| Cheyne Court Management Limited | Households | 1989 |
| Chmc Engineering Solutions Ltd | Manufacturing | 2026 |
| Chronos E & U Limited | Administrative & support | 2011 |
| Chumley Properties Limited | Real estate | 2021 |
| Ciao Bella Productions Limited | Information & communication | 2013 |
| Cilldara Group (Ashfield) Limited | Real estate | 2021 |
| Cilldara Group (Baglan Bay) Limited | Real estate | 2023 |
| Cilldara Group (DRS) Ltd | Administrative & support | 2018 |
| Cilldara Group (Exeter) Ltd | Real estate | 2019 |
| Cilldara Group (Headington) Ltd | Real estate | 2021 |
| Cilldara Group (Holmes Chapel) Ltd | Real estate | 2020 |
| Cilldara Group (Portway) Ltd | Real estate | 2019 |
| Cilldara Group (Rainham) Ltd | Real estate | 2019 |
| Cilldara Group (Redhill RD) Ltd | Real estate | 2018 |
| Cilldara Group (Wilkes AVE) Ltd | Real estate | 2021 |
| Cilldara Group (Wythall Green) Limited | Real estate | 2024 |
| Cilldara Group Holdings Ltd | Financial services | 2019 |
| Circlesquare Marketing Solutions Ltd | Professional & scientific | 2011 |
| City Regeneration Limited | Construction | 2019 |
| Cladinstone Limited | Manufacturing | 2021 |
| Clark-Coates Event Management Limited | Professional & scientific | 2000 |
| Climatera Ltd | Professional & scientific | 2025 |
| Clogginns PUB Company Limited | Hospitality | 2014 |
| COLLAB8 Limited | Information & communication | 2008 |
| College Mews Management Limited | Households | 1983 |
| Coloini + Lane Architecture Limited | Professional & scientific | 2020 |
| Comm Lett UK Ltd | Arts & recreation | 2020 |
| Coneygre Redevelopments Limited | Real estate | 2018 |
| Connect Asset Consultancy Limited | Professional & scientific | 2022 |
| Connect Asset Management Limited | Real estate | 2014 |
| Cook Development Group Limited | Construction | 2024 |
| Corbally Developments Limited | Real estate | 1996 |
| Corbally Estates LLP | | 2008 |
| Corbally Group (Aviation) Limited | Wholesale & retail | 2014 |
| Corbally Group (Bescot) Limited | Real estate | 2009 |
| Corbally Group (Bordesley Hall) Limited | Real estate | 2012 |
| Corbally Group (Brantham 2) Limited | Real estate | 2016 |
| Corbally Group (Digbeth) Limited | Real estate | 2009 |
| Corbally Group (Edgbaston) Limited | Real estate | 2016 |
| Corbally Group (Finmere) Limited | Real estate | 2017 |
| Corbally Group (Garnett Road) Limited | Real estate | 2016 |
| Corbally Group (Harbury) Limited | Real estate | 2013 |
| Corbally Group (Knockanally) Limited | Real estate | 2016 |
| Corbally Group (Norton Lane) Limited | Real estate | 2007 |
| Corbally Group (Penlee) Limited | Real estate | 2012 |
| Corbally Group (Perry Barr) Limited | Real estate | 2014 |
| Corbally Group (Radway) Limited | Real estate | 2016 |
| Corbally Group (Tewkesbury) Limited | Real estate | 2012 |
| Corbally Holdings Limited | Real estate | 1973 |
| Corbally Properties Limited Partnership | | 2007 |
| Corbally Property Company Limited | Real estate | 2007 |
| Corbref Limited | Construction | 2021 |
| Core Partners Management Consultants Limited | Professional & scientific | 2006 |
| CORE62 Limited | Real estate | 2018 |
| Cotswold Gate (Moreton) Management Company Limited | Households | 2015 |
| Cotteridge Containers Ltd | Transport & logistics | 2026 |
| Cotterill Creative Education Solutions Limited | Professional & scientific | 2017 |
| CPS Midlands Property Holdings Ltd | Real estate | 2023 |
| Crabmill Ventures Ltd | Construction | 2024 |
| Crawford & Jaynes Organic Hairdressing Ltd | Other services | 2015 |
| Creative Campervan Conversions Ltd | Wholesale & retail | 2019 |
| Creativity and Commitment at Work Limited | Professional & scientific | 2016 |
| Curry Republic Arden Limited | Hospitality | 2023 |
| D T a Transportation Limited | Professional & scientific | 2004 |
| D T a Trustees Limited | Administrative & support | 2025 |
| D. V. Commercials Limited | Wholesale & retail | 1997 |
| D.Norman Paving & Landscaping Ltd | Administrative & support | 2018 |
| Daemon Consultancy Ltd | Professional & scientific | 2018 |
| Danaidae Limited | Professional & scientific | 2008 |
| DC & SON, Lapworth Limited | Real estate | 2020 |
| DCG Solutions Ltd | Professional & scientific | 2018 |
| DE Montfort Court Ltd | Real estate | 2008 |
| Deanfleet Limited | Real estate | 1996 |
| Deer's Leap Management Company Limited | Households | 2004 |
| Denton Wealth Management Limited | Professional & scientific | 2022 |
| Depotnet Ltd | Information & communication | 2011 |
| Design One Limited | Professional & scientific | 2012 |
| DGH (Bolsover) Limited | Real estate | 2012 |
| Diamond Construction Management Ltd | Construction | 2015 |
| Diamond Gate Ltd | Real estate | 2022 |
| Diamond Interior Designs Ltd | Wholesale & retail | 2023 |
| Dinoco Cruz Ltd | Information & communication | 2019 |
| Divine Connection Chapel London | Other services | 2009 |
| DMP Capital Limited | Other services | 2023 |
| Dolon (UK) Limited | Real estate | 2003 |
| DON Consultants Ltd | Construction | 2021 |
| Done for YOU Sales Agency Ltd | Administrative & support | 2024 |
| Dormar Builders Ltd | Construction | 2025 |
| Doyen Wines Limited | Hospitality | 2013 |
| Driveco Drives & Sons Ltd | Construction | 2024 |
| Driveco Driveways Limited | Construction | 2017 |
| DSA Consultants Limited | Construction | 2014 |
| DSM Civil Engineering Limited | Construction | 2008 |
| DSM Decommissioning Limited | Construction | 2016 |
| DSM Environmental Limited | Construction | 2008 |
| DSM Plant Limited | Construction | 2008 |
| DSM SFG Group Holdings Limited | Construction | 2017 |
| Dynamic Clinics UK Ltd | Health & social care | 2025 |
| Dynamic Modelling Services Limited | Information & communication | 2005 |
| E & E Property Limited | Real estate | 2016 |