| Cocomero Consulting Limited | Professional & scientific | 2017 |
| Cocoon Upholstery Ltd | Other services | 2020 |
| Code Green Ltd | Information & communication | 2014 |
| Coffee Company Hada Ltd | Wholesale & retail | 2025 |
| Coffey and Son’S Property Ltd | Real estate | 2024 |
| Colin Banks Media Limited | Professional & scientific | 2012 |
| Collaborative Ants Limited | Professional & scientific | 2022 |
| College Gate Management Limited | Households | 1990 |
| Colognebyimage Ltd | Wholesale & retail | 2022 |
| Commercial Kitchen Services (Surrey) Limited | Wholesale & retail | 2009 |
| Commgas Limited | Construction | 2012 |
| Competitive Edge Sports Ltd | Arts & recreation | 2010 |
| Conative & Co. Limited | Professional & scientific | 2012 |
| Concode Support Services Group Limited | Administrative & support | 2023 |
| Concord Care Services Ltd | Health & social care | 2020 |
| Congyi Cultural Communication UK Co., Ltd | Wholesale & retail | 2022 |
| Conifers (Teddington) Residents Association Limited(The) | Households | 1981 |
| Connect TEE Private Limited | Information & communication | 2025 |
| Connected With Style Limited | Households | 2010 |
| Constantia Flooring Limited | Construction | 2012 |
| Consultingbucks Limited | Professional & scientific | 2017 |
| Continental Assets Limited | Financial services | 2000 |
| Convent Mews Residents Management Company Limited | Households | 2012 |
| Coombe Academy Trust | Education | 2012 |
| Coombe Beauty Ltd | Other services | 2023 |
| Coombe Consulting Services Limited | Professional & scientific | 2023 |
| Coombe House Chase Limited | Professional & scientific | 1967 |
| Coombe House Estate Residents' Association Limited | Other services | 1963 |
| Coombe House Gardens Limited | Households | 1993 |
| Coombe Medical Services Ltd | Health & social care | 2004 |
| Coombe Park Limited | Households | 2004 |
| Coombe Ridings Management Company Limited | Households | 1987 |
| Coombe Road (Kingston) Management Company Limited | Households | 1996 |
| Coombe Roads Association Limited | Households | 1936 |
| Coopers Lodge Management Limited | Households | 1988 |
| Corea Limited | Professional & scientific | 2011 |
| Corelax Ltd | Wholesale & retail | 2023 |
| Coriander Holdings Ltd | Wholesale & retail | 2024 |
| Cornel B Limited | Administrative & support | 2016 |
| Cornerstone Studios Ltd | Wholesale & retail | 2023 |
| Corporate Battlefields Limited | Administrative & support | 2005 |
| Cotman Close Freehold Limited | Households | 1987 |
| Cougar Bidco London Limited | Arts & recreation | 2013 |
| Cougar Holdco London Limited | Arts & recreation | 2013 |
| County West Investments Limited | Real estate | 1991 |
| Court Lodge Property Management Ltd | Extraterritorial | 2007 |
| Cradleland Healthcare Services Ltd | Health & social care | 2025 |
| Craigside Galsworthy Road (Kingston) Limited | Households | 1982 |
| Cranleigh House SW20 Limited | Households | 2014 |
| Creassive UK Limited | Wholesale & retail | 2020 |
| Creations & Advice.Up Ltd | Professional & scientific | 2021 |
| Creative Baking Ltd | Manufacturing | 2020 |
| Creative Building Performance Limited | Manufacturing | 2009 |
| Creative Capital London Ltd | Wholesale & retail | 2013 |
| Crestpoint Consulting Solutions Limited | Information & communication | 2024 |
| Crew Technology Limited | Information & communication | 2011 |
| Crimson Glacier Group Ltd | Real estate | 2026 |
| Crispin Engineering Limited | Manufacturing | 2014 |
| Cross the World Ltd | Administrative & support | 2023 |
| Cross Wildness Consultant Ltd | Wholesale & retail | 2024 |
| Crossover Fitness Ltd | Arts & recreation | 2026 |
| Crown Security and Fire Systems Ltd | Extraterritorial | 2019 |
| CSC Property Services Limited | Construction | 2025 |
| CSK Management UK Ltd | Professional & scientific | 2023 |
| CT (Residential Holdings) Limited | Construction | 2017 |
| Cuddleup Limited | Information & communication | 2015 |
| Cupclub Limited | Information & communication | 2015 |
| Cuppa Chaii (New Malden) Ltd | Hospitality | 2025 |
| Curatio Consulting Ltd | Administrative & support | 2023 |
| Curatio Ltd | Financial services | 2023 |
| Curatio Productions Ltd | Professional & scientific | 2023 |
| Curatio Property Services Ltd | Real estate | 2023 |
| Curiosity Holborn Limited | Wholesale & retail | 2003 |
| Curry Leaves UK Limited | Hospitality | 2016 |
| Curtis and Beaton Ltd | Information & communication | 2025 |
| Custom Steering Ltd | Wholesale & retail | 2019 |
| CV Tiler Ltd | Construction | 2022 |
| CVP Properties Limited Liability Partnership | | 2019 |
| CWC Flooring Limited | Other services | 2011 |
| CWZ Consulting Limited | Professional & scientific | 2015 |
| CXO Services Limited | Professional & scientific | 2018 |
| CY LEE Promotions (UK) Limited | Other services | 2009 |
| Cyberconverge Solutions Limited | Information & communication | 2024 |
| Cyforge Labs Limited | Information & communication | 2025 |
| Cyrus Asset Management Ltd | Real estate | 2026 |
| Cyrus Soft Power Ltd | Construction | 2016 |
| D & D Retail Stores Limited | Hospitality | 2011 |
| D&M Services Ltd | Transport & logistics | 2018 |
| D&O Food Limited | Hospitality | 2024 |
| Daash Limited | Extraterritorial | 2013 |
| Dahlia House Ltd | Wholesale & retail | 2011 |
| Daketon Ltd | Wholesale & retail | 2023 |
| Dalyan (UK) Limited | Professional & scientific | 1993 |
| Damireuk Ltd | Hospitality | 2023 |
| Damyang Ltd | Hospitality | 2018 |
| Daniel Johnson Ltd | Real estate | 2025 |
| Daonarch Ltd | Hospitality | 2024 |
| DAR Family Investment Limited | Real estate | 2020 |
| Darex Plumbing Limited | Construction | 2015 |
| Darren Webster (London) Limited | Other services | 2017 |