| Count Count Limited | Other services | 2020 |
| Countrymart Ltd | Wholesale & retail | 2010 |
| County House Residents Society Limited | Households | 1981 |
| Court Oak Local Limited | Wholesale & retail | 2018 |
| Courtauld Place (Braintree) Management Company Limited | Households | 2014 |
| Courtlands House Limited | Households | 2011 |
| Courtlands House RTM Company Limited | Households | 2009 |
| Courtlands Way Management Company Limited | Households | 1993 |
| Courtlands West Freehold Company Limited | Households | 1997 |
| Courtyard (the Atrium) Management Limited | Households | 2008 |
| Courtyard Services Limited | Financial services | 2022 |
| Couscous Media Ltd | Information & communication | 2022 |
| Couverté Ltd | Manufacturing | 2024 |
| Covebuild Ltd | Professional & scientific | 2024 |
| Covent Gardens (Colwall) Management Company Limited | Households | 2011 |
| Cover-All Limited | Other services | 2016 |
| Coverall Cleaning Services Ltd | Administrative & support | 2024 |
| Covermaster Systems Limited | Extraterritorial | 2005 |
| Covert Group Ltd | Administrative & support | 2018 |
| Cowper Avenue Limited | Real estate | 2005 |
| Cozic Ltd | Information & communication | 2008 |
| CP Property Consultancy Ltd | Real estate | 2021 |
| CPC Direct Training Limited | Education | 2016 |
| CPI Antony Rowe Ltd | Manufacturing | 1993 |
| CPI Books Ltd | Manufacturing | 1987 |
| CPI Colour Ltd | Manufacturing | 1971 |
| CPI Group (UK) Ltd | Professional & scientific | 2005 |
| CPI William Clowes Ltd | Manufacturing | 1997 |
| Cppr Property Limited | Construction | 2004 |
| Cqra Ltd | Households | 2012 |
| Cqraff Solutions Ltd | Professional & scientific | 2025 |
| CR Chauffeur Ltd | Transport & logistics | 2022 |
| CR Plumbing & Boiler Services Limited | Construction | 2026 |
| CR Tiling Services and Building Maintenance Limited | Construction | 2026 |
| CR0 High Street Kebab Ltd | Hospitality | 2025 |
| CR0 Mobiles and Electronics Limited | Manufacturing | 2021 |
| CR1 Limited | Administrative & support | 2023 |
| CR1 Matrix Ltd | Wholesale & retail | 2026 |
| CR34 Holdings Ltd | Hospitality | 2018 |
| CR8 Three Limited | Real estate | 2019 |
| Crab Ltd | Information & communication | 2026 |
| Crabbit Limited | Financial services | 2024 |
| Cradge Bank Property Company Limited | Households | 2019 |
| Cradlecrest Limited | Wholesale & retail | 1982 |
| Cradlefield Limited | Extraterritorial | 2010 |
| Craftx Wear Ltd | Wholesale & retail | 2025 |
| Craig a. Brown Consultancy Limited | Professional & scientific | 2024 |
| Craig Linton Fundraising Services Limited | Professional & scientific | 2015 |
| Craigail Limited | Professional & scientific | 2014 |
| Craignair Court Management Company Limited | Households | 1983 |
| Craigwilliams Ltd | Construction | 2025 |
| Crambeth Allen Publishing Ltd | Information & communication | 2003 |
| Cramer Court Residents Company Limited | Households | 1996 |
| Cranberry Gardens (Congleton) Management Company Limited | Households | 2017 |
| Crane & Construction Solutions Limited | Construction | 2014 |
| Cranford House Management Limited | Households | 1988 |
| Cranford Square Residents Association Limited | Households | 1997 |
| Cranleigh Nursery Limited | Real estate | 2003 |
| Cranmore Flat Management Company Limited | Households | 1977 |
| Crash Repairs.Co.Uk Limited | Wholesale & retail | 2005 |
| Craureas Ltd | Wholesale & retail | 2022 |
| Crawley Bedsits Limited | Real estate | 2016 |
| Crawley Rise Management Company Limited | Households | 2003 |
| Crawshays RTM Company Limited | Households | 2023 |
| Cray Valley Solicitors Limited | Professional & scientific | 2004 |
| Crazy for Coffee Ltd | Hospitality | 2016 |
| Crazy for Pizza Ltd | Hospitality | 2022 |
| Crazyforpasta Ltd | Hospitality | 2014 |
| CRB Contractors Limited | Construction | 2004 |
| CRC EDU Limited | Administrative & support | 2026 |
| Crcm Cares Ltd | Public administration | 2021 |
| CRE8 Football Academy Limited | Education | 2015 |
| CRE8TIVE Concepts Limited | Construction | 2021 |
| Creating Rules Ltd | Wholesale & retail | 2022 |
| Creation Managed Services Ltd | Information & communication | 2020 |
| Creations Digital Limited | Information & communication | 2024 |
| Creations Mobile Tyres Limited | Wholesale & retail | 2024 |
| Creations of Beauty Ltd | Other services | 2017 |
| Creative Brothers Ltd | Manufacturing | 2025 |
| Creative Croydon C.I.C. | Health & social care | 2015 |
| Creative Distribution Limited | Wholesale & retail | 2003 |
| Creative Distribution Promotions Ltd | Wholesale & retail | 2016 |
| Creative Finish Body Works Limited | Manufacturing | 2024 |
| Creative Independent Living Limited | Health & social care | 2020 |
| Creative Interiors London Limited | Manufacturing | 2003 |
| Creative Lead Ltd | Professional & scientific | 2016 |
| Creative Learning Circuit Limited | Arts & recreation | 2009 |
| Creative Minority Limited | Information & communication | 2014 |
| Creative Property Management Limited | Real estate | 2023 |
| Creative Soul Limited | Professional & scientific | 2007 |
| Creative Vixstory Limited | Information & communication | 2016 |
| Creatorist Limited | Information & communication | 2026 |
| Credo.Io Ltd | Professional & scientific | 2026 |
| Credostyl Ltd | Construction | 2025 |
| Creek Spur Limited | Hospitality | 2022 |
| Crescent Court Limited | Households | 2016 |
| Crescent Mews Company Limited | Households | 1996 |
| Crescent Park Maintenance Limited | Households | 1967 |
| Crescent West (Ashford) Management Company Limited | Households | 2016 |
| Cressington Heath Management Company Limited | Households | 2006 |