| A.Q.I Consultancy Ltd | High Wycombe | 2017 |
| A.R Developments (Midlands) Ltd | Bridgnorth | 2018 |
| A.R. Betteridge Limited | Sidcup | 1973 |
| A.R. Cook Holdings Ltd | Maidstone | 2018 |
| A.R. Manley & SON Holdings Limited | Nr.Shrewsbury | 1957 |
| A.R. Richards (Holdings) Limited | Market Drayton | 2025 |
| A.R.D Holds Ltd | Morden | 2024 |
| A.R.D. Consultancy Limited | Falkirk | 2007 |
| A.R.D.H. Investments Ltd | Cardiff | 2019 |
| A.R.E. Business & Professional Limited | London | 1998 |
| A.R.Geo Holdings Limited | Faringdon | 2024 |
| A.R.H Holdings 2 Ltd | London | 2025 |
| A.R.M. Services Group Limited | London | 1999 |
| A.R.Owen Insurance Services Limited | Haltwhistle | 2009 |
| A.R.S.O Limited | Shrewsbury | 2025 |
| A.R.T Waterfront Holdings Limited | Maghull | 2021 |
| A.R.Twigden Limited | Spalding | 2021 |
| A.Ryland & Co Ltd | South Croydon | 2024 |
| A.S Mortgage Broker Ltd | Cardiff | 2019 |
| A.S Mortgage Solutions Ltd | Peterborough | 2024 |
| A.S. Crawford Holdings Limited | Dunfermline | 2008 |
| A.S. Temple Services Ltd | London | 2023 |
| A.S.A.P Financial Services Limited | London | 2005 |
| A.S.C. Investing Limited | Bristol | 2025 |
| A.S.E. Insurance Agency (UK) Limited | London | 1996 |
| A.S.G. Fabrications (Holdings) Limited | Batley | 2023 |
| A.S.J. Financial Services Limited | Leicester | 1989 |
| A.S.K. (RAD) Lendco Limited | London | 2026 |
| A.S.K. Leumi Finco Limited | London | 2025 |
| A.S.K. Partners Agent Limited | London | 2018 |
| A.S.K. Partners FS Limited | London | 2025 |
| A.S.K. Partners Lendco a Limited | London | 2024 |
| A.S.K. Partners Lendco B Limited | London | 2024 |
| A.S.K. Partners Lendco C Limited | London | 2024 |
| A.S.K. Partners Lendco D Limited | London | 2024 |
| A.S.K. Partners Lendco E Limited | London | 2024 |
| A.S.K. Partners Lendco F Limited | London | 2024 |
| A.S.K. Partners Lendco G Limited | London | 2024 |
| A.S.K. Partners Lendco H Limited | London | 2025 |
| A.S.K. Partners Lendco I Limited | London | 2025 |
| A.S.K. Partners Lendco J Limited | London | 2025 |
| A.S.K. Partners Lendco K Limited | London | 2025 |
| A.S.K. Partners Lendco Limited | London | 2020 |
| A.S.K. Partners Lendco X Limited | London | 2025 |
| A.S.K. Partners Lendco Z Limited | London | 2025 |
| A.S.K. Partners Rcfco Limited | London | 2022 |
| A.S.K. Partners SPC Limited | London | 2023 |
| A.S.N.R. Holdings Limited | Ayr | 2010 |
| A.S.P. Confidential Ltd. | Bradford | 2002 |
| A.S.S Developments Limited | Birmingham | 2022 |
| A.Shields Group Limited | Spalding | 2026 |
| A.Suthrell & Partners Limited | Grimsby | 1963 |
| A.T. Kearney Holdings Limited | London | 2005 |
| A.T. Sheds & Fencing (Holdings) Limited | Kingswinford | 2023 |
| A.T. Shoal Limited | Stoke Poges | 2023 |
| A.T. Technology Limited | Axminster | 2007 |
| A.T. Watkinson 2024 Ltd | London | 2024 |
| A.T.A Industries Ltd | Windsor | 2026 |
| A.T.K. Holdings Limited | Blairgowrie | 2017 |
| A.T.L. Industries Limited | Ashton Under Lyne | 1996 |
| A.T.L. Investments Limited | London | 1959 |
| A.T.M Sports Investments Ltd | Tredegar | 2026 |
| A.U Capital Limited | London | 2026 |
| A.U. Group Brokers Limited | London | 2014 |
| A.V.Wilding (Hooton) Ltd | Ellesmere Port | 2022 |
| A.Varghese & SON Limited | London | 2019 |
| A.W. Champion Holdings Limited | New Malden | 2003 |
| A.W. Jenkinson Holdings Limited | Penrith | 2015 |
| A.W. Lymn Green Energy Limited | Nottingham | 2022 |
| A.W.Dallas Financial Services Limited | Cardiff | 2008 |
| A.Waugh Inspections Ltd | Lincoln | 2017 |
| A.Welton Holdings Limited | Manchester | 2023 |
| A.Z. Motors Limited | London | 1938 |
| A/F Nordica Ltd | London | 2026 |
| A/O UK 1 Limited | London | 2019 |
| A/O VC UK Limited | London | 2021 |
| A01 Holdco Limited | London | 2021 |
| A1 Adas Group Holdings Limited | Skelmersdale | 2024 |
| A1 Approved Holdings Ltd | Leeds | 2025 |
| A1 Capital Holdings Limited | Stanford-Le-Hope | 2022 |
| A1 Capital Limited | Wetherby | 2007 |
| A1 Commercial Holdings Ltd | Enniskillen | 2021 |
| A1 Consultancy Services Limited | Wolverhampton | 2003 |
| A1 CSD Limited | Eastbourne | 2018 |
| A1 CWM Investments Ltd | Liverpool | 2023 |
| A1 Electrical Holdings Ltd | Leicester | 2022 |
| A1 Finance Solutions Ltd | Ilford | 2025 |
| A1 Financial Services Ltd | Wokingham | 2026 |
| A1 Financial Solutions Ltd | Edinburgh | 2004 |
| A1 Forward Limited | Eastleigh | 2019 |
| A1 Glass & Glazing Holdings Limited | Telford | 2022 |
| A1 Group Holdings (NW) Ltd | Bolton | 2026 |
| A1 Holdco Ltd | Northampton | 2024 |
| A1 Holding Group Ltd | Harrow | 2023 |
| A1 Holdings (Cardiff) Ltd | Caerphilly | 2016 |
| A1 Holdings (London) Limited | Shirley, Solihull | 2023 |
| A1 Insurance Services Limited | York | 1988 |
| A1 Invest Ltd | London | 2012 |
| A1 Lending Ltd | Harrow | 2019 |
| A1 Lifestyle Book-Keeping Ltd | St. Neots | 2005 |