| Sanderson Environmental Limited | Alresford | 2002 |
| Sanderson Waste Removal Limited | Plymouth | 2022 |
| Sandford Bulk Services Limited | Consett | 2019 |
| Sandhoe Removals Ltd | London | 2024 |
| Sandringham Commodities Limited | Essex | 2010 |
| Sandsfield Gravel Company Limited | Driffield | 1966 |
| Sandstone NW Ltd | Birmingham | 2013 |
| Sandstop Quarries Ltd | North Newbald | 2005 |
| Sandu Motors Ltd | Spalding | 2016 |
| Sandwell Stripping Limited | Dudley | 2001 |
| Sandy Grab Services Limited | Sandy | 2021 |
| Sandywell Limited | Whittington | 2022 |
| Saniplex Ltd | Blackpool | 2021 |
| Sanipur UK Ltd | Peterborough | 2019 |
| Sanito's Touch Ltd | Burntwood | 2025 |
| Sanitologic Ltd | Mauchline | 2026 |
| Sanjack Building Co Ltd | Dartford | 2020 |
| Sansanda Limited | London | 2023 |
| Sansaw Utilities Limited | Shrewsbury | 2023 |
| Sapcote Quarry Co Limited | Coventry | 2016 |
| Sapphire Construct Limited | Barnsley | 2025 |
| Sapphire Environmental Ltd. | Hexham | 2010 |
| Sapphire Haulage Ltd | West Bromwich | 2023 |
| Sapphire Utility Solutions Limited | Leeds | 2013 |
| Sapphire Water Softeners Limited | Smarden | 2017 |
| Sarena Water Tanks Ltd | Colchester | 2023 |
| Sarita Associates Ltd | London | 2023 |
| SAS Drain Services (NW) Ltd | Bolton | 2011 |
| SAS Environmental Limited | Milton Keynes | 2015 |
| SAS Total Services Limited | St. Helens | 2012 |
| SAS Total Services N/W Limited | Manchester | 2018 |
| SAS Utilities Limited | Craven Arms | 2018 |
| SAS Waste Limited | Sutton | 1999 |
| SAS Waste Management Ltd | Potters Bar | 2020 |
| SAS Water Limited | Norton | 2006 |
| Satat Properties Ltd | Rugby | 2020 |
| Satec Service Limited | Henley-On-Thames | 2012 |
| Satin Services Ltd | Salford | 2025 |
| Sats Recycling Ltd | Beaconsfield | 2023 |
| Saunders Complete Waste Management Limited | Swindon | 2005 |
| Saur Services (Glasgow) Limited | Leeds | 1998 |
| Savana Environmental Limited | Durham | 2008 |
| Savannah Logistic Services Ltd | Bedford | 2025 |
| Savannah Solutions Ltd | Bolton | 2025 |
| Save the World Club | Kingston Upon Thames | 2002 |
| Savtech Asbestos Solutions Ltd | Hooton | 2022 |
| Savy Recycling Ltd | Whitby | 2025 |
| Sawitech IT Recycling & Disposal Solutions Ltd | Coventry | 2020 |
| Saxon Kent Ltd | Sevenoaks | 2026 |
| Saxon Skips Ltd | Bedford | 2021 |
| Saxonymasters Ltd | Wembley | 2018 |
| Saxon’S Clearance Family Business Ltd | London | 2025 |
| SB Cleaning Solutions Ltd | Norwich | 2012 |
| SB Drain Services Ltd | Hertfordshire | 2018 |
| SB Drainage Limited | Belper | 2011 |
| SB Drainage Solutions Ltd | Ripley | 2020 |
| SB Recycling Limited | Wisbech | 2014 |
| SB Waste Ltd | London | 2025 |
| SB Waste Management Limited | Blackpool | 2006 |
| SB Waste Recycling Ltd | London | 2021 |
| Sbnt Limited | Stockton-On-Tees | 2008 |
| SBR Sylhet Limited | Scunthorpe | 2025 |
| SBR Waste Solutions Limited | Scunthorpe | 2025 |
| Sbrb Limited | London | 2011 |
| Sbrwaste Limited | Carmarthen | 2025 |
| SBS Contractor Services Ltd | Inverness | 2023 |
| SBS Waste Services Ltd | Retford | 2023 |
| SC Asbestos Ltd | Winchester | 2018 |
| SC Bartter Gardening & Waste Removal Ltd. | Lichfield | 2019 |
| SC Refurbishments and Maintenance Ltd | Glasgow | 2026 |
| SC Resourcing and Supply Limited | Grays | 2026 |
| SC Waste Management Limited | Portsmouth | 2025 |
| SC008669 Limited | Glasgow | 1913 |
| Scanbio (Scotland) Limited | Edinburgh | 1997 |
| Scancross Asbestos Surveys Ltd | Thame | 2026 |
| Scarborough Environmental Infrastructure Limited | Preston | 2021 |
| Scarlet Water Ltd | Eastleigh | 2023 |
| SCB (Oxford) Limited | Abingdon | 2010 |
| Schf H2O Ltd | Keighley | 2019 |
| Schofield Waste Management Ltd | Selby | 2018 |
| Scholars Power Limited | Ilford | 2019 |
| Schreiber Furniture Limited | London | 1939 |
| Sci-Tech Water Treatment Ltd | Sheffield | 2016 |
| Scilly Coastal Clean-Up CIC | Isles Of Scilly | 2025 |
| Scilly Community Composting CIC | St. Mary'S | 2026 |
| SCK Remediation Consultancy Limited | Silsoe | 2025 |
| SCL Water Limited | Barnstaple | 2007 |
| SCM Recycling Limited | Bury | 2025 |
| Scone Drainage Services Limited | Perth | 2018 |
| Scoobys Clearance Team Ltd | London | 2025 |
| Scoop and Go Ltd | Taunton | 2025 |
| Scoop Dotty Dog Limited | Southport | 2015 |
| Scoop Patrol Ltd | Newbury | 2025 |
| Scope Innovations Limited | Waterlooville | 2022 |
| Scorpion Skip Hire Limited | Romford | 2018 |
| Scot Drain Limited | West Linton | 2012 |
| Scot Recycling Ltd | Bury | 2024 |
| Scot-Rod Drainage Services Ltd | Dunbar | 2025 |
| Scotia Drainage and Plumbing Ltd | Stirling | 2021 |
| Scotia Water Dalmuir (Holdings) Limited | London | 1999 |