| Aberdeenshire Birth and Baby CIC | Inverurie | 2025 |
| Aberdeenshire Clinical Psychology Ltd | Inverurie | 2020 |
| Aberdeenshire Homecare Services Ltd | Aberdeen | 2024 |
| Aberdeenshire Voluntary Action | Aberdeen | 1992 |
| Aberdonia Care Limited | Aberdeen | 2019 |
| Aberdour Medical Limited | Ashbourne | 2016 |
| Aberdour Psychology and Psychotherapy Services Limited | Burntisland | 2011 |
| Abereinga Company Ltd | Canvey Island | 2018 |
| Aberfeldy Community Care Ltd | Musselburgh | 2020 |
| Aberfoyle Childcare Services Limited | Dundee | 2022 |
| Abergarw Care Home Limited | Pontprennau | 2021 |
| Abergavenny Care Home Limited | London | 2017 |
| Abergavenny Dental Laboratories Limited | Pontypool | 2010 |
| Abergavenny Hand Surgery Limited | Swansea | 2017 |
| Abergele EYE Care Limited | Bury St. Edmunds | 2025 |
| Aberhealth Ltd | Llanelli | 2025 |
| Aberlyn Consulting Ltd | Glasgow | 2024 |
| Aberness Care Limited | Aberdeen | 2012 |
| ABERRY237 Ltd | Liverpool | 2025 |
| Abersoch Dental Care Limited | Pwllheli | 2010 |
| Abertawe Chiropractic Clinic Ltd | Swansea | 2022 |
| Abertawe Residential Care Ltd | Swansea | 2019 |
| Abertawe Systemic Therapy / Swansea Family Therapy Limited | Swansea | 2022 |
| Abertillery DC Ltd | Pontypridd | 2024 |
| Abervision Limited | Aberdeen | 2024 |
| Aberystwyth and District Hospice at Home Volunteers | Aberystwyth | 2014 |
| Abesco Daycare Limited | London | 2022 |
| Abesthetic Ltd | Leatherhead | 2016 |
| Abetter Health Ltd | Newport | 2021 |
| Abetteryu Limited | Chorley | 2018 |
| Abex and Associates Ltd | Stevenage | 2022 |
| Abex Psychology Services Limited | Maidstone | 2025 |
| Abeyrin Total Wellness Ltd | Dunstable | 2023 |
| Abeysekera Ltd | Manchester | 2025 |
| Abff Healthcare Limited | Milton Keynes | 2017 |
| Abfiyas Care Ltd | Grangemouth | 2013 |
| ABG Synergix Ltd | Stockport | 2019 |
| Abgawood Medical Ltd | Stockton-On-Tees | 2023 |
| Abglaucoma Ltd | London | 2022 |
| Abgndiaye Ltd | Cardiff | 2019 |
| ABH Partners Limited | London | 2025 |
| ABH Surgery Limited | Waterlooville | 2023 |
| Abhaile Insight Ltd | Chatham | 2024 |
| Abhi Care Ltd | South Croydon | 2013 |
| Abhi Rose Homecare Ltd | Dewsbury | 2016 |
| Abhijeet Saxena Limited | Cambridge | 2019 |
| Abhiramam Limited | Blackburn | 2022 |
| Abhiroh Limited | Bournemouth | 2022 |
| Abhirush Limited | Ashby-De-La-Zouch | 2012 |
| Abhishis Limited | Leicester | 2025 |
| Abhispecs Ltd | Lancashire | 2025 |
| Abhivrudhi Healthcare Limited | Lancaster | 2019 |
| Abhneryst Ltd | Edinburgh | 2023 |
| Abholly (2008) Limited | Plymouth | 2008 |
| Abhyant Healthcare Ltd | Stanmore | 2024 |
| ABI & Ambrose Limited | England | 2006 |
| ABI Balance Ltd | Epsom | 2025 |
| ABI Billinghurst & Associates | London | 2014 |
| ABI BMS Limited | London | 2025 |
| ABI Care Agency Limited | Urmston. Manchester | 2015 |
| ABI Care Limited | London | 2019 |
| ABI Case Management Ltd | Wigan | 2018 |
| ABI Dental Care Limited | London | 2021 |
| ABI Developments 1 Ltd | London | 2008 |
| ABI Developments 2 Ltd | London | 2008 |
| ABI Developments 3 Limited | London | 2008 |
| ABI Fernandez Elevated Health and Healing Ltd | Whitland | 2025 |
| ABI Glory Limited | Leigh | 2026 |
| ABI Health UK Limited | London | 2024 |
| ABI Mills Limited | Leigh-On-Sea | 2025 |
| ABI Peters Aesthetics Ltd | Waterlooville | 2025 |
| ABI Smile Clinic Ltd | London | 2026 |
| ABI Therapy Space Limited | London | 2025 |
| Abi's Care Solutions Ltd | Manchester | 2021 |
| Abi's Childcare Limited | London | 2019 |
| Abi's Kids Ltd | London | 2024 |
| Abi's Medical Services Ltd | Harlow | 2023 |
| Abi-Support Ltd | Didcot | 2020 |
| ABI4GS Limited | London | 2021 |
| Abiaf Ltd | Uxbridge | 2023 |
| Abiagu Ltd | Woodford Green | 2025 |
| Abiam Consultancy Limited | Grays | 2013 |
| Abib Health Care Services Ltd | Edinburgh | 2021 |
| Abicap Healthcare Ltd | West Bromwich | 2013 |
| Abicare 71 Limited | Milton Keynes | 2014 |
| Abiceleste Care Ltd | Birmingham | 2021 |
| Abichem Care Ltd | London | 2023 |
| Abid & Zeenath Ltd | Stoke-On-Trent | 2023 |
| Abid Dental Ltd | Willenhall | 2025 |
| Abid Javed Limited | Accrington | 2012 |
| Abid Master Optics Ltd | London | 2020 |
| Abid Medical Ltd | Birmingham | 2023 |
| Abid Trust UK Ltd | Blackburn | 2025 |
| Abid Welfare Limited | Birmingham | 2007 |
| ABID94 Ltd | Luton | 2024 |
| Abidam Limited | Harlow | 2023 |
| Abidan Resource Limited | Erith | 2015 |
| Abidco Ltd | Middlesbrough | 2018 |
| Abide by Majestic Cedar Ltd | Tunbridge Wells | 2025 |
| Abide Home Care Limited | Brixham | 2016 |