| CH Global Group Ltd | Financial services | 2018 |
| Chalfont ST Giles Properties Limited | Real estate | 1971 |
| Chancery Wall Financial Services Ltd | Financial services | 2012 |
| Chancery Wall Future Planning Ltd | Financial services | 2013 |
| Chanehros Ltd | Real estate | 2020 |
| Chaoscafe Ltd | Information & communication | 2012 |
| Chappa Way Limited | Information & communication | 2021 |
| Chapter Eight Design Ltd | Professional & scientific | 2017 |
| Charles Alexander Associates Limited | Financial services | 2003 |
| Charles Allotey & Rose Ltd | Professional & scientific | 2026 |
| Charlie & Ralph Ltd | Wholesale & retail | 2017 |
| Charlotte Baxter Limited | Other services | 2011 |
| Charm Nannies Ltd | Households | 2024 |
| Charterhouse Square Holdings Limited | Construction | 1988 |
| Chartley Developments Limited | Construction | 2024 |
| Chartridge Court Stanmore Management Limited | Real estate | 1998 |
| Chase Morgan Limited | Real estate | 2005 |
| Chat Inc Limited | Information & communication | 2024 |
| Chat Sense Limited | Professional & scientific | 2024 |
| Chatsmore House Developments Ltd | Construction | 2022 |
| Chauntry Surveying Limited | Professional & scientific | 2017 |
| Cheema Brothers Limited | Construction | 2011 |
| Cheema Property Investments Ltd | Real estate | 2023 |
| Cheese Factory Ltd | Manufacturing | 2023 |
| Chefora Ltd | Hospitality | 2026 |
| Chelsea Group Ltd | Information & communication | 2018 |
| Chelsea Property Services Limited | Construction | 2025 |
| Cheqmar Ltd | Financial services | 2020 |
| Chequers Property Limited | Real estate | 2022 |
| Cheshire Medical Services Limited | Health & social care | 2004 |
| Cheshire Residential Properties Limited | Real estate | 2011 |
| Chestnut Brand Limited | Hospitality | 2020 |
| Cheyne Mountbatten Limited | Real estate | 2021 |
| Chickin Warriors Limited | Wholesale & retail | 2021 |
| Chief and Ground Rents Limited | Construction | 1972 |
| Chilard+Jordan Limited | Financial services | 2023 |
| Chili Masala Ltd | Hospitality | 2006 |
| Chilli MK Limited | Hospitality | 2018 |
| Chiltern Court (Muswell Hill) Management Company Limited | Households | 1986 |
| Chimbango Limited | Information & communication | 1990 |
| Chips Charity Limited | Health & social care | 2017 |
| Chisbury Property (Management) Limited | Other services | 1981 |
| Chivermart Limited | Real estate | 1998 |
| Chloe & Sophie Property's Ltd | Real estate | 2022 |
| Chlomax Limited | Construction | 2025 |
| Chocolate Lounge Limited | Extraterritorial | 2016 |
| Choice Tickets Ltd | Arts & recreation | 2009 |
| Chomoko Properties Ltd | Real estate | 2018 |
| Chop Media Limited | Information & communication | 2023 |
| Chris Raja Solicitors Ltd | Professional & scientific | 2021 |
| Chrissyb Properties Ltd | Financial services | 2025 |
| Christopher Pillitz & Associates Limited | Administrative & support | 2010 |
| Chronicle Limited | Construction | 1981 |
| Chui Limited | Real estate | 2022 |
| Churchill Productions Limited | Arts & recreation | 1997 |
| Ciaojoe Limited | Professional & scientific | 2016 |
| CIB Services Ltd | Construction | 2021 |
| Cimbru Cleaning Ltd | Administrative & support | 2024 |
| Cintel (UK) Ltd | Professional & scientific | 2019 |
| Cintelvy Healthcare Ltd | Health & social care | 2014 |
| CIO Development Ltd. | Administrative & support | 1996 |
| Ciprian Construction Services Ltd | Construction | 2025 |
| Circ Regen Ltd | Construction | 2023 |
| CIRCLE08 Limited | Other services | 2018 |
| CIRCLE08 Media Limited | Other services | 2021 |
| Circular Threads Ltd | Wholesale & retail | 2021 |
| CIS Solutions Limited | Construction | 2009 |
| Citibond Travel (London) Limited | Administrative & support | 1987 |
| Citizens Advice Hillingdon Ltd | Other services | 1995 |
| City & Town Estates Ltd | Real estate | 2013 |
| City & Town Homes Ltd | Real estate | 2019 |
| City BOY Movement Diaspora UK Limited | Other services | 2026 |
| City Contractors Group Limited | Construction | 2018 |
| City Driving Instructor Ltd | Education | 2026 |
| City Exports Limited | Wholesale & retail | 2020 |
| City Tours Co. Ltd | Administrative & support | 2024 |
| Ciurea Rail Services Ltd | Construction | 2016 |
| Civil Law Consultancy Limited | Professional & scientific | 2022 |
| Civiq Ltd | Professional & scientific | 2024 |
| CJ Hirani Consulting Ltd | Professional & scientific | 2023 |
| CKJ Enterprise Limited | Real estate | 2022 |
| Ckrd Accountants Ltd | Professional & scientific | 2011 |
| CL Investments 1 Ltd | Real estate | 2016 |
| CL Investments 2 Ltd | Real estate | 2016 |
| CL Investments 3 Ltd | Real estate | 2017 |
| CL Investments 4 Ltd | Real estate | 2018 |
| CL Investments 5 Ltd | Real estate | 2020 |
| CL Investments 6 Ltd | Real estate | 2021 |
| CL Investments 7 Ltd | Real estate | 2022 |
| CL Investments 8 Limited | Real estate | 2024 |
| CL Investments 9 Limited | Real estate | 2024 |
| Claddagh Electrics Ltd | Construction | 2019 |
| Clanrye Consulting Ltd | Administrative & support | 2024 |
| Clap-Banner Limited | Wholesale & retail | 2003 |
| Claret-E Limited | Wholesale & retail | 2000 |
| Clarity Dental Limited | Health & social care | 2019 |
| Clarkes Heating & Plumbing Limited | Construction | 2012 |
| CLAUD21 Limited | Professional & scientific | 2015 |
| Claudjon Ltd | Real estate | 2020 |
| Clay Lever and Byte Limited | Professional & scientific | 2018 |