| Cygnet Hospitals Holdings Limited | Health & social care | 2003 |
| Cygnet Inter-Holdings Limited | Health & social care | 2008 |
| Cygnet Learning Disabilities Limited | Health & social care | 1987 |
| Cygnet Learning Disabilities Midlands Limited | Health & social care | 1991 |
| Cygnet Media Ltd | Other services | 2018 |
| Cygnet Newton House Limited | Health & social care | 1986 |
| Cygnet NW Limited | Health & social care | 2000 |
| Cygnet Propco Holdco II Limited | Health & social care | 2008 |
| Cygnet Propco Holdco Limited | Health & social care | 2007 |
| Cygnet Propco II Limited | Health & social care | 2008 |
| Cygnet Propco Limited | Health & social care | 2007 |
| Cygnet Surrey Limited | Health & social care | 2002 |
| D & L Carpentry Ltd | Construction | 2017 |
| D and N Group Holdings Limited | Real estate | 2018 |
| D Banfield Commercial Services Ltd | Administrative & support | 2020 |
| D Commissioning Services Ltd | Construction | 2012 |
| D M Jones Ltd | Construction | 2012 |
| D R 4 Developments LLP | | 2017 |
| D&S South East Ltd | Construction | 2016 |
| D-17 Logistics Ltd | Transport & logistics | 2017 |
| D-Mandgen Limited | Information & communication | 2023 |
| D.M.C TM Ltd | Construction | 2019 |
| D1 Decking Solutions Ltd | Construction | 2021 |
| D2 Medics Limited | Health & social care | 2018 |
| DAG Plumbing Services Ltd | Construction | 2010 |
| Dagan Investments Limited | Real estate | 2022 |
| Dalemoor Ltd | Professional & scientific | 2023 |
| DAN Lane AKA Mechanica Limited | Arts & recreation | 2014 |
| Dand Doctor Ltd | Health & social care | 2020 |
| Dane LEE Carpentry Services Limited | Construction | 2002 |
| Daniel Attwell Decorators Ltd | Construction | 2022 |
| Darcy Court (Maidstone) Flat Management Company Limited | Households | 2013 |
| Darryl Smith Ltd | Wholesale & retail | 2012 |
| Davelley Properties Limited | Real estate | 2021 |
| David Whitfield Ltd | Administrative & support | 2013 |
| Dawn to Dusk Day Nursery (Maidstone) Ltd | Education | 2004 |
| Dayturn Limited | Real estate | 1989 |
| Dazzlink Air Limited | Professional & scientific | 1995 |
| DCS Roofing Limited | Construction | 2011 |
| Ddnc Partners LLP | | 2020 |
| DE Havilland Place (Kings Hill) Management Company Limited | Real estate | 2022 |
| Deaconsulting Ltd | Information & communication | 2020 |
| Deal by Sea Limited | Hospitality | 2014 |
| Decade Ltd | Real estate | 2003 |
| Deezeejax Limited | Construction | 2018 |
| Defined Lines Limited | Other services | 2018 |
| Deia Collective Limited | Households | 2023 |
| Delaware Blue Limited | Extraterritorial | 2022 |
| Den-T-Sar Ltd | Health & social care | 2009 |
| Dentizt DEN Limited | Information & communication | 2025 |
| Dermadent Supplies Ltd | Wholesale & retail | 2023 |
| Detling Coach House LLP | | 2011 |
| Devine Works Limited | Construction | 2022 |
| Dhrithi Consulting Limited | Information & communication | 2017 |
| Diamond CUT Bathrooms Ltd | Construction | 2024 |
| Diamond Decorators South East Limited | Construction | 2026 |
| Digby Fabrication Ltd | Manufacturing | 2019 |
| Digital Purpose Ltd | Professional & scientific | 2019 |
| Digital Risk Aware Limited | Information & communication | 2023 |
| Diligent Law Limited | Professional & scientific | 2014 |
| Direct Marketing Consulting Ltd | Information & communication | 2018 |
| Discologic Events Ltd | Hospitality | 2020 |
| Discologic Ltd | Arts & recreation | 2013 |
| Discount Roofing Merchants Ltd | Construction | 2018 |
| Djconstruction Ltd | Construction | 2025 |
| DK Roofing & Building Limited | Construction | 2024 |
| DKL Projects & Property Management Ltd | Real estate | 2016 |
| Dknight&Co Ltd | Construction | 2024 |
| Dmax Building Ltd | Construction | 2020 |
| DMH Electrical Contractors Limited | Construction | 2015 |
| Dolager Resource Solutions Limited | Financial services | 2023 |
| Domaine Music Projects CIC | Education | 2023 |
| Dominic Paul Cosmetics Ltd | Wholesale & retail | 2019 |
| Dormy Homes Limited | Real estate | 2019 |
| Dorset & Kent Commercial Services LLP | | 2023 |
| Doublebight Limited | Professional & scientific | 2025 |
| Douces Manor Property Holdings Limited | Real estate | 2013 |
| Downsview (Snodland) Limited | Health & social care | 1989 |
| DR Focus Ltd | Administrative & support | 2017 |
| DR Mburu Limited | Real estate | 2011 |
| DR Raquel Skin & Medical Cosmetics Limited | Health & social care | 2019 |
| DR. Doris Anti-Ageing Clinic Limited | Health & social care | 2018 |
| DR. Doris Ltd | Health & social care | 2019 |
| DR. Doris Medical Aesthetics Limited | Wholesale & retail | 2019 |
| DR. Kumar Ecoexpert Limited | Professional & scientific | 1998 |
| Drains & Mains Ltd | Water & waste | 2021 |
| Drawdove Limited | Extraterritorial | 1983 |
| Dressed by DEE Limited | Wholesale & retail | 2018 |
| Driverbookings Limited | Administrative & support | 2021 |
| Drovers Way Residents Management Company Limited | Households | 2017 |
| Dryden Court (Freehold) Limited | Households | 1996 |
| Dryden Court (Trustees) Limited | Households | 2004 |
| DSM Squared Ltd | Administrative & support | 2019 |
| Dudley & Kent Commercial Services Ltd | Administrative & support | 2022 |
| Dunview Limited | Professional & scientific | 2006 |
| Durant Reward Consultancy Limited | Administrative & support | 2009 |
| Dwell Interiors Limited | Wholesale & retail | 2019 |
| DWH Consulting (Kent) Limited | Construction | 2016 |
| DWL Print and Design Limited | Manufacturing | 2006 |
| Dynamo Recoveries Limited | Professional & scientific | 2021 |