| A Kennedy-Ballard Consulting Ltd | Swindon | 2025 |
| A L Smythe TM Ltd | Doncaster | 2025 |
| A M Strategy Solutions Ltd | London | 2026 |
| A One Social Work Services Limited | Rugby | 2023 |
| A Plus Health Ltd | Shefford | 2023 |
| A R D Sharpe Ltd | Wiltshire | 2013 |
| A Smythe Tsco Services Ltd | Gainsborough | 2024 |
| A Step Ahead CIC | London | 2025 |
| A Strategy Art Consulting Ltd. | London | 2018 |
| A Sweeter Place Ltd | Birmingham | 2025 |
| A Tapp Health Ltd | New Malden | 2023 |
| A to B Training Ltd | Wolverhampton | 2025 |
| A Virtual Assistant Ltd | Leatherhead | 2021 |
| A Westcott TM Ltd | Doncaster | 2023 |
| A&B Home Care Ltd | Middlesbrough | 2020 |
| A&C Home Care Ltd | Stoke-On-Trent | 2019 |
| A&C Sprinkler Ltd | Romford | 2024 |
| A&E Fire and Security (Holdings) Limited | Cheltenham | 2019 |
| A&J Global Ventures Ltd | Truro | 2023 |
| A&M Physio Limited | Bradford | 2023 |
| A&O Trading Limited | Luton | 2013 |
| A&W Care Ltd | Leicester | 2023 |
| A-Z Safety Ltd | Cardiff | 2022 |
| A. C. Counselling Limited | Chester | 2000 |
| A. Govservices Limited | Bristol | 2021 |
| A. Older Safety Solutions Ltd | Warwick | 2019 |
| A.C.Tm Ltd | Doncaster | 2024 |
| A.Chand Clinical Ltd | Birmingham | 2026 |
| A.F.P. Fire Protection Limited | Derbyshire | 2003 |
| A.Finnegan Ltd | Buckley | 2015 |
| A.J Clark Ltd | Sunderland | 2026 |
| A.L.L.I Collective Limited | Bromley | 2026 |
| A.N Optical Services Ltd | Huddersfield | 2023 |
| A.R.F.F. Vehicle Support Limited | Barnstaple | 2006 |
| A.S. Therapy Space Ltd | Ilford | 2023 |
| A.Z Specialist Ltd | London | 2019 |
| A1 Extinguishers Ltd | Southend-On-Sea | 2019 |
| A1 Fire Ltd | Rochdale | 2018 |
| A1 Fire Protection Engineers Limited | Glasgow | 2007 |
| A1 Traffic Safety Limited | Preston | 2017 |
| A2Z Home Care Services Limited | Watford | 2020 |
| A2Z of FM Group Limited | Blaydon-On-Tyne | 2022 |
| A360 Ltd | Portsmouth | 2018 |
| A6UFE Limited | Barking | 2022 |
| AA & LA Limited | Wirral | 2021 |
| AA Care Consortium Ltd | London | 2026 |
| AA Endeavours Limited | Accrington | 2019 |
| AA Online Services Limited | Blackburn | 2024 |
| AA Standard Healthcare Services Ltd | Horley | 2024 |
| AAA Estates & Associate Limited | Erith | 2023 |
| AAA25 Ltd | Bradford | 2025 |
| Aaaz Medical Limited | Maidstone | 2026 |
| Aadr (London) Ltd | London | 2025 |
| Aafirex Ltd | London | 2024 |
| Aakansha Sharma Counselling Ltd | London | 2022 |
| Aalmi Majlis Tahaffuz Khatm E Nubuwwat UK CIC | Middlesbrough | 2025 |
| Aaron Adams TM Ltd | Doncaster | 2022 |
| Aaron Yusuf Ltd | Hove | 2020 |
| Aasia's Care Limited | London | 2023 |
| AAT Global Ltd | Wolverhampton | 2024 |
| AB Premier CIC | Huyton | 2025 |
| AB Sprinklers Limited | Newtown | 2017 |
| Abbaflo Ltd | London | 2025 |
| Abbey Fire Extinguishers Ltd | Lymington | 2024 |
| Abbey Fire Systems Ltd | Peterborough | 2025 |
| Abbeyabs Limited | Ashford | 2025 |
| Abbonz Limited | Oldham | 2022 |
| Abbot Health Care Ltd | Hayes | 2026 |
| Abbott Group Ltd | Stalybridge | 2024 |
| Abby Gjames Ltd | Bristol | 2023 |
| Abby Health Care Services Ltd | London | 2022 |
| ABC Fire Solutions Limited | Chesterfield | 2009 |
| ABC Health Clinic Limited | Crawley | 2024 |
| ABC Health Solution Limited | Bracknell | 2022 |
| Abchem Solutions Ltd | Cheadle | 2018 |
| Abclivein Care Limited | Farnham | 2018 |
| Abcorp College of Investigation and Intelligence Ltd | London | 2025 |
| Abdel Healthcare Ltd | Leicester | 2026 |
| Abema Healthcare Limited | Milton Keynes | 2023 |
| Abennett Co. Ltd | Wickford | 2019 |
| Aberdeen Aqua Ltd | Glasgow | 2025 |
| Abergower Caribbean Limited | London | 2024 |
| Abfirex Ltd | Larbert | 2025 |
| Abibad Limited | London | 2023 |
| Abidammy Limited | Bromley | 2022 |
| Abide Healthcare Ltd | Norwich | 2024 |
| Ability Home Care Ltd | Paisley | 2025 |
| Abilondon Limited | London | 2024 |
| Abobvo Links Ltd | Luton | 2021 |
| Abondia Limited | London | 2013 |
| Abounding Support & Care Ltd | Bordon | 2019 |
| About That Security Ltd | Peterborough | 2025 |
| Aboutcare Hastings Ltd | St. Leonards-On-Sea | 2017 |
| Above the Noise Ltd | Liverpool | 2021 |
| Absolute Care at Home (EM) Limited | Ratby | 2019 |
| Absolute Golden Living Ltd | Dagenham | 2024 |
| Absolute Health Fire Safety Limited | Liversedge | 2018 |
| Absolute Security Ltd | London | 2021 |
| Absolute Training & Development Ltd | Slough | 2023 |
| ABT Fire Ltd | Ormskirk | 2019 |