| Adare International LNC Limited | London | 2017 |
| Adastra 111 Limited | London | 2017 |
| Adastra Holdings Ltd | Glasgow | 2023 |
| Adatech Venture Ltd | Chessington | 2023 |
| Adatis Group Limited | Farnham | 2019 |
| Adaurum Limited | Watlington | 2004 |
| Adaurus Limited | Colgate | 2008 |
| Adavi Investments Ltd | London | 2018 |
| Adavos Group Ltd | Grays | 2019 |
| Adaxia (GP1) Limited | London | 2015 |
| Adaxia 2015 Limited | London | 2015 |
| Adaxia Capital Private Equity (GP) Limited | London | 2007 |
| Adaxia Scotland GP Limited | Edinburgh | 2015 |
| Adaxs Global Investment Limited | Camberwell London | 2007 |
| ADB and Partners Limited | Birmingham | 2023 |
| ADB Associates Limited | Norwich | 2025 |
| ADB Construction Limited | Old Knebworth | 2016 |
| ADB Familyco | Leeds | 2018 |
| ADB Finance Ltd | Oldham | 2016 |
| ADB Freehold Limited | Halstead | 2021 |
| ADB Global Ltd | Halstead | 2018 |
| ADB Group Limited | Middlesborough | 2025 |
| ADB Holdco Ltd | Towcester | 2024 |
| Adbac Investments Limited | Durham | 2022 |
| Adban Limited | Manchester | 2019 |
| Adbm Holdings Limited | Staines-Upon-Thames | 2017 |
| Adbn Limited | Whitstable | 2020 |
| ADC Consult Limited | Leckhampstead | 2012 |
| ADC Surrey Ltd | Esher | 2004 |
| Adca Investments Limited | London | 2010 |
| Adcapital Partners Ltd | London | 2017 |
| Adcas Financial Management Limited | Blackpool | 2002 |
| Adcl Haulage Limited | Valley Ent Pk Barrow, Clitheroe | 2007 |
| Adco Asset Holdings Ltd | Grimsby | 2025 |
| Adco Group Ltd | Grimsby | 2025 |
| Adco Investments Limited | Warrington | 2018 |
| Adcobs Limited | London | 2019 |
| Adcock Accounting Limited | Nottingham | 2021 |
| Adcock Financial Limited | Nottingham | 2001 |
| Adcorp Capital Ltd | London | 2014 |
| Adcott Financial Ltd | Middlesbrough | 2020 |
| ADD Capital Finance Limited | Wimborne | 2005 |
| ADD Capital Investments Limited | London | 2022 |
| ADD Holdings Limited | London | 2021 |
| ADD Mortgage Advice Ltd | Broadstairs | 2020 |
| ADD Mortgages Limited | South Croydon | 2008 |
| ADD Wealth Management Limited | South Croydon | 2010 |
| Add-Value Properties Ltd | London | 2019 |
| Adda Investment Limited | London | 2015 |
| Addair Holdings Limited | Orpington | 2020 |
| Addaptive Group Holdings Limited | Hitchin | 2020 |
| Addax Holdings Limited | Walsall | 2022 |
| Addblend Limited | Horsham | 1999 |
| Addbudget Limited | London | 1994 |
| Addcas Limited | Bromsgrove | 2023 |
| Added Dimension Events Holdings Limited | Tadley | 2005 |
| Added Value Accounting Services Ltd | Leven | 2010 |
| Added Value Consulting Limited | Witham | 2005 |
| Added Vision Limited | Wimborne | 2020 |
| Addems Capital Ltd. | Waterlooville | 2026 |
| Addendum Limited | London | 2020 |
| Addept Group Limited | Colchester | 2024 |
| Addept Insurance Services Ltd | London | 2012 |
| Adder Trustees Limited | Cambridge | 2025 |
| Adderbury Cotswolds Limited | London | 2025 |
| Adderbury Resorts Limited | Banbury | 2025 |
| Addergoole Investments Limited | Chislehurst | 2017 |
| Adderley Green Medical Group Limited | Stoke On Trent | 2021 |
| Adderley Park Ltd | Solihull | 2025 |
| Adders Holdings Ltd | Newport Pagnell | 2026 |
| Adderstone (200) Limited | Newcastle Upon Tyne | 2019 |
| Adderstone (Falkland Islands) Limited | Newcastle Upon Tyne | 2024 |
| Adderstone 1993 Limited | Newcastle Upon Tyne | 2000 |
| Adderstone Commercial Holdings Limited | Newcastle Upon Tyne | 2025 |
| Adderstone Construction (North East) Limited | Newcastle Upon Tyne | 2024 |
| Adderstone Finance Limited | Newcastle Upon Tyne | 2019 |
| Adderstone Holdings Limited | Newcastle Upon Tyne | 2022 |
| Adderstone Living (UK) Limited | Newcastle Upon Tyne | 2023 |
| Addictive AMP Holdings Limited | Finchley | 2011 |
| Addiewell Prison (Holdings) Ltd | Aberdeen | 2005 |
| Addingstone Insurance Solutions Ltd | London | 2008 |
| Addington Cole Group Ltd | Harrow | 2020 |
| Addington Finance Ltd | West Horndon | 2024 |
| Addington Selsdon Ltd | South Croydon | 2024 |
| Addis Farm Holdings Limited | Droitwich | 2022 |
| Addis GD Ltd | London | 2025 |
| Addis Wingate Capital Limited | London | 2023 |
| Addiscombe Group Limited | London | 1993 |
| Addisland Enterprises Limited | Stanmore | 2017 |
| Addison Bradley & Co. Limited | London | 1985 |
| Addison Cameron Limited | Portsmouth | 2019 |
| Addison Capital Limited | Dorchester | 2014 |
| Addison Engineering (Holdings) Limited | Lytham St. Annes | 2019 |
| Addison Group Assets Ltd | Bromley | 2024 |
| Addison Group Holdings Limited | Lytham St. Annes | 2019 |
| Addison Holdco Limited | Stockton On Tees | 2025 |
| Addison Holdings Limited | London | 2018 |
| Addison LEE Financing Limited | London | 2013 |
| Addison LEE Group Limited | London | 2013 |
| Addison Mason Limited | Hitchin | 2022 |