| CTC Clinical Services Ltd | Education | 2017 |
| Ctrphotography Ltd | Wholesale & retail | 2019 |
| Cube Bikes UK Ltd | Administrative & support | 2008 |
| Cube Fleet Solutions Ltd | Transport & logistics | 2019 |
| Cubestores UK Ltd | Extraterritorial | 2019 |
| Cudal Limited | Health & social care | 2015 |
| Cudal Property Limited | Real estate | 2016 |
| Cullinan & Associates Ltd | Hospitality | 2026 |
| Cullumgate Management Company Limited | Real estate | 2015 |
| Cunninghams Autocare and Recovery Ltd | Wholesale & retail | 2019 |
| Cura Capital Limited | Financial services | 2023 |
| Curr Lane Limited | Construction | 2020 |
| Current Innovation Electrical Services Ltd | Construction | 2024 |
| Custom Carpentry Services Ltd | Manufacturing | 2025 |
| Custom Electrical Solutions Limited | Construction | 2009 |
| Custom Hose and Bellows Ltd | Manufacturing | 2026 |
| Custom Power Limited | Extraterritorial | 2021 |
| Custom Signwriting Limited | Professional & scientific | 2024 |
| Cybacat Ltd | Information & communication | 2005 |
| Cyclade Holdings Ltd | Real estate | 2021 |
| D & D Barton Ltd | Professional & scientific | 2015 |
| D & D Properties (Surrey) Limited | Real estate | 2006 |
| D & K Europe Limited | Manufacturing | 1987 |
| D & S Rewinds Ltd | Manufacturing | 2022 |
| D & W Minshall Ltd | Administrative & support | 2011 |
| D C Plumbing & Heating (West Midlands) Ltd | Construction | 2017 |
| D Henderson Ltd | Administrative & support | 2023 |
| D K Learning Connections Ltd | Education | 2018 |
| D N B Roofing Limited | Construction | 2016 |
| D T Hunt Limited | Health & social care | 2025 |
| D&D Roofing and Damp Proofing Supplies Limited | Construction | 2018 |
| D&D Roofing and Damp Proofing Specialist Limited | Construction | 2018 |
| D&D Roofing Specialist Ltd | Construction | 2024 |
| D&T Team Ltd | Administrative & support | 2020 |
| D&W Momentum Limited | Real estate | 2024 |
| D'Mello PIP Limited | Real estate | 2026 |
| D. O. Installations Ltd | Construction | 2022 |
| D.A.S Civils Ltd | Construction | 2019 |
| D.E. & A.C. Hill (Contractors) Limited | Construction | 1975 |
| D.F. Investments (Midlands) Holdings Limited | Professional & scientific | 1991 |
| D.F. Investments (Midlands) Limited | Real estate | 1983 |
| D.J.S Heating and Plumbing Ltd | Construction | 2024 |
| D.L.P GAS Systems Ltd | Energy | 2011 |
| DA Training & Performance Limited | Arts & recreation | 2016 |
| DAC Supplies Limited | Wholesale & retail | 2020 |
| DAG Financial Solutions Ltd | Financial services | 2013 |
| Dakoity Holdings Limited | Extraterritorial | 2009 |
| Dakoity Limited | Construction | 1973 |
| Dale - Harris & Co. Ltd | Professional & scientific | 2010 |
| Dale Property Ltd | Households | 2019 |
| Dalia-Ariana Ltd | Transport & logistics | 2019 |
| Dallas Consultancy Limited | Administrative & support | 2020 |
| Dalloway Consulting Limited | Health & social care | 2011 |
| Damicons Ltd | Construction | 2023 |
| DAN Dan's Collectables Ltd | Wholesale & retail | 2026 |
| DAN Hemming Architecture Ltd | Professional & scientific | 2025 |
| Dan's Cabs Limited | Transport & logistics | 2024 |
| Dance Wellbeing Limited | Wholesale & retail | 2021 |
| Dangerous Designs Limited | Construction | 2006 |
| Daniel Cavey Plumbing Ltd | Construction | 2025 |
| Daniel Ellis Roofing Limited | Construction | 2019 |
| Daniel Whitehouse Limited | Administrative & support | 2013 |
| Danish Property Ltd | Real estate | 2024 |
| Danutek Limited | Extraterritorial | 2021 |
| DAP Building Contractors Limited | Construction | 2016 |
| Darcy Architects Limited | Professional & scientific | 2018 |
| Darefield Limited | Real estate | 2023 |
| Dark Moth Limited | Professional & scientific | 2015 |
| Darkspire Ltd | Manufacturing | 2026 |
| Darren Darby Limited | Other services | 2003 |
| Darren Yates Painting and Decorating Ltd | Construction | 2025 |
| Dash Motor Services Limited | Wholesale & retail | 2018 |
| Dash Motor Services Studley Limited | Wholesale & retail | 2024 |
| Dash Recruitment Limited | Administrative & support | 2017 |
| Data Heads (Data Marketing) Ltd | Information & communication | 2013 |
| Datgas Ltd | Construction | 2019 |
| Daverns Taverns Limited | Hospitality | 2009 |
| David and Sons Removals and Storage Ltd | Transport & logistics | 2018 |
| David Gerald Sportscars Ltd | Extraterritorial | 2014 |
| David Glen Roofing Limited | Construction | 2014 |
| David Hart (Saltway) Limited | Agriculture & fishing | 2014 |
| David Inman Colour Ltd | Other services | 2024 |
| David Lowe Music Limited | Arts & recreation | 1996 |
| Davies Archytas Accountants Limited | Professional & scientific | 2013 |
| Davies Mechanical Services Limited | Administrative & support | 1999 |
| Davies Pressings Limited | Administrative & support | 2019 |
| Davies Springs Limited | Manufacturing | 2003 |
| Davinci Furniture Limited | Wholesale & retail | 2023 |
| Davinci Specialist Beds Limited | Wholesale & retail | 2020 |
| Davis & Birch Limited | Construction | 2000 |
| Davis Construction & Engineering Ltd | Construction | 2021 |
| Davis Quarry Products Ltd. | Wholesale & retail | 1997 |
| Davturn Limited | Administrative & support | 2010 |
| Dawid Autorepair Ltd | Wholesale & retail | 2022 |
| DAX Electrical Limited | Construction | 2025 |
| DAX Energy Limited | Construction | 2025 |
| Dayle Construction Ltd | Water & waste | 2022 |
| Daysandnights Global Ltd | Health & social care | 2024 |
| Db.Therapist Limited | Health & social care | 2015 |
| DBL Properties Limited | Real estate | 2025 |