| Aimmune Nestle Health Science UK R&D Limited | York | 2021 |
| Aimocs Limited | London | 2024 |
| Aimon Consultancy Limited | London | 2013 |
| Aimpact Consulting Ltd | Ely | 2025 |
| Aimpact LAB Ltd | London | 2025 |
| Aimpact Ltd | Bury St. Edmunds | 2024 |
| Aimr Limited | Elstree, Borehamwood | 2010 |
| Aimre Consulting Limited | Aberdeen | 2012 |
| Aimron CSE Ltd | Basingstoke | 2025 |
| Aims & Co Ltd | London | 2013 |
| Aims 432ONE Ltd | Edenbridge | 2026 |
| Aims Achieved Ltd | Farnham | 2019 |
| Aims Advisory Ltd | Slough | 2024 |
| Aims Associates Limited | Tilbury | 2021 |
| Aims Automotive Solutions Ltd | Rugby | 2021 |
| Aims Business Consultants Ltd | Slough | 2025 |
| Aims Capital Ltd | London | 2015 |
| Aims Care Group Limited | London | 2017 |
| Aims Communication Services Ltd | London | 2020 |
| Aims Consultancy Limited | Enfield | 2011 |
| Aims Consultancy Services Ltd | Romford | 2024 |
| Aims Consulting Ltd | Watford | 2010 |
| Aims Finance Services Ltd | London | 2025 |
| Aims for Industry Limited | Priory Park,St. Neots | 1991 |
| Aims FX Limited | London | 2023 |
| Aims Global Group Ltd | Worthing | 2026 |
| Aims Global Intellectual Property Services UK Ltd | Manchester | 2022 |
| Aims International UK Limited | London | 1990 |
| Aims of Industry Limited | | 2001 |
| Aims Private Limited | Sutton Coldfield | 2019 |
| Aims Software Solutions Ltd | Basildon | 2005 |
| Aims Solutions UK Limited | Rickmansworth | 2024 |
| Aims Surveys Limited | Chesterfield | 2023 |
| Aimsak UK Ltd | London | 2024 |
| Aimserv Limited | St. Neots | 2025 |
| Aimspraxis Ltd | Colchester | 2025 |
| Aimstar Limited | Richmond | 2024 |
| Aimstar Support Ltd | Mold | 2024 |
| Aimsurv Ltd | Wigan | 2018 |
| Aimtarn Limited | Edgware | 1977 |
| Aimtech International Ltd | Edinburgh | 2021 |
| Aimtech Solutions Limited | Pudsey | 2014 |
| Aimtracer Ltd | Ashton-Under-Lyne | 2005 |
| Aimwise Limited | Windsor | 2002 |
| Aimylos Consulting Ltd | Winchester | 2023 |
| Aimz Group Ltd | Coventry | 2026 |
| AIN Care Ltd | Cannock | 2019 |
| AIN Design and Publications Limited | London | 2022 |
| AIN FS Ltd | Salford | 2025 |
| AIN Media Ltd | Ruislip, | 2026 |
| Aina Consultancy Limited | Stockport | 2011 |
| Aina Financial Services Limited | Hull | 2018 |
| Aina Khan Law Limited | London | 2018 |
| Ainaa Ltd | London | 2023 |
| Ainc Management Ltd | Edgware | 2020 |
| Aindah Consultancy Ltd | Rochester | 2023 |
| Aindtservices Ltd | Rotherham | 2024 |
| Aindustrial Ltd | Chesterfield | 2020 |
| Aine Glackin Architecture & Interiors Limited | Belfast | 2022 |
| Aine Limited | London | 2019 |
| Ainesorcha Limited | Belfast | 2019 |
| Ainge Consulting Ltd | Swadlincote | 2019 |
| Aingel Limited | London | 2023 |
| Ainger Investments Limited | Doncaster | 2014 |
| Ainges Asset Holdings Limited | Lichfield | 2013 |
| Ainhurst Limited | Bournemouth | 1967 |
| Ainigma Universe UK Ltd | Saltash | 2024 |
| Ainiseflow Limited | Mildenhall | 2026 |
| Ainj Group Ltd | Kettering | 2026 |
| Ainleys Accountants Limited | Liverpool | 2020 |
| Ainleys Accountants(Wales) Limited | Liverpool | 2013 |
| Ainleys Employment Services Ltd | Liverpool | 2025 |
| Aino Audio Ltd | Didcot | 2018 |
| Ainoa Brands Ltd | Newcastle Upon Tyne | 2022 |
| Ainsbrook Consultancy Ltd | Shaftesbury | 2011 |
| Ainsco Ventures Ltd | Liverpool | 2026 |
| Ainscough Consultancy Ltd | Lowestoft | 2011 |
| Ainscough Consulting Ltd | London | 2026 |
| Ainscough Farm Company | Berwick-Upon-Tweed | 1998 |
| Ainscough Industrial Services Limited | Wigan | 2013 |
| Ainscough Investments Limited | Wigan | 2007 |
| Ainsdale Building Consultancy Limited | Liverpool | 2019 |
| Ainsfield PLC | Tewin | 2012 |
| Ainsight City Ltd | London | 2023 |
| Ainsley Business Services Limited | Wedmore | 2015 |
| Ainsley Gill Dispute Resolution Limited | Canterbury | 2021 |
| Ainsley Gommon Architects Limited | Merseyside | 2001 |
| Ainsley Gommon Trustee Limited | Birkenhead | 2023 |
| Ainsley Harris Ltd | High Wycombe | 2010 |
| Ainsley Motor Werks Ltd | Whitley Bay | 2024 |
| Ainsley Smith & Co Limited | Oban | 2012 |
| Ainsleys Touch Ltd | London | 2026 |
| Ainslie Advisory Limited | London | 2023 |
| Ainslie Brands Ltd | Glasgow | 2020 |
| Ainslie Capital Limited | Castle Combe | 2012 |
| Ainslie Gray Ltd | Droxford | 2022 |
| Ainsojameso Image Disection, Inc. Ltd | Manchester | 2018 |
| Ainsty Development Consulting Limited | York | 2018 |
| Ainsty Nominees Limited | York | 1962 |
| Ainsty Risk Consulting Limited | York | 2010 |