| Ambitor Limited | London | 2020 |
| Ambitos Health Ltd | London | 2026 |
| Ambiverse Films Ltd | Bristol | 2015 |
| Ambiwave Limited | Hertfordshire | 1998 |
| Ambixer Ltd | London | 2025 |
| Ambixor Limited | London | 2025 |
| Ambixos Ltd | London | 2025 |
| Ambjack Consultancy Ltd | Camberley | 2025 |
| Ambl Group Limited | Southend On Sea | 2021 |
| Ambl Limited | Southend On Sea | 2022 |
| Amblebridge Solutions Ltd | Stourbridge | 2015 |
| Ambleside Corner Limited | Newtownards | 2022 |
| Ambleside Life Ltd | Oxford | 2026 |
| Ambleside Publishing Ltd | Bury St. Edmunds | 2025 |
| Amblewood Limited | Corsham | 2005 |
| Ambna Limited | Leeds | 2017 |
| Ambos AI Limited | Cardiff | 2025 |
| Ambos Digital Limited | Liverpool | 2012 |
| Ambos Studios Ltd | Aylesford | 2023 |
| Ambouli Ltd | Lytham | 2011 |
| Ambr Technologies Limited | London | 2022 |
| Ambraisoft Ltd. | London | 2025 |
| Ambraplus Ltd | Bristol | 2025 |
| Ambridge Business Services Ltd | Glasgow | 2014 |
| Ambrit Consulting Limited | Amersham | 2013 |
| Ambrit Limited | Dunstable | 1984 |
| Ambrite IT Limited | Hinckley | 2014 |
| Ambrium Ltd | Ashford | 2017 |
| Ambroforia Ltd | London | 2025 |
| Ambrogio Coletti Ltd | Bristol | 2023 |
| Ambron Solutions Limited | Claremount | 2010 |
| Ambrose & Bailey Limited | Lancing | 2006 |
| Ambrose Business Associates Limited | Tonbridge | 2019 |
| Ambrose Code & Security Academy Ltd | Henlow | 2026 |
| Ambrose Technologies Ltd | Eastleigh | 2019 |
| Ambrosia City Ltd | London | 2019 |
| Ambrosia Design Limited | Stevenage | 2012 |
| Ambrosia Records Ltd | Haverhill | 2020 |
| Ambrosolutions Limited | Carshalton | 2013 |
| Ambrotech Ltd | Gloucester | 2025 |
| Ambrotypista Ltd | London | 2021 |
| Ambrr Ambrr Ltd | London | 2025 |
| Ambrron Ltd | Twyford | 2013 |
| Ambt Limited | London | 2006 |
| Ambue Ltd | Thame | 2020 |
| Ambulance Intelligence Limited | Borehamwood | 2026 |
| Ambulant Solutions Ltd | Kingsbridge | 2025 |
| Ambulante Limited | Edinburgh | 2016 |
| Ambur Community Radio Limited | Walsall | 2008 |
| Ambur Limited | Watford | 2024 |
| Ambush Entertainment Ltd | Surbiton | 2011 |
| Ambush Productions Ltd | Penzance | 2019 |
| Ambush Reality Records Limited | York | 2022 |
| Ambx Limited | Newcastle Upon Tyne | 2008 |
| Amby Digital Ltd | Northampton | 2020 |
| Ambzdt Entertainment Limited | York | 2018 |
| AMC Channel Poland Limited | London | 2007 |
| AMC Channels Limited | London | 2026 |
| AMC Comms Ltd | Tamworth | 2019 |
| AMC Data Ltd | Newark | 2025 |
| AMC Datasens Ltd | London | 2022 |
| AMC ERP Ltd | Blackpool | 2017 |
| AMC Europe Ltd | Market Drayton | 2022 |
| AMC Fitness Limited | Cheltenham | 1997 |
| AMC Global Media UK Partner Limited | London | 2007 |
| AMC Media and Design Limited | Oxford | 2010 |
| AMC Media Production Ltd | London | 2025 |
| AMC Networks International Broadcasting Limited | London | 1999 |
| AMC Networks International Enterprises Limited | London | 1997 |
| AMC Networks International Zone Holdings Limited | London | 2013 |
| AMC Pharma 24 Ltd | London | 2009 |
| AMC Pictures Limited | Pontefract | 2005 |
| AMC Project Solutions Ltd | Cardiff | 2015 |
| AMC Scenic Ltd | St Albans | 2016 |
| AMC Software Ltd | Leeds | 2019 |
| AMC Strategies Ltd | London | 2024 |
| AMC Studios UK Ltd | London | 2019 |
| AMC Telecommunications Ltd | Liverpool | 2023 |
| AMC Telecoms Limited | Pontypridd | 2011 |
| AMC Theatres of UK Limited | London | 1996 |
| AMC UK Topco Limited | London | 2014 |
| Amc-It Consultants and Services Ltd | London | 2024 |
| Amc-It Services Limited | Northampton | 2024 |
| Amc-It Solutions Limited | Northampton | 2005 |
| Amca Productions Limited | Leigh-On-Sea | 2019 |
| AMCA88 Limited | Glasgow | 2023 |
| Amcada Consulting Limited | Aylesbury | 2023 |
| Amcal Geospatial Limited | Horsham | 2013 |
| Amcal Limited | Poole | 2015 |
| Amcall Communications Limited | Eastleigh | 1998 |
| Amcam TV Ltd | Rugby | 2010 |
| Amcan Limited | London | 2025 |
| Amcas Corporation Ltd | Woodbridge | 2006 |
| Amcb Ltd | London | 2024 |
| Amcc Group Ltd | London | 2025 |
| Amccormick IT Ltd | Cardross | 2015 |
| Amcel Limited | Luton | 2007 |
| Amcgservices Ltd | Corby | 2024 |
| Amch Limited | London | 2024 |
| Amch Services Ltd | Plymouth | 2017 |