| S6 Environmental Ltd | Southend-On-Sea | 2024 |
| SA 1 Pallets Ltd | Swansea | 2011 |
| Saatra Ltd | Bicester | 2021 |
| SAB Scrap Metals Ltd | Waltham Cross | 2025 |
| Sabac Holding Ltd | London | 2019 |
| Saber Construction London Limited | London | 2024 |
| Sable & Co.(Uk) Limited | Whyteleafe | 1999 |
| Sabre Recycling Ltd | Harrow | 2018 |
| Sackers Limited | Ipswich | 1980 |
| Sacriston Auto Dismantlers Ltd | Consett | 2014 |
| Sadat Contracting Group Ltd | Harrow | 2025 |
| Saddletoll Limited | Usk | 1976 |
| Saddleworth Environmental Services Limited | Rochdale | 2017 |
| Sadies Skips Limited | Stockton-On-Tees | 2009 |
| Sadlers Waste Limited | Heanor | 2001 |
| Safe Aqua Limited | Wrexham | 2016 |
| Safe Asbestos Removal Ltd | Ashton-Under-Lyne | 2020 |
| Safe Elimination Services Ltd | Chatham | 2018 |
| Safe Grip Tyres and Recycling Ltd | Manchester | 2026 |
| Safe Hands Security & Events Services Ltd | Llanelli | 2025 |
| Safe Scene Solutions Ltd | Sheffield | 2025 |
| Safe Skips Waste Management Ltd | Leicester | 2018 |
| Safe Strip UK Limited | Sunderland | 2007 |
| Safe Waste & Build Ltd | Harlow | 2024 |
| Safeclear Environmental Solutions Ltd | Bishop'S Stortford | 2025 |
| Safeenviro Ltd | Birmingham | 2018 |
| Safegroup Services Limited | London | 2017 |
| Safeguard Asbestos Services Limited | Addlestone | 2025 |
| Safelec Ltd | Cannock | 2012 |
| Safeli Recycling Ltd | Birmingham | 2025 |
| Safeline Environmental Limited | Kidderminster | 2006 |
| Safeline Waste Limited | Kidderminster | 2022 |
| Safepath Environmental Limited | Colchester | 2025 |
| Safepoint Asbestos Ltd | Wilmslow | 2025 |
| Safer Homes Limited | Esher | 2016 |
| Safesystems Water Services Limited | Sandbach | 2025 |
| Safetouch Exterior Cleaning Ltd | Dagenham | 2023 |
| Safety Industries (Dormant) Limited | | 1992 |
| Safevape Ltd | Leeds | 2025 |
| Safewaste Limited | London | 1990 |
| Safewater Legionella Control Limited | Heywood | 2019 |
| Safewater Solutions Limited | Milton Keynes | 2011 |
| Safeway Skips Ltd | Bacup | 2020 |
| Safezone Asbestos Solutions Ltd | Farnborough | 2023 |
| Saffron Recycling Limited | Saffron Walden | 2025 |
| Saga Autocare Ltd | Dewsbury | 2016 |
| Sagittarius Recycling & Waste Management Limited | London | 2012 |
| Sagm Ltd | Barnsley | 2021 |
| Sahara (Melksham) Limited | Wiltshire | 1947 |
| Sahwira Ltd | London | 2025 |
| Saica Natur UK Limited | Manchester | 1994 |
| Sait Shipping Limited | Doncaster | 2020 |
| Sait Systems & Trading Limited | Rotherham | 2004 |
| Sale Skip Hire Limited | Manchester | 2025 |
| Salford Excavations Construction Limited | Bolton | 2014 |
| Salford Excavations Haulage Limited | Manchester | 2017 |
| Salford Group Ltd | Salford | 2018 |
| Salford Property Maintenance Ltd | Manchester | 2023 |
| Salford Skip Hire Ltd | Salford | 2006 |
| Salibel Limited | London | 2025 |
| Salient Water Ltd | London | 2023 |
| Salinity Solutions Ltd | London | 2020 |
| Salisbury Processing Solutions Ltd | Salisbury | 2024 |
| Salt Asbestos Services Ltd | Glasgow | 2015 |
| Saltire House Clearance Ltd | Edinburgh | 2023 |
| Saltworks Ltd | Belfast | 2011 |
| Salus Water Technology Ltd | London | 2015 |
| Salvage Operations Limited | Falkirk | 2024 |
| Salvage Recovery Ltd | Birmingham | 2024 |
| Salvage Wise Ltd | Ferndown | 2023 |
| Salvatex Collections Limited | Northampton | 2002 |
| Salvum Investments Ltd | Bath | 2025 |
| Salway Excavations Limited | Stoke-On-Trent | 2017 |
| SAM and Boca Builders Ltd | Ilford | 2022 |
| SAM Eden Ltd | Southampton | 2022 |
| SAM Magnet Exports (UK) Ltd | Luton | 2026 |
| SAM Magnet UK Limited | Luton | 2010 |
| SAM Maintenance Limited | London | 2012 |
| SAM N SON Ltd | London | 2020 |
| SAM Waste Recycling Ltd | Slough | 2017 |
| Sam's Vehicle Collection Limited | Dorchester | 2017 |
| Sama GR Ltd | London | 2026 |
| Samco (Norton) Limited | Shifnal | 2001 |
| Samco Group Ltd | East Grinstead | 2017 |
| Same Day Recycling Ltd | Billericay | 2021 |
| Same Day Waste Disposal Ltd | Cardiff | 2024 |
| Same Water Ltd | London | 2013 |
| Samliv Property Services Limited | South Croydon | 2014 |
| Samotlor 2 Ltd | Ilford | 2020 |
| Sams Recycling Limited | Southall | 2014 |
| Sams Environmental Services Ltd | London | 2026 |
| Sams Skip Hire LT Ltd | Slough | 2026 |
| Sams Skip Hire Ltd | Slough | 2022 |
| Sams Yard Limited | Rainham | 2012 |
| Samson Recycling Limited | West Midlands | 2021 |
| Samui Country Trading Co Ltd | Cardiff | 2021 |
| Sana Waste Limited | Sevenoaks | 2024 |
| Sanatex Ltd | Hounslow | 2015 |
| Sanaway Limited | Hounslow | 2006 |
| Sanctus Limited | Gloucester | 2003 |