| Derwent Close Management Limited | Households | 1996 |
| Desara Limited | Real estate | 2025 |
| Descian Limited | Information & communication | 2019 |
| Desi Bros Tiles and Plumbing Ltd | Construction | 2021 |
| Design PER Week Ltd | Professional & scientific | 2026 |
| Designs Base Limited | Construction | 2011 |
| Desiinfusion Ltd | Hospitality | 2022 |
| Desiretech Ltd | Wholesale & retail | 2015 |
| Desor Homes Limited | Real estate | 2015 |
| Detailing Perfection Limited | Professional & scientific | 2016 |
| Deva Property Investments Limited | Real estate | 2020 |
| Devereux & SON Limited | Professional & scientific | 2025 |
| Devesh Ltd | Households | 2022 |
| Devi Pictures Limited | Information & communication | 2025 |
| Devils One Limited | Information & communication | 2013 |
| Devlin Haulage Ltd | Transport & logistics | 2011 |
| Devya Enterprises Limited | Real estate | 2020 |
| DEW Estate PVT Ltd | Real estate | 2020 |
| DEW Property Management Ltd | Real estate | 2024 |
| Dexfx Ltd | Professional & scientific | 2018 |
| Dexis Dental Technology Limited | Manufacturing | 2021 |
| Dexterous Traders Limited | Wholesale & retail | 2020 |
| DF Cars Ltd | Administrative & support | 2019 |
| DFX Maintenance Services Ltd | Administrative & support | 2024 |
| DGA Carpentry Limited | Construction | 2019 |
| DGN13 Ltd | Real estate | 2026 |
| DH Mechanical Pipework Ltd | Construction | 2023 |
| Dhad Productions Limited | Information & communication | 2021 |
| Dhali Property Services Limited | Real estate | 1995 |
| Dhaliwal Builders and Bricklayers Limited | Construction | 2020 |
| Dhaliwal Real Estate Ltd | Real estate | 2020 |
| Dhamaka Restaurant London UK Ltd | Hospitality | 2025 |
| Dhandiwalia Brothers Ltd | Transport & logistics | 2024 |
| Dhanoa Development Limited | Real estate | 2024 |
| Dhansh Estates UK Ltd | Real estate | 2021 |
| Dhansh UK Limited | Transport & logistics | 2009 |
| Dharshan Associates Limited | Real estate | 2025 |
| Dhesi & Dhesi Investments Ltd | Real estate | 2021 |
| Dhill Ltd | Real estate | 2022 |
| Dhillinger Group Ltd | Other services | 2021 |
| Dhillinger Properties Ltd | Real estate | 2024 |
| Dhillon & Dylan Limited | Real estate | 2025 |
| Dhillon Legacy Limited | Real estate | 2025 |
| Dhindsa Builders Limited | Construction | 2025 |
| Dhingra Enterprises Ltd | Transport & logistics | 2026 |
| Dhirendra Kumar Limited | Health & social care | 2014 |
| Dhobi Weatherproofs Limited | Extraterritorial | 1934 |
| Diablo Logistics Ltd | Transport & logistics | 2025 |
| Diaconu Delivery Services and Bookings Ltd | Transport & logistics | 2019 |
| Diamond Kickboxing Ltd | Arts & recreation | 2026 |
| Diamond Nails 17 Ltd | Other services | 2022 |
| Diamond Phones Ltd | Information & communication | 2014 |
| Diamond Premium Chauffeurs Ltd | Transport & logistics | 2018 |
| Diamond Ridge Constructions Ltd | Construction | 2021 |
| Diamond Setting Studio Ltd | Professional & scientific | 2017 |
| Diamondviva Ltd | Hospitality | 2023 |
| Diana Webb & Daughters Limited | Real estate | 2020 |
| Dice Films Limited | Information & communication | 2023 |
| Digdag Media Limited | Information & communication | 2017 |
| Digikart Ltd | Information & communication | 2012 |
| Digilytics Limited | Information & communication | 2025 |
| Digipetpad Ltd | Wholesale & retail | 2026 |
| Digital Building Design and Beyond Limited | Professional & scientific | 2024 |
| Digital Growth Factor Private Limited | Wholesale & retail | 2021 |
| Dignity in Care Services Limited | Health & social care | 2018 |
| Diligence 2.0 Ltd | Other services | 2025 |
| Diligent Property Developers Limited | Construction | 2024 |
| Dill Homes Limited | Construction | 2025 |
| Dilly Tally Ltd | Education | 2025 |
| Dina Foods Limited | Manufacturing | 1991 |
| Dina Ventures Group Limited | Financial services | 2024 |
| Dine UK PVT Ltd | Hospitality | 2016 |
| Dinvin Investment Ltd | Real estate | 2023 |
| Dinvin Traders Limited | Wholesale & retail | 2020 |
| Dira Foundation | Administrative & support | 2011 |
| Direct Painters Ltd | Construction | 2019 |
| Direct Staff (UK) Limited | Administrative & support | 2014 |
| Directpath Couriers Ltd | Transport & logistics | 2024 |
| Dirty Dog Services Ltd | Information & communication | 2014 |
| Discount Food and Wine Limited | Wholesale & retail | 2010 |
| Discover Twickenham BID Limited | Administrative & support | 2018 |
| Discovery Waste Solutions Ltd | Water & waste | 2025 |
| Disk Limited | Real estate | 2016 |
| Disrupt World Ltd. | Education | 2021 |
| Disrupther CIC | Information & communication | 2025 |
| Ditton Property Management LLP | | 2010 |
| Divan & Sons Ltd | Real estate | 2023 |
| Diversity Services Ltd | Administrative & support | 2022 |
| Divyaniwas Ltd | Real estate | 2024 |
| Dixie Pizza Ltd | Wholesale & retail | 2025 |
| Dixonvision Ltd | Information & communication | 2026 |
| DIY Depot Ltd | Wholesale & retail | 2026 |
| Djemil Properties Limited | Real estate | 2022 |
| DJH Financial Ltd | Financial services | 2024 |
| DJL Investments Limited | Real estate | 2025 |
| DJM Tech Services Ltd | Construction | 2023 |
| DK BID Consultancy Limited | Information & communication | 2010 |
| DK Nankani Healthcare Ltd | Health & social care | 2026 |
| DK Nankani Ltd | Health & social care | 2016 |
| Dk.Contractors & Services Ltd | Construction | 2013 |