| Asbestos Cleaning UK Ltd | Carnforth | 2026 |
| Asbestos Clearance and Disposal Services Limited | Stockport | 1984 |
| Asbestos Contracting Limited | Poole | 2012 |
| Asbestos Control and Treatment Limited | Liverpool | 1999 |
| Asbestos Disposal Solutions Ltd | Penryn | 2020 |
| Asbestos Environmental Limited | Antrim | 2018 |
| Asbestos Essentials Limited | Aspley Guise | 2017 |
| Asbestos Experts Ltd | London | 2025 |
| Asbestos First Ltd | London | 1988 |
| Asbestos KCB Ltd | Westcliff-On-Sea | 2026 |
| Asbestos Management Company (Ireland) Limited | Coleraine | 2005 |
| Asbestos Northwest Consultants Ltd | Liverpool | 2016 |
| Asbestos Norwich Limited | Norwich | 2024 |
| Asbestos Removal and Collections Ltd | Sheerness | 2021 |
| Asbestos Removal Contractors Limited | London | 2022 |
| Asbestos Removal Environmental Ltd | Glasgow | 2026 |
| Asbestos Removal Ltd | Chessington | 2024 |
| Asbestos Removal Near ME Ltd | Birmingham | 2025 |
| Asbestos Removal Team Ltd | Stockport | 2022 |
| Asbestos Solutions Ltd | Epping | 2014 |
| Asbestos Solutions Southwest Limited | Exeter | 2018 |
| Asbestos Somerset Ltd | Street | 2021 |
| Asbestos to Go (Services) Ltd | Kidderminster | 2014 |
| Asbestos Transfer Services Ltd | London | 2014 |
| Asbestos Waste Solutions Limited | Orpington | 2013 |
| Asbestos Yorkshire Limited | Birstall | 2019 |
| ASC Contractors Ltd | Sheffield | 2018 |
| ASC Contracts Ltd | Sheffield | 2009 |
| ASC Water and Energy Limited | London | 2023 |
| Ascot Drainage & Tanker Services Ltd | London | 2025 |
| Ascot Vehicle Breakers Ltd | Derby | 2016 |
| ASE General Cleaning Ltd Company Limited | Leeds | 2015 |
| Asenby Quarry Limited | North Yorkshire | 2008 |
| Asgb Limited | Inverkeithing | 2016 |
| Asgen Limited | Chelmsford | 1999 |
| ASH Aggregates Limited | Oswestry | 2017 |
| ASH Group (UK) Limited | Oswestry | 2016 |
| ASH Heat and Power Limited | Oswestry | 2016 |
| ASH Installations and Construction Ltd | Cardiff | 2018 |
| ASH Land Companies Limited | Oswestry | 2018 |
| ASH Metal Recycling Limited | Oswestry | 2005 |
| ASH Nelson Limited | Suffolk | 2003 |
| ASH Remediation Management Limited | Kingswinford | 2009 |
| ASH Resource Management (Cambrian Quarry) Limited | Oswestry | 2009 |
| ASH Waste Services Limited | Oswestry | 2007 |
| Ashards Ventilation Hygiene Services Ltd | Welham Green | 2024 |
| Ashbee Solutions Ltd | Colchester | 2018 |
| Ashby Clearance and Recycling Limited | Sidcup | 2021 |
| Ashcourt Recycling Limited | Pocklington | 2023 |
| Asher Britain Consortium Limited | London | 2014 |
| Ashfield Japanese Knotweed Limited | Cardiff | 2015 |
| Ashford (Scrap) Metals Limited | Ashford | 2008 |
| Ashley Plant Hire and Reclamation Limited | Altrincham | 2002 |
| Ashreed P.L.C. | Epsom | 1989 |
| Ashton Mill Services Limited | Melksham | 2005 |
| Ashton's Composting Limited | North Humberside | 2007 |
| Ashure Waste Group Ltd | Potters Bar | 2025 |
| Ashwaste Environmental Limited | Chelmsford | 2003 |
| Ashwell Metals Limited | Norwich | 2007 |
| Ashwells Reclaimed Timber Ltd | Billericay | 2018 |
| ASK4SKIPS Limited | Porthcawl | 2019 |
| ASM Metal Recycling Ltd. | Beaconsfield | 1967 |
| ASM Serv Ltd | London | 2019 |
| ASP Environmental Limited | Haverhill | 2018 |
| Aspcold Limited | Leeds | 2023 |
| Aspect Contracts Limited | Basildon | 2007 |
| Aspect Drainage Solutions Ltd | Prescot | 2024 |
| Aspek Global Solutions Limited | Glasgow | 2026 |
| Asphalt Northwest Ltd | Heywood | 2019 |
| Aspira Group Ltd | Derby | 2025 |
| Aspire Network Services Ltd | London | 2020 |
| Aspire Property Services (Dorset & Hampshire) Ltd | New Milton | 2017 |
| Asps Recycling Limited | Cannock | 2000 |
| Asquith Renew Ltd | Stanmore | 2007 |
| Asset Lifecycle Solutions (North) Limited | Runcorn | 2022 |
| Asset Lifecycle Solutions Limited | Runcorn | 2022 |
| Asset Precision Ltd | Sutton-In-Ashfield | 2016 |
| Assist India | Milton Keynes | 2021 |
| Associated Aluminium Sales Limited | Westcliffe-On-Sea | 1985 |
| Associated Waste Management Limited | Leeds | 2000 |
| Assure Property Claims & Solutions Ltd | Newtownards | 2025 |
| Assured Air and Water Limited | Bromsgrove | 2012 |
| Assured Contracting Services Ltd | Gloucester | 2023 |
| Assured International Limited | Kidwelly | 2023 |
| Assured Water Ltd | Alcester | 2014 |
| Asta Solutions Limited | Chepstow | 2010 |
| Astar Waste Limited | Birmingham | 2013 |
| Astley House Limited | Manchester | 2022 |
| Aston Tank Services Limited | Nantwich | 2025 |
| Astra Recycling Limited | Waterlooville | 2013 |
| Asuk Removals Ltd | Glenrothes | 2025 |
| AT Environmental Services Ltd | Coleraine | 2012 |
| AT Special Projects Ltd | Lutterworth | 2020 |
| AT Your Convenience UK Limited | Ickenham | 2005 |
| Atacamite Clearances Ltd | Sheffield | 2025 |
| Atana Ltd | London | 2001 |
| Atantooil Waste Ltd | Nelson | 2025 |
| ATC Limited | London | 2025 |
| Atec Drainage Systems Limited | Caerphilly | 2008 |
| Ates Pest Control Limited | London | 2008 |