| Ampcs Limited | Catcliffe, Rotherham | 2007 |
| Ampdean Ltd | Egham | 2011 |
| Amped Associates Limited | Sutton | 2016 |
| Amped AV Ltd | St. Albans | 2019 |
| Amped Consultancy Ltd | Warrington | 2018 |
| Amped Creative Ltd | Basildon | 2022 |
| Amped Latinum Limited | Aberdeen | 2023 |
| Amped PCR Ltd | Aberystwyth | 2022 |
| Amped UP Energy Limited | Manchester | 2025 |
| Ampedus Arboricultural Consultancy Limited | Lewes | 2024 |
| Ampem Management Limited | London | 2021 |
| Amper&And Ltd | Manchester | 2026 |
| Ampera Ltd | Rochdale | 2013 |
| Ampere Consulting Limited | London | 2021 |
| Ampere Holdings Ltd | London | 2019 |
| Ampere Technologies Ltd | Wembley | 2025 |
| Ampere-San Events Ltd | Edinburgh | 2024 |
| Amperetech Process Automation and Engineering Ltd | London | 2025 |
| Amperia Partners Ltd | Birmingham | 2025 |
| Amperneo Limited | Nottingham | 2019 |
| Amperor (Europe) Limited | Leeds | 1996 |
| Ampersand 8 Limited | Carnforth | 2016 |
| Ampersand Advisory Limited | Bristol | 2019 |
| Ampersand Associates Limited | Bishop'S Stortford | 1990 |
| Ampersand Brands Limited | Harrogate | 2011 |
| Ampersand Cabinetry Ltd. | London | 2015 |
| Ampersand Co Studio Ltd | Leeds | 2023 |
| Ampersand Commercial Marketing Ltd | Nottingham | 2025 |
| Ampersand Consulting Ltd | Harrogate | 2024 |
| Ampersand Copy Ltd | Livingston | 2023 |
| Ampersand Design Group Limited | London | 2024 |
| Ampersand Group Ltd | Plymouth | 2022 |
| Ampersand Health Limited | London | 2018 |
| Ampersand Holdings Limited | Wymondham | 2025 |
| Ampersand Interiors Limited | Edinburgh | 2016 |
| Ampersand Law Ltd | London | 2019 |
| Ampersand Marketing Limited | London | 2025 |
| Ampersand Medical Communications Limited | Preston | 2017 |
| Ampersand Philanthropy Limited | Guildford | 2025 |
| Ampersand Structural Design Ltd | Westhill | 2023 |
| Ampersand UK Limited | Ludlow | 1999 |
| Ampersand Ventures Limited | London | 2024 |
| Ampersandesign Ltd | Kidlington | 2023 |
| Ampersans Design Limited | London | 2016 |
| Ampersat 15 Limited | Stourbridge | 2013 |
| Ampert Ltd | Skegness | 2015 |
| Amperthyst Ltd | London | 2025 |
| Ampervolt Analytics Ltd | Swindon | 2026 |
| Amperxander Ltd | Burntisland | 2023 |
| Ampex Ltd | Glasgow | 2025 |
| Ampezzo Consulting Limited | London | 2017 |
| Ampfield Golf Management Limited | Stockbridge | 2001 |
| Ampfield Management Consulting Limited | Romsey | 2014 |
| Ampfield Traffic Consultants Ltd | Eastleigh | 2011 |
| Ampg Surveying Services Ltd | Hull | 2026 |
| Amph Consulting Limited | Evesham | 2019 |
| Ampharma Solutions Limited | Nottingham | 2017 |
| Amphenol Commercial and Industrial UK, Limited | Kent | 1997 |
| Amphenol Holding UK, Limited | Kent | 1997 |
| Amphenol-Borg Limited | Kent | 1957 |
| Amphenol-Borg Pension Trustees Limited | Kent | 1977 |
| Amphibian Designs Limited | London | 2009 |
| Amphibian Productions Limited | London | 2005 |
| Amphibio Ltd | London | 2018 |
| Amphibion Limited | Chelmsford | 2022 |
| Amphiform UK Ltd | Oxford | 2026 |
| Amphin Ltd | London | 2024 |
| Amphion Lloyd Limited | London | 2019 |
| Amphion Pro Ltd | London | 2023 |
| Amphiris Limited | Lichfield | 2026 |
| Amphista Therapeutics Limited | Cambridge | 2017 |
| Amphitrite (South) Limited | Southampton | 2021 |
| Amphitrite Limited | Chelmsford | 2020 |
| Amphitype Ltd | London | 2018 |
| Amphix Limited | London | 2013 |
| Amphletts Solicitors Limited | Conwy | 2010 |
| Amphora Commercial Holdings Ltd | Colchester | 2017 |
| Amphora NDT Ltd | Lisburn | 2020 |
| Amphora Solutions Ltd | Bracknell | 2014 |
| Amphos Energy Ltd | Ripley | 2025 |
| Amphos Ltd | Derby | 2024 |
| Amphoteric Analytical Limited | Eastleigh | 2014 |
| Ampi Limited | Wrotham Heath | 2008 |
| Ampika Limited | Royston | 2003 |
| Ampion Biomedical Ltd | Leicester | 2023 |
| Ampion Limited | Belfast | 2011 |
| Ampiper Limited | Leicester | 2015 |
| Ampira Energy Limited | Manchester | 2024 |
| Ampito Capital Limited | Hove | 2018 |
| Ampj Consulting Limited | Chippenham | 2018 |
| Ampkine Limited | Cambridge | 2019 |
| Ampl Design Ltd | Newtownabbey | 2021 |
| Ampla Consulting Limited | Derby | 2015 |
| Ample Consulting Ltd | Maidenhead | 2024 |
| Ample Exchange (Ampl-Ex) Engineering Solutions Ltd | Croydon | 2019 |
| Ample Fashions Ltd | Batley | 2024 |
| Ample Fordian Services Ltd | Aylesbury | 2015 |
| Ample Inc Ltd | Birmingham | 2025 |
| Ample Marketing Ltd | London | 2021 |
| Ample Proteins Limited | London | 2025 |