| Amber Residential Care Homes Ltd | Winchester | 2000 |
| Amber RG Medical Limited | Glossop | 2022 |
| Amber Rose Healthcare Ltd | Taunton | 2022 |
| Amber Rose Ltd | Frodsham | 2022 |
| Amber Rose Psychotherapies Ltd | Bishop'S Stortford | 2021 |
| Amber Shade Limited | Manchester | 2017 |
| Amber Supported Housing C.I.C. | Birmingham | 2018 |
| Amber Tree Health Ltd | Orpington | 2025 |
| Amber Valley Association for Mental Health Ltd | Ilkeston | 1997 |
| Amber Valley Health Ltd | Heanor | 2018 |
| Amber Valley Podiatry Ltd | Alfreton | 2026 |
| Amber Valley Practice Limited | Alfreton | 2022 |
| Amber Valley Riders | Nottingham | 2000 |
| Amber Valley Total Care Ltd | Leicester | 2013 |
| Amber Wellness Limited | London | 2023 |
| Amber-Green Consultants Limited | Burton Upon Trent | 2021 |
| Amberbrook Limited | Birmingham | 1991 |
| Ambercloud Limited | Cardiff | 2006 |
| Amberden Care Limited | London | 2025 |
| Ambere Health Care Limited | West Bromwich | 2014 |
| Amberfertility Ltd | Berkhamsted | 2024 |
| Amberfit Workplace Ltd | Dungannon | 2026 |
| Ambergreen Health & Social Care Ltd | Luton | 2013 |
| Amberin FUR and Associates Limited | Sidcup | 2015 |
| Amberley Aesthetics Limited | Wotton-Under-Edge | 2025 |
| Amberley Care Home Limited | Slough | 2018 |
| Amberley Care Limited | Southampton | 2013 |
| Amberley Children’S Services Limited | Chatham | 2025 |
| Amberley Healthcare Limited | Cheltenham | 1995 |
| Amberley Lodge Care Home Limited | Watford | 2006 |
| Amberline Care Ltd | Cardiff | 2016 |
| Ambermeds Solutions Ltd | Crawley | 2023 |
| Amberoak Limited | Cardiff | 2010 |
| Amberrosa Limited | Southampton | 2024 |
| Amberwood Care Home Limited | Leicester | 2005 |
| Amberyan Services Ltd | Luton | 2016 |
| Amberzin Global Services Ltd | Milton Keynes | 2022 |
| Ambi Healthcare Limited | Burnley | 2025 |
| Ambi Medics Ltd | Sutton | 2023 |
| AMBI1ST Ltd | Arlesey | 2023 |
| Ambia Aesthetics Ltd | Borehamwood | 2019 |
| Ambian (UK) Limited | Newcastle Upon Tyne | 2003 |
| Ambiance & Solace Therapies Ltd | Hitchin | 2010 |
| Ambiance Care Limited | Stockport | 2020 |
| Ambiance Locums Ltd | Heckmondwike | 2021 |
| Ambicare Limited | Kirkcudbright | 2018 |
| Ambicorp Ltd | Newark | 2010 |
| Ambidex Limited | Cheadle | 2014 |
| Ambience Healthcare Ltd | Bramley | 2012 |
| Ambient Care Limited | Seaton | 2019 |
| Ambient Cove Limited | Glasgow | 2025 |
| Ambient Healthcare Services Ltd | Dagenham | 2023 |
| Ambient Psychology Ltd | Bury | 2025 |
| Ambient Support Limited | Salisbury | 2010 |
| Ambika Medicare Ltd | Milton Keynes | 2023 |
| Ambika Yoga Ltd. | London | 2015 |
| Ambikan Ltd | London | 2022 |
| Ambimind Limited | Manchester | 2020 |
| Ambio Patient Care Services Ltd | Bristol | 2025 |
| Ambion Healthcare Ltd | Littlehampton | 2025 |
| Ambioo Limited | London | 2024 |
| Ambition Community Healthcare Ltd | Dereham | 2018 |
| Ambition Health and Performance Clinics Ltd | | 1998 |
| Ambition Health Group Ltd | Mildenhall | 2026 |
| Ambition Healthcare Ltd | Newtownards | 2019 |
| Ambition Homes Limited | Dudley | 2026 |
| Ambition Lawrence Weston | Bristol | 2012 |
| Ambition Links Limited | St Leonards On Sea | 2017 |
| Ambitions First Care Ltd | Nottingham | 2025 |
| Ambitions Support Ltd | Exeter | 2014 |
| Ambitious Care Leicester Limited | Thurmaston | 2021 |
| Ambitious Children's Homes Essex Ltd | Barking | 2024 |
| Ambitious Children's Homes Ltd | Barking | 2022 |
| Ambitious Supported Living Ltd | Doncaster | 2021 |
| Ambitious Training Centre Ltd | London | 2011 |
| Amble Health Ltd. | London | 2025 |
| Amble UK Ltd | King'S Lynn | 2022 |
| Amble Youth Project Ltd | Morpeth | 2008 |
| Ambler Podiatry Limited | Paisley | 2009 |
| Amblers Endoscopy Ltd | Chesterfield | 2024 |
| Amblers Ltd | Braunton | 2010 |
| Ambleside (Beechwood Care) Limited | Milton Keynes | 2025 |
| Ambleside (Complex Care ) Limited | Milton Keynes | 2025 |
| Ambleside Opticians Ltd | Ambleside | 2010 |
| Ambleside Parish Centre | Ambleside | 2011 |
| AMBO4SERVICES Limited | Nottingham | 2018 |
| Ambocare Ltd | Hull | 2022 |
| Amboseli 2 Limited | Dagenham | 2023 |
| Ambosho Ltd | London | 2019 |
| Ambreen & Sarmad Limited | Mildenhall | 2017 |
| Ambreen RAD Co Ltd | Carshalton | 2025 |
| Ambrella Healthcare Service Ltd | Reading | 2026 |
| Ambresbury Care Limited | Loughton | 2020 |
| Ambridge Estates Limited | Yeovil | 2007 |
| Ambrogio Ltd | London | 2020 |
| Ambroise Therapies Limited | Bicester | 2025 |
| Ambrose Caring Services Limited | Anerley | 2014 |
| Ambrose Crest Limited | Sunderland | 2026 |
| Ambrose Medical Services Limited | Bentworth | 2020 |
| Ambrosia Care Ltd | Alderley Edge | 2025 |