| Acre Metals Limited | London | 1998 |
| Acre Skips Ltd | Greenford | 2014 |
| ACS Business Group Ltd | Kenley | 2010 |
| ACS Skip Hire (MCR) Limited | Manchester | 2010 |
| ACT Group Limited | Manchester | 2024 |
| Action Clearance Ltd | Poole | 2025 |
| Action Enviro Limited | Hailsham | 2003 |
| Action Metals Limited | Lytham St. Annes | 2013 |
| Actionwasteremovals Ltd | Rowley Regis | 2024 |
| Activa Trade Marketing Limited | London | 2025 |
| Active Demolition and Waste Services Ltd | Rotherham | 2016 |
| Active Drainage Services Ltd | West Malling | 2024 |
| Active Drainage Solutions Limited | Ringwood | 2009 |
| Active Environmental Management Limited | Dunstable | 2014 |
| Active Reactive Solutions Ltd | Wakefield | 2025 |
| Active Regeneration Limited | Leyland | 2017 |
| Active Rubbish Clearance Ltd | Dorking | 2017 |
| Active Water Services Ltd | Lanark | 2017 |
| Active World Solutions C.I.C. | Faringdon | 2019 |
| ACTIVE8 Water Services Ltd | Upminster | 2023 |
| Actonx Services and Construction Limited | Brighton | 2019 |
| Actual Support Services Limited | Hornchurch | 2000 |
| Acumen Group Holdings Limited | Knottingley | 2018 |
| Acumen Solutions Limited | Goole | 2002 |
| Acumen Waste Services Limited | Knottingley | 1994 |
| Acwa Services Limited | Skipton | 1986 |
| AD Septic Tanks Ltd | Bordon | 2026 |
| AD Skip Hire Ltd | Leicester | 2023 |
| AD Waste Transfer Limited | Carlisle | 2008 |
| ADA & EMA LEO Beam Limited | Stourbridge | 2025 |
| Adage Consultancy Limited | Holmfirth | 2024 |
| Adam & IAN Mcdonald Services Limited | Gateshead | 1999 |
| Adam Removals Ltd | London | 2018 |
| Adamah Recycling Ltd | London | 2025 |
| Adamson’S Independent Traders Ltd | Bo'Ness | 2022 |
| Adapt Drainage Services Ltd | Chesterfield | 2024 |
| Addison Green Limited | York | 2012 |
| Address Waste OIL Ltd | London | 2022 |
| Addy Engineering Services Ltd | Huddersfield | 2014 |
| Addymans Recycling Ltd | Knaresborough | 2017 |
| Adelphi Property Services Ltd | Harlow | 2019 |
| Adenco UK Limited | London | 2014 |
| Adept Pure Water Limited | Wellingborough | 2003 |
| ADI DIR Building Ltd | Gillingham | 2022 |
| ADI Maintenance Limited | Sutton Coldfield | 2023 |
| Adisak Water Technology Co., Ltd | Cambridge | 2023 |
| Adisel Limited | Morley | 2007 |
| Adjustable Polymers Ltd | Ipswich | 2018 |
| ADK Drains Ltd | Nottingham | 2018 |
| ADL Waste Removal Limited | Milton Keynes | 2026 |
| ADM Cleaning Services Limited | London | 2022 |
| ADM Drainage Services Ltd | Stevenage | 2026 |
| ADM Environmental Services Limited | Weymouth | 2026 |
| Admec Environmental Services Limited | Birtley | 2010 |
| Admin (Waste Removal) Limited | Sheffield | 2024 |
| Admiral Waste Recycling and Maintenance Limited | Waterlooville | 2017 |
| Admire Drainage Limited | London | 2024 |
| Admire Group Ltd | Edgware | 2020 |
| ADP Resource Ltd | Somerton | 2016 |
| Adparatio Ltd | Middlesbrough | 2023 |
| Adrian & Iwona Ltd | Ipswich | 2017 |
| Adrian Francis Limited | Manchester | 2017 |
| ADS Drainage Ltd | Liverpool | 2026 |
| ADS Waste Management Limited | Sevenoaks | 2026 |
| ADS Waste Recycling Limited | Lymm | 2011 |
| ADT Distribution Ltd | King'S Lynn | 2021 |
| Advance Connections Limited | Ilford, Essex | 2011 |
| Advance Group Europe Ltd | Cornwall | 2025 |
| Advance Maintenance and Rubbish Removals Ltd | Birmingham | 2018 |
| Advance Skip Hire Ltd | Liverpool | 2020 |
| Advance Waste Ltd | Dagenham | 2020 |
| Advance Water Treatment Technologies Limited | Leighton Buzzard | 2018 |
| Advanced Aeration Ltd | Waterlooville | 2009 |
| Advanced Alloy Services Limited | York | 1993 |
| Advanced Asbestos Contractors (South East) Limited | Chelmsford | 2009 |
| Advanced Demand Side Management Limited | Windsor | 1992 |
| Advanced Demolition Limited | Stowmarket | 1997 |
| Advanced Drainage Technologies Ltd | Wickford | 2022 |
| Advanced Fuel Partners Limited | London | 2023 |
| Advanced Hydro Limited | Challock | 2010 |
| Advanced Metal Innovation Co Ltd | Nottingham | 2009 |
| Advanced Metal Recovery Ltd | Sheffield | 2022 |
| Advanced Pump and Hydro Systems Limited | Worcester | 2017 |
| Advanced Recycling & Recovery Limited | Epping | 2024 |
| Advanced Rose Healthcare Services Ltd | Livingston | 2021 |
| Advanced Site Solutions Ltd. | Birchington | 2020 |
| Advanced Trench-Less Technologies Ltd | Maidstone | 2018 |
| Advanced Typesetting Technology Limited | Chester Road | 1985 |
| Advanced Utility Services Ltd | Ilford | 2023 |
| Advanced Waste Management Limited | Ruislip | 2020 |
| Advanced Waste Solutions Ltd | Telford | 2011 |
| Advanced Wastewater & Drainage Limited | Birmingham | 2002 |
| Advanced Wastewater Treatment Ltd | Worcester | 2017 |
| Advanced Water Infrastructure Networks Limited | Braintree | 2023 |
| Advanced Water Softeners Limited | Southampton | 2003 |
| Adviceunit Limited | Peterborough | 1995 |
| Adwani Motors Limited | Darlington | 2022 |
| Adwick Waste Recycling Limited | Cockermouth | 2012 |
| AE & at Lewis (Waste) Ltd | Holyhead | 2026 |
| AE Waste Management Ltd | East Kilbride | 2024 |