| Amberflo Smart-T Ltd. | Glasgow | 2018 |
| Amberley Farm Management Company Limited | Ripley | 1998 |
| Ambialet Ltd | Sunderland | 2010 |
| Ambient Water Treatment Limited | Redditch | 2022 |
| Ambipar Response Limited | London | 2006 |
| Ambipar Site Services Limited | London | 2000 |
| Amco (UK) Ltd | Bury St. Edmunds | 2008 |
| Ameland Reprocessing Ltd | Coventry | 2026 |
| Amelia Enterprises Ltd | Bristol | 2024 |
| Amelio Utilities (Gloucester) Limited | Gloucester | 1999 |
| Amenities Limited | Northampton | 2002 |
| Amentum (UK) Ltd. | Warrington | 2000 |
| Ameri Group Ltd | St. Leonards-On-Sea | 2024 |
| AMF Cats Limited | Evesham | 2010 |
| AMG Tipper & Grab Hire Ltd | Croydon | 2016 |
| Amgen Rhondda Limited | Aberdare | 1998 |
| Amiante Abatement Solutions Ltd | Liverpool | 2024 |
| Amianto Services Limited | Bootle | 2013 |
| Amigo Removals Ltd | London | 2017 |
| Amix (Manchester) Limited | Bolton | 2012 |
| AMJ Strip OUT Limited | Kenilworth | 2020 |
| Amleya Ltd | Romford | 2017 |
| Ammonite Removals and Clearance Limited | Lyme Regis | 2017 |
| Amoha Impex Limited | Ipswich | 2025 |
| AMP Drainage Solutions Ltd | Preston | 2026 |
| AMP Waste Management Ltd | Audenshaw | 2021 |
| AMP5 Ltd | Hoddesdon | 2010 |
| Amphibia (UK) Limited | Bromley | 2001 |
| Amphibia Limited | Bromley | 2025 |
| Ampthill Metal Company Limited | Ampthill | 1979 |
| Amrubbishclearance Ltd | Slough | 2021 |
| AMS Enviro Ltd | London | 2025 |
| AMS Industrial Ecology Limited | Saffron Walden | 2014 |
| Amstech Asbestos Removals Limited | Hailsham | 2014 |
| Amstech Inspections & Testing Limited | Hailsham | 2014 |
| Amusement Design Limited | Burton On Trent | 1983 |
| Amza Limited | London | 2022 |
| ANA Enviro Services Ltd | Southampton | 2022 |
| Anambra Wolf Ltd | Barking | 2024 |
| ANC Recycling Ltd | Sunderland | 2024 |
| Ancala Fornia Holdco Limited | Havant | 2016 |
| Ancala Fornia Limited | Havant | 2016 |
| Ancala Fornia Midco Limited | Havant | 2016 |
| Ancala Water Services (Defence) Limited | Barnsley | 2002 |
| Ancala Water Services (Estates) Limited | Barnsley | 2002 |
| Ancala Water Services Holdco Limited | London | 2017 |
| Anchor Green Ltd | London | 2011 |
| Anchor Group Solutions Limited | Huddersfield | 2026 |
| Anchor Recycling & Waste Management Ltd | Watford | 2020 |
| Ancient Remnant Development Ltd | London | 2026 |
| Ancillary Components Limited | Northamptonshire. | 2022 |
| Ancorra Environmental Limited | Newry | 2025 |
| Ancorra Environmental Services Ltd | Liverpool | 2012 |
| Andaman Group Ltd | Halifax | 2023 |
| Andania Civil Engineering Services Ltd. | Halifax | 2001 |
| Anderson Waste Management Ltd | Dunstable | 2021 |
| Andersons Drainage Solutions Ltd | Bristol | 2019 |
| Andersons Waste Management Ltd | Bristol | 2000 |
| Andersons Waste Treatment Centre Ltd | Bristol | 2012 |
| Andidrain Limited | London | 2008 |
| Andlee Drainage Solutions Ltd | Droylsden | 2026 |
| Andrassy Property Services Limited | Wakefield | 2003 |
| Andrew and Brother Ltd | Dagenham | 2023 |
| Andrew Bendall Ltd | Bristol | 2015 |
| Andrew Cook (Containers) Limited | Fife | 1990 |
| Andrew Jackson Waste Ltd | Ware | 2022 |
| Andrew Oliver Waste Management Ltd | Derby | 2025 |
| Andrew's Recycling Limited | Birmingham | 2013 |
| Andrews Recovery Limited | Middlesex | 2000 |
| Andusia Hazchem Treatment Limited | Hertford | 2015 |
| Andusia Limited | Hertford | 2019 |
| Andy Bees Metal Management Limited | Margate | 2024 |
| Andy Bees Waste Management Limited | Margate | 2024 |
| Andy Campbell Recycling Limited | Southport | 2001 |
| Andy's Garden Maintenance Ltd | Hemel Hempstead | 2021 |
| Anenta Ltd | Putney | 2013 |
| Angel of Mercy Limited | London | 2013 |
| Angel Recycling Ltd | London | 2019 |
| Angel Springs Sarl | London | 2018 |
| Angel Trust Trading Limited | Bishop Auckland | 2023 |
| Angela Mullen Ltd | Aviemore | 2015 |
| Angels Removals Ltd | Broadstone | 2024 |
| Angl OIL Ltd | Bridlington | 2023 |
| Anglegovern Limited | Bridgend | 1996 |
| Anglia Aggregates Limited | Maldon | 2026 |
| Anglian Confidential Data Services Limited | King'S Lynn | 2005 |
| Anglian Environmental Services Limited | Essex | 2000 |
| Anglian Grab Ltd | Norwich | 2013 |
| Anglian Project Management Limited | Aylsham Norwich | 1996 |
| Anglian Septics Ltd | York | 2025 |
| Anglian Upcycling Ltd | Ipswich | 2023 |
| Anglian Water Business (National) Limited | Durham | 1995 |
| Anglian Water Services Limited | Huntingdon | 1989 |
| Anglo Asbestos Ltd | Altham | 2022 |
| Anglo Doorstep Collections Ltd | Hersham | 2023 |
| Anglo Finance Corporation Limited | London | 2007 |
| Anglo Great Lakes Corporation Public Limited Company | | 1956 |
| Anglo Recycling Company Limited | Hersham | 2012 |
| Anglo Scottish Recycling Company Limited | Falkirk | 2013 |
| Angus Ward Holdings Limited | County Durham | 2025 |