| Addumine Ltd | Kidderminster | 2019 |
| Addvance Limited | London | 2025 |
| Addventure Leisure Limited | Southampton | 2021 |
| Addventure Tours Limited | Watford | 2018 |
| Addwarmth Plumbing and Heating Specialist Limited | Deanshanger | 2008 |
| Addwell Business Equipment Limited | | 1989 |
| Addwell Epos Solutions Ltd | Romford | 2016 |
| Addy and Family Ltd | Walsall | 2019 |
| Addy Futures Limited | Great Yarmouth | 2022 |
| Addy Solutions Limited | Croydon | 2018 |
| Addysg Seren Education Ltd | Kidwelly | 2016 |
| ADE Consultancy Ltd | Woodford Green | 2025 |
| ADE Consulting Global Limited | London | 2020 |
| ADE Crown Ventures Ltd | Smethwick | 2018 |
| ADE Developments Limited | Poole | 2016 |
| ADE Power Limited | Pontefract | 1997 |
| ADE Protection Ltd | Colchester | 2019 |
| ADE Recruitment Limited | Sale | 1999 |
| ADE T.O.T Healthcare Limited | Sheerness | 2013 |
| ADE TC Cleaning Ltd | Gillingham | 2019 |
| Ade-Divine Consulting Ltd | Andover | 2012 |
| Ade-Oye UK Enterprises Ltd | Sale | 2014 |
| ADE4CARE Limited | Cardiff | 2023 |
| Adea Care Solutions Limited | Grimsby | 2022 |
| Adeadin Ltd | Boston | 2020 |
| Adealon Limited | Slough | 2007 |
| Adebest Global IT Solutions Limited | Gravesend | 2019 |
| Adebims Limited | Manchester | 2019 |
| Adebolmos Limited | Nottingham | 2025 |
| Adecco UK Limited | London | 1957 |
| Adecs Training Limited | Coventry | 2000 |
| Adecyn Limited | Wolverhampton | 2018 |
| Adedam Waste & Cleaning Services Ltd | Manchester | 2025 |
| Adedio Company Limited | Welling | 2013 |
| Adedmundson AVS Ltd | Bacup | 2024 |
| Adeeagle Limited | Manchester | 2023 |
| Adeel Basharat Ltd | Nottingham | 2019 |
| Adeel Security Ltd | Nottingham | 2025 |
| Adeela Salehjee Limited | London | 2016 |
| Adeenakenny Ventures Ltd | Manchester | 2024 |
| Adeer International UK Limited | London | 2026 |
| Adefem Concepts Solutions Ltd | Birmingham | 2025 |
| Adefey Group Ltd | Doncaster | 2020 |
| Adegraf UK Ltd | Manchester | 2017 |
| Adekins Ltd | Birmingham | 2022 |
| Adekkd Care Services Ltd | Carterton | 2019 |
| Adel Lane Ltd | London | 2025 |
| Adel Legal Ltd | Leeds | 2018 |
| Adel Links Consulting Ltd | London | 2025 |
| Adel Wood Landscaping Ltd | Leeds | 2024 |
| Adela Cleaning Corby Ltd | Corby | 2026 |
| Adela Pantiru Ltd | Luton | 2026 |
| Adelaide Hub Ltd | Romford | 2020 |
| Adelaide Jones & Co Limited | | 2000 |
| Adelaide Jones International Limited | London | 2016 |
| Adelaide OLU Groups Ltd | Gravesend | 2020 |
| Adelaidey Limited | Erith | 2021 |
| Adelanta Travel Services Limited | Nottingham | 1989 |
| Adelante Asset Holdings Limited | Colchester | 2009 |
| Adelar Facilities Management Ltd | Oldbury | 2023 |
| Adelass Ltd | London | 2019 |
| Adelat UK Limited | Dagenham | 2013 |
| Adelbert Ltd | Haverfordwest | 2020 |
| Adele Carr Recruitment Limited | Warrington | 2006 |
| Adele Cleaning Agency Ltd | Glasgow | 2017 |
| Adele's Cleaning Service Limited | London | 2025 |
| Adeleh Limited | Chessington | 2016 |
| Adeliluxe Cleaning Ltd | London | 2016 |
| Adelina 92 Ltd | Surbiton | 2019 |
| Adelina Dreams Limited | Harrow | 2022 |
| Adelinacamasoiu Limited | Middlesbrough | 2025 |
| Adeline Help Services Limited | London | 2023 |
| Adeline Holdings Limited | London | 2014 |
| Adelivia Cleaning Services Ltd | Manchester | 2025 |
| Adelphi Cleaning Company Ltd | Harlow | 2013 |
| Adelphi Commercial Cleaning Ltd | London | 2022 |
| Adelphi Communications Limited | London | 1992 |
| Adelphi Court Freehold Limited | London | 2015 |
| Adelphi Funding Limited | Hitchin | 2000 |
| Adelphi Group Limited | London | 1986 |
| Adelphi Plant Hire (Scotland) Ltd | Lugar | 2002 |
| Adelphi Recruitment Europe Ltd | Rotherham | 2022 |
| Adelphi SD Limited | Greater Manchester | 2002 |
| Adelphi Services Limited | Warrington | 2009 |
| Adelphi Translations Limited | Barnsley | 2009 |
| Adelphi Values Limited | London | 1992 |
| Adelphi Wharf Phase 1 Ltd | Altrincham | 2017 |
| Adelta Plumbing & Heating Ltd | Waterlooville | 2017 |
| Adelta Staffing Ltd | London | 2022 |
| Adem Hand Car Wash Limited | Sturminster Newton | 2026 |
| Adem Traders Ltd | Hemel Hempstead | 2020 |
| Ademayowa Global Limited | Stevenage | 2024 |
| Ademco 1 Limited | London | 2018 |
| Ademi Security Ltd | London | 2024 |
| Ademighty Housing C.I.C. | Wolverhampton | 2019 |
| Ademove Ltd | Dagenham | 2015 |
| Ademy Ltd | London | 2018 |
| Aden Projects Ltd | Glasgow | 2003 |
| Aden Security Locksmiths Limited | Bexley | 2005 |
| Aden Travels Ltd | Birmingham | 2025 |