| Darv Ltd | Construction | 2018 |
| Darze Ltd | Construction | 2025 |
| Darzz Ltd | Real estate | 2018 |
| Dashwood Care Limited | Health & social care | 2025 |
| Dashwoods Accountants Limited | Professional & scientific | 2018 |
| Dashwoods Limited | Extraterritorial | 2020 |
| Dass Marketing Limited | Information & communication | 2008 |
| Data Directive Limited | Administrative & support | 2017 |
| Data Pigments Ltd | Information & communication | 2020 |
| Datafields Ltd | Information & communication | 2006 |
| Dataganix Ltd | Information & communication | 2025 |
| Datalogyc Limited | Information & communication | 2025 |
| Dataspinners Ltd | Information & communication | 2016 |
| Datavigil Consultancy Ltd | Information & communication | 2026 |
| Dataville Limited | Professional & scientific | 1993 |
| Dataware Ltd | Information & communication | 2019 |
| Date in the Diary Ltd | Other services | 2021 |
| DAV Rental Ltd | Real estate | 2025 |
| Dave Does Limited | Information & communication | 2015 |
| Dave Lewis Ltd | Information & communication | 2012 |
| Dave Reeves Landscaping Limited | Administrative & support | 2016 |
| Dave Smart Contracts Limited | Transport & logistics | 1985 |
| David Anderson Golf Ltd | Arts & recreation | 2024 |
| David Bray Plumbing & Heating Limited | Construction | 2011 |
| David Capehorn Tiling Ltd | Construction | 2015 |
| David J Palmer Limited | Information & communication | 2012 |
| David Mizzi Construction Ltd | Construction | 2011 |
| David Wilson Consultants Limited | Professional & scientific | 2007 |
| David Your Mobile Mechanic Repairs& Service Best Prices Ltd | Wholesale & retail | 2023 |
| David&Bebecca Ltd | Construction | 2016 |
| David-Antonia Services Ltd | Transport & logistics | 2022 |
| Davies & White Ltd | Real estate | 2023 |
| Davis and Associates Consultancy Ltd | Professional & scientific | 2019 |
| Davison Highley Limited | Manufacturing | 1979 |
| Davtom Windows Ltd | Construction | 2023 |
| Dawn Fire Limited | Manufacturing | 1998 |
| Dawn's Designer Flowers Limited | Wholesale & retail | 2006 |
| Daws Hill Consultancy Ltd | Professional & scientific | 2016 |
| Daws Hill IT Solutions Limited | Information & communication | 2025 |
| Dawsons Hair & Beauty Lounge Limited | Other services | 2019 |
| Day & Knight Bespoke Fitted Furniture Limited | Manufacturing | 2022 |
| Dayi 27 Limited | Hospitality | 2025 |
| Daypict Ltd | Information & communication | 2008 |
| Daywise Court RTM Company Limited | Households | 2020 |
| DB Performance Solutions Limited | Information & communication | 2013 |
| DB Window Cleaners Limited | Administrative & support | 2023 |
| Dbboy Ltd | Construction | 2021 |
| Dbuk Limited | Information & communication | 2025 |
| DC Diamonds Co Ltd | Wholesale & retail | 2025 |
| DC Property Lettings Ltd | Hospitality | 2022 |
| DCB Electrical Limited | Construction | 2014 |
| DCP (1976) Ltd | Arts & recreation | 2021 |
| DCR Property Services Ltd | Construction | 2014 |
| DCU Logistic Ltd | Transport & logistics | 2019 |
| DD Carpentry Ltd | Construction | 2016 |
| DE Blanc Development Consultants Ltd | Professional & scientific | 2017 |
| DE ES Consulting Ltd | Information & communication | 2023 |
| De-London Consult Limited | Information & communication | 2012 |
| De-Stressed Leather Ltd | Wholesale & retail | 2025 |
| DEA & LEO Ltd | Wholesale & retail | 2023 |
| Deadly Limited | Information & communication | 2016 |
| Deal SET Go Ltd | Wholesale & retail | 2020 |
| Deal SET Go Transport Ltd | Transport & logistics | 2023 |
| Dealcove Limited | Wholesale & retail | 2025 |
| Dean Interiors Limited | Construction | 2001 |
| Dean Spencer Builders & Demolition Limited | | 1979 |
| Dean Valley Limited | Real estate | 2012 |
| Deanfield (Charlbury) Management Company Limited | Households | 2025 |
| Deanfield (Ducklington) Management Company Limited | Households | 2017 |
| Deanfield (Hermitage) Development Company Limited | Real estate | 2025 |
| Deanfield (Tackley) Management Company Limited | Households | 2018 |
| Deanfield (Wexham) Development Company Limited | Real estate | 2025 |
| Deanfield Homes Limited | Construction | 2016 |
| Dear FK Ltd | Wholesale & retail | 2025 |
| Dearne Valley Business Centre Ltd | Real estate | 2016 |
| Death Doula Ltd | Health & social care | 2026 |
| Debbie Care Ltd | Health & social care | 2023 |
| Debbie Inglis Ltd | Administrative & support | 2015 |
| Debole Consulting Ltd | Information & communication | 2018 |
| Decision House Ltd | Professional & scientific | 2012 |
| Deen Quest Ltd | Wholesale & retail | 2025 |
| Deep Thames Solutions Ltd | Transport & logistics | 2026 |
| Deepstack Learning Ltd | Education | 2026 |
| Deeter Electronics Ltd. | Manufacturing | 1991 |
| Deeter Engineering Services Limited | Manufacturing | 1982 |
| Defensive Operations Group Limited | Administrative & support | 2025 |
| Defeqt Ltd | Professional & scientific | 2020 |
| Definitive Consultancy Limited | Information & communication | 1998 |
| Deinoda Ltd | Administrative & support | 2022 |
| Dejac Associates Limited | Information & communication | 1998 |
| Dekay Limited | Other services | 2016 |
| Dekel Engineering Solutions Ltd | Professional & scientific | 2025 |
| Delbrid Ltd | Real estate | 2021 |
| Delight 3 Limited | Hospitality | 2018 |
| Delight Entertainment Limited | Arts & recreation | 2024 |
| Delight Green F a Limited | Hospitality | 2020 |
| Delivered (Reading) Ltd. | Transport & logistics | 2001 |
| Delivered Portsmouth Ltd | Transport & logistics | 2020 |
| Delivered UK Ltd | Transport & logistics | 1982 |
| Delivery Blueprints Ltd | Information & communication | 2009 |