| D & L Entertainment Ltd. | Arts & recreation | 2009 |
| D & M Aeroconsulting Limited | Professional & scientific | 2016 |
| D a Jones Engineering Limited | Professional & scientific | 2007 |
| D F Press Limited | Professional & scientific | 2005 |
| D Hull Consultancy Limited | Professional & scientific | 2026 |
| D J Pipeworks Limited | Construction | 2021 |
| D P Ford Decorating Ltd | Construction | 2018 |
| D P Path Reporting Limited | Health & social care | 2015 |
| D S Construction Solutions Ltd | Construction | 2023 |
| D T Electrical (Southern) Limited | Construction | 2007 |
| D&B Consulting Ltd | Professional & scientific | 2015 |
| D&D Bevan Property Ltd | Real estate | 2024 |
| D&G UK Stone Installations Limited | Manufacturing | 2019 |
| D&N Fitzgerald Ltd | Real estate | 2024 |
| D&R Construction & Development Ltd | Real estate | 2020 |
| D-Ploy (UK) Ltd | Administrative & support | 2014 |
| D.A.G. Services Ltd | Construction | 2002 |
| D2L Ltd | Hospitality | 2023 |
| Daan Holdings Ltd | Financial services | 2025 |
| Daan Housing Ltd | Real estate | 2025 |
| DAB Digital Designs Limited | Professional & scientific | 2021 |
| DAC Homeworks Ltd | Real estate | 2016 |
| Dacha Property Management Limited | Extraterritorial | 2022 |
| Daisy Chain Exotics Ltd | Wholesale & retail | 2025 |
| Daisy Motor Group Limited | Real estate | 2021 |
| Dama Construction Limited | Construction | 2004 |
| DAN Germain Limited | Professional & scientific | 2012 |
| Dance Woking Ltd | Arts & recreation | 1994 |
| Dandelion Military Families CIC | Other services | 2023 |
| Daniel Gorin Ltd | Information & communication | 2021 |
| Danna Care Ltd | Health & social care | 2020 |
| Dans Bike Tyres Ltd | Wholesale & retail | 2025 |
| Dapple House Residents Association Limited | Households | 1984 |
| Darkmere Limited | Professional & scientific | 2023 |
| Darkstar London Limited | Administrative & support | 2013 |
| Darren & Lilia Dance Studio Limited | Arts & recreation | 2023 |
| Dassault Aviation Business Services UK, Ltd | Transport & logistics | 1991 |
| Data Ace Limited | Information & communication | 2009 |
| Data City Computers Ltd | Information & communication | 2007 |
| Data Design & Development Ltd | Information & communication | 2022 |
| Data Ocean Solutions Ltd | Information & communication | 2024 |
| Data Research Projects Group Limited | Information & communication | 2015 |
| Data Research Strategic Services Ltd | Information & communication | 2022 |
| Data Systems Management LLP | | 2014 |
| Datablend Ltd | Information & communication | 2022 |
| Datum Construction Farnham Ltd | Construction | 2019 |
| Datum Designs Ltd | Construction | 2025 |
| Davco Security Limited | Administrative & support | 1999 |
| Dave Cheeseman Roofing & Lead Work Specialists Limited | Construction | 2017 |
| Daveollie Property Maintenance Ltd | Construction | 2026 |
| Davey Developments Limited | Construction | 2000 |
| Davian Environmental Engineering Limited | Extraterritorial | 2024 |
| David Boakes Associates Limited | Professional & scientific | 2011 |
| David Seall Associates Limited | Administrative & support | 2010 |
| David Thorne Limited | Information & communication | 2016 |
| Dawyk Beech Guesthouse Limited | Hospitality | 2014 |
| DB Fleet Solutions Ltd | Wholesale & retail | 2026 |
| DBA Acoustics Limited | Other services | 2018 |
| Dcmn Marketing Solutions Ltd | Information & communication | 2016 |
| DDM Building Contractors Ltd | Construction | 2011 |
| DE Tany Project Management Limited | Professional & scientific | 2024 |
| De-Risk Ltd | Information & communication | 2002 |
| Deadposh Limited | Arts & recreation | 2006 |
| Deakin Consulting Limited | Professional & scientific | 2022 |
| Deakin Legal Limited | Professional & scientific | 2017 |
| DEAL2GO Ltd | Wholesale & retail | 2019 |
| Dealermate Limited | Information & communication | 2017 |
| Dean James Ltd | Wholesale & retail | 2007 |
| Death Machines of London Limited | Wholesale & retail | 2015 |
| Deborah Law Interiors Ltd | Professional & scientific | 2018 |
| Decade Distribution Limited | Wholesale & retail | 1996 |
| Decoy Angling Ltd | Wholesale & retail | 2020 |
| Deedee's Web of Light Limited | Professional & scientific | 2006 |
| Deep Star Property Rentals Limited | Real estate | 2002 |
| Deers Leap (Flats 15 to 23) RTM Company Limited | Households | 2007 |
| Deff Limited | Information & communication | 2009 |
| Deici Limited | Professional & scientific | 2010 |
| Delishious Lounge Group Ltd | Wholesale & retail | 2025 |
| Delivering Business Services (DBS) Ltd | Administrative & support | 2016 |
| Delphimedia Ltd | Construction | 2015 |
| Delphine Ltd | Wholesale & retail | 2021 |
| Delta Stainless Limited | Wholesale & retail | 2007 |
| Delta XD Limited | Professional & scientific | 2023 |
| Deltasentio Ltd | Information & communication | 2026 |
| Deltic Technology Consulting Limited | Information & communication | 2017 |
| Delves Close Management Company Limited | Households | 2015 |
| Demel Accountancy Limited | Professional & scientific | 2012 |
| Dene-Tech Services Limited | Professional & scientific | 1993 |
| Denham Invest Limited | Real estate | 2017 |
| Denmos Property Ltd | Households | 2024 |
| Dental Art Laboratory Limited | Health & social care | 2009 |
| DES Donovan Limited | Construction | 2002 |
| Desai Estates Ltd | Real estate | 2025 |
| Desbarats Consulting Ltd | Professional & scientific | 2019 |
| Design 64 Limited | Wholesale & retail | 2007 |
| Design J Limited | Professional & scientific | 2024 |
| Desl Electrical Contractors Ltd | Construction | 2007 |
| Desouza Associates Limited | Administrative & support | 2013 |
| Destecroix Limited | Real estate | 2024 |
| Detect Global Limited | Manufacturing | 2014 |