| Cerno Thames Ltd | Professional & scientific | 2023 |
| CFO IQ UK Ltd | Professional & scientific | 2025 |
| CFT Maritime Limited | Transport & logistics | 2026 |
| CG Consulting Solutions Limited | Information & communication | 2017 |
| CGS Global Ltd | Wholesale & retail | 2019 |
| Chai Nashta Limited | Hospitality | 2025 |
| Chaldon Hill Limited | Professional & scientific | 2021 |
| Chalemonte Limited | Wholesale & retail | 2024 |
| Chalk and Cheese Events Limited | Hospitality | 2022 |
| Chama Group Ltd | Hospitality | 2026 |
| Chambers on the Hill Limited | Professional & scientific | 2016 |
| Chameleon (Ockley) Limited | Financial services | 2019 |
| Chameleon Kingston Limited | Other services | 2013 |
| Chandaninc Ltd | Professional & scientific | 2024 |
| Chapel ASH Consultancy Ltd | Information & communication | 2019 |
| Chapman Burrell Ltd | Administrative & support | 2012 |
| Chappell Sports Cars Ltd | Wholesale & retail | 2010 |
| Chapter 5 Consulting Ltd | Professional & scientific | 2022 |
| Charapita Limited | Wholesale & retail | 2021 |
| Charbel Food Limited | Hospitality | 2019 |
| Charing Cross Exhibitions Ltd | Arts & recreation | 2019 |
| Charing TN27 Limited | Real estate | 2013 |
| Charlemont House Management Company Limited | Households | 2007 |
| Charles II Place Management (1991) Limited | Real estate | 1991 |
| Charleville Management Ltd | Professional & scientific | 2002 |
| Charlie Chandler's Guitar Experience Limited | Wholesale & retail | 2003 |
| Charter Business Administration Limited | Administrative & support | 2022 |
| Chartfield Construction Limited | Real estate | 1999 |
| Chatsworth House (Residents' Association) Limited | Households | 1997 |
| Chaugain Estate Ltd | Real estate | 2021 |
| Chauhan-Patel Consulting Limited | Professional & scientific | 2022 |
| Chef Alyssia Ltd | Hospitality | 2025 |
| Chef Reilly London Ltd | Hospitality | 2024 |
| Chelsea FG Ltd | Real estate | 2025 |
| Chelsea Studios Limited | Real estate | 2004 |
| Chelsfield Capital Management Ltd | Real estate | 2026 |
| Chelston Court (Surbiton) Ltd | Households | 2019 |
| Cherian Properties Ltd | Real estate | 2022 |
| Cherry Gardens Residents Management Company Limited | Households | 2024 |
| Chertsey Elevators Limited | Construction | 2002 |
| Cherubond Limited | Construction | 1981 |
| Chesney Court Limited | Real estate | 1996 |
| Chest Management Limited | Households | 2024 |
| Chestnut Professional Limited | Professional & scientific | 2007 |
| Chetterwood Limited | Households | 1973 |
| Chia Chickens Ltd | Real estate | 2024 |
| Chiabiz Ltd | Professional & scientific | 2025 |
| Chic O Land Food Ltd | Hospitality | 2022 |
| Chick Lounge Ltd | Hospitality | 2022 |
| Chickde Home Ltd | Wholesale & retail | 2019 |
| Chicory Kitchen Limited | Hospitality | 2015 |
| CHIL7 Ltd | Information & communication | 2024 |
| Children With Tumours Ltd | Health & social care | 2015 |
| Childrive Ltd | Other services | 2016 |
| Chinnor Hill Ltd | Real estate | 2026 |
| Chipsy Ltd | Hospitality | 2016 |
| Chiro Life Limited | Health & social care | 2011 |
| Chocolate Box Studios Ltd | Information & communication | 2014 |
| Chopper Sherwood Limited | Information & communication | 2020 |
| Chorus Worldwide Limited | Information & communication | 2014 |
| Chris Lloyd Creative Ltd | Information & communication | 2021 |
| Chris Mason and Associates Limited | Extraterritorial | 2024 |
| Chris Morgan Photography Ltd | Professional & scientific | 2022 |
| Chris O'Neill Mortgages Limited | Financial services | 2017 |
| Chris Williams Advisory Ltd | Professional & scientific | 2023 |
| Christian Lorenz Ltd | Professional & scientific | 2014 |
| Chromatic Brands Limited | Professional & scientific | 2012 |
| Churcham House LLP | | 2007 |
| Churcham House Teddington Ltd | Administrative & support | 2013 |
| Ciaran Boyle Constructions Limited | Construction | 2015 |
| Cicily Ventures Ltd | Real estate | 2025 |
| Ciku Construction Services Limited | Construction | 2006 |
| Ciku Contracts Limited | Construction | 2012 |
| Ciku Group Limited | Real estate | 2017 |
| Ciku Holdings Limited | Hospitality | 2017 |
| Ciku Plant Limited | Administrative & support | 2017 |
| Ciku Training Services Limited | Construction | 2017 |
| Cinematica Limited | Professional & scientific | 2011 |
| Cipher Sugar Trade Limited | Wholesale & retail | 2025 |
| Circ Construction Management Limited | Construction | 2018 |
| Circ Management LLP | | 2009 |
| Circit UK Limited | Financial services | 2021 |
| Citius FM Associates Limited | Construction | 2014 |
| Citrine London Limited | Professional & scientific | 2020 |
| Citrus Films Limited | Information & communication | 2012 |
| City Cooling Services Limited | Administrative & support | 2002 |
| City Inn Ltd | Hospitality | 2023 |
| Civitas Associates Limited | Administrative & support | 2002 |
| CJB Staffing Solutions Limited | Administrative & support | 2010 |
| Cjryder Consulting Limited | Professional & scientific | 2014 |
| CJS Data Ltd | Information & communication | 2016 |
| CK Construction (London) Ltd | Construction | 2017 |
| CL Corporation Limited | Hospitality | 2019 |
| CL Personnel Ltd | Administrative & support | 2019 |
| Claficionado Press Ltd | Information & communication | 2021 |
| Claimadvance Property Management Limited | Households | 1987 |
| Claire Davis Limited | Professional & scientific | 2026 |
| Clapham Junction Sushi Limited | Hospitality | 2018 |
| Clare Smith Kingston Dyslexia Services Ltd | Education | 2016 |
| Claremount Estates (Tufton Street) Ltd. | Professional & scientific | 1989 |