| Dacy Properties Ltd | Real estate | 2021 |
| Daddyoaker Limited | Wholesale & retail | 2015 |
| Dademire Limited | Real estate | 2014 |
| Dagge Engineering Ltd | Professional & scientific | 2021 |
| DAI Ventures Ltd | Professional & scientific | 2023 |
| Daisy Diamond Burlesque Ltd | Arts & recreation | 2025 |
| Daisy's Letterbox Limited | Wholesale & retail | 2026 |
| Daisychain Getaways Ltd | Administrative & support | 2012 |
| Daisyface Skincare Ltd | Wholesale & retail | 2022 |
| Daisymay Property Limited | Construction | 2023 |
| Dakanova Ltd | Professional & scientific | 2025 |
| Daking Designs Ltd | Professional & scientific | 2017 |
| Dakota Consulting (UK) Limited | Administrative & support | 2011 |
| Dakota Enterprises Ltd. | Hospitality | 2018 |
| Dale Close (Stanway) Management Company Limited | Households | 1991 |
| Daleplan UK Limited | Information & communication | 2005 |
| Daller Consulting Limited | Professional & scientific | 2015 |
| Dalrymple Properties Limited | Real estate | 2017 |
| Dalton Hall Design Ltd | Manufacturing | 2019 |
| Dalylane Limited | Administrative & support | 1987 |
| Dambaar Ltd | Manufacturing | 2025 |
| Dameol Services Ltd | Administrative & support | 2025 |
| Damien Demolder Ltd | Arts & recreation | 2014 |
| Damson Close (Meldreth) Management Company Limited | Households | 2023 |
| Damyas Limited | Health & social care | 2025 |
| DAN Biggins Digital Ltd | Information & communication | 2014 |
| DAN Booty Carpentry Ltd | Construction | 2008 |
| DAN Davies Limited | Financial services | 2024 |
| DAN Manley Limited | Wholesale & retail | 2014 |
| DAN Medics Limited | Health & social care | 2012 |
| DAN Mitchell Ltd | Information & communication | 2013 |
| DAN Rehab UK Limited | Health & social care | 2025 |
| Dana Camm Coaching Ltd | Other services | 2018 |
| Danann Consultancy Ltd | Professional & scientific | 2015 |
| Danawesome Ventures Ltd | Wholesale & retail | 2025 |
| Danby Scientific Limited | Professional & scientific | 2006 |
| Dancasa Ltd | Other services | 2026 |
| Dane Knighton Copywriting Ltd | Professional & scientific | 2020 |
| Danem Urban Ltd | Real estate | 2025 |
| Danes of Colchester Limited | Other services | 1985 |
| Danes Scaffolding Ltd | Construction | 2012 |
| Danhazell Ltd | Professional & scientific | 2006 |
| Dani & Josh Services Limited | Construction | 2023 |
| Dani Cleaning Services Ltd | Wholesale & retail | 2014 |
| Dani Creative Direction Ltd | Extraterritorial | 2021 |
| Dani&Josh Property Services Limited | Construction | 2020 |
| Daniel Connal Limited Liability Partnership | | 2004 |
| Daniel Holmes Building & Property Maintenance Limited | Administrative & support | 2018 |
| Daniel J. Bain (Woodturning) Limited | Manufacturing | 2003 |
| Daniel Lampey Ltd | Wholesale & retail | 2024 |
| Daniel Nielsen Limited | Construction | 2018 |
| Daniell James Limited | Other services | 2017 |
| Danny Nevill Ltd | Information & communication | 2026 |
| Danosarem Ltd | Health & social care | 2023 |
| Dantis COB Limited | Health & social care | 2024 |
| Danymaxhome Ltd | Construction | 2022 |
| Danzat James Todd Holdings Ltd | Wholesale & retail | 2023 |
| Daphidx Cleaning Services Limited | Administrative & support | 2024 |
| Darcie Properties Ltd | Real estate | 2026 |
| Dare (UK) Limited | Manufacturing | 1990 |
| Dare Ltd | Manufacturing | 2021 |
| Darem Healthcare Ltd | Health & social care | 2023 |
| Dario Goutto Limited | Information & communication | 2019 |
| Darius Oven Cleaning Ltd | Wholesale & retail | 2021 |
| Dark Bark BBQ Ltd | Hospitality | 2022 |
| Dark Knight Productions Limited | Administrative & support | 2003 |
| Darka Construction Ltd | Construction | 2026 |
| Darkbydesignbooks Ltd | Information & communication | 2022 |
| Darkhouse B2 RTM Company Limited | Households | 2021 |
| Darkspace Ltd | Information & communication | 2024 |
| Darma Solutions Limited | Health & social care | 2026 |
| Daro Glaze Ltd | Construction | 2017 |
| Darren Hogg Limited | Construction | 2009 |
| Darren Tucker Insulation Ltd | Construction | 2003 |
| Darrose Limited | Other services | 1986 |
| Darsah Interiors Ltd | Professional & scientific | 2022 |
| Darsah Ltd | Other services | 2016 |
| Darsham Larkfield Meadows Management Company Limited | Real estate | 2015 |
| Darst Ltd | Construction | 2024 |
| Darwood IP Limited | Health & social care | 2020 |
| DAS Tax Limited | Professional & scientific | 2008 |
| Das@Global Limited | Administrative & support | 2023 |
| Dasarathy Ltd | Health & social care | 2026 |
| Dash Developments (East Anglia) Limited | Construction | 2021 |
| Dashians Ltd | Wholesale & retail | 2021 |
| Dasieuk Ltd | Administrative & support | 2019 |
| Dasler Ltd | Professional & scientific | 2018 |
| Data Active Limited | Information & communication | 2013 |
| Data Center Construction Services Ltd | Construction | 2010 |
| Data Professionals Ltd | Information & communication | 2019 |
| Data Transparency Limited | Information & communication | 2006 |
| Datacrop Limited | Information & communication | 2013 |
| Datafuel Limited | Information & communication | 2017 |
| Datapark Limited | Information & communication | 2006 |
| Dataphyte UK Ltd | Information & communication | 2021 |
| Datasafe Software Solutions Limited | Administrative & support | 2011 |
| Datasort Limited | Professional & scientific | 2012 |
| Datasyms, Inc. Limited | Professional & scientific | 2009 |
| Datatek (Electrical) Ltd | Administrative & support | 2011 |
| Datatrak FM Ltd | Professional & scientific | 2018 |