| Buy Roof Tiles Limited | Wholesale & retail | 2016 |
| Buy Roofing Slate Ltd | Extraterritorial | 2021 |
| Buy Samaca Slate Ltd | Extraterritorial | 2021 |
| Buy Slates Ltd | Extraterritorial | 2021 |
| Buy Spanish Slate Ltd | Extraterritorial | 2021 |
| BY Walid Limited | Wholesale & retail | 2012 |
| C T Services Group Limited | Administrative & support | 1991 |
| Calm Lagoon Limited | Hospitality | 2024 |
| Camberley Properties Ltd | Real estate | 2021 |
| Cambridge Psychology Limited | Health & social care | 2016 |
| Camden Mews Limited | Construction | 2018 |
| Campbell and Cromarty Limited | Information & communication | 2011 |
| Campbell Tickell Holdings Limited | Financial services | 2005 |
| Campbell Tickell Limited | Professional & scientific | 2003 |
| Canvas Sports Group Ltd | Arts & recreation | 2024 |
| Capden Asset Ltd | Financial services | 2018 |
| Capital Opportunities Limited | Construction | 2019 |
| Carding Limited | Real estate | 1962 |
| Cartodb UK Limited | Information & communication | 2016 |
| Catalogic Software Limited | Other services | 2013 |
| Catford Homes Limited | Real estate | 2015 |
| Cavendish Brooke Limited | Professional & scientific | 2005 |
| CDP Sales Ltd | Wholesale & retail | 2026 |
| Centric Investments Limited | Construction | 1973 |
| Centric Retail Investments Limited | Real estate | 2009 |
| Centric Securities Limited | Construction | 1971 |
| Chai Meats Limited | Manufacturing | 1998 |
| Chanat Workforce Relocations Ltd | Hospitality | 2022 |
| Charmhill Limited | Real estate | 1993 |
| Chekitnoo Limited | Hospitality | 2024 |
| Chess Digital Marketing Limited | Administrative & support | 2023 |
| Chester Investment Holdings Limited | Real estate | 2024 |
| Chiko WIN Limited | Real estate | 2025 |
| Child and Family Consultants Limited | Extraterritorial | 2000 |
| China City (RS) Limited | Hospitality | 2023 |
| Chisou (Knightsbridge) Limited | Hospitality | 2021 |
| Chisou Trading Limited | Real estate | 2018 |
| Christchurch Capital Advisors Limited | Administrative & support | 2011 |
| Citizen P Productions Limited | Information & communication | 2025 |
| City & West Developments Limited | Professional & scientific | 2010 |
| City & Westminster Developments Limited | Construction | 1996 |
| City Meds Ltd | Wholesale & retail | 2022 |
| Cityzen Investments Limited | Real estate | 2004 |
| Cityzen Property London Limited | Real estate | 2013 |
| Cityzen Property Management Ltd | Real estate | 2005 |
| Clearstory Limited | Information & communication | 2010 |
| Clerkenwell Property Investments LLP | | 2013 |
| Click to Purchase Limited | Professional & scientific | 2010 |
| Clip Lifestyle Limited | Wholesale & retail | 2025 |
| Clitterhouse Limited | Real estate | 2014 |
| Cloud Watching Limited | Construction | 2021 |
| CMC Biopharma Ltd | Manufacturing | 2021 |
| Codaire Limited | Information & communication | 2024 |
| Cogito Group Ltd | Information & communication | 2018 |
| Cold CUT Limited | Hospitality | 2023 |
| Coled Limited | Real estate | 2018 |
| Colindale Local Ltd | Wholesale & retail | 2014 |
| Collaborative Office of Research and Design Limited | Professional & scientific | 2016 |
| Combat Fitness Games Limited | Arts & recreation | 2018 |
| Complete Home Solutions (London) Limited | Construction | 2025 |
| Concept & Trends Limited | Administrative & support | 2009 |
| Copycoder Ltd | Information & communication | 2024 |
| Cortune Ltd | Real estate | 2004 |
| Crisis Houses Support Ltd | Administrative & support | 2023 |
| Crowdale Limited | Construction | 1995 |
| Crowther Market Limited | Real estate | 2002 |
| Cubic Investments Limited | Construction | 1965 |
| Cupa Slate Ltd | Extraterritorial | 2021 |
| D.C.L.P. Transport Limited | Transport & logistics | 1962 |
| Dajtrain Limited | Other services | 1982 |
| Daniel Statham Limited | Professional & scientific | 2009 |
| Daniel Stern Enterprises Ltd | Real estate | 2023 |
| Danjbobby Ltd | Professional & scientific | 2017 |
| Darn 96 Limited | Hospitality | 2024 |
| Dartford PG Limited | Hospitality | 2024 |
| Davies Murch Limited | Construction | 2014 |
| Dean Dugdale (Withernsea) Ltd | Wholesale & retail | 2023 |
| Dean Dugdale Limited | Wholesale & retail | 2018 |
| Deauville Developments UK Ltd | Construction | 2006 |
| DEE Family Holdings Limited | Financial services | 2021 |
| Deli W1 Limited | Hospitality | 2026 |
| Densco Design & Works Limited | Construction | 2026 |
| Densco Trading Co Limited | Professional & scientific | 2026 |
| Dent.O.Care Brands Ltd | Wholesale & retail | 2013 |
| Dent.O.Care Professional Ltd | Wholesale & retail | 1990 |
| Dimple Motors Colindale Ltd | Wholesale & retail | 2015 |
| Dimple Motors UK Ltd | Wholesale & retail | 2009 |
| Dinu Residential Limited | Real estate | 2020 |
| Distributed Ledger Technologies Ltd | Information & communication | 2021 |
| DJS Properties London Limited | Construction | 2008 |
| DNB Estates Limited | Real estate | 2012 |
| Double FTV Ltd | Information & communication | 2020 |
| Dove Tree Consultancy Limited | Administrative & support | 2022 |
| DRB Solutions Ltd | Real estate | 2023 |
| Dudugoo Limited | Hospitality | 2025 |
| Dugri Limited | Hospitality | 2024 |
| Duotom Investments Limited | Real estate | 1959 |
| Dynasty Uxbridge Limited | Extraterritorial | 2018 |
| E Innofacturer (UK) Limited | Other services | 2022 |
| Earlspring Property Investments Limited | Administrative & support | 2009 |