| Alsewan Associates Limited | Brentwood | 2014 |
| Alsha Homes Limited | Rotherham | 2024 |
| Alshadida Medical Services Limited | Huddersfield | 2020 |
| Alshahed Limited | Stockport | 2022 |
| Alshanti Health Ltd | Blackburn | 2024 |
| Alshanti Ltd | Altrincham | 2020 |
| Alshather Consultants Ltd | Harrow | 2016 |
| Alshifa Direct Limited | Sheffield | 2014 |
| Alshifa Solutions Limited | Preston | 2023 |
| Alshurbasi Ltd | Sheffield | 2024 |
| Alsidra Group Ltd | Sunderland | 2024 |
| Alsj & Co Limited | York | 2023 |
| Alson Ltd. | London | 2016 |
| Alsondesiree Ltd | Sidcup | 2014 |
| Alssan Support Services Ltd | London | 2022 |
| Alsters Limited | Thornton Heath | 2020 |
| Alston (MCR) Ltd | Manchester | 2017 |
| Alston Dental Practice Limited | Brampton | 2015 |
| Alston Lodge Community Care Limited | Longridge | 2017 |
| Alston Medical Limited | Wilmslow | 2025 |
| Alston Pharmacy Limited | Alston | 2010 |
| Alston View Nursing Home Ltd | Worksop | 2000 |
| Alstonefield Ltd | Derby | 2023 |
| Alstrom Syndrome Europe | Torquay | 2014 |
| Alstrom Syndrome UK | Torquay | 1998 |
| Alsun Ltd | Stoke-On-Trent | 2022 |
| Alsweedan Ltd | London | 2013 |
| ALT Wellness Group Ltd | Cardiff | 2025 |
| Alt-Na-Craig Limited | Greenock | 2009 |
| Alta Casa Care Ltd | Harrow | 2024 |
| Alta Medica Limited | Coventry | 2024 |
| Altaa Pete Limited | Ilford | 2024 |
| Altaaj Limited | Wrexham | 2025 |
| Altabaldi Ltd | London | 2025 |
| Altabeb Ltd | Liverpool | 2024 |
| Altach Limited | Nottingham | 2024 |
| Altaf Pharm Ltd | Bradford | 2024 |
| Altaf Smiles Limited | Leeds | 2014 |
| Altair Healthcare Limited | Okehampton | 2021 |
| Altair Medical Limited | Edinburgh | 2021 |
| Altair Partners Limited | Borehamwood | 2021 |
| Altakaful | London | 2026 |
| Altamira Training Academy | London | 2018 |
| Altanova Ltd | Shipley | 2026 |
| Altar EGO Ltd | Nottingham | 2023 |
| Altar of Earth CIC | Glasgow | 2025 |
| Altarra Healing Limited | Billingham | 2023 |
| Altascreening Limited | London | 2025 |
| Altash Healthcare Limited | Shipley | 2013 |
| Altay Services Ltd | Letchworth Garden City | 2024 |
| Altayeb Dermatology Consultant Ltd | London | 2025 |
| Altcare Associate Ltd | Newton Aycliffe | 2022 |
| Altcare Ltd | Bristol | 2024 |
| Altea Clinical Ltd | Cardiff | 2025 |
| Altemano Ltd | London | 2019 |
| Alter EGO Beauty Clinic Ltd | West Bromwich | 2014 |
| Alterbiome Limited | Birmingham | 2025 |
| Altered Images (Swansea) Limited | Swansea | 2012 |
| Altered Images Physiotherapy Limited | Droitwich | 2003 |
| Altereon Ltd | Oxford | 2026 |
| Alterergo Limited | Luton | 2020 |
| Alterna Healthcare Limited | Welling | 2005 |
| Alternate Limited | London | 2024 |
| Alternate Nutrition Limited | London | 2024 |
| Alternate Relief Limited | Batley | 2024 |
| Alternative Action Group Community Interest Company | Leicester | 2024 |
| Alternative Approach Family Support Ltd | Ellesmere Port | 2024 |
| Alternative Approach Group Ltd | Bury | 2025 |
| Alternative Camhs Ltd | West Bridgford | 2019 |
| Alternative Care Limited | Wakefield | 2000 |
| Alternative Coaching Limited | Chesham | 2016 |
| Alternative Futures Group Limited | Liverpool | 1992 |
| Alternative Healthcare Ltd | Liverpool | 2023 |
| Alternative Housing Services WM Limited | Birmingham | 2018 |
| Alternative Means Limited | Chichester | 2000 |
| Alternative Medicine Incorporated Limited | Bedford | 2013 |
| Alternative Options Care Limited | Dartford | 2023 |
| Alternative Pleasures (Entertainments) Ltd | Lowestoft | 2025 |
| Alternative Smart Solutions Ltd | Redhill | 2018 |
| Alternative Therapies Ltd | Wirral | 2025 |
| Alternative Treatment Services Ltd | London | 2016 |
| Alternative Voices Theatre Company CIC | Leicester | 2025 |
| Alternative Wellbeing and Spa Ltd | Ilford | 2025 |
| Alternatives 4 Children UK (A4C UK) Ltd | London | 2020 |
| Alternatives to Violence Project, Britain | London | 2000 |
| Alternatives Watford | Hemel Hempstead | 2002 |
| Alternatives West Dunbartonshire CDS | Dumbarton | 2003 |
| Altha Global Treatment Ltd | London | 2020 |
| Altham Care Limited | Accrington | 2001 |
| Althea Aesthetics Ltd | Brough | 2025 |
| Althea Anaesthesia Limited | Bath | 2025 |
| Althea Care Ltd | London | 2026 |
| Althea Direct Cares Ltd | Leicester | 2025 |
| Althea Healthcare (Holdings) Limited | Lowestoft | 2010 |
| Althea Healthcare (Management) Limited | Lowestoft | 2011 |
| Althea Healthcare Investments Limited | Lowestoft | 2008 |
| Althea Healthcare Limited | Lowestoft | 2007 |
| Althea Healthcare Properties Limited | Lowestoft | 2007 |
| Althea Investments Ltd | Lowestoft | 2011 |
| Althea Private Limited | Slough | 2025 |