| Cutting Edge Surgery Limited | Health & social care | 2011 |
| Cuttlefish Games Ltd | Information & communication | 2025 |
| CW Consultancy Limited | Professional & scientific | 2023 |
| CW Dent Limited | Health & social care | 2025 |
| CWC Coffee Roasters Ltd | Other services | 2018 |
| Cwcc Properties Limited | Construction | 2020 |
| CXC Consultants Limited | Information & communication | 2007 |
| Cyber-Assure Technology Limited | Information & communication | 2022 |
| Cygnus Cloud Consulting Ltd | Professional & scientific | 2022 |
| Cynola Limited | Professional & scientific | 2021 |
| Cypress Place Ltd | Households | 2020 |
| Cyrlls Ltd | Hospitality | 2025 |
| Cyrus Trading Group Ltd | Wholesale & retail | 2026 |
| CZH Ltd | Administrative & support | 2025 |
| D & D Facilities Southern Ltd | Administrative & support | 2020 |
| D & L Property Investments Limited | Real estate | 2012 |
| D B Build (Sussex) Ltd | Construction | 2025 |
| D Cassidy Limited | Construction | 2014 |
| D Fisher Contracting Limited | Professional & scientific | 2025 |
| D G Woodworking Ltd | Manufacturing | 2017 |
| D Hoffbrand Ltd | Education | 2006 |
| D J Plumbing & Heating (Brighton) Ltd | Construction | 2016 |
| D K Music Management Limited | Arts & recreation | 2010 |
| D Sharp Sales Limited | Administrative & support | 2007 |
| D&C Palmer Ltd | Financial services | 2025 |
| D&T Tree Surgery Ltd | Agriculture & fishing | 2019 |
| D-Com Limited | Information & communication | 2006 |
| D. Farlen Limited | Health & social care | 2025 |
| D. Floate Plumbing & Heating Limited | Construction | 2006 |
| D.A.K.K. Property Limited | Households | 2021 |
| D.J. Cook (Builders) Limited | Construction | 1962 |
| D.P.J Fruits Ltd | Wholesale & retail | 2012 |
| D.R.V Solutions Limited | Professional & scientific | 2018 |
| D.S.A. Investments Ltd. | Hospitality | 2001 |
| D68 Software Limited | Information & communication | 2018 |
| DA Design and Development Ltd. | Professional & scientific | 2026 |
| DA Silva Bar & Grill Limited | Hospitality | 2026 |
| Dakota MEP Ltd | Administrative & support | 2022 |
| Dalesglade Limited | Households | 1981 |
| Daley Perry Developments Limited | Real estate | 2025 |
| Dali Consultancy Ltd | Professional & scientific | 2019 |
| Dalton Barnes Capital Limited | Construction | 2026 |
| Dalton Barnes Consulting Limited | Professional & scientific | 2020 |
| Daltons Dream Limited | Information & communication | 2021 |
| Dalya Ventures Ltd | Real estate | 2019 |
| Damask for the Home Ltd | Wholesale & retail | 2003 |
| Damsam Productions Limited | Extraterritorial | 2015 |
| DAN Crowley Surveying Ltd | Professional & scientific | 2022 |
| DAN DAW Creative Projects Ltd | Arts & recreation | 2022 |
| DAN Read Electrical Services Ltd | Construction | 2025 |
| Dance Universe Limited | Arts & recreation | 2016 |
| Dance World CUP UK Limited | Arts & recreation | 2015 |
| Daniel Abatan Ltd | Information & communication | 2020 |
| Daniel Jones Carpentry Limited | Manufacturing | 2025 |
| Daniel Kennedy Limited | Professional & scientific | 2006 |
| Daniela's Lounge Ltd | Hospitality | 2013 |
| Daniyal Holdings Limited | Professional & scientific | 2017 |
| Daphne Dental Limited | Health & social care | 2025 |
| Daphnis Limited | Health & social care | 2026 |
| Daratic Global Foods Limited | Wholesale & retail | 2018 |
| Darchini Limited | Hospitality | 2018 |
| Dare-Gale Press | Information & communication | 2016 |
| Dark Sea Wine Ltd | Wholesale & retail | 2018 |
| Darkstream Media Limited | Information & communication | 2009 |
| Darren Dorrington Developments Limited | Real estate | 2021 |
| Dartford Road Dental Limited | Health & social care | 2016 |
| Dartroom Ltd | Information & communication | 2022 |
| Daryel Care Greenwich Limited | Health & social care | 2023 |
| Dashdigital Collective Ltd | Information & communication | 2025 |
| Dashie Developments Ltd | Construction | 2026 |
| Datahero Limited | Professional & scientific | 2022 |
| Datawing Limited | Information & communication | 2011 |
| DAV Hewit Solutions Limited | Professional & scientific | 2013 |
| Dave Moss Property Maintenance Ltd | Construction | 2007 |
| Daveys Catering Ltd | Hospitality | 2016 |
| David Chetwin Limited | Professional & scientific | 2015 |
| David Howells Builders Ltd | Construction | 2020 |
| David Ishola Limited | Other services | 2012 |
| David Store Limited | Wholesale & retail | 2025 |
| Davidson Carpentry Limited | Manufacturing | 2020 |
| Davies Period Plaster Mouldings Limited | Construction | 2009 |
| Davigdor Mansions Limited | Hospitality | 2005 |
| Daviniadent Limited | Health & social care | 2018 |
| Davis Aniston Stallard Ltd | Administrative & support | 2023 |
| Davista Ltd | Arts & recreation | 2026 |
| Davy Evans Limited | Professional & scientific | 2020 |
| Dawn Market Ltd | Wholesale & retail | 2024 |
| Dawn Supplements Ltd | Wholesale & retail | 2025 |
| Dawson and Coote Properties Limited | Real estate | 2024 |
| Day Aviation Limited | Transport & logistics | 2006 |
| Daya Capital Ltd | Real estate | 2026 |
| Dazzling Design Concept Studio Ltd | Professional & scientific | 2022 |
| DB Analytics Ltd | Information & communication | 2016 |
| Dballardproperty Limited | Households | 2025 |
| DBY Property Limited | Real estate | 2023 |
| DCS Structural Design Ltd | Professional & scientific | 2022 |
| DD Installation Limited | Construction | 2009 |
| DE Minimis LEX Limited | Professional & scientific | 2005 |
| DE Paris Advisory Limited | Professional & scientific | 2020 |
| DE Silver Designs Limited | Manufacturing | 1999 |