| Admiral Solutions Limited | Harrogate | 2025 |
| Admobility Limited | Thatcham | 2013 |
| Admu Consulting Ltd | Oswestry | 2025 |
| Adnan Trade International Co., Ltd | London | 2024 |
| Adobe Partners Ltd | London | 2021 |
| Adom Ventures Limited | Basildon | 2026 |
| Adonael Ltd | London | 2020 |
| Adonai Todj'Rhon Baruch Joseph Lee-Francis Ltd | Coventry | 2022 |
| Adonis Barbers Ltd | Ulverston | 2013 |
| Adora Industry and Trade Ltd | Cardiff | 2016 |
| Adoram Ltd | Walsall | 2024 |
| Adornment Ltd | London | 2010 |
| Adovnad Ltd | Bracknell | 2022 |
| ADP & Co Ltd | Solihull | 2012 |
| ADP Ltd | Birmingham | 2021 |
| ADR Healthcare Consultancy Solutions Ltd | Sturmer | 2017 |
| ADR Safety Limited | London | 2011 |
| Adrana Limited | Newcastle Upon Tyne | 2007 |
| Adrasteia Ltd | London | 2013 |
| Adrenalin Studio Ltd | London | 2025 |
| Adrenaline Combatives Ltd | Stockport | 2025 |
| Adrenaline London Ltd | London | 2012 |
| Adrh Mortgage Services Ltd | Wilford | 2013 |
| Adria Fiske Limited | Cardiff | 2025 |
| Adrian COX Ltd | Abingdon | 2015 |
| Adrian Madden Ltd | Sheffield | 2025 |
| Adrian Mark Jackson Ltd | Cannock | 2023 |
| Adrian Tungi Thomas Akintola Grant Ltd | Stratford | 2025 |
| Adrian Waters Architecture Ltd | Holywell | 2011 |
| Adriatic Land 13 (GR2) Limited | London | 2016 |
| Adriatic Land 4 (GR1) Limited | London | 2009 |
| Adriatic Land ASP 1 Limited | London | 2022 |
| Adriatic Land ASP 2 Limited | London | 2022 |
| Adriatic Solutions Limited | Salford | 2021 |
| Adrien Wittmann Ltd | London | 2023 |
| Adrisant Ltd | London | 2015 |
| Adroit Commercial Limited | Halesowen | 2024 |
| ADS Consult Limited | Southend On Sea | 2023 |
| Adsila Holding Ltd | London | 2021 |
| Adsm Trustees Limited | Windsor | 2009 |
| Adsum Auxilium Limited | Tunbridge Wells | 1999 |
| Adtec Screen & Digital Supplies Ltd | Stoke-On-Trent | 2016 |
| Adtrack Limited | London | 1981 |
| Adtrex Ltd | Canterbury | 2010 |
| Adult & Childrens Ballet Ltd | Spalding | 2019 |
| Adult Holidays Limited | Royston | 2017 |
| Adultsworld Limited | Ashton-Under-Lyne | 2012 |
| Adurproperty Ltd | Shoreham-By-Sea | 2013 |
| Adusz Ltd | Bedworth | 2018 |
| ADV Marketing Limited | London | 2020 |
| Advagreen Ltd | Stockbridge | 2022 |
| Advance Alpha UK Ltd | London | 2021 |
| Advance Computers Limited | Burgess Hill | 2005 |
| Advance Cooler Technology Limited | Bromsgrove | 2020 |
| Advance Foam Products Limited | Ilford | 1985 |
| Advance Foster Care Limited | Bolton | 2002 |
| Advance Fuels Limited | Warrington | 1991 |
| Advance Maintenance Services Ltd | Edgware | 2007 |
| Advance Management Group Ltd | London | 2020 |
| Advance Motors (Leeds) Ltd | Knaresborough | 1979 |
| Advance Padel Ltd | Edinburgh | 2021 |
| Advance Property Developments | Sheffield | 1996 |
| Advance Property Management (CI) Ltd | London | 2020 |
| Advance Roofing Supplies Limited | London | 1994 |
| Advance Scout Limited | Bath | 2023 |
| Advance Service Technology Co. Ltd | Sunderland | 2020 |
| Advance Sunny Spain Limited | Hitchin | 2004 |
| Advance Systems Limited | Bridgend | 2023 |
| Advancechief Limited | Berkshire | 1992 |
| Advanced Accountancy Services Ltd | Kingswinford | 2012 |
| Advanced Andrology Ltd | London | 2020 |
| Advanced Apertures Ltd | London | 2024 |
| Advanced Bonding Solutions Ltd | Burton-On-Trent | 1988 |
| Advanced Breakdown Services UK Ltd | Leighton Buzzard | 2024 |
| Advanced Business Enterprises Ltd | Co Down | 2009 |
| Advanced Chimney Solutions Ltd | Ballyclare | 2003 |
| Advanced Cladding & Insulation Group Limited | Sheffield | 1981 |
| Advanced Composite Manufacturing Limited | Boston | 2008 |
| Advanced Contracting Solutions Limited | Newport | 2013 |
| Advanced Dental Training Limited | Oxford | 2009 |
| Advanced Digital Solutions Limited | London | 2024 |
| Advanced Doors Limited | Huddersfield | 1997 |
| Advanced Electrical Solar Solutions Limited | Newport | 2011 |
| Advanced Emission Solutions Limited | Runcorn | 2006 |
| Advanced Engineering Systems Ltd | London | 2015 |
| Advanced Environmental Solutions Ltd | Bury | 2020 |
| Advanced Fire and Rescue Solutions Limited | Harrogate | 2026 |
| Advanced Heat Transfer Limited | Washington | 2020 |
| Advanced Imaging (Nottingham) Limited | Nottingham | 1996 |
| Advanced Innergy EBT Ltd | Gloucester | 2017 |
| Advanced Links Limited | London | 2008 |
| Advanced Mathematical Software Limited | Farnham | 1978 |
| Advanced Medical Solutions (Plymouth) Limited | Winsford | 1998 |
| Advanced Mining Industry Limited | Beckenham | 2012 |
| Advanced Reconstructive Solutions Limited | Bolton | 2016 |
| Advanced Resins Limited | Wigan | 2006 |
| Advanced Retirement Living Limited | Windsor | 2014 |
| Advanced Roll Solutions Limited | Runcorn | 2007 |
| Advanced Soft Solutions Ltd | Coventry | 2022 |
| Advanced Solar Design Limited | Truro | 2025 |