| Allgood Drainage & Plumbing Ltd | Tadcaster | 2019 |
| Allguards Safety Engineering Limited | Essex | 1979 |
| Alliance Environmental Services Ltd | Middlewich | 2017 |
| Alliance Facilities Management Limited | Wirral | 2011 |
| Alliance Recycling (UK) Ltd | Lincoln | 2015 |
| Alliance Waste Management Ltd | London | 2025 |
| Allied Drainage Ltd | South Croydon | 2008 |
| Allied Pallets Solutions UK Ltd | Birmingham | 2022 |
| Allied Standard Limited | Ilford | 2002 |
| Allied Waste Management Ltd | Uckfield | 2005 |
| Allington O&M Services Limited | Doncaster | 1990 |
| Allington Waste Company Limited | Doncaster | 2003 |
| Allmet Recycling Ltd | West Bromwich | 2021 |
| Allowenshay Water Company Limited | Ilminster | 2014 |
| Alloy Artistry Limited | Bedford | 2025 |
| Allport Metal Recycling Limited | Porthmadog | 2005 |
| Allpump Services Limited | Carmarthen | 2000 |
| Allseal Cleaning Services Limited | Romsey | 2015 |
| Allsector Property Services Ltd | Redhill | 2025 |
| Allsorts Recycling Limited | Dumbarton | 2013 |
| Allspares (Hull) Limited | Hull | 2011 |
| Allstar Environmental Limited | Kidderminster | 2018 |
| Allwaste (Berkshire) Limited | Slough | 2005 |
| Allwater Technologies Ltd | Cheddar | 2011 |
| Allwood Recycling Solutions Limited | Manchester | 2010 |
| ALM Consult Limited | Skelmersdale | 2013 |
| Almasi Ecotrade Ltd | Milton Keynes | 2020 |
| Aloona Ltd | Wednesbury | 2026 |
| Alpha FM Services Ltd | Chesterfield | 2006 |
| Alpha Asbestos Solutions Ltd | Windsor | 2025 |
| Alpha Coating Industries Limited | Weald | 1991 |
| Alpha Construction Solutions Ltd | London | 2025 |
| Alpha Environmental Limited | Biggin Hill | 2015 |
| Alpha Maintenance & Clearance Limited | Crawley | 2015 |
| Alpha OIL Services Ltd | Leeds | 2026 |
| Alpha Omega Trading Limited | Leicester | 2013 |
| Alpha Property Development Limited | London | 2020 |
| Alpha Recycling Services Limited | Bolton | 2008 |
| Alpha Scientific Ltd | Haresfield | 2018 |
| Alpha Scraps Buyers Ltd | Bradford | 2026 |
| Alpha Services Group Ltd | Crawley | 2026 |
| Alpha Skip Hire Limited | Stevenage | 2024 |
| Alpha Spring Water Ltd | Manchester | 2024 |
| Alpha Tanker Services Limited | Kettering | 2009 |
| Alpha Wastewater Services Limited | Bristol | 2016 |
| Alpine Tire Recycling Ltd | Milton Keynes | 2025 |
| Alps Ecoscience UK Ltd | London | 2017 |
| ALR Waste Management Ltd | St. Helens | 2024 |
| Alrate George - Waste Removals & Recycling Ltd | Ilkeston | 2025 |
| Alrate George! Waste Removals Ltd | Ilkeston | 2024 |
| Alresford Water Treatment Services Limited | Alresford | 2015 |
| Alro Services Limited | Exeter | 1999 |
| ALS Grab Hire Ltd | Watford | 2020 |
| ALS Metals Ltd | Liverpool | 2017 |
| Alsa Garient Ltd | London | 2025 |
| Alscott Management Company Limited | Barnstaple | 1997 |
| Alshalal Global Ltd | Harrogate | 2020 |
| Altal Group Ltd | London | 2023 |
| Altan Recycling Ltd | Glasgow | 2015 |
| Altan Skip Hire Ltd | Glasgow | 2015 |
| Altech Trading Company Limited | Chelmsford | 1993 |
| Altek Chemical Engineering (2000) Limited | Sudbury | 2000 |
| Alternative Cleansing Limited | Walsall | 2009 |
| Alternative Living Solutions Ltd | Nottingham | 2025 |
| Alternative Technology Limited | Leatherhead | 1982 |
| Alternative Trading 2014 Ltd | Walsall | 2014 |
| Alternative Waste Management Ltd | Cranbrook | 2019 |
| Altitude Thinking Limited | Grangemouth | 2018 |
| Altkuz Circular Economy Ltd | Suffolk | 2024 |
| Alton Road Aggregates Limited | Nuneaton | 2024 |
| Altonlord Limited | Hartlepool | 1985 |
| Altrincham Skip Hire Limited | Altrincham | 2015 |
| Alumeta Industries Ltd | London | 2026 |
| Aluminium Packaging Recycling Organisation | Bromsgrove | 1993 |
| Alutrade Limited | Oldbury | 1984 |
| Alvis Environmental Limited | Bury St Edmunds | 2005 |
| Alvis Waste Removal Ltd | London | 2018 |
| Alwaste Limited | Whitby | 2006 |
| Alwateen Limited | Newcastle Upon Tyne | 2026 |
| Alwin Limited | West Midlands | 1994 |
| Alzure Environmental Services Limited | Huntingdon | 2015 |
| AM Contracting Ltd | Ashford | 2025 |
| AM Drainage 24/7 Ltd | Stevenage | 2025 |
| AM Drainage Ltd | Bodorgan | 2024 |
| AM Event Support Limited | Airdrie | 2014 |
| AM Recycling Limited | Deeside | 2007 |
| AM Removals and Clearances Ltd | Aberdare | 2025 |
| AM Services (Brae) Limited | Shetland | 2016 |
| AM Skip & Plant Hire Limited | Maresfield | 2011 |
| AM. Waste (London) Limited | Pinner | 2004 |
| Ama-I Ltd | High Wycombe | 2023 |
| AMAC4C Ltd | Halesowen | 2024 |
| Amaco Waste Management & Recycling Ltd | Chorley | 2024 |
| Amaia Construction Limited | Newcastle Upon Tyne | 2022 |
| Amalgamated Skips Limited | Leighton Buzzard | 2012 |
| Amaning Ltd | Romford | 2025 |
| AMB Metal Recycling Limited | Crawley | 2020 |
| Amber Merchants Limited | Belfast | 2003 |
| Amber Tree Care Ltd | London | 2007 |
| Amber Valley Norse Limited | Norwich | 2020 |