| Custom Kayaks Limited | Wholesale & retail | 2017 |
| Custom Made 4 YOU Ltd | Professional & scientific | 2021 |
| Custompass Ltd | Professional & scientific | 2024 |
| Cutelook Limited | Construction | 1995 |
| Cuthbury Limited | Construction | 2005 |
| Cuthbury Property Maintenance Limited | Professional & scientific | 2014 |
| Cutitoiutranslogistics Ltd | Transport & logistics | 2025 |
| Cutler Rigging Ltd | Information & communication | 2022 |
| Cutter Marine LLP | | 2006 |
| Cuttin' IT Fine Ltd | Wholesale & retail | 2020 |
| Cutwise Carpets Limited | Real estate | 2008 |
| Cuzzi Essence Ltd | Manufacturing | 2024 |
| Cvmm UK Limited | Arts & recreation | 2016 |
| CW Autos Ltd | Wholesale & retail | 2023 |
| CWC Services Ltd | Water & waste | 2020 |
| CWF Bournemouth Limited | Wholesale & retail | 2022 |
| CWM Homes Limited | Construction | 2022 |
| Cyaneus Engineering Ltd | Professional & scientific | 2016 |
| Cyber Innovations Group Ltd | Education | 2026 |
| Cyber Innovations Ltd | Education | 2024 |
| Cyber Safe Systems Ltd | Information & communication | 2023 |
| Cybercology Ltd | Professional & scientific | 2019 |
| Cybmark Ltd | Information & communication | 2020 |
| Cyvex Ltd | Wholesale & retail | 2020 |
| Czed Jewels Ltd | Wholesale & retail | 2025 |
| D & a Property Solutions Limited | Real estate | 2023 |
| D & C Staffing International Ltd | Administrative & support | 2021 |
| D & H Developments (South) Limited | Construction | 2010 |
| D & J Properties Wessex Limited | Real estate | 1999 |
| D & L Consulting (Whitchurch) Limited | Information & communication | 1998 |
| D & N Marsh Limited | Real estate | 2025 |
| D & O Media Solutions Ltd | Professional & scientific | 2025 |
| D 52 Limited | Professional & scientific | 2013 |
| D a G Building Services Limited | Construction | 2016 |
| D a H Bracey & SON Limited | Construction | 2015 |
| D Bostock Ltd | Construction | 2016 |
| D Bradford Memorials Ltd | Manufacturing | 2020 |
| D C Wood Developments Ltd | Construction | 2016 |
| D Centre Convenience Limited | Wholesale & retail | 2025 |
| D Harrison Home Improvements LLP | | 2016 |
| D Hollis Limited | Administrative & support | 2008 |
| D J G Draughting Limited | Professional & scientific | 2008 |
| D M Small Developments Ltd | Construction | 2026 |
| D N Marine Ltd | Manufacturing | 2023 |
| D P Wells Limited | Manufacturing | 2013 |
| D&A Cars Ltd | Wholesale & retail | 2020 |
| D&A Properties (21) Ltd | Real estate | 2021 |
| D&B Hospitality Limited | Professional & scientific | 2023 |
| D&C Investors Primus Ltd | Professional & scientific | 2023 |
| D&D Romanian Ltd | Manufacturing | 2024 |
| D&J London Limited | Real estate | 2021 |
| D&K Castle Limited | Financial services | 2024 |
| D&R Store Ltd | Wholesale & retail | 2019 |
| D'Amato Sport Ltd | Wholesale & retail | 2022 |
| D-Dec Synergy Limited | Health & social care | 2024 |
| D. W. Services (U.K.) Limited | Professional & scientific | 1996 |
| D.D. Ross Limited | Construction | 1999 |
| D.E.Watts Services Ltd | Manufacturing | 2024 |
| D.J Hospitality Ltd | Hospitality | 2026 |
| D.J. Kershaw Limited | Administrative & support | 1995 |
| D.J.G. Industrial Access Limited | Professional & scientific | 2015 |
| D.L.W.S. Investments Ltd | Real estate | 2023 |
| D.O&2 Marketing and Sale Ltd | Wholesale & retail | 2023 |
| D.O.Decoration Ltd | Construction | 2014 |
| D.W. Enterprises Ltd | Health & social care | 2009 |
| D2 Embedded Solutions Limited | Information & communication | 2017 |
| DA Construction Domestic Limited | Construction | 2025 |
| DA Nunzio Italian Delicatessen Ltd | Extraterritorial | 2024 |
| Dablessed Consultancy Services Limited | Health & social care | 2026 |
| Daddy’S Tools Ltd | Wholesale & retail | 2025 |
| Daggett Developments Limited | Households | 2020 |
| Dagobah Limited | Information & communication | 2012 |
| Dahinab Limited | Wholesale & retail | 2025 |
| Daiba Organic Ltd | Wholesale & retail | 2017 |
| Daigiabao Ltd | Other services | 2025 |
| Daily Perfect Service Ltd | Other services | 2020 |
| Daish's Abbey Lawn Ltd | Hospitality | 2020 |
| Daish's Blackpool Hotel Ltd | Hospitality | 2018 |
| Daish's Coaches Limited | Transport & logistics | 1998 |
| Daish's County Hotel Ltd | Hospitality | 2018 |
| Daish's Durley Dean Hotel Ltd | Hospitality | 2024 |
| Daish's Esplanade Hotel Ltd | Hospitality | 2020 |
| Daish's Group Limited | Professional & scientific | 2012 |
| Daish's Holidays Limited | Administrative & support | 1994 |
| Daish's Imperial Hotel Ltd | Hospitality | 2020 |
| Daish's Regent Hotel Ltd | Hospitality | 2013 |
| Daish's Robinsons Ltd | Transport & logistics | 2020 |
| Daish's Russell Hotel Ltd | Hospitality | 2016 |
| Daish's Sandringham Hotel Ltd | Hospitality | 2024 |
| Daish's Somerset Hotel Limited | Hospitality | 2013 |
| Daisy Chain Commercial Cleaning Limited | Administrative & support | 2009 |
| Daisy Digs IT Limited | Information & communication | 2019 |
| Daisy Investment Holdings Ltd | Real estate | 2019 |
| DAJ Assets Ltd | Real estate | 2016 |
| DAL Productions Limited | Extraterritorial | 2018 |
| Dalkeith Management Ltd | Households | 2024 |
| DALTI04 Limited | Construction | 2023 |
| Dalton Duffy Property Ltd | Hospitality | 2017 |
| Damascus Delivery Ltd | Transport & logistics | 2025 |
| Damian Properties Ltd | Real estate | 2026 |