2018 |
| Comland Commercial Estates Limited | Real estate | 1988 |
| Comland Commercial Limited | Real estate | 1997 |
| Comland Group Limited | Professional & scientific | 2007 |
| Comland Holdings Limited | Financial services | 2000 |
| Comland Industrial and Commercial Properties Limited | Extraterritorial | 1987 |
| Comland Industrial Limited | Construction | 2002 |
| Comland Leisure Limited | Financial services | 2007 |
| Comland Liston Exchange Limited | Real estate | 2002 |
| Comland Management Limited | Real estate | 2001 |
| Comland Parade Court Limited | Real estate | 2003 |
| Comland Prospect House Limited | Real estate | 2002 |
| Comland Regatta Place Limited | Real estate | 2002 |
| Comland Ringlead Limited | Real estate | 2005 |
| Comland Wessex Limited | Financial services | 2014 |
| Comland Wethered House Limited | Real estate | 2002 |
| Communication Devices International Ltd | Information & communication | 2008 |
| Compass Point (Sandbanks) Limited | Households | 1991 |
| Convirgint Limited | Information & communication | 2006 |
| Cool Concept Limited | Construction | 2001 |
| Coolhurst 1 Ltd | Construction | 2019 |
| Coolzone Ltd | Extraterritorial | 2020 |
| Cooper Ecommerce Ltd | Wholesale & retail | 2025 |
| Coopers Trading Company Limited | Manufacturing | 2013 |
| Copperbeech Court (Poole) Management Company Limited | Households | 2001 |
| Coremaker Group Ltd | Financial services | 2023 |
| Coremaker Limited | Administrative & support | 2017 |
| Cores END Management Company Limited | Households | 1984 |
| Corsham Court Estate Management Limited | Real estate | 2021 |
| Costarey Ltd | Real estate | 2024 |
| Countywide Heating & Plumbing Services Ltd | Construction | 2026 |
| Crabton RTM Limited | Households | 2004 |
| Cracknell Bracey International Search Limited | Administrative & support | 2012 |
| Cracknells Hairdressing Limited | Administrative & support | 2005 |
| Craft Nest Properties Ltd | Real estate | 2023 |
| Craig Trading (NO 6) Ltd | Administrative & support | 2008 |
| Creative Image Nominees Limited | Financial services | 2022 |
| Creative Image Services Ltd | Professional & scientific | 2022 |
| Cressco Corporate Clothing Ltd | Wholesale & retail | 2009 |
| Cressex Close (High Wycombe) Management Company Limited | Households | 2008 |
| Crmcrew Limited | Information & communication | 2020 |
| Crooks Clothing Company Ltd | Wholesale & retail | 2025 |
| Crosslands Management Limited | Households | 2011 |
| Crossley Family Holdings Limited | Financial services | 2024 |
| CT Alliance Limited | Professional & scientific | 2017 |
| Culbone Investment Ltd | Real estate | 2016 |
| Culbone Ltd | Professional & scientific | 2001 |
| Cumberland & King (Developments) Ltd | Construction | 2009 |
| Curated Communication Limited | Professional & scientific | 2025 |
| Cwrt Penrhwityn 2 Management Company Limited | Extraterritorial | 2006 |
| D a Baker Limited | Construction | 2021 |
| D a Ward Bespoke Limited | Construction | 2021 |
| D. Mckillop Consultants Limited | Information & communication | 1998 |
| Daisy Hill (Bradford) Management Company Limited | Households | 2004 |
| Daisy Tent Ltd | Other services | 2024 |
| DAK DAK Ltd | Real estate | 2024 |
| Dark Angels Writers Limited | Education | 2017 |
| Darwin IP Limited | Professional & scientific | 2011 |
| Dataeng Ltd | Professional & scientific | 2008 |
| Dataholix Ltd | Information & communication | 2020 |
| Davies White Ltd | Professional & scientific | 2009 |
| Davinder Toor Limited | Wholesale & retail | 2011 |
| Day Associates (Bucks) Ltd | Real estate | 2020 |
| Deaconstruction (UK) Limited | Construction | 2001 |
| Debbie Eaton Case Management Limited | Health & social care | 2009 |
| Defi Financial Services Limited | Professional & scientific | 2020 |
| Definitely Maybe Bar Limited | Hospitality | 2020 |
| Degrees of Comfort Limited | Construction | 2006 |
| Dellswood Properties Ltd | Real estate | 2024 |
| Denmark Court (Wokingham) Limited | Real estate | 2002 |
| Dialog Semiconductor Holdings 1 Limited | Professional & scientific | 2016 |
| Dialog Semiconductor Limited | Professional & scientific | 1998 |
| Dickman Properties Limited | Real estate | 2021 |
| Differing Properties Limited | Real estate | 2007 |
| Discount Shoe Sales Limited | Wholesale & retail | 2003 |
| Ditto Digital Limited | Information & communication | 2003 |
| Diverset Limited | Professional & scientific | 1999 |
| Dixon's Wharf (Tring) Management Company Limited | Households | 2013 |
| Dixons Landscapes Limited | Construction | 2014 |
| Dixwell House Management Company Limited | Extraterritorial | 2005 |
| Dluna Limited | Manufacturing | 2025 |
| DOC Building Facilities Ltd | Construction | 2005 |