| Auxilium Family Office Limited | Sutton | 2023 |
| Auxilium Holdings I Limited | London | 2025 |
| Auxilium Holdings II Limited | Hayes | 2025 |
| Auxilium Partnership Limited | Derby | 2018 |
| Auxillis Limited | Darlington | 1994 |
| Auxillium Property Holdings Ltd | Caerphilly | 2025 |
| Auxo Group (Midco) Limited | Uxbridge | 2021 |
| Auxo Group Holdings Limited | Uxbridge | 2019 |
| Auxo Holdings Ltd | Nottingham | 2021 |
| Auzano Capital Management Limited | Oxford | 2021 |
| AV & JV Holdings Limited | Belper | 2023 |
| AV Advisors UK Limited | Westcliff-On-Sea | 2023 |
| AV Chohan Ltd | Cheltenham | 2026 |
| AV Consultancy Ltd | London | 2015 |
| AV Equity Trading Limited | Cardiff | 2012 |
| AV Global Group Limited | Worcester | 2022 |
| AV Holdco Ltd | Stevenage | 2025 |
| AV HYD Holdings Limited | Newcastle-Under-Lyme | 2016 |
| AV I (Scotland) Ltd | Edinburgh | 2019 |
| AV II (England) Ltd | London | 2022 |
| AV Iii-A (England) Ltd | London | 2025 |
| AV Iii-B (England) Ltd | London | 2025 |
| AV Mortgage Solutions Ltd | March | 2024 |
| AV Poland Ltd | London | 2023 |
| AV Property & Investments Limited | London | 2025 |
| AV Terra Industrial Ltd | London | 2025 |
| AV Tomson Holdings Ltd | Nottingham | 2024 |
| AV Trinity Holdings Limited | Tunbridge Wells | 2025 |
| AV Trinity Limited | Kent | 1986 |
| AV Ubique Holding Limited | Leicester | 2026 |
| AV Wealth Management Ltd | Leicester | 2025 |
| Av-Me Holdings Limited | Walsall | 2022 |
| AVA Capital Management Ltd | London | 2018 |
| AVA ESH Holdings Ltd | London | 2025 |
| AVA Futures Limited | London | 2026 |
| AVA Insure Limited | London | 2013 |
| AVA Medical UK Holdings Ltd | London | 2025 |
| AVA Recreation Holdings Limited | Eastleigh | 2024 |
| AVA Rose Mortgages Ltd | Robertsbridge | 2025 |
| AVA Wealth Ltd | Nottingham | 2024 |
| AVA Works Ltd | West Drayton | 2025 |
| Avaani Holdings Ltd | Aylesford | 2023 |
| Avaantara Ltd | London | 2024 |
| Avaaya Capital Limited | London | 2024 |
| Avaaya Holdings Limited | London | 2024 |
| Avaaya Limited | London | 2025 |
| Avaaya Risk Management Limited | London | 2025 |
| Avacade Limited | Manchester | 2010 |
| Avacobs Services Limited | Thornton-Cleveleys | 2018 |
| Avad Investments Limited | Ammanford | 2018 |
| Avada Group Limited | Chesterfield | 2025 |
| Avado Holdings Limited | London | 2007 |
| Avado Learning (UK) Limited | London | 2010 |
| Avag Limited | Nottingham | 2021 |
| Avahope Limited | Leeds | 2025 |
| Avais Holdings Ltd | Manchester | 2024 |
| Avaish Wealth Management Limited | Leicester | 2023 |
| Aval Group Ltd | Harrow | 2019 |
| Avalana Ventures Ltd | Gloucester | 2025 |
| Avalanche Capital Limited | Solihull | 2015 |
| Avalanche Development Services Limited | Solihull | 2015 |
| Avalen Partners Limited | Woodford Green | 2026 |
| Avalere Health Finco Limited | London | 2019 |
| Avalere Health Midco 1 Limited | London | 2019 |
| Avalere Health Midco 2 Limited | London | 2019 |
| Avalere Health Topco Limited | London | 2019 |
| Avalere Health UK Bidco Limited | London | 2019 |
| Avalex AM Consultancy Ltd | London | 2025 |
| Avalle UK Limited | Northampton | 2024 |
| Avalon Bidco Limited | Salford | 2026 |
| Avalon Buyer Limited | Bangor | 2025 |
| Avalon Capital Markets Limited | London | 2014 |
| Avalon Capital Partners Limited | London | 2011 |
| Avalon Care Group Limited | London | 2022 |
| Avalon Consulting Ltd | East Grinstead | 2026 |
| Avalon DNA Group Limited | Leighton Buzzard | 2026 |
| Avalon Electronics Holdings Limited | Bath | 2018 |
| Avalon Entertainment Limited | | 2006 |
| Avalon ER Ltd | Rotherham | 2025 |
| Avalon Financial Associates Ltd | Southampton | 2009 |
| Avalon Financial Limited | London | 2025 |
| Avalon Financial Services Limited | Dorset | 1998 |
| Avalon Financial Solutions Ltd | Southampton | 2018 |
| Avalon FS Ltd | Doncaster | 2020 |
| Avalon Group Holdings Limited | Harrow | 2017 |
| Avalon Innovation Group Limited | Bristol | 2023 |
| Avalon Investment Services (Nominees) Limited | London | 1999 |
| Avalon Midco Limited | Bangor | 2025 |
| Avalon Motor Co Holdings Limited | Glastonbury | 2024 |
| Avalon Options Limited | Haywards Heath | 2011 |
| Avalon Payroll Limited | Manchester Road | 2017 |
| Avalon Sipp Trustees Limited | London | 2005 |
| Avalon Topco Limited | Salford | 2026 |
| Avalon UK Services Ltd | London | 2025 |
| Avalon Ventures Holdings Ltd | Colchester | 2018 |
| Avaloncrest Limited | Greenford | 1998 |
| Avalt Limited | Reigate | 2026 |
| Avamax Group Limited | Fareham | 2024 |
| Avamore Capital Bridging Limited | Southend-On-Sea | 2017 |
| Avamore Capital Limited | London | 2015 |