| Amtis Holdings Ltd | Birmingham | 2022 |
| Amtivo Finco Limited | West Malling | 2018 |
| Amtivo Midco Limited | West Malling | 2018 |
| Amtivo Services Limited | West Malling | 2021 |
| Amtivo Topco Limited | West Malling | 2018 |
| Amtm Limited | Birmingham | 2016 |
| Amto Assets Ltd | London | 2025 |
| Amto Consulting Ltd | Kington | 2015 |
| Amtrust Corporate Member Two Limited | London | 2004 |
| Amtrust Specialty Limited | London | 1975 |
| Amtzt Ltd | London | 2024 |
| Amul Holdings Limited | Birmingham | 2026 |
| Amulet Mortgages Ltd | Folkestone | 2018 |
| Amulet Private Office Limited | Grantham | 2016 |
| Amulet Specialty Limited | London | 2025 |
| Amundi (UK) Limited | London | 1983 |
| Amundi Trident Holding Ltd | London | 2025 |
| Amunet Holdings Ltd | London | 2024 |
| Amuno Investments Limited | Bournemouth | 2013 |
| Amurrani Ltd | West Malling | 2025 |
| AMUST4MUSIC Holdings Limited | Derby | 2017 |
| AMV BP Ltd | London | 2025 |
| AMV Services Holdings Limited | Bridgend | 2020 |
| Amvale Holdings Limited | Scunthorpe | 2015 |
| Amvale Properties Ltd | London | 2025 |
| Amvida Investments Ltd | Skegness | 2016 |
| AMW Finance Limited | Warrington | 2006 |
| AMW Investmens Ltd | London | 2023 |
| AMW Investments Limited | Stoke-On-Trent | 2021 |
| Amwaj Capital Group Ltd | London | 2025 |
| Amwaj Gold Holdings Ltd | London | 2025 |
| Amwell Holdings Limited | Romford | 2022 |
| Amwins Global Risks Limited | London | 1968 |
| Amworth Investment Management UK Limited | London | 2021 |
| Amxtec Limited | London | 2025 |
| AMY Edwards Limited | Eastleigh | 2025 |
| AMY Ellen Ltd | Aylesbury | 2022 |
| AMY Hope-Smith Limited | Ashbourne | 2016 |
| AMY Pugh True Potential Ltd | Tenby | 2025 |
| AMY Revill Ltd | Bedford | 2025 |
| AMY Russell Holdings Ltd | Weston-Super-Mare | 2023 |
| AMY Stubbs Next Generation Investments Ltd | Louth | 2024 |
| AMY Waeland Mortgage Services Limited | Lytham St. Annes | 2014 |
| AMY West Holdings Ltd | London | 2024 |
| Amyes Investments (Holdings) Limited | London | 2019 |
| Amygdala Ltd | London | 2024 |
| Amyla Limited | Harrow | 2019 |
| Amyna Ltd. | London | 2019 |
| Amyor Limited | Chester | 2025 |
| AMZ Consultant Group Ltd | Batley | 2026 |
| AMZ Mush Limited | London | 2021 |
| AMZ Wealth Management Ltd | Oldham | 2026 |
| Amza Corporation Limited | Derby | 1994 |
| Amzam Holdco Limited | Dunstable | 2024 |
| Amzdoge Financial Services Limited | Cardiff | 2022 |
| AN Ciste Infheistiochta Gaeilge | Derry. | 2010 |
| AN Commercial Holdings Ltd | London | 2025 |
| AN Englishman's Castle Limited | St. Albans | 2016 |
| AN Financial Consultancy Limited | Bradford | 2015 |
| AN Group Holdings Ltd | London | 2025 |
| AN Idea Lives on Ltd | London | 2014 |
| AN Independent Mortgage Solution Ltd | Belfast | 2012 |
| AN International Ventures Ltd | Manchester | 2022 |
| AN Invisible Hand Limited | Fordingbridge | 2024 |
| AN Life - Holding Ltd | Tonbridge | 2026 |
| AN Lightside Holdings Ltd | Banbury | 2022 |
| AN Nasihah Holdings Limited | Leicester | 2019 |
| AN Post (NI) Limited | Belfast | 1991 |
| AN Products Limited | Birmingham | 2025 |
| AN Sealladh Holdings Limited | Hamilton | 2025 |
| ANA Capital Investment Limited | Birmingham | 2023 |
| ANA Investments Limited | East Sussex | 2002 |
| Anaa Holdings Ltd | Peterborough | 2025 |
| Anabaa Limited | Southend-On-Sea | 2011 |
| Anabasis Holdings Limited | London | 2021 |
| Anaber Investments Ltd | Great Chesterford | 2024 |
| Anabeya Capital Limited | London | 2023 |
| Anabeya Limited | London | 2023 |
| Anaco Holdings Limited | London | 2026 |
| Anacot Holding Limited | London | 2022 |
| Anacott Holdings Ltd | London | 2017 |
| Anacott Steel Limited | London | 2014 |
| Anacta Strategies UK Limited | London | 2023 |
| Anaderol Ltd | Luton | 2024 |
| Anaedas Limited | Ormskirk | 2019 |
| Anaga Holdings Limited | Kensington | 2017 |
| Anaheim Funding Limited | London | 2022 |
| Anaho Limited | Birmingham | 2024 |
| Anaiymar Ltd | London | 2024 |
| Anakar Holdings Limited | St. Albans | 2020 |
| Anakieva Capital and Equity Ltd | Guildford | 2025 |
| Anaktos Limited | London | 2026 |
| Analog Robot Holding Ltd | Watford | 2026 |
| Analogue & Micro Holdings Limited | Newport | 2016 |
| Analogue Insight IP Group Limited | London | 2025 |
| Analox Holdings Limited | Royston | 2022 |
| Analuma Ltd | Cobham | 2016 |
| Analyse Action Impact (AAI) Consultancy Limited | Fareham | 2017 |
| Analysis Trustees Limited | Leeds | 1985 |
| Analyst Alpha Generation Limited | London | 2021 |