| Cutec Logistics Limited | Transport & logistics | 2025 |
| Cutie House (Fareham) Limited | Hospitality | 2019 |
| CV Pilots Limited | Other services | 2025 |
| Cvem Construction Ltd | Construction | 2026 |
| Cvjury Limited | Information & communication | 2022 |
| CVL Estates Ltd | Real estate | 2021 |
| CW Dwellings Ltd | Real estate | 2026 |
| CW Living Ltd | Households | 2026 |
| CW Performance LLP | | 2019 |
| CW Property (Wiltshire) Ltd | Real estate | 2023 |
| CW Tiling Limited | Construction | 2022 |
| CW100 Ltd | Transport & logistics | 2023 |
| CWE Consultants Ltd | Professional & scientific | 2019 |
| CX Events Ltd | Hospitality | 2024 |
| CXC Ltd | Information & communication | 2022 |
| Cyan Ellis Limited | Information & communication | 1995 |
| Cyber & AI Advisors Limited | Professional & scientific | 2014 |
| Cyberratss Ltd | Information & communication | 2015 |
| Cybranco Limited | Professional & scientific | 2006 |
| Cylashes Ltd | Other services | 2025 |
| Cynergy 3 Limited | Financial services | 2014 |
| CYNERGY3 Components FAB Limited | Extraterritorial | 2002 |
| CYNERGY3 Components Limited | Manufacturing | 1995 |
| CYNERGY3 Property Limited | Real estate | 2015 |
| CYO Seeds West Ltd | Agriculture & fishing | 2020 |
| Cyphas Property Investments Ltd. | Real estate | 2017 |
| Cyrax Ltd | Transport & logistics | 2022 |
| Cyto Software Limited | Information & communication | 2022 |
| CZ One Limited | Wholesale & retail | 2014 |
| CZ211 Ltd | Hospitality | 2024 |
| CZS Pubs Ltd | Hospitality | 2025 |
| D & C Medical Ltd | Public administration | 2022 |
| D & J Carpenters Limited | Manufacturing | 2017 |
| D J Pet Services Ltd | Other services | 2025 |
| D M J Computer Services Limited | Information & communication | 1985 |
| D M Lewis Ltd | Health & social care | 2004 |
| D MAX Brickwork Limited | Construction | 2019 |
| D O Kyte & SON Ltd | Agriculture & fishing | 2023 |
| D P Paving Contractors Limited | Construction | 2017 |
| D ROY Limited | Wholesale & retail | 2022 |
| D Souza Kitchen Ltd | Hospitality | 2019 |
| D W S Property Services Limited | Construction | 2004 |
| D Watts Bathrooms & Tiling Limited | Construction | 2025 |
| D Williams Groundworks Civil Engineering Ltd | Construction | 2019 |
| D&B Group Carpentry Ltd | Construction | 2021 |
| D&D Property & Lettings Ltd | Real estate | 2025 |
| D&G Excel Ltd | Administrative & support | 2016 |
| D&H Detailing Ltd | Wholesale & retail | 2025 |
| D&J Building Services Limited | Construction | 2019 |
| D&J R Holdings Ltd | Real estate | 2023 |
| D&N Cleaning Innovation Ltd | Information & communication | 2025 |
| D&N Training Academy Ltd | Education | 2022 |
| D&R Heating Services Ltd | Construction | 2018 |
| D&S Auto Services Ltd | Wholesale & retail | 2026 |
| D&S Multi Services Ltd | Construction | 2019 |
| D&T Funding Ltd | Financial services | 2023 |
| D'Arcy Lawes Windows Ltd | Extraterritorial | 2014 |
| D-B Property Improvements Ltd | Construction | 2023 |
| D-Costa Limited | Construction | 2015 |
| D.A. Windows & Doors Limited | Construction | 2004 |
| D.A.S. Financial Services (Swindon) Limited | Professional & scientific | 2002 |
| D.C.M. Solutions Limited | Information & communication | 2003 |
| D.Kent Developments Ltd | Construction | 2016 |
| D3 Urban Drive Ltd | Transport & logistics | 2025 |
| DA Barnett Decorators Ltd | Construction | 2012 |
| DA Contractors Ltd | Construction | 2023 |
| DA Vinci Pizzeria Limited | Hospitality | 2023 |
| DAB Swindon Limited | Information & communication | 2024 |
| Dabble Limited | Transport & logistics | 2013 |
| Dabchick Property Limited | Real estate | 2024 |
| Dabeez Healthcare Solutions Limited | Information & communication | 2021 |
| Dabuska Ltd | Information & communication | 2025 |
| Dabypop Ltd | Health & social care | 2020 |
| DAC Transformation Group Ltd | Professional & scientific | 2026 |
| Dadhich Group Limited | Agriculture & fishing | 2022 |
| Daglish Building Limited | Construction | 1996 |
| Daikon Cirencester Limited | Wholesale & retail | 2020 |
| Daily Home Essentials Ltd | Wholesale & retail | 2026 |
| Dailydealsuk Ltd | Wholesale & retail | 2024 |
| Dailyfriend Ltd | Health & social care | 2026 |
| Dairy Maintain Ltd | Wholesale & retail | 2014 |
| Daisy Brook Property Management Ltd | Administrative & support | 2014 |
| Daisychain Melksham Limited | Health & social care | 2016 |
| Dakar Shipment Ltd | Health & social care | 2020 |
| Dakshinaamurthy Ltd | Wholesale & retail | 2025 |
| Dalai Productions Limited | Administrative & support | 2010 |
| Dalrymple Transport Limited | Transport & logistics | 2015 |
| Damaso UK Ltd | Wholesale & retail | 2021 |
| Dameh Limited | Information & communication | 2010 |
| Damon Limited | Transport & logistics | 2012 |
| Damp Shop Direct Limited | Construction | 2011 |
| Damson Ltd | Manufacturing | 2024 |
| Damyfral Limited | Health & social care | 2025 |
| DAN Francis Financial Planning Limited | Financial services | 2026 |
| DAN TR Limited | Administrative & support | 2015 |
| DAN Woolford Carpentry Limited | Construction | 2019 |
| Dan's Dog Walks Ltd | Other services | 2025 |
| Dan.Niamh Ltd | Hospitality | 2024 |
| Danash Groundworks Ltd | Construction | 2018 |
| Danbuco 72 Limited | Transport & logistics | 2026 |