| Amek Investments (Central London) Limited | London | 2014 |
| Amel Joint Ventures Ltd | Cardiff | 2022 |
| Amel Properties and Investments Limited | London | 2022 |
| Amel Trading Ltd | Esher | 2021 |
| Amel Wealth Ltd | Lancing | 2025 |
| Amelanchier Investments Limited | Towcester | 2017 |
| Amelec EOT Ltd | Towcester | 2025 |
| Amelex Markets Limited | London | 2026 |
| Amelia & Isla Ltd | Milton Keynes | 2024 |
| Amelia (GB) Ltd | London | 2010 |
| Amelia Jasmin Ltd | Middlesbrough | 2023 |
| Amelia Rose Limited | Huddersfield | 2019 |
| Amelia Sordell Investments Ltd | London | 2025 |
| Ameliam Consultancy Limited | Leyland | 2022 |
| Amelie Equity Ltd | Ruislip, | 2025 |
| Amelio Investments Limited | Lincoln | 2024 |
| Amelion Ltd | London | 2025 |
| Ameliora Financial Ltd | Hexham | 2022 |
| Ameliorate Investment Company | Guildford | 2025 |
| Amelliam Limited | Wantage | 2025 |
| Amellis Enterprises Ltd | Darlington | 2022 |
| Amelo Holdings Limited | St. Albans | 2023 |
| Amelo Ventures Ltd | London | 2026 |
| Amelto Capital Limited | London | 2012 |
| Ameltra Group Ltd | Ashford | 2026 |
| Amelulu Holdings Limited | London | 2024 |
| Amensons Ltd | London | 2019 |
| Amentit Ltd | London | 2025 |
| Ameon Group Limited | Blackpool | 2005 |
| Ameon Holdings Limited | Blackpool | 2015 |
| Ameon Utilities (Group) Limited | Blackpool | 2021 |
| Ameon Utilities (Holdings) Limited | Blackpool | 2014 |
| Ameon Utilities Group (2024) Limited | Blackpool | 2024 |
| Amephie Holdings Limited | Bury | 2025 |
| Amer 18 Financial Limited | Whitley Bay | 2017 |
| Amer Capital Holdings Ltd | London | 2026 |
| Amerc Holdings Ltd | Northampton | 2026 |
| Amercian Quant Investment Ltd | Beckenham | 2022 |
| Amerco Holdings Ltd | Glasgow | 2025 |
| Amerdale Limited | Blackburn | 2002 |
| America's Growth Capital Limited | London | 2004 |
| American Dining Group Ltd | Birmingham | 2020 |
| American Express Holdings Limited | London | 2004 |
| American International Group UK Limited | London | 2017 |
| American Port Services Holdings Limited | London | 2000 |
| American Standard (U.K.) Co. | Hull | 1977 |
| American Tax Returns Holdings Ltd | Slough | 2024 |
| Americover Limited | Colchester | 2013 |
| Amerit Fleet Solutions UK, Ltd | London | 2025 |
| Ameritas Ltd | London | 2023 |
| Ameritz Properties Limited | Warrington | 2026 |
| Amerlan Limited | Bracknell | 2018 |
| Ameroc ERW Ltd | Bristol | 2023 |
| Amersham (Holdings) Ltd. | Ipswich | 1932 |
| Amersham Insurance Services Limited | London | 2014 |
| Amersham Investment Management Ltd | London | 2009 |
| Amersham Technology Limited | Pinner | 2007 |
| Amersham WG Holdings Ltd | Chesham | 2024 |
| Amery Capital Limited | London | 2004 |
| Ames Property Holdings Limited | Neston | 2021 |
| Amester Ltd | Chelmsford | 2011 |
| Amesworks Limited | Norwich | 2026 |
| Amet Group Holdings Ltd | Belfast | 2019 |
| Amet Holdings Ltd | Peterborough | 2025 |
| Amet Insurance Solutions Limited | Belfast | 2016 |
| Ametek Crystal Power Limited | Leicester | 2025 |
| Amethyst Capital Holdings Limited | Warrington | 2023 |
| Amethyst Capital Limited | London | 2025 |
| Amethyst Financial Planning Limited | Preston | 2002 |
| Amethyst Group Holdings Ltd | Huddersfield | 2023 |
| Amethyst Holdings Ltd | Stevenage | 2026 |
| Amethyst Insurance Brokers Limited | Leicester | 2023 |
| Amethyst JL Ltd | Belfast | 2021 |
| Amethyst Mortgage Services Ltd | Burnham-On-Sea | 2015 |
| Amethyst Property Solutions Limited | Poole | 2017 |
| Amethyst Wealth Limited | Nottingham | 2026 |
| Ameuri Limited | Ilkley | 2012 |
| Amey Belfast Schools Partnership Hold Co Limited | Manchester | 2008 |
| Amey Defence Equipment (Assets) Holdings Limited | London | 2021 |
| Amey Defence Equipment (Assets) Limited | London | 2021 |
| Amey Defence Equipment (Services) Holdings Limited | London | 2020 |
| Amey Finance Services Limited | London | 2015 |
| Amey FMP Belfast Strategic Partnership Hold Co Limited | Manchester | 2008 |
| Amey Hallam Highways Holdings Limited | Manchester | 2012 |
| Amey Holdings Limited | London | 2005 |
| Amey Infrastructure Management (1) Limited | Leeds | 2017 |
| Amey Infrastructure Management (3) Limited | Manchester | 2018 |
| Amey Investing Company Ltd | Faringdon | 2021 |
| Amey Lighting (Norfolk) Holdings Limited | Manchester | 2007 |
| Amey OW Group Limited | London | 1996 |
| Amey Rail Holdings Limited | London | 2025 |
| Amey Roads NI Holdings Limited | Belfast | 2007 |
| Amey Ventures Asset Holdings Limited | London | 2009 |
| Amey Ventures Investments Limited | Manchester | 2003 |
| Amey Ventures Limited | London | 2001 |
| AMF Holdings (MK) Ltd | Milton Keynes | 2025 |
| AMF Investment Holdings Limited | Liverpool | 2025 |
| AMF Mortgage Solutions Ltd | Barnsley | 2023 |
| AMF NI Holdings Unlimited | Belfast | 2024 |
| AMF Vault Ltd | Woodbridge | 2024 |