| Catfish Films Limited | Arts & recreation | 2000 |
| Catherine Place Consultancy Limited | Administrative & support | 2023 |
| Catherine Southon Auctioneers & Valuers Ltd | Administrative & support | 2012 |
| Causis Group Ltd | Manufacturing | 2021 |
| Cavendish Close Limited | Health & social care | 1989 |
| Caverleigh Place (Bromley) Management Company Limited | Households | 2011 |
| Cavsoc Ltd | Information & communication | 2018 |
| CB Boxing Limited | Arts & recreation | 2019 |
| CB Forklifts Ltd | Professional & scientific | 2024 |
| CB Installations (Bromley) Ltd | Construction | 2021 |
| CBT Business Solutions Ltd. | Professional & scientific | 2002 |
| CC Adventures Ltd | Administrative & support | 2021 |
| CCB Properties Ltd | Construction | 2017 |
| CCM Facades Ltd | Construction | 2026 |
| CCM Media Limited | Information & communication | 2015 |
| CCW Advisors Limited | Administrative & support | 2019 |
| Cdcastleconsultancy Ltd | Construction | 2019 |
| Cdgc Limited | Professional & scientific | 2016 |
| Cdiesel Ltd | Manufacturing | 2018 |
| CDM LDN Ltd | Other services | 2023 |
| CDN Media Limited | Information & communication | 2024 |
| Cebe Limited | Wholesale & retail | 2025 |
| Ceci Alves Academy Ltd | Education | 2026 |
| Cedar Gardens (Hitchin) Management Company Limited | Households | 2016 |
| CEE Gardening & Soft Landscaping Limited | Administrative & support | 2009 |
| Celestial Chauffeurs Limited | Transport & logistics | 2026 |
| Cellar Venture Ltd | Wholesale & retail | 2020 |
| Celox Yachting Ltd | Extraterritorial | 2021 |
| Centaur Financing Ltd | Financial services | 2015 |
| Centaur Property Company Limited | Real estate | 1982 |
| Centaur Property Estates Limited | Real estate | 1981 |
| Centaur Property Group Limited | Real estate | 1997 |
| Centaur Property Investments Limited | Real estate | 1998 |
| Centaur Residential Properties Limited | Real estate | 2015 |
| Central & City Properties Limited | Construction | 1972 |
| Central and District Properties Ltd | Real estate | 1989 |
| Central Electrical Contracting Limited | Construction | 2018 |
| Central Russian Language School Limited | Education | 2009 |
| Centre for Sustainable Development and Climate Change Ltd | Wholesale & retail | 2020 |
| Centroil Investment Ltd | Wholesale & retail | 2025 |
| Century 4 Security Ltd | Information & communication | 2020 |
| Century House (Freehold) Limited | Households | 2013 |
| Century Tower RTM Company Limited | Households | 2024 |
| CEO Finance Ltd | Financial services | 2015 |
| Ceramic Tiling Ltd | Construction | 2018 |
| Certi.Fi Music Ltd | Information & communication | 2023 |
| Certi.Fi World Ltd | Information & communication | 2024 |
| Certificial A1 Ltd | Financial services | 2025 |
| Certify My Property Ltd | Real estate | 2019 |
| Certitude Surveyors LLP | | 2021 |
| Cerulean Holdings Ltd | Other services | 2025 |
| Cevo London Ltd | Extraterritorial | 2026 |
| CFS (Chattaway Financial Services) Limited | Financial services | 2013 |
| CFS Construction Ltd | Construction | 2018 |
| CG Brothers Limited | Construction | 2025 |
| CG Compliance Ltd | Professional & scientific | 2023 |
| CG Healthcare Training Ltd | Health & social care | 2018 |
| CG Management Consulting Limited | Administrative & support | 2018 |
| Cgvg UK Limited | Information & communication | 2025 |
| CH Residential Ltd | Real estate | 2005 |
| Chadwick Project Services Ltd | Construction | 2020 |
| Chahl and Boken Ltd | Wholesale & retail | 2026 |
| Chai Hub Ltd | Hospitality | 2026 |
| Chai STF Ltd | Hospitality | 2021 |
| Chai World Ltd | Hospitality | 2026 |
| Chaika Health Limited | Health & social care | 2024 |
| Chain Finance Ltd | Real estate | 2018 |
| Chain Free Ltd | Real estate | 2022 |
| Chainmakers Property Investments Limited | Real estate | 2026 |
| Chalk Financial Limited | Financial services | 2016 |
| Chalk PR Ltd | Professional & scientific | 2004 |
| Challenge Maintenance Limited | Administrative & support | 2021 |
| Chambers Management Consulting Limited | Real estate | 2019 |
| Champion Properties LLP | | 2006 |
| Chancellor Court (Freehold) Limited | Households | 1999 |
| Chandlers Court (Elgar Street) Management Ltd. | Households | 2002 |
| Chandlers Court (London) RTM Company Limited | Real estate | 2020 |
| Chandravimal Lodges Limited | Real estate | 2017 |
| Chantry Studios LLP | | 2012 |
| Chaplin Court Management Limited | Households | 2008 |
| Chapman Courtyard Residents Limited | Households | 2018 |
| Chapman House (Feltham) RTM Company Limited | Real estate | 2017 |
| Charfes Mechanical & Electrical Ltd | Construction | 2026 |
| Charis Communications | Other services | 2007 |
| Charles Warren Ltd | Wholesale & retail | 2023 |
| Charlie&Tilly Ltd | Households | 2024 |
| Charlotte House RTM Company Limited | Households | 2023 |
| Charlotte Miller Limited | Administrative & support | 2020 |
| Charls Corporation Limited | Financial services | 2022 |
| Charls Infra Co. Ltd | Real estate | 2026 |
| Charlton Church Lane Limited | Households | 2009 |
| Charrismount Ltd | Information & communication | 2014 |
| Charterhouse Medical UK Limited | Administrative & support | 2018 |
| Chartreuse Limited | Households | 2024 |
| Chartwell Trustee Pension Solutions Ltd | Financial services | 2007 |
| Charville Court RTM Company Limited | Real estate | 2017 |
| Chase Department Stores Ltd | Wholesale & retail | 2022 |
| Chase Fashions (UK) Limited | Wholesale & retail | 2022 |
| Chase Retail Stores Ltd | Wholesale & retail | 2023 |
| Chase Wheels Ltd | Wholesale & retail | 2025 |