| Crunchwell Services Ltd | Professional & scientific | 2004 |
| Crusader Trust and Tax Services Limited | Professional & scientific | 2024 |
| Crypto Taxation Limited | Professional & scientific | 2023 |
| CSI Biosphera Sapi International Limited | Energy | 2023 |
| CSI Biosphera Sapi Limited | Energy | 2023 |
| CSK & RAI Ltd | Health & social care | 2026 |
| CST Paving Landscapes Limited | Construction | 2025 |
| CUE Masters UK Limited | Arts & recreation | 2016 |
| Cultured.Eats Ltd | Hospitality | 2018 |
| Cumbria Internet Services Limited | Professional & scientific | 1995 |
| Custodia Investments Limited | Financial services | 2025 |
| Cyclism Ltd | Arts & recreation | 2015 |
| D a J Scenic Painter Ltd | Other services | 2017 |
| D C Flooring (UK) Limited | Construction | 2009 |
| D J Bathrooms & Property Maintenance Ltd | Construction | 2018 |
| D L Maintenance Ltd | Administrative & support | 2024 |
| D M Logistics and Training Limited | Administrative & support | 2010 |
| D&S Employment Limited | Administrative & support | 2022 |
| D&S Haulage Limited | Transport & logistics | 2017 |
| D'Arcy Chapel Limited | Extraterritorial | 2020 |
| D.C.Emergency Systems Limited | Other services | 1983 |
| D.S. Engineering (Witham) Limited | Manufacturing | 2003 |
| D.S.H. Magill Limited | Administrative & support | 2014 |
| D9 Services Limited | Wholesale & retail | 2017 |
| Daci Holdings Limited | Real estate | 2024 |
| Dacia Construction Ltd | Construction | 2023 |
| Daman of Witham Ltd. | Wholesale & retail | 2002 |
| Danbury Fencing Installations Ltd | Construction | 2020 |
| Darcy RD Management Co Ltd | Households | 2022 |
| Daron Edwards Carpentry Ltd | Manufacturing | 2024 |
| Dartford Trading Ltd | Wholesale & retail | 2015 |
| Dashwood Print (UK) Limited | Manufacturing | 2007 |
| Datum Aviation Ltd | Transport & logistics | 2026 |
| Dave Hodgson Ltd | Professional & scientific | 2024 |
| David Sharman Homes Limited | Real estate | 2016 |
| Davis and Davis Properties Limited | Real estate | 2014 |
| Davonport Holdings Limited | Financial services | 2018 |
| Day+One Limited | Manufacturing | 1997 |
| DB Advisor Services Ltd | Professional & scientific | 2018 |
| DC Fire & Security (Essex) Limited | Administrative & support | 2025 |
| DC Smart Logistics Ltd | Manufacturing | 2022 |
| DCF Group Ltd | Extraterritorial | 2022 |
| DD Group Holdings Ltd | Professional & scientific | 2012 |
| DD Products and Services Ltd | Wholesale & retail | 1975 |
| Dead Genetic Limited | Information & communication | 2023 |
| Decor Finds Ltd | Information & communication | 2025 |
| Decor Vibes Ltd | Wholesale & retail | 2023 |
| Deepin Wellness Ltd | Health & social care | 2025 |
| Delivery & Distribution Solutions Limited | Transport & logistics | 2014 |
| Delta Barber Ltd | Other services | 2025 |
| Denholm Court (Witham) Residents Association Limited | Households | 1988 |
| Denvify Ltd | Manufacturing | 2026 |
| Derbyshire Internet Services Limited | Professional & scientific | 1995 |
| Dersim Function Room Ltd | Hospitality | 2025 |
| Desiato Limited | Information & communication | 2015 |
| Detoxpeople Ltd. | Manufacturing | 2010 |
| Devon Internet Services Limited | Professional & scientific | 1995 |
| DG Timberframe Ltd | Construction | 2023 |
| Dgks Properties Limited | Real estate | 2017 |
| Dhani UK Holdings Limited | Construction | 2022 |
| Dice Contracts Ltd | Construction | 2025 |
| Diet PEN Ltd | Professional & scientific | 2022 |
| Digital Privileged Identity Consultancy Ltd | Information & communication | 2017 |
| Dingle Group Ltd | Construction | 2024 |
| Dingle Hire Services Limited | Extraterritorial | 2024 |
| Dingle Plant & Tool Repair Ltd | Construction | 2026 |
| Dingle Supplies Limited | Extraterritorial | 2024 |
| Dingley Dell Cured Limited | Manufacturing | 2018 |
| Direct Consolidated Limited | Financial services | 2013 |
| Direct Holdings Limited | Professional & scientific | 2002 |
| Direct Meats (Knights Farm) Ltd | Manufacturing | 1995 |
| Direct Memorials (UK) Limited | Other services | 1994 |
| Direct Transportation Limited | Construction | 2002 |
| DIRECT24 - Maintenance Ltd | Construction | 2024 |
| DIY Detail Limited | Administrative & support | 2026 |
| DJ Consultant Services Ltd | Information & communication | 2022 |
| DJC Panther Property Ltd | Real estate | 2021 |
| Djmpower Ltd | Construction | 2025 |
| DJP Fire Ltd | Professional & scientific | 2011 |
| DJW Construction Limited | Construction | 1989 |
| DLM Freeholds Ltd | Real estate | 2025 |
| DMD Management Services Limited | Professional & scientific | 2001 |
| DNH Enterprises Ltd | Financial services | 2025 |
| DNS International Limited | Wholesale & retail | 2017 |
| Doctor GKS Limited | Health & social care | 2011 |
| Doel Engineering Limited | Manufacturing | 1974 |
| Doel Holdings Limited | Financial services | 2003 |
| Dometic UK Awnings Ltd | Wholesale & retail | 2006 |
| Domsey Chase Limited | Financial services | 2014 |
| Door Window Repairs Ltd | Manufacturing | 2022 |
| Dormaseat Limited | Real estate | 2007 |
| Dorset Internet Services Limited | Professional & scientific | 1995 |
| DOT4DOT Electrical Ltd | Construction | 2014 |
| Dotsal Ltd | Information & communication | 2005 |
| Dotsal Properties UK Ltd | Real estate | 2022 |
| Dotspeed Limited | Hospitality | 2002 |
| DR Glancey Clinics Limited | Health & social care | 2013 |
| DR Logistics Group Limited | Professional & scientific | 2019 |
| DRA Create Ltd | Professional & scientific | 2012 |
| DRH Landscapes Limited | Administrative & support | 2012 |