| Adam Mobile Ltd | Manchester | 2017 |
| Adam Murby Limited | London | 2025 |
| Adam Parkinson Ltd | Llandudno | 2021 |
| Adam Plaice Limited | Pontefract | 2016 |
| Adam Plastics Limited | Glasgow | 1998 |
| Adam Read Ltd | Axbridge | 2019 |
| Adam Smith School of Business and Management Limited | Glasgow | 2004 |
| Adam SON & Co. Ltd | Bradford | 2020 |
| Adam Store Invest Limited | London | 2024 |
| Adam Store Sweden Limited | London | 2024 |
| Adam Street Group Limited | Cardiff Bay | 2015 |
| Adam Ventures Limited | Southsea | 2012 |
| Adamantis S.R.L. Ltd | London | 2019 |
| Adams Amusements Limited | Hull | 1960 |
| Adams and Adams Property Limited | Marlow | 2025 |
| Adams Controls Limited | Beckenham | 2020 |
| Adams Garage Aylesbury | Aylesbury | 1947 |
| Adams Garage Limited | Aylesbury | 1984 |
| Adams New Media Limited | Greenford | 2008 |
| Adams Pork Products Limited | Uxbridge | 1969 |
| Adams Used Cars for Sale Limited | Sheffield | 2022 |
| Adams Waste Limited | Fareham | 2000 |
| Adams-Cairns Limited | Godalming | 2012 |
| Adamson Consultancy Services Ltd | St. Austell | 2014 |
| Adamson DEL 4 Limited | Salford Quays | 2004 |
| Adamson Waste Limited | Manchester | 2021 |
| Adamson's Turf Machinery Limited | Ripon | 1949 |
| Adana Investments Ltd | Jesmond | 2009 |
| Adani Power Limited | Ilford | 2015 |
| Adans Services Ltd | London | 2019 |
| ADANUS01 Ltd | London | 2025 |
| Adapt Golf Ltd | London | 2023 |
| Adapt Roofing Ltd | New Malden | 2026 |
| Adaptavate Innovations Limited | Ashbourne | 2016 |
| Adaptive Change Limited | Worksop | 2024 |
| Adaptive Health and Safety Limited | Darlington | 2021 |
| Adaptive HR Limited | Darlington | 2021 |
| Adaptix Animal Care UK Limited | Witney | 2022 |
| Adaptix IDT UK Limited | Witney | 2022 |
| Adaptix Medical UK Limited | Witney | 2022 |
| Adaptix NDE UK Limited | Witney | 2022 |
| Adaptmyhome Limited | Cardiff | 2016 |
| Adasail Ltd | London | 2024 |
| Adata Marine Limited | Blackpool | 2024 |
| Adawall Limited | Chippenham | 2017 |
| ADB Stage and Studio Lighting Limited | Farnham | 1991 |
| ADB W&G Services Limited | Luton | 2021 |
| Adbeck Ltd | Blyth | 2016 |
| ADC Accountants (South West) Ltd | Plymouth | 2015 |
| ADC Communications (UK) Ltd. | Swindon | 1978 |
| Adci EOT Ltd | Nottingham | 2025 |
| Adcocks Trustee Company Limited | Lichfield | 2019 |
| Adcrest Limited | Royston | 1975 |
| Adcroft Developments Limited | Holywood | 2016 |
| ADD 5019 Ltd | Dronfield | 2015 |
| ADD Impact Limited | Felixstowe | 1995 |
| ADD Limited | South Croydon | 2008 |
| ADD That Little Extra Group Limited | Surbiton | 2016 |
| ADD That Little Extra International Limited | Surbiton | 2016 |
| ADD Wealth Estate Planning Limited | South Croydon | 2014 |
| Add-Venture Advisory Ltd. | Bournemouth | 2019 |
| Addaction Limited | London | 2019 |
| Adde Technology Co., Ltd | Beckenham | 2014 |
| Added Nominees Limited | Salford | 2004 |
| Added Value Ltd | Swansea | 2020 |
| Addeelia Management Company Limited | Belfast | 2005 |
| Adderley Village Hall Bar Ltd | Market Drayton | 2009 |
| Adderstone Group Limited | Newcastle Upon Tyne | 2018 |
| Adderstone Limited | Newcastle Upon Tyne | 2019 |
| Addev Parafix Ltd | Lancing | 2025 |
| Addex Innovation Technologies Ltd | Cardiff | 2020 |
| Addex Trading Ltd | Hereford | 2007 |
| Addicted to Desserts Ltd | Nottingham | 2021 |
| Addiction London Ltd | London | 2019 |
| Addie's Party Squad Ltd | Harlow | 2020 |
| Addingstone Group Limited | London | 2019 |
| Addington Road Care Limited | Peterborough | 2025 |
| Addinstown Investments Limited | Manchester | 2021 |
| Addisg Ltd | London | 2022 |
| Addison & Steele Tailoring Limited | Leeds | 2000 |
| Addison Engineering Limited | Thornton Cleveleys | 2018 |
| Addison Grace Limited | Mitcham | 2023 |
| Addison Imperial Ltd | Barnard Castle | 2020 |
| Addison Lambert Ltd | Gateshead | 2015 |
| Addison LEE Payments Limited | London | 2019 |
| Addison Mortgage Services Limited | Kent | 2003 |
| Addison Projects Limited | Thornton Cleveleys | 2018 |
| Addison Service Company Limited | Lytham | 2014 |
| Addisonwoods Ltd | Hemel Hempstead | 2024 |
| Addition Corporate Services Limited | Penzance | 2011 |
| Additions Accounting Services Limited | Hoylake | 2007 |
| Addleshaw Goddard (Hong Kong) Limited | Manchester | 2021 |
| Addlestone Trading Limited | West Byfleet | 2024 |
| Addo Arts Limited | Edgware | 2014 |
| Addomi Limited | Elstree | 2013 |
| Addrate Limited | Kenilworth | 2019 |
| Address Intelligence Limited | London | 2016 |
| Address Marine Ltd | London | 2025 |
| Adds UP Bookkeeping & Accountancy Services Ltd | Gainsborough | 2023 |
| Addsorb Limited | Leigh | 2001 |