| Axon Steel Group Ltd | Leicester | 2026 |
| Axor Group Limited | Oxford | 2016 |
| Axora Ltd | Luton | 2026 |
| Axpo UK Trading Limited | London | 2008 |
| Axscend Group Limited | Runcorn | 2007 |
| Axstron Holdings Ltd | London | 2026 |
| Axsy Holding (UK) Ltd | London | 2013 |
| Axtel Capital Partners Limited | Hertford | 2026 |
| Axton Financial Ltd | Cheadle | 2018 |
| Axtrade Ltd | London | 2015 |
| Axum Trader Ltd | London | 2024 |
| Axure Contract Management Ltd | Woking | 2025 |
| Axus Capital Ltd | London | 2019 |
| Axus Holdings Limited | London | 2022 |
| Axxeltrova Limited | London | 2016 |
| Axxeltrova Partners Limited | London | 2022 |
| Axxis Financial Planning Ltd | Surrey | 2003 |
| Axylhomes Ltd | Newport | 2020 |
| Axzyra Holdings Limited | Litlington | 2024 |
| AY Bank Limited | Liverpool | 1980 |
| AY Capital Holdings Limited | London | 2025 |
| AY Financial Services Ltd | London | 2021 |
| AY Gold Company Ltd | London | 2023 |
| Ay&Sgestates Ltd | London | 2023 |
| AYA Asset Management Ltd | Farringdon | 2025 |
| AYA Healthcare UK Limited | London | 2023 |
| AYA Holdings SPV Limited | Halifax | 2024 |
| AYA MED Ltd | Nottingham | 2021 |
| AYA Sophia Holding Ltd | Hebden Bridge | 2021 |
| Ayaan Care Capital Limited | London | 2018 |
| Ayaan Holding Group Limited | Oldham | 2025 |
| Ayaan T Holdings Ltd | Birmingham | 2022 |
| Ayaan's Investment Group Ltd | Birmingham | 2020 |
| Ayaaz Limited | Rotherham | 2017 |
| Ayai Group Holdings Ltd | Weybridge | 2026 |
| Ayainvest Limited | Cardiff | 2018 |
| Ayak Actuarial Services Ltd | Greater Manchester | 2020 |
| Ayalay Limited | Pinner | 2025 |
| Ayam Holdings Limited | London | 2022 |
| Ayama Capital Ltd | London | 2025 |
| Ayams Group Holding Limited | Croydon | 2023 |
| Ayan Capital 1 Ltd | Manchester | 2024 |
| Ayan Capital 2 Ltd | Manchester | 2025 |
| Ayan Capital Holding Limited | London | 2025 |
| Ayan Investments Ltd | London | 2013 |
| Ayana Associates Ltd | London | 2016 |
| Ayana Investment Capital Limited | London | 2024 |
| Ayang Holdings Ltd | London | 2021 |
| Ayanthi Property Management Limited | London | 2019 |
| Ayasan Investments Ltd | Cheadle | 2023 |
| Ayat Enterprises Birmingham Ltd | Birmingham | 2022 |
| Ayat Management Services Ltd | Godalming | 2024 |
| Ayatuni Property Ltd | Leeds | 2025 |
| Ayax (UK) Acquisition Co. Ltd. | London | 2019 |
| Ayay Trading Ltd | Preston | 2025 |
| Aybirk Limited | Croydon | 2024 |
| Aybl Group Limited | Redditch | 2021 |
| AYC Holdings Limited | Radstock | 2023 |
| Aycliffe Asset Management Limited | Halifax | 2025 |
| Ayco 2002 Limited | London | 2024 |
| Ayda Technologies Limited | London | 2021 |
| Aydemir Holdings Limited | London | 2022 |
| Ayden Group Ltd | Manchester | 2019 |
| Aydin Holdings Limited | Leeds | 2018 |
| Aydon Holdings Ltd | King'S Lynn | 2022 |
| Aydya Holdings Limited | Dundee | 2025 |
| AYE KAY Group Ltd | Blackburn | 2023 |
| AYE Ltd | Billingham | 2025 |
| Ayel Holding Limited | London | 2020 |
| Ayelle Holdings Limited | Stevenage | 2025 |
| Ayersmont (H) Limited | Exeter | 2024 |
| Ayersmont Limited | Exeter | 1989 |
| Ayfjow Ltd | Newbury | 2019 |
| Ayfnb Limited | London | 2025 |
| AYG Group Holdings Ltd | Sheffield | 2025 |
| Aygee Limited | | 2006 |
| Ayima Holdings Limited | Leigh-On-Sea | 2016 |
| AYK Advisory Limited | Leicester | 2026 |
| Ayka Partners Limited | London | 2015 |
| Aykley Group Ltd | Durham | 2025 |
| Aykn Holdings Ltd | Hertfordshire | 2024 |
| Aykroyd and Sons Holdings Limited | Bala | 2017 |
| Ayla Daoud Holdings Ltd | Burnley | 2024 |
| Ayla Mortgages Ltd | Ringwood | 2020 |
| Ayladeen Holdings Limited | Bradford | 2020 |
| Aylard Consulting Limited | St. Albans | 2011 |
| Aylco Holdings Limited | Swanley | 2022 |
| Aylesbond Limited | London | 2022 |
| Aylesborne Holdings Ltd | Aylesford | 2025 |
| Aylesbury Mains (Holdings) Ltd | Whittlebury | 2018 |
| Aylescott Holdings Limited | London | 2018 |
| Ayli Real Estate Investments Ltd | London | 2019 |
| Aylim Capital Investments Ltd | London | 2017 |
| Aylim Capital Ltd | London | 2015 |
| Aylmer Capital Partners Limited | Stanmore | 2018 |
| Aylora Health Limited | Warwick | 2026 |
| AYM Central Ltd | London | 2023 |
| AYM Holdings Limited | Bury | 2024 |
| AYM Shafa Investments Limited | Cardiff | 2022 |
| Ayma Group Ltd | Glasgow | 2018 |