| Carburton Investments Limited | Construction | 1963 |
| Carina International Limited | Financial services | 1991 |
| Casale Electrical Ltd | Construction | 2026 |
| Castile Investments Limited | Real estate | 2009 |
| Centron Homes Northampton Limited | Construction | 2003 |
| Chamdol UK Ltd | Wholesale & retail | 2000 |
| Chameleon Mode Ltd | Administrative & support | 2011 |
| Chantries Limited | Real estate | 2004 |
| Chemcoal LLP | | 2011 |
| Chiltern Aesthetics Limited | Other services | 2015 |
| Chiltern Hygienist Ltd | Health & social care | 2023 |
| Chimptastic Limited | Arts & recreation | 2007 |
| Chobham ST Limited | Real estate | 2014 |
| Chrome Transport LLP | | 2023 |
| Cimbali Group UK Limited | Wholesale & retail | 1973 |
| Citi Dental LAB Limited | Health & social care | 2017 |
| Community GA Worldwide Limited | Education | 2022 |
| Completed Connections Ltd. | Real estate | 2015 |
| Construction Law Consultant Ltd | Professional & scientific | 2010 |
| Core Origins Ltd | Real estate | 2026 |
| Corporate ID Direct Limited | Professional & scientific | 2012 |
| Couriergen Transport LLP | | 2023 |
| Courteous Distribution LLP | | 2020 |
| CPA (LPC) Recoveries Limited | Administrative & support | 2016 |
| CPA (Paid) Limited | Financial services | 1991 |
| CPA On-Line Ltd | Financial services | 1987 |
| CPE (New Homes) Limited | Real estate | 2025 |
| Creditcare Limited | Administrative & support | 2022 |
| Creditpro Limited | Administrative & support | 2016 |
| Creditpro Systems Limited | Other services | 2024 |
| Creighton Property & Development Limited | Construction | 2018 |
| Crest Management Co. (Finchley) Limited(The) | Other services | 1986 |
| Crippalm Limited | Construction | 1977 |
| Cybergelt Limited | Transport & logistics | 2000 |
| D R Hales Plumbing Limited | Other services | 2010 |
| D.C.S. Build & Design Limited | Construction | 2005 |
| DA Elite Ltd | Professional & scientific | 2024 |
| Dale Road Limited | Households | 2011 |
| Dauksoft Solutions Limited | Information & communication | 2013 |
| Davis Steele Holdings Limited | Professional & scientific | 2009 |
| Davis Steele Limited | Extraterritorial | 1963 |
| Day Distributors Limited | Wholesale & retail | 2006 |
| Deblaur Limited | Real estate | 2017 |
| Dell Design & Build Limited | Construction | 2022 |
| Design Enterprise Limited | Information & communication | 2002 |
| Diamonds Chauffeurs Ltd | Transport & logistics | 2024 |
| Different Insights LLP | | 2020 |
| Different Insights Management Limited | Administrative & support | 2023 |
| Dina International General Trading Ltd | Wholesale & retail | 2021 |
| Diplomatic World Minerals Ltd | Professional & scientific | 2023 |
| Direct Milk Supplies Limited | Wholesale & retail | 1967 |
| Direct Milk Supplies Trustees Limited | Professional & scientific | 2024 |
| Direct Service Logistics UK Limited | Transport & logistics | 2008 |
| Divine Brother Limited | Wholesale & retail | 2014 |
| Don'T Waste UK Ltd | Administrative & support | 2015 |
| Dorcha Limited | Financial services | 2016 |
| Dousiefit Limited | Other services | 2026 |
| Drove Parcel Service LLP | | 2020 |
| DST Trading Limited | Financial services | 2020 |
| E-Planet Educational Services Ltd | Administrative & support | 2014 |
| Easitrade Limited | Wholesale & retail | 2019 |
| Edmunds House Management Company Limited | Households | 2013 |
| Elevate Physio & Performance Limited | Health & social care | 2019 |
| Elias Fish Ltd | Wholesale & retail | 2020 |
| Elite Tyres (UK) Limited | Wholesale & retail | 2017 |
| Elite Utility Limited | Administrative & support | 2026 |
| Elstree Estates Limited | Real estate | 2014 |
| Embarkus Ltd | Public administration | 2022 |
| Emerging Leaders Coach Limited | Administrative & support | 2021 |
| Emissions Monitoring UK Limited | Manufacturing | 2018 |
| Enim Vero Ltd | Administrative & support | 2010 |
| Enimvero 1 Limited | Real estate | 2016 |
| Erin Homes (Alperton) Limited | Real estate | 2014 |
| Erin Homes (Sudbury) Limited | Real estate | 2017 |
| Erin Homes Ltd | Real estate | 2010 |
| Etonace Limited | Professional & scientific | 1993 |
| Eventique Ltd | Arts & recreation | 2015 |
| Extreme Media Limited | Professional & scientific | 2020 |
| Fastkey 2 Ecommerce Ltd | Wholesale & retail | 2023 |
| Fazeos Ltd | Education | 2025 |
| Feather and Shell Ltd | Extraterritorial | 2017 |
| Feiner Developments Limited | Real estate | 2001 |
| Ferota Limited | Professional & scientific | 1995 |
| Fine Transport Limited | Transport & logistics | 2025 |
| Fizzy Juice Limited | Arts & recreation | 2016 |
| Flatley Construction Limited | Construction | 1979 |
| Flatley Hill Ltd | Real estate | 2018 |
| Flatley Holdings Ltd | Real estate | 2017 |
| Flatley ST Pauls Ltd | Construction | 2018 |
| Flatley Woods Ltd | Construction | 2018 |
| Flobell Group Ltd | Other services | 2020 |
| Fordham Sports Limited | Arts & recreation | 2019 |
| Forward Financial Accounting Limited | Professional & scientific | 2011 |
| Foto Plus Limited | Professional & scientific | 1988 |
| G Shankerdas & Sons (UK) Limited | Wholesale & retail | 1999 |
| G-Force Fitness Limited | Transport & logistics | 1994 |
| G.J.F.Properties Limited | Real estate | 1960 |
| GAD Properties Limited | Real estate | 2007 |
| GB Homes Limited | Real estate | 2024 |
| General Delivery Services LLP | | 2023 |