| AST UK Holdco Limited | London | 2024 |
| AST UK Holdings Ltd | Maidenhead | 2022 |
| Ast-Aar Capital Investment Limited | London | 2026 |
| Asta ERA Ltd | Birmingham | 2023 |
| Asta Insurance Services Ltd | London | 1988 |
| Asta Investment Advisors Ltd | Tonbridge | 2019 |
| Asta Managing Agency Ltd | London | 1985 |
| Asta Property Limited | Ickenham | 2019 |
| Asta Underwriting Management Ltd | London | 2014 |
| Astaan Remit Ltd | Ealing | 2023 |
| Astaara Underwriting UK Limited | London | 2020 |
| Astan Group Holdings Ltd | Stone | 2025 |
| Astapor Holdings Limited | London | 2015 |
| Astar Innovations Limited | Lincoln | 2026 |
| Astar Research Ltd | Harrogate | 2026 |
| Astareh Holdings Ltd | Southampton | 2026 |
| Astaris Capital Mgmt (UK) Ltd | London | 2008 |
| Astarti One Limited | London | 2022 |
| Astbury Accountants Holdings Limited | Bridgnorth | 2009 |
| Astbury Hall Limited | Bridgnorth | 2018 |
| Astbury Lodge Financial Services Limited | London | 2004 |
| Astec Holdings (UK) Limited | Battle | 2013 |
| Astectherm International Ltd | Grimsby | 2017 |
| Astel Africa Group Ltd | Harrow | 2015 |
| Astell Limited | London | 2022 |
| Astella Asset Management Holdings Limited | London | 2026 |
| Astella Capital Limited | London | 2015 |
| Aster Point Holdings Limited | London | 2026 |
| Aster Ventures Limited | Chester | 2021 |
| Asterbridge Technologies Limited | London | 2009 |
| Astere Group Ltd | Nantwich | 2026 |
| Asteri RE Limited | London | 2024 |
| Asteria Group Holdings Limited | Edgware | 2023 |
| Astering Capital Ltd | Ashford | 2017 |
| Asterion Gate Limited | Basingstoke | 2026 |
| Asteris UK Holdings Ltd | Swansea | 2026 |
| Asterisk Holding Ltd | London | 2023 |
| Astero Falcon Services Limited | Norwich | 2025 |
| Asteroid Global Limited | Warwick | 2023 |
| Asteron Group Ltd | London | 2026 |
| Asterope Ltd | London | 2014 |
| Astflick Holdings Ltd | Huntingdon | 2025 |
| Astfx Trading Ltd | London | 2025 |
| Asth & Funkti Limited | Cardiff | 2020 |
| Astin Capital Management Limited | London | 2001 |
| Astir Capital Advisors Limited | Reading | 2009 |
| Astir Holdings Limited | London | 2021 |
| Astitva Properties Ltd | London | 2021 |
| Astley (1919) Co Ltd | Bolton | 2025 |
| Astley Consultancy (NO. 2) Ltd. | Wallasey | 2017 |
| Astley Management Company Limited | London | 2026 |
| Astley Projects Holdings Limited | Manchester | 2026 |
| Astmoor Finance Ltd | Towcester | 2019 |
| Astolat Capital Ltd | London | 2025 |
| Astolat Investment Group Limited | London | 2025 |
| Aston & Bradley Insurance Services Ltd | Birmingham | 2013 |
| Aston & Co Financial Services Ltd | Wigston | 2013 |
| Aston & Smith Mortgage Services Ltd | Corby | 2004 |
| Aston Alloys Holdings Limited | Stafford | 2025 |
| Aston Brooks International Sandhu & Wurmser Ltd | Gerrards Cross | 2013 |
| Aston Children's Care Holdings Limited | London | 2022 |
| Aston Commercial Finance Limited | Leeds | 2023 |
| Aston COX Property Limited | Morecambe | 2016 |
| Aston Currency Management Limited | London | 2013 |
| Aston Financial Ltd | Tattenhall | 2006 |
| Aston Financial Services Limited | Norfolk | 2005 |
| Aston Fintech One Limited | London | 2024 |
| Aston Fintech Two Limited | London | 2024 |
| Aston Group Holdings Limited | Stevenage | 2018 |
| Aston Group Limited | Great Yarmouth | 2014 |
| Aston Holdings NE Ltd | Gateshead | 2025 |
| Aston Investment Group Ltd | Cowbridge | 2023 |
| Aston Lark (Topco) Limited | London | 2017 |
| Aston Legal Ltd | Huddersfield | 2009 |
| Aston Levene & Britton Ltd | Leicester | 2021 |
| Aston Miller Limited | Larkhall | 2012 |
| Aston Mowbray Ltd | Farnham | 2010 |
| Aston Park Fisheries (Sheffield) Limited | Sheffield | 2006 |
| Aston Reeve Limited | Pinner | 2018 |
| Aston Reinvestment Guarantee Company Ltd | Birmingham | 1989 |
| Aston Risk Management Limited | Ellesmere Port | 2012 |
| Aston Rothbury PLC | Brentwood | 1993 |
| Aston Spencer Group Limited | London | 2023 |
| Aston Steele Investments Limited | Hartfield | 2017 |
| Aston UK Holdings Ltd | Honiton | 2022 |
| Aston Wealth Management Limited | London | 2010 |
| Aston-An Limited | Epping | 2020 |
| Astondown Capital Limited | London | 2015 |
| Astondown Investments Ltd | London | 2007 |
| Astor Holdco Limited | London | 2026 |
| Astor Holdings Limited | Saffron Walden | 2023 |
| Astor Investments Ltd | London | 2020 |
| Astor Place Ltd | London | 2026 |
| Astor Specialty Limited | London | 2017 |
| Astor-Bannerman Management Topco Limited | Cheltenham | 2021 |
| Astora Holdings Ltd | London | 2026 |
| Astorg LDP Limited | London | 2022 |
| Astoria Global Holdings Ltd | Ruislip, | 2026 |
| Astra 365 UK Investments Limited | London | 2014 |
| Astra Asset Holdings Limited | London | 2018 |