| Afsheen Noreen Limited | Healdgreen | 2024 |
| AFT Consultancy Limited | Caerphilly | 2024 |
| AFT Consulting Ltd | London | 2018 |
| AFT Elite Construction Ltd | Cardiff | 2025 |
| AFT Engineering Ltd | Rotherham | 2019 |
| AFT Global UK Ltd | London | 2010 |
| Afta Electrical Limited | Upminster | 2015 |
| Aftab Enterprises Limited | Manchester | 2022 |
| Aftabakhib Limited | London | 2025 |
| Aftec Electrical Services Limited | Cannock | 2001 |
| Aftec Ltd | London | 2015 |
| Aftell Building Contractors Ltd | Glasgow | 2023 |
| After 5 Cleaning Ltd | Bromley | 2011 |
| After 5 Property Services Ltd | Bromley | 2016 |
| After Aqua Limited | Wigton | 2010 |
| After Build Limited | Burgess Hill | 2003 |
| After Dark Ltd | Derby | 2025 |
| After Hours Decorating Limited | Reading | 2025 |
| AFTER5SERVICES Ltd | London | 2018 |
| Afterbuild Care Limited | Exeter | 2026 |
| Aftercare Double Glazing Repairs Ltd | Burgess Hill | 2003 |
| Aftercare Holdings Limited | Barnsley | 2023 |
| Aftercare Home Improvements Ltd | Enfield | 2025 |
| Afterclad Ltd | Worcester | 2021 |
| Aftercrete Constructional Engineering Co. Limited | Luton | 1963 |
| Afterdark Creative Ltd | Nuneaton | 2021 |
| Afterglow Electrical Limited | Brentwood | 2022 |
| Afterglow Heating Limited | Southampton | 2017 |
| Afterglow Property Maintenance Services Ltd | Belfast | 2023 |
| Afterhourstudio Forward Limited | London | 2019 |
| Aftermath Decorators Limited | Dagenham | 2023 |
| Afterway Developments Limited | St. Ives | 2011 |
| Aftex Ltd | Bury St. Edmunds | 2015 |
| Aftk Electrical Consultants Ltd | Swindon | 2024 |
| Afton Builders Limited | Cumnock | 2023 |
| Afton Plumbing Limited | Troon | 2015 |
| Afton Valley Joiners Ltd | Ayr | 2025 |
| AFU Construction Ltd | London | 2025 |
| AFU Design & Bulid Ltd | Ilford | 2024 |
| AFU Stoves Ltd | Knutsford | 2022 |
| Afuaki Ltd | London | 2024 |
| Afur Alarms Ltd | Glasgow | 2023 |
| Afusion Finance Ltd | Egham | 2025 |
| Afvm Maintenance Limited | Kingston Upon Thames | 2019 |
| AFW Construction Ltd | Ruthin | 2021 |
| AFX Ventilation Ltd | Crewe | 2024 |
| AFZ Electrical Services Ltd | Oxford | 2021 |
| Afzal Building Services Ltd | London | 2023 |
| Afzali Limited | London | 2017 |
| AG & DH Developments Limited | Louth | 2022 |
| AG & JG Electrical Limited | Durham | 2017 |
| AG & M Construction Ltd | Barnet | 2021 |
| AG & NJ Solutions Limited | Manchester | 2019 |
| AG 87 Ltd | Harrow | 2023 |
| AG Acquisitions Limited | London | 2003 |
| AG Adcock Electrical Services Limited | Stamford | 2021 |
| AG AGU Construction Limited | Bridgwater | 2017 |
| AG Allbright Electrical Company Ltd | West Wickham | 2015 |
| AG Anderson Building & Landscaping Ltd | Chester Le Street | 2017 |
| AG Bespoke Brickwork Ltd | Bromsgrove | 2021 |
| AG Bespoke Solutions Ltd | London | 2015 |
| AG Best Fire Protection Ltd | Gravesend | 2014 |
| AG Blackwell Limited | Basildon | 2012 |
| AG Brickwork NW Ltd | Wigan | 2026 |
| AG Builder (Scotland) Limited | Carluke | 2024 |
| AG Builders and Plumbers Limited | London | 2002 |
| AG Building & Fencing Ltd | Derby | 2014 |
| AG Building & Plastering Limited | St Austell | 2018 |
| AG Building and Maintenance Limited | Bexleyheath | 2021 |
| AG Building Ltd | Chesterfield | 2021 |
| AG Builds Ltd | Grays | 2025 |
| AG Cable Jointing Limited | Watford | 2015 |
| AG Cadzow Limited | Glasgow | 2002 |
| AG Cambrook Developments Ltd | Barking | 2025 |
| AG Capital Solutions Ltd | London | 2026 |
| AG Carpentry Services Ltd | Croydon | 2021 |
| AG Carpet & Flooring Limited | Croydon | 2014 |
| AG Ceilings (Lincs) Limited | Lincoln | 2008 |
| AG Civils (March) Ltd | March | 2022 |
| AG Civils Limited | Newark | 2011 |
| AG Climate Services Ltd | Hull | 2017 |
| AG Climatics Ltd | Exeter | 2019 |
| AG Commercial Investment Ltd | Leicester | 2019 |
| AG Construct Limited | Dagenham | 2020 |
| AG Construction & Developments Ltd | York | 2018 |
| AG Construction & Refurbishment Ltd | Wembley | 2023 |
| AG Construction (Hilton) Ltd | Birmingham | 2018 |
| AG Construction (NW) Limited | Blackburn | 2022 |
| AG Construction (NW1) Ltd | Blackburn | 2022 |
| AG Construction (UK) Ltd | Lincoln | 2003 |
| AG Construction Projects Limited | Manchester | 2016 |
| AG Constructions LON Ltd | Birmingham | 2025 |
| AG Consult Ltd | Huddersfield | 2005 |
| AG Consultancy & Facade Management Limited | St. Albans | 2018 |
| AG Consultants QS Ltd | Dartford | 2025 |
| AG Contractors (London) Limited | Barnet | 2019 |
| AG Contracts Ltd | Basildon | 2024 |
| AG Conversions Limited | Worthing | 2021 |
| AG Cordero Limited | Shrewsbury | 2016 |
| AG Decor Cote D'Azur Ltd | London | 2023 |