| DJT Property Holdings Ltd | Real estate | 2025 |
| DK Care 24/7 Ltd | Administrative & support | 2020 |
| DK Plumbing & GAS Services Ltd | Construction | 2026 |
| DK Properties Group Ltd | Real estate | 2025 |
| DK Transport Ltd | Construction | 2019 |
| DKA Air Cooling Ltd | Manufacturing | 2018 |
| Dkad Enterprise Ltd | Wholesale & retail | 2025 |
| DKS of Detailing Limited | Wholesale & retail | 2024 |
| Dleo Ltd | Construction | 2016 |
| Dlugos Nikole Ltd | Construction | 2023 |
| DM Art Gallery Ltd | Wholesale & retail | 2019 |
| DM Brothers Ltd | Transport & logistics | 2020 |
| DMA IT Limited | Information & communication | 2007 |
| Dmbg Building Ltd | Construction | 2024 |
| DMC Express Logistics Ltd | Transport & logistics | 2026 |
| DMC Matching Limited | Professional & scientific | 2023 |
| Dmjj Services UK Ltd | Professional & scientific | 2016 |
| DMO Associates Limited | Professional & scientific | 2024 |
| DMT Property Holdings Ltd | Real estate | 2024 |
| DNA Elite Soccer Academy Limited | Arts & recreation | 2020 |
| Dnda Construct Ltd | Construction | 2024 |
| Doac Limited | Financial services | 2026 |
| Dobson Logistical Services Ltd | Transport & logistics | 2025 |
| DOC Ucee Ltd | Health & social care | 2026 |
| Doctors Billing Services Ltd. | Administrative & support | 2014 |
| Doctors Secretarial Services Ltd. | Administrative & support | 2017 |
| Doda Marbles Limited | Construction | 2019 |
| Doda Utilities Ltd | Construction | 2026 |
| Dodd Properties Limited | Real estate | 2012 |
| DOE Property Management Limited | Households | 2016 |
| Dokita Healthcare Limited | Health & social care | 2023 |
| Dolly GAL Limited | Wholesale & retail | 2024 |
| Domareon Properties Limited | Real estate | 2025 |
| Domestic Cleaners Group Ltd | Administrative & support | 2019 |
| Domestic Investments Ltd | Real estate | 2023 |
| Dominic Mohan Media Limited | Administrative & support | 2018 |
| Dominion Faith Chapel CIC | Other services | 2022 |
| Domum Services Limited | Real estate | 2022 |
| Donchezo Healthcare Ltd | Health & social care | 2023 |
| Doner Weigh Limited | Other services | 2024 |
| Donna K Ltd | Health & social care | 2022 |
| Donna Watts Aesthetics Ltd. | Health & social care | 2019 |
| Donotalight Ltd | Arts & recreation | 2022 |
| Dontiss Medical Solutions Limited | Health & social care | 2026 |
| Donventures Ltd | Wholesale & retail | 2022 |
| Doohvert Ltd | Professional & scientific | 2025 |
| Door 2 Door Parcel Service Limited | Transport & logistics | 2023 |
| Dorarevive Wellness Solution Ltd | Health & social care | 2025 |
| Doree Wealth Management Limited | Financial services | 2013 |
| Dori Flowers Ltd | Wholesale & retail | 2025 |
| Dorrington Performance Ltd | Wholesale & retail | 2022 |
| Dory Global Ltd | Health & social care | 2020 |
| Doryka Ltd | Transport & logistics | 2022 |
| DOS Shop Ltd | Wholesale & retail | 2021 |
| Dosanjh Enterprises Ltd | Construction | 2024 |
| DOT to DOT Printing Ltd | Arts & recreation | 2014 |
| Dotc Ltd | Professional & scientific | 2020 |
| Dotunade Ltd | Professional & scientific | 2025 |
| Double Dollars Ltd | Wholesale & retail | 2026 |
| Double Infinity Services Ltd | Administrative & support | 2019 |
| Double Triangle Limited | Arts & recreation | 2025 |
| Doublelight Technology Limited | Information & communication | 2011 |
| Douglas and Co Management Ltd | Professional & scientific | 2018 |
| Douglas Homes Group Ltd | Real estate | 2021 |
| Douglas Jones Phillips Ltd | Professional & scientific | 2010 |
| Dovecote Building RTM Company Limited | Households | 2010 |
| Dovia Plus Ltd | Administrative & support | 2015 |
| Downes House Residents Association Limited | Households | 1964 |
| Dows Capital Partners Limited | Financial services | 2015 |
| Dows Property Services Ltd | Construction | 2026 |
| Dozen Service Pro Limited | Construction | 2025 |
| DP Accounts Limited | Professional & scientific | 2015 |
| DP Painting & Decorating Ltd | Construction | 2020 |
| Dpjtal Investments Ltd | Real estate | 2025 |
| DPR Electrics Ltd | Construction | 2009 |
| DR Abdelwahab Medical Services Ltd | Health & social care | 2026 |
| DR Applewaite Dermatology Ltd | Health & social care | 2025 |
| DR Crystal Healthcare & Wellness Ltd | Health & social care | 2026 |
| DR Elghazouli Medical Service Ltd | Health & social care | 2026 |
| DR Eric Nwosu Ltd | Health & social care | 2026 |
| DR Omar Ltd | Health & social care | 2024 |
| DR OS Faniyi Limited | Health & social care | 2023 |
| DR Salman Psychology Ltd | Health & social care | 2023 |
| DR. Swagz Health & Fitness Ltd | Health & social care | 2024 |
| Dragusin Transporter Ltd | Transport & logistics | 2016 |
| Drais Energy Limited | Wholesale & retail | 2021 |
| Drak Medical Ltd | Health & social care | 2022 |
| Draymans Court (Chingford) Management Company Limited | Administrative & support | 2018 |
| DRB 5 Ltd | Real estate | 2021 |
| DRD International Ltd | Professional & scientific | 2020 |
| Drdel Ltd | Health & social care | 2026 |
| Drea Housing Limited | Real estate | 2023 |
| Dreadnought Engineering Solutions Ltd | Professional & scientific | 2018 |
| Dreadnought Shipping Ltd | Transport & logistics | 2002 |
| Dream Home Consultancy Ltd | Real estate | 2025 |
| Dream Special Care Limited | Health & social care | 2024 |
| Dream Team Properties Limited | Real estate | 2021 |
| Dreams and Castles Limited | Real estate | 2023 |
| Dreams Haulage Limited | Water & waste | 2018 |
| Dreams Shop Limited | Wholesale & retail | 2020 |