| Amerenth UK Limited | London Sw11 3Ad | 2013 |
| Ameretat Solutions Ltd | London | 2026 |
| Amerge Ltd | Altrincham | 2019 |
| Amergin Ltd | Llantwit Major | 2017 |
| Amerial Limited | London | 2005 |
| Ameriamk Ltd | Lancashire | 2019 |
| America International Trade Limited | London | 2018 |
| America Limited | London | 1987 |
| American ACC. ASS. - AAA Ltd | Birmingham | 2021 |
| American Business & Development Agency Ltd | London | 2004 |
| American CAN (UK) Limited | Luton | 1909 |
| American CAN Holdings (U.K.) Limited | Luton | 1968 |
| American Credit Capital Ltd | Glasgow | 2021 |
| American Database Services Limited | Derbyshire | 2007 |
| American Dining Franchise Ltd | Birmingham | 2020 |
| American European Advisors (UK) Limited | Glasgow | 2018 |
| American Express UK Pension Plan Trustees Limited | London | 2022 |
| American Fizz Holdings Limited | Christchurch | 2016 |
| American Golf Holidays Limited | Eastleigh | 2002 |
| American Holidays Limited | Harrow | 2025 |
| American PIE Holdings Ltd | Billericay | 2002 |
| American Renovations Ltd | London | 2022 |
| American Sky Limited | Richmond | 2006 |
| American Sports Boats Ltd | Bristol | 2007 |
| American Tax Consulting UK Ltd | Potters Bar | 2021 |
| American Tax Returns Ltd | London | 2012 |
| American Tax UK Ltd | London | 2005 |
| American Trade House UK Limited | London | 2023 |
| American Trilogy Limited | Ulverston | 2023 |
| American UK Tax Solutions Ltd | London | 2017 |
| Americana Communications Ltd | Knutsford | 2024 |
| Americana Film Ltd | Paisley | 2026 |
| Americas Limited | Watford | 1996 |
| Americhem Holdings International Limited | London | 1994 |
| Americo Projects LDA Limited | Whyteleafe | 2010 |
| Americold Chile Holdings UK Limited | Lurgan | 2024 |
| Americold Holdings UK Limited | Lurgan | 2015 |
| Amero Financial Research Limited | London | 2024 |
| Ameroba Business Solutions & Consulting Ltd | Glasgow | 2025 |
| Amerrall Limited | Fleet | 1998 |
| Amersfort Limited | Potten End | 2002 |
| Amersham 10 Renewables Limited | Northampton | 2023 |
| Amersham Accountancy Limited | Amersham | 2013 |
| Amersham Pharmacovigilance Services Limited | Whitehills Business Park | 2012 |
| Amersham Project Management Limited | London | 2010 |
| Amersham Studios Limited | Grimsby | 2014 |
| Amersham Technologies Ltd | Cockermouth | 1998 |
| Amersify Limited | Stoughton | 2021 |
| Amerston Consulting Ltd | Guisborough | 2013 |
| Amertamia | Wigan | 2025 |
| Amertat Consulting Limited | London | 2022 |
| Amertek Scientific Ltd | Aldershot | 2019 |
| Amertive Ltd | Poole | 2021 |
| Amerton Engineering Limited | Stafford | 2019 |
| Amerton Holdco Limited | Berkhamsted | 2013 |
| Amery Investments Limited | London | 2008 |
| Ameryst Services Limited | Warrington | 2021 |
| Ames Brisley Accounting Ltd | Surrey | 2016 |
| Ames Consultancy Limited | West Wickham | 1995 |
| Ames Consulting Ltd | Carnforth | 2021 |
| Ames UK Holdings Ltd. | Pollington | 2017 |
| Amesbury Consulting Ltd | New Malden | 2025 |
| Amesbury Fleur Limited | Cambridge | 1997 |
| Amesbury Ltd | London | 2022 |
| Amesbury VETS4PETS Limited | Handforth | 2014 |
| Amescape Limited | London | 1994 |
| Amese C.I.C. | Birmingham | 2024 |
| Amesgain Limited | | 1990 |
| Amesmo Ltd | London | 2018 |
| Amesos Limited | Chertsey | 2013 |
| Amessential Photography Limited | Tipton | 2025 |
| Amesto Payroll Services (UK) Ltd | Oxford | 2025 |
| Amet Accountants Ltd | Croydon | 2020 |
| Ametalco Limited | Sheffield | 1963 |
| Ametek Aerospace and Defense Group UK Limited | Leicester | 2012 |
| Ametek European Holdings Limited | Leicester | 2010 |
| Ametek Global Limited | Leicester | 2022 |
| Ametek Instruments Group UK Limited | Leicester | 2012 |
| Ametek International Limited | Leicester | 2022 |
| Ametek UK Finance Limited | Leicester | 2021 |
| Amethi Vets Ltd | Stockport | 2023 |
| Amethist Consulting Limited | Cowes | 2011 |
| Amethyst Accounting Ltd | Stevenage | 2015 |
| Amethyst Accounting Services Limited | Southend-On-Sea | 2007 |
| Amethyst Accounting Solutions Ltd | Stevenage | 2015 |
| Amethyst BOW Limited | High Peak | 2018 |
| Amethyst Business Consulting Ltd | Doncaster | 2025 |
| Amethyst Career Consultancy Ltd | London | 2026 |
| Amethyst Consultancy Services Limited | Bretton | 2026 |
| Amethyst Design Studio Ltd | Portsmouth | 2021 |
| Amethyst Ecology Ltd | Cowes | 2024 |
| Amethyst Engineering Limited | Ashford | 2016 |
| Amethyst Financial Limited | Ware | 2005 |
| Amethyst Global Advisory Limited | Poole | 2023 |
| Amethyst Global Ltd | West Kilbride | 2020 |
| Amethyst Group Services Limited | Kessingland | 2013 |
| Amethyst HR Solutions Limited | London | 2024 |
| Amethyst International Limited | London | 2025 |
| Amethyst IT Solutions Ltd | Bury St. Edmunds | 2023 |
| Amethyst Landscapes Ltd | Haslemere | 2024 |