| Clearance Golf Retailers Ltd | Wholesale & retail | 2025 |
| Clearwater Retail Ltd | Information & communication | 2010 |
| Clegghorn Gallant Property Development Limited | Construction | 2004 |
| CLH Luxury Travel Limited | Administrative & support | 2025 |
| Cliques Management Ltd | Professional & scientific | 2023 |
| Cliques Mentoring Ltd | Education | 2024 |
| CLK Communications and Copywriting Services Limited | Professional & scientific | 2023 |
| Cloudshift Limited | Information & communication | 2012 |
| Clover of Reigate Ltd | Real estate | 1980 |
| Club Journeyman TH Limited | Wholesale & retail | 2017 |
| Club Rally Ltd | Manufacturing | 2025 |
| CM19 Commercial Limited | Real estate | 2024 |
| CM19 Residential Limited | Real estate | 2024 |
| CMK Construction Ltd | Construction | 2022 |
| Codenest Estate Ltd | Real estate | 2018 |
| Codenest Ltd | Information & communication | 2017 |
| Codes Property Limited | Real estate | 2021 |
| Codon Limited | Information & communication | 2025 |
| Coesite Limited | Real estate | 2018 |
| Cogmans Lane Woodland Limited | Real estate | 2024 |
| Cognitive Therapy Consultancy Ltd | Health & social care | 2008 |
| Cohasset Management Limited | Professional & scientific | 2016 |
| Colclough-Tsang Media Limited | Arts & recreation | 2018 |
| Colley Developments Limited | Construction | 2017 |
| Colley Way Road Management Limited | Households | 2018 |
| Comedy Beats Ltd | Arts & recreation | 2015 |
| Commonwealth Boxing Council Limited | Arts & recreation | 1997 |
| Company Secretarial UK Ltd | Professional & scientific | 2025 |
| Company Tax Ltd | Professional & scientific | 2025 |
| Compass Business Partners Limited | Professional & scientific | 2001 |
| Competex Limited | Professional & scientific | 1984 |
| Complex Systems Engineering Ltd | Information & communication | 2003 |
| Compton Real Estate Limited | Real estate | 2024 |
| Comtec Enterprises Limited | Information & communication | 1999 |
| Comtec Power Limited | Information & communication | 1998 |
| Concept Developments (Billingshurst) Ltd | Construction | 2015 |
| Concept Estate Planning Ltd | Financial services | 2021 |
| Concept Financial Planning Ltd | Financial services | 2007 |
| Concept Fleet Solutions Limited | Administrative & support | 2019 |
| Concept Flexidrive Limited | Administrative & support | 2019 |
| Concert Pitch Digital Ltd | Information & communication | 2023 |
| Conduct Engineering Limited | Construction | 2009 |
| Connect (Medico-Legal) Limited | Professional & scientific | 2004 |
| Connick Tree Care (Brighton) Limited | Extraterritorial | 2003 |
| Connick Tree Care (Reigate) Limited | Extraterritorial | 2003 |
| Connick Tree Care Trustees Limited | Administrative & support | 2023 |
| Connick Tree Consultants Limited | Administrative & support | 2000 |
| Connick Tree Services Limited | Agriculture & fishing | 2003 |
| Connor Jones Limited | Professional & scientific | 2018 |
| Conqueror’S Gate (Battle) Management Company Limited | Households | 2026 |
| Conscious Dreams Publishing Limited | Information & communication | 2015 |
| Consiliario Confidebat Consulting Limited | Information & communication | 2018 |
| Construction & Property Consultants Limited | Professional & scientific | 2002 |
| Consult 7 Books Limited | Professional & scientific | 2012 |
| Consult 7 Limited | Professional & scientific | 2008 |
| Contact Law (UK) Limited | Information & communication | 2019 |
| Continuate Digital Consulting Group Ltd | Professional & scientific | 2021 |
| Conundrumgifts Ltd | Wholesale & retail | 2025 |
| Cook Construction Development Ltd | Construction | 2025 |
| Cookiedolicious Ltd | Manufacturing | 2018 |
| Coombs Health Care Limited | Health & social care | 2004 |
| Copperfield Lant Ltd | Households | 2024 |
| Copperfield Properties Limited | Real estate | 2004 |
| Copthall Estates Limited | Real estate | 2020 |
| Copthorne Business Park Limited | Real estate | 2006 |
| Corinnes Coffee Shop Ltd | Wholesale & retail | 2022 |
| Cornwall and Co Consulting Ltd | Professional & scientific | 2013 |
| Corporate Facilities Management Limited | Administrative & support | 2018 |
| Corporate Facilities Services Limited | Administrative & support | 1997 |
| Cortaflex Limited | Professional & scientific | 2001 |
| Corvex Group Limited | Real estate | 2022 |
| Cotopaxi Consulting Ltd | Professional & scientific | 2020 |
| Cottons Commercial Cleaning Company Limited | Administrative & support | 2025 |
| Couling Limited | Construction | 2010 |
| Counselling Solutions Ltd | Administrative & support | 1998 |
| Couture Shop Limited | Wholesale & retail | 2018 |
| Cove Catering & Leisure Limited | Hospitality | 2005 |
| Coveney Nicholls Partnership LLP | | 2013 |
| Covey Developments Limited | Wholesale & retail | 2001 |
| CP IR Ltd | Professional & scientific | 2020 |
| CPR Controls Ltd | Construction | 2021 |
| CQA Consulting Limited | Administrative & support | 2006 |
| CR Four Freehold Limited | Construction | 2018 |
| CR Global Trading Ltd | Wholesale & retail | 2022 |
| Crafted Gardens Ltd | Administrative & support | 2019 |
| Craftsman Plus Limited | Information & communication | 2021 |
| Cragoe Property Limited | Extraterritorial | 2005 |
| Cranbourne Property Consultants Limited | Real estate | 2020 |
| Crate Jacobs Limited | Professional & scientific | 2025 |
| Crawley Apartments Ltd | Real estate | 2017 |
| Crea 1 GP Limited | Financial services | 2022 |
| Create Leaps Ltd | Professional & scientific | 2014 |
| Create.Select Limited | Administrative & support | 2011 |
| Creations Building and Landscaping Ltd | Construction | 2019 |
| Creative Culture Limited | Administrative & support | 2008 |
| Creative Minds International Limited | Professional & scientific | 2007 |
| Creative Temple Limited | Professional & scientific | 2025 |
| Creative Vision Promotions Limited | Administrative & support | 2001 |
| Creed Housing LLP | | 2017 |
| Creed Housing Projects Ltd. | Real estate | 2016 |