| AI Aware Ltd | London | 2025 |
| AI Courses Ltd | Newcastle Under Lyme | 2023 |
| AI Development Centre Ltd | Aldershot | 2026 |
| AI Devices Ltd | London | 2021 |
| AI Imports Ltd | Manchester | 2023 |
| AI Leaders Limited | London | 2023 |
| AI Nominees (UK) One Limited | London | 2023 |
| AI Nominees (UK) Two Limited | London | 2023 |
| AI RE DUI Import and Export Co., Ltd | London | 2024 |
| AI Scientific Limited | Harrogate | 2025 |
| AI Seed Nominees Limited | London | 2010 |
| AI SEO Ltd | Petersfield | 2015 |
| AI Tech Invest Ltd | Kington | 2013 |
| AI Tools Ltd | Newport | 2023 |
| AI Trading Group Ltd | Plymouth | 2024 |
| AI Training London Solution Ltd | Dover | 2024 |
| AI Voices Ltd | Bristol | 2021 |
| AI YI Trade Co., Limited | Kenilworth | 2019 |
| Ai-Gile Community Ltd | Milton Keynes | 2023 |
| Ai-P (AI With Purpose) Ltd | Bristol | 2026 |
| Ai-V (AI With Values) Ltd | Bristol | 2025 |
| AI4LIFE Ltd | Glasgow | 2023 |
| AIA Distributions Ltd | Manchester | 2023 |
| Aiai-Artificialintelligentassistantinlife Ltd | Doncaster | 2025 |
| Aiasst. Ltd | Cambridge | 2020 |
| AIB (Sutton Coldfield UK) (Ccmcc) (C.O.A. UK) Limited | Sutton Coldfield | 2019 |
| Aibor International Group Ltd | Kington | 2020 |
| Aibp 2 Limited | Kettering | 1986 |
| AIC Distribution Ltd | Weston-Super-Mare | 2014 |
| AIC Hydraulic & Pneumatic Co., Ltd | Beckenham | 2017 |
| AIC Information Services Limited | Greater London | 1985 |
| AIC SYS Limited | London | 2020 |
| AID Clinical Ltd | Nottingham | 2021 |
| AID2AFRICA.CO.UK Limited | | 2007 |
| Aida Shipping Limited | London | 2023 |
| Aida Trading Co., Ltd | Beckenham | 2022 |
| Aidan Quinn Solicitors Ltd | Dungannon | 2014 |
| Aide Trading Co Ltd | Cardiff | 2018 |
| Aide Xier (China) Import & Export Trade Ltd | Beckenham | 2024 |
| Aidees Ltd | London | 2016 |
| Aidem Ltd | Chorlton | 2021 |
| Aiden Associates Limited | St. Asaph | 2003 |
| Aiden International Trading Co., Ltd | Manchester | 2022 |
| Aiden Ltd | Harrogate | 2013 |
| Aidl International Limited | Birmingham | 2026 |
| Aidplus Source (UK) Co., Limited | Doncaster | 2005 |
| AIF Development Limited | Keighley | 2016 |
| Aifa Investment Ltd | Leicester | 2021 |
| Aigars Bridins Photography Limited | Dundee | 2022 |
| Aiibot Worlds Technology Limited | London | 2018 |
| AIJ Invest Limited | London | 2021 |
| Aike Investment Co., Ltd | Manchester | 2017 |
| Aikon Communications Ltd | Guildford | 2013 |
| Aila Bronte Co., Limited | West Midlands, England, | 2022 |
| Ailatan Group Ltd | London | 2024 |
| Aile Industrial Automation Co., Ltd | Beckenham | 2019 |
| Aile Medical Technology Limited | Beckenham | 2021 |
| Ailes Management, Ltd | London | 2019 |
| Ailis Technology Ltd | Beckenham | 2025 |
| Aill Trust Corporation Limited | Doncaster | 2021 |
| Ailsa Craig Limited | Girvan | 2020 |
| Ailsa Developments Limited | Bamber Bridge Preston | 1974 |
| AIM and Hope Limited | Edgware | 2026 |
| AIM High 10 Limited | Carluke | 2026 |
| AIM High Properties Ltd | Chalfont St. Giles | 2023 |
| Aim-Point Air Rifles & Accessories (Cumbria) Ltd | Cockermouth | 2016 |
| Aimbry International Limited | Huddersfield | 1979 |
| Aime Cafe Ltd | Leicester | 2024 |
| Aimedia Associates Ltd | Islington | 2010 |
| Aimee Malika Hall Ltd | South Shields | 2021 |
| Aimes Advisory Ltd | Sevenoaks | 2024 |
| Aiminterior Limited | London | 2021 |
| Aiml Consultancy Ltd | London | 2025 |
| Aimos Group Limited | High Wycombe | 2023 |
| Aims Business Advisory Group Ltd | London | 2014 |
| Aims Developments Ltd | London | 2015 |
| Aimsales Mahamed Limited | Cardiff | 2025 |
| Aimtru Brands Limited | Brierley Hill | 2022 |
| Aine Niamh Butler Ltd | High Wycombe | 2025 |
| Aine O'Callaghan Therapy Services Limited | Esher | 2021 |
| Ainkaf Limited | Smethwick | 2017 |
| Ainopa Limited | Ashton-Under-Lyne | 2013 |
| Ainsco Fire & Security Limited | Liverpool | 2019 |
| Ainscough Structures & Steel Processing Limited | Skelmersdale | 2014 |
| Ainscough Wind Energy Services Limited | Wigan | 2010 |
| Ainsdale Distribution Ltd | Salford | 2014 |
| Ainsworth Fitzgerald Limited | Harrogate | 2026 |
| Ainsworth Holdings Limited | Maidstone | 2007 |
| Ainsworth Insulation Limited | Sheffield | 1999 |
| Ainsworth Insulation Supplies Limited | Sheffield | 2003 |
| Ainsworth Nominees 2 Ltd | Salford | 2019 |
| Ainsworth Nominees Ltd | Salford | 2017 |
| Aintree Racecourse Company Limited | Liverpool | 1982 |
| Aintree Road 1979 Limited | Crawley | 2015 |
| Aintree Storage Limited | Liverpool | 2024 |
| Aiolos Yachting Ltd | London | 2021 |
| AIP Limited | Sutton Coldfield | 2007 |
| Aipcf V Goss Limited | London | 2015 |
| Aipcf V Optimas Limited | London | 2015 |
| Aipos Maritime Ltd | London | 2016 |