| Darsrim Solutions Limited | Information & communication | 2025 |
| Darward Properties Ltd | Real estate | 2022 |
| Dascom GB Limited | Wholesale & retail | 2009 |
| Dash Together Ltd | Arts & recreation | 2025 |
| DAT Gym Ltd | Arts & recreation | 2025 |
| Data Motion Ltd | Information & communication | 2020 |
| Data Tale Corporation Limited | Information & communication | 2025 |
| Datakom Limited | Information & communication | 2007 |
| Datan Limited | Professional & scientific | 1991 |
| Datapulse Consulting Limited | Information & communication | 2024 |
| Datatech S.C. Limited | Information & communication | 1998 |
| Datewell Limited | Hospitality | 2017 |
| Datrim Solutions Limited | Information & communication | 2008 |
| Datts Ltd | Arts & recreation | 2023 |
| Daval Limited | Information & communication | 1998 |
| Dave Watson Property Services Limited | Administrative & support | 2013 |
| David Craig Properties Limited | Real estate | 2017 |
| David Cudmore Limited | Professional & scientific | 2023 |
| David Gregory Drylining Limited | Construction | 2018 |
| David Michael Watson Associates Limited | Professional & scientific | 2014 |
| David Trans 78 Ltd | Transport & logistics | 2019 |
| Davidus Building Services Ltd | Construction | 2019 |
| Davis Plumbing Group Limited | Construction | 2022 |
| DAX Air Aviation Limited | Transport & logistics | 2023 |
| Day Dream Nurseries Limited | Education | 2000 |
| DAY443 Ltd | Information & communication | 2026 |
| Daya Engineering Ltd | Professional & scientific | 2017 |
| Dayout Limited | Health & social care | 2013 |
| Dazzle Lettings Limited | Real estate | 2014 |
| Dbja Ltd | Construction | 2024 |
| DBM Group Holdings Ltd | Financial services | 2025 |
| DC Carpentry & Renovation Limited | Construction | 2023 |
| DC Water Ltd | Water & waste | 2023 |
| Dcnetworks Group Ltd | Information & communication | 2026 |
| DCS Logistics Ltd | Transport & logistics | 2026 |
| DCS Projects Ltd | Construction | 2024 |
| DCS Voice & Vision Limited | Information & communication | 2002 |
| Dcsales Electronics Limited | Wholesale & retail | 2018 |
| Dcvh Capital Ltd | Financial services | 2026 |
| DD Mailing Group Limited | Professional & scientific | 2010 |
| DD4CASABLANCA Ltd | Real estate | 2022 |
| DD4DRIVE Limited | Transport & logistics | 2014 |
| DDG Marketing Ltd | Wholesale & retail | 2022 |
| DDI Trans Ltd | Transport & logistics | 2025 |
| DDL Logistics Ltd | Transport & logistics | 2019 |
| DE LA RUE Healthcare Trustee Limited | Administrative & support | 2004 |
| DE LA RUE International Limited. | Manufacturing | 1962 |
| DE LA RUE Investments Limited | Financial services | 1990 |
| DE LA RUE Limited | Manufacturing | 1999 |
| DE LA RUE Overseas Limited | Professional & scientific | 1939 |
| DE LA RUE Pension Trustee Limited | Administrative & support | 1997 |
| DE Way Ltd | Wholesale & retail | 2023 |
| De-Cloud Health Ltd | Health & social care | 2023 |
| Deacon Schmidt Properties Ltd | Construction | 2025 |
| Deadbolt Media Limited | Information & communication | 2024 |
| Dean Valley Project Consultants Limited | Wholesale & retail | 2022 |
| Dean Wyles VFX Ltd | Information & communication | 2023 |
| Deanbrook Practice Limited | Health & social care | 2023 |
| Debtech Ltd | Professional & scientific | 2017 |
| Deca Environmental Services Ltd | Professional & scientific | 2019 |
| Decart Holdings Ltd | Wholesale & retail | 2022 |
| Dechen & Co Limited | Wholesale & retail | 2024 |
| Decimal Studios Ltd | Manufacturing | 2024 |
| Decorshades Europe Limited | Manufacturing | 2012 |
| Decorus Ltd | Information & communication | 2001 |
| DEE ETL Professional Ltd | Information & communication | 2023 |
| Dee's Beauty Salon Ltd | Other services | 2021 |
| DEE4MULA Limited | Professional & scientific | 2018 |
| Deejay Soft Ltd | Information & communication | 2013 |
| Deep Rooted Community Gardens CIC | Administrative & support | 2026 |
| Deep Tach Consultancy Limited | Administrative & support | 2006 |
| Deer Engineering Limited | Professional & scientific | 2018 |
| Deer Limited | Administrative & support | 2018 |
| Dees Bar Ltd | Hospitality | 2025 |
| Defence Power Systems Limited | Extraterritorial | 2017 |
| Defini Limited | Professional & scientific | 2025 |
| Degreba Logistics Limited | Transport & logistics | 2025 |
| Delah UK Limited | Real estate | 2022 |
| Delhi Brothers Limited | Hospitality | 2014 |
| Delightful Fragrances Ltd | Wholesale & retail | 2023 |
| Delilah’S Dreamy Designs Ltd | Wholesale & retail | 2024 |
| Delphon Ltd | Information & communication | 2025 |
| Delt Limited | Professional & scientific | 2011 |
| Delta Cars Basingstoke Ltd | Transport & logistics | 2019 |
| Delta Clinical Group Ltd | Professional & scientific | 2024 |
| Delta Europa Limited | Manufacturing | 2023 |
| Deluxe Materials Ltd | Manufacturing | 2010 |
| Delves Court Care Home Ltd. | Health & social care | 2015 |
| Denaclean Ltd | Administrative & support | 2022 |
| Denali Bidco Limited | Financial services | 2023 |
| Denali Holdco 2 Limited | Financial services | 2025 |
| Denali Holdco Limited | Financial services | 2023 |
| Denali Midco Limited | Financial services | 2023 |
| Denis DS Ltd | Transport & logistics | 2020 |
| Denis Technologies Limited | Information & communication | 2020 |
| Denis U.K. Limited | Financial services | 2007 |
| Dennis Coaching Limited | Arts & recreation | 2025 |
| Dental Training Limited | Education | 2012 |
| Dentamix Ltd | Health & social care | 2008 |
| Dependable Decorating Ltd | Construction | 2023 |