| Atex Integrity Ltd | Glasgow | 2020 |
| ATF Drainage Ltd | Melton Mowbray | 2024 |
| ATG Environmental Services (NI) Limited | Coleraine | 2012 |
| ATG Services (Ireland) Ltd | Coleraine | 2007 |
| Athanis International Ltd | Cranbrook | 2024 |
| Atherley Recycling Limited | Southampton | 2015 |
| Athys Waste Ltd | W.Sussex | 2024 |
| Atkins Waste Division Ltd | Romford | 2026 |
| Atkinson Skip Hire Limited | Pelaw, Gateshead | 2006 |
| Atlantic Ecopark Limited | Cardiff | 2006 |
| Atlantic Infrastructure Ltd | London | 2024 |
| Atlantic Power Limited | Cardiff | 2006 |
| Atlantic Recycling Limited | Cardiff | 2006 |
| Atlantic Waste Management Limited | Cardiff | 2006 |
| Atlantichse Ltd | Ilford | 2026 |
| Atlantico Recycling Ltd | London | 2023 |
| Atlas Asbestos Ltd | Liverpool | 2025 |
| Atlas Drainage and Groundwork Solutions Ltd | Liverpool | 2024 |
| Atlas Environmental Limited | Bedford | 2009 |
| Atlas Holiday Homes Limited | Liverpool | 1973 |
| Atlas Industrial Services Limited | York | 2002 |
| Atlas OIL Ltd | Enfield | 2025 |
| Atlas Plumbing & Drainage Co Ltd | Barking | 2016 |
| Atlas Prime Ltd | Bolton | 2024 |
| Atlas Refrigerated Vehicles Limited | | 1970 |
| Atlas Skip & Grab Hire Ltd | Bedford | 2013 |
| Atlas Waste Ltd | Basildon | 2020 |
| Atlas Waste Solutions Ltd | Basildon | 2025 |
| ATM Skip Hire Ltd | Cannock | 2019 |
| Atmospheric Water Enterprises Ltd | London | 2026 |
| Atom Risk Solutions Ltd | Colchester | 2026 |
| Atom Water Treatment Ltd | Colchester | 2016 |
| Atonement Enterprise Community Interest Company | London | 2007 |
| Atrada Ltd | Sheffield | 2021 |
| ATS (Service) Ltd | Heathfield | 2002 |
| ATS Mini Skips Limited | Watford | 2015 |
| Atsco Ltd | London | 2026 |
| ATT Build Ltd | Welling | 2026 |
| Attainis Ltd | Offenham | 2024 |
| Attero Projects Limited | Nottingham | 2017 |
| Attgills Limited | Rushden | 2019 |
| ATW BIN Hire Ltd | Seaford | 2022 |
| ATW Recycling Ltd | Seaford | 2025 |
| ATY Automotive & Industrial Components (UK) Limited | Warwick | 1990 |
| Aubritex Limited | Bournemouth | 2020 |
| Auction Afrique UK Ltd | West Bromwich | 2018 |
| Audenshaws (Oldbury) Limited | Dudley | 2010 |
| Audosta Ltd | Newport | 2009 |
| Augean North Limited | Wetherby | 1998 |
| Augean North Sea Services Limited | Aberdeen | 2012 |
| Augean South Limited | Wetherby | 2003 |
| Augean Treatment Limited | West Yorkshire | 2000 |
| Auger Site Investigations Limited | Liverpool | 1995 |
| Aughrim Landfill Limited | Craigavon | 2005 |
| Aughton Utilities Ltd | Oldham | 2023 |
| Aura Waste Management Ltd | London | 2022 |
| Auragen Waste Management Ltd | Belvedere | 2014 |
| Aureon Water Technologies Limited | Ashford | 2026 |
| Auric Global Ltd | Bournemouth | 2019 |
| Aurum Drainage Limited | Loughton | 2026 |
| Aussie Metal Management Ltd | Plymouth | 2012 |
| Austin Roberts Limited | Moreton | 1976 |
| Auto Bits Scrap Metal Limited | Willenhall | 2008 |
| Auto Body Collections Ltd | Salford | 2024 |
| Auto E Recovery Ltd | Rochdale | 2025 |
| Auto Loader Ltd | Sherborne | 2025 |
| Auto Plas Bumper Recycling Ltd | St. Helens | 2022 |
| Auto Plas Recycling Limited | Ossett | 2009 |
| Auto Scrap & Salvage Ltd | Macclesfield | 2025 |
| Auto Solutions 2000 Limited | Nottingham | 2009 |
| Auto Spares & Salvage Limited | Wellingborough | 2006 |
| Autoburkon Limited | Alfreton | 2025 |
| Autogreen Limited | Daventry | 2004 |
| Autoline Motors Limited | Stoke On Trent | 2001 |
| Automotive Speed Ltd | Doncaster | 2025 |
| Automotive Venture Ltd | Camberley | 2024 |
| Autoparts Precious Metals (UK) Limited | Horsham | 2015 |
| Autopoint (Falkirk) Ltd. | Falkirk | 2026 |
| Autorecycling Limited | Bellshill | 2009 |
| AVA Recycling Ltd | Halifax | 2018 |
| AVA Shipping Ltd | Kent | 2024 |
| AVA Skip Hire Limited | Bolton | 2022 |
| AVA Skip Limited | Yeovil | 2000 |
| AVA Steel (Group) Ltd | London | 2022 |
| AVA Steel (UK) Ltd | London | 2022 |
| AVA Waste Management Group Limited | Claremount | 2015 |
| Avada Environmental Ltd | Dungannon | 2013 |
| Avalanche Pallets Ltd | Dartford | 2025 |
| Avalon Metals Limited | Rotherwas Ind Estate Hereford | 1996 |
| Avalon Waste Management Limited | Taunton | 2010 |
| Avanta Facilities Management Limited | Stowmarket | 2016 |
| Avatar Tech Limited | Ilford | 2019 |
| Avax Suction Ltd | Shefford | 2022 |
| AVC Weeeco Limited | Letchworth Garden City | 2010 |
| Aveho Group Ltd | Birmingham | 2019 |
| Avena Environmental Limited | Dereham | 2010 |
| Avena Innovations Ltd | Dereham | 2021 |
| Avenue Recycling Limited | | 2004 |
| Averham Park Residents Association Limited | Nottinghamshire | 1993 |
| Avfall Ltd | Royal Victoria Docks | 2019 |