| Complync Holdings Limited | Households | 2011 |
| Complync Limited | Information & communication | 2009 |
| Compo Matte Limited | Construction | 2025 |
| Comprobo Limited | Information & communication | 2012 |
| Comrisk Associates Ltd | Administrative & support | 2013 |
| Concept 2 Manufacture Design Limited | Other services | 2014 |
| Concept Care Staffing Limited | Administrative & support | 2021 |
| Concinnitas Ltd | Professional & scientific | 2022 |
| Concino Ltd | Wholesale & retail | 2022 |
| Condign Board Consulting Limited | Professional & scientific | 2011 |
| Condor Consulting and Coaching Ltd | Professional & scientific | 2023 |
| Conker Club Limited | Education | 2017 |
| Connaught Road Management Company Camberley (NO.2) Limited | Households | 2012 |
| Connector Global Ltd | Professional & scientific | 2024 |
| Connectstring Limited | Information & communication | 2023 |
| Connexa Global Limited | Professional & scientific | 2026 |
| Cononabel Limited | Administrative & support | 2025 |
| Conscious Carpentry Ltd | Construction | 2018 |
| Consequi Clothing Ltd | Wholesale & retail | 2023 |
| Conservatory Solutions South Ltd | Construction | 2020 |
| Consol Associates Ltd. | Professional & scientific | 2002 |
| Consol Holdings Ltd | Financial services | 2019 |
| Construction Business Ltd | Extraterritorial | 2012 |
| Consult Digital Limited | Professional & scientific | 2016 |
| Consultron Ltd | Wholesale & retail | 2021 |
| Contact 19 Limited | Wholesale & retail | 1993 |
| Contamination Control Network Ltd. | Other services | 2020 |
| Contemporary Paint Solutions Ltd | Other services | 2022 |
| Contract Nexus Limited | Professional & scientific | 2025 |
| Control Case Europe Limited | Professional & scientific | 2007 |
| Controlformal Property Management Limited | Households | 1997 |
| Converse Services Limited | Information & communication | 2015 |
| Cooksey Jones Recruitment Limited | Other services | 2018 |
| Coolmicro Limited | Real estate | 1997 |
| Cooptron Limited | Information & communication | 2024 |
| Copper Beech (Hook M.C.) Limited | Households | 2013 |
| Core Construction Ltd | Construction | 2020 |
| Core Leaders International Ltd | Professional & scientific | 2007 |
| Core Mortgages Limited | Financial services | 2007 |
| Corellia Properties Ltd | Real estate | 2024 |
| Corenet Systems Ltd | Information & communication | 2024 |
| Coreteq Limited | Professional & scientific | 2012 |
| Cornell Consulting Ltd | Information & communication | 2015 |
| Corner Green Residents Society Limited | Households | 1959 |
| Corner Keep Residents Association Limited | Households | 1978 |
| Corni & Crumble Limited | Hospitality | 2023 |
| Cornucopia I.T. Resourcing Limited | Administrative & support | 2006 |
| Coronas Consultancy Limited | Professional & scientific | 2019 |
| Corporate & Contract Furniture Services Ltd | Wholesale & retail | 2019 |
| Corporate Catalysts Limited | Professional & scientific | 2025 |
| Corporate Cleaning Company (Surrey) Limited | Administrative & support | 2004 |
| Corporate Finance Solutions Limited | Professional & scientific | 2001 |
| Corporate Secretary Subco 2 Limited | Extraterritorial | 2025 |
| Cortes and Seale Holdings Ltd | Real estate | 2021 |
| Cortona Consulting Limited | Administrative & support | 2023 |
| Cosmic Integrated Ltd | Construction | 2020 |
| Costa Transport Services Limited | Transport & logistics | 2017 |
| Cottingham Fletcher & Company Limited | Financial services | 2005 |
| Coudray Fields Management Company Limited | Households | 2020 |
| Counting Clouds Cambridgeshire Limited | Professional & scientific | 2019 |
| Court Gardens Freeholders Limited | Households | 2021 |
| Couture Hospitality & Training Ltd | Hospitality | 2025 |
| Coveney Lagden Solutions Limited | Professional & scientific | 2024 |
| Coventry Real Estate Ltd | Real estate | 2024 |
| Cover Direct Ltd | Financial services | 2016 |
| Coverad Limited | Manufacturing | 2013 |
| Coyte's Paddock Management Limited | Households | 2021 |
| Cozy Home Heating Ltd | Construction | 2008 |
| CP Electrical Solutions Ltd | Construction | 2019 |
| CP Liquidity Ltd | Financial services | 2025 |
| Cpayment Solutions Ltd | Financial services | 2020 |
| Cpresus Ltd | Education | 2026 |
| Cranbrook(Fleet)Residents Association Limited | Real estate | 1964 |
| Craneley Construction Ltd | Construction | 2015 |
| Craneley Properties Limited | Real estate | 2013 |
| Cranford Cottages Limited | Other services | 1987 |
| Cranmer Lodge Management Limited | Households | 1968 |
| Crash-Matt Stunts Ltd | Arts & recreation | 2022 |
| Craven Motor Club Limited(The) | Arts & recreation | 1961 |
| Crawley Down Road Residents Management Company Limited | Households | 2023 |
| Crawley Hill (Camberley) Management Company Limited | Households | 2011 |
| CRE8TIVE Rooms Ltd | Arts & recreation | 2001 |
| Cream Tangerine Ltd | Information & communication | 2023 |
| Create-This Limited | Administrative & support | 2007 |
| Creative Edge Ltd | Information & communication | 2022 |
| Creative Market Access Ltd | Professional & scientific | 2021 |
| Creative Style Limited | Other services | 1998 |
| Creative Words Ltd | Arts & recreation | 2017 |
| Cree Construction Limited | Construction | 2002 |
| Creed Gallery Holdings Ltd | Wholesale & retail | 2024 |
| Creed Gallery Ltd | Wholesale & retail | 2024 |
| Creed Rare Ltd | Wholesale & retail | 2025 |
| Creole Music Limited | Information & communication | 1964 |
| Crewdirect Limited | Transport & logistics | 2006 |
| CRH Dispute Resolution Services Limited | Administrative & support | 2017 |
| Cricketers Close (Bagshot) Management Company Ltd | Real estate | 2020 |
| Crimson Lake Limited | Information & communication | 2004 |
| Cristofaro Limited | Real estate | 2012 |
| Cristofaro Management Ltd | Professional & scientific | 2020 |
| Croft Homes (Bentley) Ltd | Construction | 2007 |