| AIG Uzbekinvest Limited | London | 1994 |
| Aiger Group Limited | Bury St. Edmunds | 2021 |
| Aiger Investments Ltd | Bury St. Edmunds | 2021 |
| Aigg Holdings Ltd | Dartford | 2014 |
| Aigornetto Limited | London | 2018 |
| Aiguille Investments Ltd | Swatragh | 2021 |
| AIH Bidco Limited | London | 2025 |
| AIH Holdco Limited | London | 2025 |
| AIH Midco Limited | London | 2025 |
| AIH Topco Limited | London | 2025 |
| AIH Trackerco Limited | London | 2025 |
| AIH Upper Bidco Limited | London | 2025 |
| Aihi UK Limited | London | 2016 |
| Aihourly IO Ltd | London | 2025 |
| Aihourly Trade Ltd | Liverpool | 2025 |
| Aihua Holding Ltd | Edinburgh | 2024 |
| AII Corporation UK Ltd | London | 2026 |
| Aiic Group Limited | Peterborough | 2025 |
| Aiic Groupco 1 Ltd | Peterborough | 2012 |
| Aiic Holdings Limited | Peterborough | 2015 |
| Aiig UK Limited | London | 2020 |
| Aijef Limited | Chester | 2025 |
| Aika Asset Management Limited | London | 2025 |
| Aiken Advisors Limited | London | 2020 |
| Aikg Holdings Ltd | Glasgow | 2024 |
| Aiki Capital Ltd | London | 2024 |
| Aikima Holdings Ltd | London | 2023 |
| Aikmo Care (Holdings) Ltd | Sale | 2025 |
| Aikmo Group Limited | Sale | 2025 |
| Aikon Digital Solutions Ltd | Mayfair | 2017 |
| Aikon Investments Ltd | Mayfair | 2015 |
| Aikya Investment Management Limited | London | 2019 |
| AIL Beta Holding Limited | Doncaster | 2001 |
| Ailehpo Capital Ltd | Windsor | 2023 |
| Ailes Mortgage Solutions Ltd | Solihull | 2020 |
| Ailesbury Limited | Birmingham | 2016 |
| Ailey Investments Limited | Hatfield | 2022 |
| Ailist (Holdings) Limited | Liverpool | 2019 |
| Ailm Holdings Ltd | Crawley | 2025 |
| Ailon (Plaistow) Limited | London | 2024 |
| Ailsa 25 Limited | Glasgow | 2023 |
| Ailsa Finance Limited | Girvan | 2025 |
| Ailsa Group Ltd | Kilwinning | 2025 |
| Ailsa Property Advisory Limited | Addlestone | 2015 |
| Ailspin Holdings Limited | Arbroath | 2021 |
| Ailsworth Capital Ltd | Luton | 2026 |
| AIM Financial Services Limited | Keith | 2024 |
| AIM & Prosper Ltd | Leicester | 2015 |
| AIM 11 Ltd | Derby | 2024 |
| AIM Applications Holdings Limited | Burnley | 2018 |
| AIM Asset Management Ltd | Stroud | 2018 |
| AIM Aurora Limited | Bristol | 2019 |
| AIM Cube Limited | London | 2019 |
| AIM Equities Limited | Preston | 2025 |
| AIM Financial Solutions Limited | Bodmin | 2019 |
| AIM for Ready-Made Clothes, Sportswear and Sweets Ltd | London | 2025 |
| AIM Group UK (Holdings) Ltd | Falkirk | 2021 |
| AIM Health Holdings Ltd | Wirral | 2023 |
| AIM HI Investments Ltd | Cannock | 2015 |
| AIM Higher Group Limited | London | 2024 |
| AIM Higher Mortgages & Protection Ltd | Ripon | 2026 |
| AIM Hold Ltd | Morden | 2025 |
| AIM Holdings London Ltd | London | 2025 |
| AIM House Investments Limited | Sidcup | 2014 |
| AIM Investment Group Ltd | Dudley | 2026 |
| AIM Investment Holdings Limited | Bristol | 2025 |
| AIM Ireland Limited | Bristol | 2022 |
| AIM Legacy Holdings Ltd | Huddersfield | 2026 |
| AIM Legal Expenses Insurance Services Limited | Chorley | 1999 |
| AIM Mortgages Ltd | Bristol | 2023 |
| AIM Opulent Limited | Ruislip | 2020 |
| AIM Paraplanning Ltd | Lymm | 2016 |
| AIM Partners Limited | London | 2003 |
| AIM Risk Services Limited | Dorking | 2012 |
| AIM Security Services Ltd | Pontypridd | 2024 |
| AIM Strategic Holdings Ltd | Glasgow | 2025 |
| AIM to Claim Europe Limited | Uckfield | 2016 |
| AIM to Recycle Limited | Gateshead | 2001 |
| AIM Trading Limited | London | 2020 |
| AIM Wealth Ltd | Taunton | 2026 |
| AIM Whitening Limited | Glasgow | 2024 |
| Aim-Tti Holdings Limited | Huntingdon | 2013 |
| Aima Investments Ltd | Stockport | 2022 |
| Aimaevents Ltd | London | 2019 |
| Aimagine Trading Limited | London | 2024 |
| Aimd Investment Ltd | Benfleet | 2025 |
| Aimee Financial Ltd | Durham | 2019 |
| Aimee Garraway Independent Mortgage Solutions Ltd | Rainworth | 2020 |
| Aimee Holdings Limited | Harrow | 2025 |
| Aimee Investment Co. Ltd | London | 2023 |
| Aimee Kyle Mortgages Ltd | Strathaven | 2023 |
| Aimeloglou Ltd | London | 2024 |
| Aimfx Ltd | Bradford | 2026 |
| Aimhub Ltd | Warrington | 2015 |
| Aimium Corp Limited | London | 2021 |
| Aimk Limited | Bradford | 2017 |
| Aimpoint Wealth Partners Ltd | Woking | 2014 |
| Aimpro Services Ltd | Farnborough | 2026 |
| Aims AFB Ltd | Ashford | 2023 |
| Aims Financial Limited | Ashford | 1997 |