| A Contracts Ltd | Construction | 2018 |
| A Couper Marketing Services Ltd | Administrative & support | 2006 |
| A Couple of Birds Design Ltd | Professional & scientific | 2023 |
| A Craftsman's Workshop Ltd | Construction | 2007 |
| A Craver's Box Ltd | Hospitality | 2025 |
| A Creative Agency Limited | Information & communication | 2015 |
| A Creative COG Ltd | Manufacturing | 2018 |
| A Creative Endeavour Ltd | Professional & scientific | 2023 |
| A Cube Utilities Ltd | Administrative & support | 2017 |
| A Cubed Associates Ltd | Professional & scientific | 2023 |
| A Cubed Property Ltd | Real estate | 2021 |
| A Culture of Sports C.I.C. | Arts & recreation | 2024 |
| A Curious Business Ltd | Professional & scientific | 2017 |
| A Curious Group of Hotels (UK) Limited | Professional & scientific | 2005 |
| A Curious Invitation Limited | Arts & recreation | 2025 |
| A Curious Soul Limited | Administrative & support | 2023 |
| A Curious Tale Limited | Information & communication | 2026 |
| A Curnow & SON Construction Ltd | Construction | 2023 |
| A CUT Above Merch and Uniform Limited | Manufacturing | 2025 |
| A CUT Above the Best Limited | Other services | 2015 |
| A D a Performance Analytics Limited | Information & communication | 2013 |
| A D Accessories Limited | Wholesale & retail | 2018 |
| A D Blackburn Ltd | Professional & scientific | 2020 |
| A D Building & Maintenance Services Ltd | Construction | 2020 |
| A D Building & Renovations Limited | Construction | 2025 |
| A D Construction UK Ltd | Construction | 2003 |
| A D Consultants (UK) Ltd | Real estate | 2009 |
| A D Corum | | 1997 |
| A D Delariquco Ltd | Financial services | 2026 |
| A D Environmental Limited | Construction | 2010 |
| A D Foods Ltd | Wholesale & retail | 2001 |
| A D Homes London Ltd | Construction | 2015 |
| A D I Solutions (Ltd.) | Construction | 1998 |
| A D Imperative Ltd | Other services | 2020 |
| A D L Advanced Contractors Ltd | Construction | 2012 |
| A D Lead Roofing Ltd | Construction | 2007 |
| A D Lim-Lo Limited | Manufacturing | 2011 |
| A D M Lim-Lo Limited | Extraterritorial | 2022 |
| A D Optical Services Ltd | Wholesale & retail | 2019 |
| A D Patel & Co Ltd | Professional & scientific | 2005 |
| A D Removals Ltd | Water & waste | 2007 |
| A D Residential Investments Ltd | Real estate | 2014 |
| A D S Builders AL Ltd | Construction | 2022 |
| A D Smith Construction Limited | Construction | 2025 |
| A D Wardle Ltd | Professional & scientific | 2015 |
| A D&G Holdings Ltd | Hospitality | 2020 |
| A D&G Recruitment Ltd | Administrative & support | 2020 |
| A Damen Consulting Ltd | Information & communication | 2025 |
| A Dandy Wren Limited | Households | 2020 |
| A Danials Limited | Professional & scientific | 2026 |
| A Dapper Company Ltd | Professional & scientific | 2018 |
| A Darker Light Limited | Information & communication | 2015 |
| A Darville Plumbing and Heating Ltd | Construction | 2014 |
| A Dash of Design Limited | Professional & scientific | 2021 |
| A Data Curious Limited | Information & communication | 2019 |
| A Day Para MI Ltd | Wholesale & retail | 2026 |
| A DE B Limited | Real estate | 1989 |
| A DE Beer Contracts Limited | Health & social care | 2012 |
| A DE Berniere Group Holdings Limited | Professional & scientific | 2025 |
| A DE Berniere Limited | Professional & scientific | 2025 |
| A Deacon Ltd | Other services | 2023 |
| A Dean Financial Solution Ltd | Administrative & support | 2016 |
| A Dearlove Production Limited | Manufacturing | 2022 |
| A Decor Story Ltd | Professional & scientific | 2025 |
| A Dedicated Studio Ltd | Professional & scientific | 2026 |
| A Design Collective Limited | Professional & scientific | 2026 |
| A Design Group Ltd | Construction | 2024 |
| A Designer at Heart Ltd | Professional & scientific | 2018 |
| A Dhar AG Ltd | Information & communication | 2022 |
| A Different Cloth Ltd | Manufacturing | 2022 |
| A Different Corner Ltd | Professional & scientific | 2017 |
| A Different Way Ltd | Professional & scientific | 2025 |
| A Disgraceful Mobile Cocktail Bar Ltd | Hospitality | 2025 |
| A Disguisery Limited | Professional & scientific | 2014 |
| A Diverse Agency Ltd | Information & communication | 2021 |
| A Dog Person Ltd | Manufacturing | 2024 |
| A Dog's Life Pet Store Ltd | Wholesale & retail | 2025 |
| A Dogs BIZ Recreation and Wellbeing Centre Ltd | Other services | 2020 |
| A Donald Fitness Ltd | Education | 2023 |
| A Donut LAB Limited | Hospitality | 2021 |
| A Door Left Ajar Ltd | Information & communication | 2026 |
| A Dope Point of View Limited | Information & communication | 2020 |
| A DOT Limited | Administrative & support | 2011 |
| A Double Ltd | Transport & logistics | 2025 |
| A Dozen Communications Limited | Professional & scientific | 2003 |
| A Drop Foundation | Education | 2023 |
| A Drop of Clarity Ltd | Information & communication | 2023 |
| A DUA Private Limited | Other services | 2026 |
| A Dubey Ltd | Financial services | 2024 |
| A Duffield Consultancy Ltd | Other services | 2014 |
| A E B D Investments Ltd | Real estate | 2026 |
| A E Chilled Limited | Transport & logistics | 2020 |
| A E Family Holdings Trustees LP | | 2024 |
| A E K Property Investment Limited | Real estate | 2016 |
| A E Medicolegal Limited | Professional & scientific | 2003 |
| A E P L Limited | Wholesale & retail | 1990 |
| A E Properties Management Ltd | Real estate | 2025 |
| A E R (Holdings) Limited | Financial services | 2013 |
| A E Railway Solutions Ltd | Construction | 2014 |
| A E Realty Ltd | Real estate | 2026 |