| Crew of Patches Theatre Company Ltd | Arts & recreation | 2023 |
| CRJ Track Services UK Limited | Construction | 2015 |
| CRM Construction Consultancy Ltd | Other services | 2017 |
| Crocodile Tears Tattoos and Vapes Ltd | Arts & recreation | 2025 |
| Crossfield Studio Ltd | Information & communication | 2025 |
| Crow Wood Properties Limited | Real estate | 2022 |
| Cryozone Limited | Administrative & support | 2016 |
| CS Licensed Property Solutions Ltd | Professional & scientific | 2020 |
| CSB Transport Limited | Transport & logistics | 2012 |
| CSG Compliance Management Limited | Transport & logistics | 2024 |
| Csols Labs Ltd | Information & communication | 2017 |
| Csols Limited | Information & communication | 2000 |
| CT Aeromech 73 Ltd | Administrative & support | 2016 |
| CTS Driver Hire Ltd | Transport & logistics | 2024 |
| CUT and Green Ltd | Wholesale & retail | 2026 |
| Cypex Transport Ltd | Transport & logistics | 2017 |
| D & D Fabrications (Runcorn) Limited | Manufacturing | 1978 |
| D and C Industrial Roofing Ltd | Construction | 2022 |
| D D Components Limited | Manufacturing | 2018 |
| D H & N Ltd | Transport & logistics | 2025 |
| D H M Detailing Ltd | Construction | 2014 |
| D&S Ultra-Clean Holdings Ltd | Financial services | 2020 |
| D&S Ultra-Clean Ltd | Manufacturing | 2001 |
| D.C. Holdings (UK) Ltd | Construction | 1982 |
| D.J. Property Management Limited | Real estate | 2006 |
| D.S.S.Marketing Limited | Administrative & support | 2009 |
| D67 Properties Ltd | Real estate | 2022 |
| DA First Ltd | Administrative & support | 2015 |
| Da&Sons Construction Ltd | Construction | 2026 |
| Dale Spiral Systems & Bakery Automation Ltd | Manufacturing | 2003 |
| Dangerous Goods Training Limited | Professional & scientific | 1997 |
| Danom Engineering Ltd | Manufacturing | 2011 |
| Daresbrook Ltd | Other services | 2016 |
| Darshaki Limited | Wholesale & retail | 2023 |
| DAS Exim Ltd | Wholesale & retail | 2025 |
| David Olaru 2013 Ltd | Transport & logistics | 2015 |
| David Williams (Haulage Services) Ltd | Transport & logistics | 2009 |
| Davies Office Management Limited | Professional & scientific | 2023 |
| Dawnstar Gaming CIC | Arts & recreation | 2023 |
| Dazlew Electrical Ltd | Construction | 2021 |
| DB Constructions & SON Ltd | Construction | 2026 |
| DC Leisure Group Ltd | Manufacturing | 2019 |
| DC21 Logistics Ltd | Transport & logistics | 2026 |
| DCB Legal Ltd | Administrative & support | 2017 |
| DCG Development Limited | Real estate | 2019 |
| Dcrr Limited | Hospitality | 2015 |
| DE Maria Godinho Admin Ltd | Construction | 2024 |
| DE Maria Menezes Limited | Construction | 2024 |
| Deadman’S Kitchen Ltd | Hospitality | 2025 |
| Deblasio Industries Limited | Other services | 2018 |
| Decanting UK Ltd | Transport & logistics | 2026 |
| Defonseka Ltd | Real estate | 2021 |
| Delamere Joinery Ltd | Construction | 2025 |
| DELIVERY4U Logistics Limited | Transport & logistics | 2021 |
| Delta Mech Engineering Limited | Professional & scientific | 2026 |
| Dendrite Labs Ltd | Information & communication | 2015 |
| Deranged Games Ltd | Information & communication | 2025 |
| Derek Parsonage Ltd | Administrative & support | 2017 |
| Design by Atom Ltd | Professional & scientific | 2019 |
| Design by IG Limited | Manufacturing | 2018 |
| DESIGN3:16 Ltd | Wholesale & retail | 2023 |
| Deva Medical Electronics Limited | Health & social care | 1981 |
| Devil Design (UK) Limited | Information & communication | 2013 |
| Devine Developers Ltd | Information & communication | 2022 |
| Dexter and Jones Enterprises Limited | Hospitality | 2026 |
| DH Management & Building Services Limited | Construction | 2015 |
| Di-Tec Group Ltd | Manufacturing | 2016 |
| Diamond Leaflet Services Limited | Professional & scientific | 2026 |
| Diat Ltd | Professional & scientific | 2021 |
| Dillon Electrical Services Ltd | Construction | 2016 |
| Dillon Property Services Ltd | Real estate | 2021 |
| Direct Bark Mulch (SPV) Ltd | Wholesale & retail | 2026 |
| Direct Collection Bailiffs Ltd | Professional & scientific | 2010 |
| Direct Maintenance and Repair Ltd | Construction | 2025 |
| Discount Imports Ltd | Wholesale & retail | 2023 |
| Distinctive Group Holdings Ltd | Financial services | 2024 |
| DJ Oils Ltd | Manufacturing | 2007 |
| DJB Asset Finance Ltd | Financial services | 2015 |
| DJB Business Finance Ltd | Financial services | 2020 |
| DJB Finance & Leasing Limited | Financial services | 2013 |
| DJM Group Ltd | Information & communication | 2025 |
| DJM Service Provider Ltd | Transport & logistics | 2025 |
| DJR Roofing and Building Limited | Construction | 2019 |
| Dl-Med Limited | Real estate | 2026 |
| DLC Electrical Services Ltd | Construction | 2023 |
| DLD Wellbeing Limited | Health & social care | 2025 |
| Dlda Productions Limited | Education | 2025 |
| DLM Plumbing & GAS Ltd | Construction | 2025 |
| Dltex Ltd | Professional & scientific | 2014 |
| DMD Design Solutions Ltd | Professional & scientific | 2023 |
| DMI Catering Limited | Hospitality | 2025 |
| DMI Hospitality Limited | Hospitality | 2025 |
| DMS Innovations Ltd | Professional & scientific | 2011 |
| Doctor Divergent Ltd | Health & social care | 2025 |
| Dodd's Engineering Consultancy Ltd | Professional & scientific | 2014 |
| Dolce by Daniela Ltd | Hospitality | 2026 |
| Dolphin Financial Limited | Financial services | 2017 |
| Dolphin Residential Limited | Real estate | 2022 |
| Dolphin Residential Property Limited | Real estate | 2026 |
| Domestic Roller Shutters Ltd | Manufacturing | 2006 |