| Cotra Limited | Information & communication | 2026 |
| Cottoline Limited | Wholesale & retail | 2018 |
| Cotton Twist Ltd | Wholesale & retail | 2016 |
| Courses Manager and Designer Software Solutions Limited | Information & communication | 2017 |
| Cpar Ltd | Professional & scientific | 2020 |
| Craftsman Direct Ltd | Construction | 2006 |
| Craven Capital Consulting Limited | Professional & scientific | 2022 |
| Craven Capital Group Limited | Professional & scientific | 2022 |
| Craven Capital Investments Limited | Professional & scientific | 2022 |
| Craven Capital Management Limited | Professional & scientific | 2022 |
| Crazy Cave Ltd | Real estate | 2025 |
| CRE25 Limited | Real estate | 2017 |
| Creases & Pleats Limited | Other services | 1998 |
| Creole Cousins Ltd | Wholesale & retail | 2023 |
| Crick Heitman Limited | Professional & scientific | 2004 |
| Crimsonbeans Ltd. | Wholesale & retail | 2022 |
| Crinigan Motorsport UK Ltd | Wholesale & retail | 2024 |
| Cristina Ghivnici Ltd | Manufacturing | 2014 |
| Crown Eagle Ltd | Transport & logistics | 2023 |
| Crown Media Limited | Information & communication | 2017 |
| Culmen Consulting Ltd | Professional & scientific | 2014 |
| Cumberland Place (Sunbury) Residents Association Limited | Households | 1965 |
| Curran Construction Bespoke Ltd | Construction | 2020 |
| Curran Construction Ltd | Construction | 2020 |
| Curry House Sunbury Ltd | Hospitality | 2025 |
| Cuvee Limited | Administrative & support | 2007 |
| D & R Channon Limited | Information & communication | 2017 |
| D and D Landscapes Ltd | Administrative & support | 2019 |
| D Consultants Limited | Information & communication | 2017 |
| D.H. Wood (Shopfitting) Limited | Construction | 1967 |
| D4T4 Solutions Limited | Information & communication | 1999 |
| Daffodil Bookkeeping Services Ltd | Professional & scientific | 2019 |
| DAG Security Consultants Ltd | Other services | 2021 |
| Daivra Events and Consultants Limited | Hospitality | 2026 |
| Dakshyn Limited | Other services | 2013 |
| Daksin Transportation Ltd | Transport & logistics | 2022 |
| Dangerfield Installations Ltd | Manufacturing | 2025 |
| DAS77 Ltd | Health & social care | 2023 |
| Dashvale Holdings Limited | Financial services | 2021 |
| Dashvale Limited | Real estate | 1978 |
| Databrazil Limited | Professional & scientific | 2018 |
| Datarex Limited | Information & communication | 1997 |
| Datavalley UK Ltd | Information & communication | 2024 |
| Datavibe Solutions Ltd | Information & communication | 2021 |
| Dawkins Educational Services Ltd | Education | 2023 |
| Dawn Hill Publications Ltd | Information & communication | 2019 |
| DBR Coachhomes Ltd | Real estate | 2025 |
| DE Cann Developments Ltd | Real estate | 2019 |
| DE Consultants Ltd | Professional & scientific | 2018 |
| Deacons Court Ltd | Households | 1999 |
| Dealfindermotors Limited | Wholesale & retail | 2024 |
| Dean Thomas Management Limited | Other services | 2013 |
| DEB Ashley Ltd | Manufacturing | 2019 |
| DED Productions Ltd | Information & communication | 2020 |
| Delhi Chef Limited | Hospitality | 2015 |
| Demand Estates Ltd | Real estate | 2024 |
| Dench Computer Consultants Limited | Professional & scientific | 1997 |
| Dental House Sunbury Limited | Health & social care | 2018 |
| Dermont Logistics Ltd | Transport & logistics | 2023 |
| Desaur & Co (HK) Ltd | Professional & scientific | 2025 |
| Desaur & Co Ltd | Professional & scientific | 2014 |
| Design MAX Limited | Professional & scientific | 2009 |
| Design Studio E Ltd | Information & communication | 2018 |
| Designa Axess UK Limited | Manufacturing | 1997 |
| Deugro (United Kingdom) Limited | Transport & logistics | 1968 |
| Deva Pharma Consultancy Ltd | Information & communication | 2020 |
| Dezignsinspired Ltd | Professional & scientific | 2025 |
| DFS Traders Ltd | Hospitality | 2018 |
| DH Aesthetics Academy Ltd | Education | 2026 |
| DH Aesthetics Clinic Ltd | Health & social care | 2024 |
| Dharmesh Sorathiya Limited | Hospitality | 2016 |
| Diamond Sovereign Group Ltd | Real estate | 2025 |
| Direct Heating Specialists Ltd | Construction | 2016 |
| Direct Independent Care Limited | Health & social care | 2005 |
| Direct Wholesale Traders Ltd | Wholesale & retail | 2025 |
| Dishu Properties Ltd | Real estate | 2024 |
| DLW Company Formation Services 0019 Limited | Extraterritorial | 2013 |
| DR Emily Ruiz Medical Aesthetics Ltd | Health & social care | 2025 |
| DR Salam Consultancy Limited | Health & social care | 2010 |
| Dream Food & Wine Limited | Wholesale & retail | 2018 |
| Drip FED Ltd | Information & communication | 2023 |
| Drive Agile Limited | Information & communication | 2023 |
| Dryft Solutions Ltd | Information & communication | 2024 |
| DS Interactive Limited | Information & communication | 1996 |
| DT Transport Consultancy Ltd | Transport & logistics | 2025 |
| DX2 International Ltd | Other services | 2023 |
| Dynamics CRM Ltd | Information & communication | 2013 |
| Dyno-Rod East London Ltd | Water & waste | 2022 |
| E & a Construction & Developments Limited | Construction | 2024 |
| E C Software Limited | Information & communication | 2011 |
| E Heath Limited | Administrative & support | 2016 |
| E&G Homes Ltd | Real estate | 2026 |
| E.P.P.S Services Ltd | Construction | 2019 |
| Eagle Broadcasting Corporation UK (EBC UK) Limited | Administrative & support | 2018 |
| Easy Care Investments Limited | Real estate | 2020 |
| Easy Care Services Limited | Wholesale & retail | 2005 |
| Echo Edge UK Store Limited | Wholesale & retail | 2025 |
| Ecoactio Ltd | Professional & scientific | 2026 |
| Ecotec Installations Ltd | Construction | 2023 |
| Ecsc Building Company Ltd | Construction | 2020 |