| Addison Moore Holdings Limited | London | 2020 |
| Addison Road Holdings Ltd | Nottingham | 2026 |
| Addison Ross (Holdings) Limited | Bristol | 2023 |
| Addison Satchi Finance Limited | Redruth | 2016 |
| Addison Ventures Limited | Gloucester | 2026 |
| Addiss Holdings Limited | Willenhall | 2017 |
| Addition Coach GP Ltd | London | 2021 |
| Additional Securities Limited | | 1937 |
| Addlife Financial Ltd | Hemel Hempstead | 2020 |
| Addooco Technology Group Limited | Chesterfield | 2026 |
| Addplant Group Limited | Beverley | 2023 |
| Addr Advisors 1 Limited | Manchester | 2023 |
| Addr Labs Ltd | Manchester | 2024 |
| Addr Ventures Ltd | Manchester | 2023 |
| Addreax Group Limited | Cardiff | 2019 |
| Addreax Solutions Limited | Cardiff | 2019 |
| Address Investments Churchtown Ltd | Liverpool | 2023 |
| Addsecure UK Holdings Limited | London | 2017 |
| Addservice Limited | Poynton | 1990 |
| Addstack Holdings Limited | Wickford | 2019 |
| Addt Holdings Ltd | High Wycombe | 2020 |
| Addvance IT Holdings Limited | Derby | 2021 |
| Addwell Holdings Limited | Romford | 2024 |
| Addwest Limited | Norwich | 2011 |
| ADE Group Holdings Ltd | Bolton | 2022 |
| ADE UK Holding Limited | Liverpool | 2023 |
| ADE2 Limited | Enfield | 2024 |
| Adebanjo Equity Holdings Ltd | Brentwood | 2025 |
| Adecon Group Ltd | Bexley | 2023 |
| Adecyn's Group Limited | Wolverhampton | 2022 |
| Adeel Afzal Ltd | Rochdale | 2015 |
| Adeel Akhtar Ltd | Birmingham | 2018 |
| Adeer International UK Group Limited | London | 2025 |
| Adeer International UK Platform Limited | London | 2025 |
| Adejoke Olanrewaju Limited | Bexleyheath | 2019 |
| Adel Global Ltd | London | 2026 |
| Adel Investments Ltd | London | 2026 |
| Adel Wills Ltd | Otley | 2016 |
| Adelad Limited | London | 2014 |
| Adelante Asset Management Limited | Colchester | 2003 |
| Adelante Tech Solutions Limited | London | 2023 |
| Adelar Group Limited | Liverpool | 2025 |
| Adelar Investments Ltd | Oldbury | 2025 |
| Adelard Solutions Limited | Derby | 2025 |
| Adele UK Bidco 2 Limited | Chessington | 2020 |
| Adele UK Bidco Limited | Chessington | 2019 |
| Adele UK Holdco Limited | Chessington | 2019 |
| Adele UK Parentco Limited | Chessington | 2019 |
| Adelec Management Ltd | Poole | 2021 |
| Adeline Arts and Science Ltd | London | 2021 |
| Adelio Partners Limited | London | 2020 |
| Adeliza Capital Ltd | Loughton | 2023 |
| Adella Accounting Ltd | London | 2017 |
| Adelmar Limited | Bradford | 2017 |
| Adelp Financial Solutions Ltd | Lanark | 2013 |
| Adelpha Capital Ltd | London | 2016 |
| Adelpha Finance Ltd | London | 2016 |
| Adelpha Growth Holdings Ltd | London | 2019 |
| Adelpha Nominee Limited | London | 2020 |
| Adelphi Bramah Limited | Chesterfield | 2013 |
| Adelphi Capital Management Limited | London | 1997 |
| Adelphi Capital Partners Limited | London | 2026 |
| Adelphi Holdings Limited | Haywards Heath | 1999 |
| Adelphi Insurance Brokers Ltd. | Macclesfield | 2012 |
| Adelphi Investments (North West) Limited | Manchester | 2026 |
| Adelphi Partnership Consulting and Investment Services Ltd | London | 2021 |
| Adelphi Special Risks Limited | Macclesfield | 2013 |
| Adelphoi Holdings Limited | London | 2022 |
| Adelphus UK Ltd | Bedford | 2020 |
| Adeltisgroup Ltd | London | 2024 |
| Adelton Ltd | London | 2023 |
| Adelya Limited | Manningtree | 2018 |
| Ademco 2 Limited | London | 2018 |
| Ademco 4 Limited | London | 2018 |
| Ademt Limited | Newport | 2013 |
| Aden Electronics (Holdings) Limited | Ashford | 1997 |
| Adena Brands Ltd | London | 2020 |
| Adena Kent Limited | Tonbridge | 2019 |
| Adenium Commodities Ltd | Halifax | 2022 |
| Adenol Ltd | Cardiff | 2025 |
| Adenuga Ltd | London | 2015 |
| Adeona Limited | Leatherhead | 2008 |
| Adept Advisory Group Limited | West Byfleet | 2020 |
| Adept Advisory Services Limited | Leigh-On-Sea | 2020 |
| Adept Business Finance Limited | Cheltenham | 2023 |
| Adept Capital Holdings Ltd | Glasgow | 2025 |
| Adept Field Solutions Holdings Limited | Kingston Upon Thames | 2015 |
| Adept Finance Limited | Dunstable | 2021 |
| Adept Financial Planning Services Limited | Hants | 2007 |
| Adept Financial Solutions Ltd | Finchley | 2015 |
| Adept Group Holdings Limited | Witney | 2026 |
| Adept Investing Ltd | Whitby | 2015 |
| Adept Mortgages Ltd | Northampton | 2023 |
| Adept Partners Limited | Chipping Campden | 2018 |
| Adept Property and Investment Services Limited | Carrickfergus | 2016 |
| Adept Wealth Management Advisory Ltd | Mitcham | 2023 |
| Adept Wealth Management Limited | Colchester | 2018 |
| Adeptio Law (West Midlands) Limited | Wolverhampton | 2024 |
| Adeptio Law Group Limited | Wolverhampton | 2024 |
| Adeptio Law Holdco Limited | Wolverhampton | 2024 |