| Cerys Macaulay Eventing Ltd | Agriculture & fishing | 2024 |
| Cfmg Construction Ltd | Construction | 2023 |
| Cgibson Construction Ltd | Construction | 2026 |
| CGV Consulting Limited | Professional & scientific | 2024 |
| Chahana Limited | Hospitality | 2022 |
| Chamberlain Medical Solutions Ltd | Health & social care | 2024 |
| Chambers Enterprises Limited | Hospitality | 2007 |
| Chanco Ltd | Transport & logistics | 2022 |
| Chandlers (Farm Vehicles) Limited | Wholesale & retail | 2020 |
| Chandlers (Mechanised Farming) Limited | Wholesale & retail | 2020 |
| Chapel House Ventures Ltd | Professional & scientific | 2021 |
| Charisma Services Limited | Health & social care | 2020 |
| Charles Boyfield Ltd | Construction | 2012 |
| Charlie Bravo Ltd | Construction | 2022 |
| Charlotte Organ Limited | Professional & scientific | 2025 |
| Charterhouse Knight Limited | Professional & scientific | 2010 |
| Chartwell House Developments Limited | Real estate | 2014 |
| Chauffeur V.I.P Limited | Transport & logistics | 2012 |
| Cheers Chicken Ltd | Hospitality | 2024 |
| Cherizena of Ashby Limited | Wholesale & retail | 2019 |
| Cherrytrees Consultancy Ltd | Professional & scientific | 2023 |
| Cheshire-Snowden Properties Ltd | Real estate | 2024 |
| Chestnut Grange (Barrowby) Management Company Limited | Households | 2018 |
| Chestnut Regulatory Consultancy Ltd | Professional & scientific | 2025 |
| Chicken Pelace Ltd | Hospitality | 2018 |
| Chicken Shed Joinery Ltd | Manufacturing | 2024 |
| Chilcotin Limited | Financial services | 2010 |
| Chillingsworth Associates Limited | Professional & scientific | 2003 |
| Chipola Limited | Financial services | 2013 |
| Chloe Jonason & Co Ltd | Construction | 2024 |
| Chough Limited | Financial services | 2012 |
| Chris Duffy (UK) LLP | | 2007 |
| Chris Ward Carpets and Flooring Limited | Construction | 2013 |
| Church Acre Limited | Financial services | 1997 |
| Cinamon Girl Limited | Administrative & support | 2015 |
| Civerh Ltd | Transport & logistics | 2020 |
| CJP Property Group Ltd | Real estate | 2025 |
| Clare L Newton Limited | Professional & scientific | 2022 |
| Clare Newton ADR & Mediation Services Limited | Professional & scientific | 2025 |
| Clares of Grantham Ltd | Other services | 2020 |
| Claridge Partners Limited | Financial services | 2012 |
| Clarity Systems Ltd | Information & communication | 2020 |
| Clark Machinery Ltd | Administrative & support | 2022 |
| Clarricoates Equestrian LLP | | 2019 |
| Classic Carp Limited | Arts & recreation | 2014 |
| Classic Road & Rally Limited | Wholesale & retail | 2011 |
| Claudius Debt Purchase Limited | Extraterritorial | 2026 |
| Claytons Auto Repair Ltd | Wholesale & retail | 2020 |
| Clean and Tidy (Grantham) Ltd | Administrative & support | 2024 |
| Clearpath Vehicle Transport Limited | Transport & logistics | 2026 |
| Clint Properties LLP | | 2009 |
| Clockwork Marketing & Events Limited | Professional & scientific | 2004 |
| Clothing Look Limited | Wholesale & retail | 2024 |
| Cloud Endeavours Enterprise Solutions Limited | Information & communication | 2015 |
| Cloud Security Solutions Ltd | Information & communication | 2014 |
| Clover Rose Limited | Financial services | 2024 |
| CLP HOMES4U Ltd | Real estate | 2021 |
| CMB Plant Training Ltd | Administrative & support | 2024 |
| Cmetrix Ltd | Information & communication | 2008 |
| CMP Property Solutions Limited | Real estate | 2023 |
| CNG Motors Ltd | Wholesale & retail | 2022 |
| Coaching for Diversity Ltd | Professional & scientific | 2020 |
| Coatsworth Joinery Ltd | Construction | 2023 |
| Cobaka Ltd | Construction | 2025 |
| Cocktail Companion Limited | Information & communication | 2016 |
| Cognitive Capital Advisory Ltd | Professional & scientific | 2026 |
| Cohen & England Ltd | Agriculture & fishing | 2022 |
| Coles Heritage Place Renewal Limited | Professional & scientific | 2022 |
| Colin Gray Services Ltd | Other services | 2019 |
| Colin Weightman Services Limited | Manufacturing | 2002 |
| Colsterworth Commercials Limited | Wholesale & retail | 2020 |
| Comilla Underwriting Limited | Financial services | 2009 |
| Commercial Finance Associates Limited | Financial services | 2006 |
| Commercial List Ltd | Real estate | 2022 |
| Community Books Limited | Wholesale & retail | 2016 |
| Compass Business Consultants Ltd | Professional & scientific | 2013 |
| Complete Hospitality Ltd | Professional & scientific | 2019 |
| Concorde Assets Limited | Real estate | 2005 |
| Coniston NO 101 LLP | | 2006 |
| Connected Fleet Limited | Information & communication | 2022 |
| Conquistador Sailing Ltd | Transport & logistics | 2018 |
| Construction Contractors UK Ltd | Construction | 2023 |
| Contour Specialist Fabrics Limited | Wholesale & retail | 2012 |
| Cooke and Burns (Personnel Services) Limited | Professional & scientific | 1978 |
| Cool Farm Alliance Community Interest Company | Information & communication | 2014 |
| Coorie Wild Limited | Professional & scientific | 2024 |
| Coppcliffe Lets Limited | Hospitality | 2025 |
| Copper FLY Ltd | Manufacturing | 2024 |
| Copthill Holdings Limited | Financial services | 2001 |
| Copthill School Limited | Education | 1997 |
| Coral James Estate Agents Limited | Real estate | 2017 |
| Corby Glen Car Storage Ltd | Real estate | 2024 |
| Cordelia Trading Limited | Real estate | 2012 |
| Correco Limited | Administrative & support | 2005 |
| Countryside Recreational Access Group Limited | Other services | 2005 |
| Countrywide Utilities Limited | Professional & scientific | 2017 |
| Court Leys Farm Ltd | Real estate | 2025 |
| Couture Cases Ltd | Manufacturing | 2011 |
| Covell Technical Services Ltd | Manufacturing | 2024 |
| Covent Garden Investment Properties Limited | Real estate | 2023 |