| Storie (Argyll) Limited | Ayr | 1968 |
| Storie's Recycling Ltd | Ashington | 2025 |
| Stormforce Alarm Distribution Ltd | Stratford-Upon-Avon | 2025 |
| Stormharvester Limited | Belfast | 2017 |
| Stormsaver Limited | Newark | 2003 |
| Stornoway Skips Limited | Stornoway | 2023 |
| Stort Mill Recycling Ltd | Harlow | 2012 |
| Storvite Services Ltd | Rayleigh | 2025 |
| Stourbridge Skip Hire Limited | Rowley Regis | 2018 |
| Stourton Court Services Limited | Brierley Hill | 1985 |
| Stowmarket Skips Ltd | Stowmarket | 2020 |
| Stozone Limited | Whitley Bay | 2014 |
| Stradiological Ltd | West Kilbride | 2018 |
| Straight Waste Ltd | London | 2024 |
| Strand Recycling Ltd | Ballyclare | 2026 |
| Strategic & Operational Estates Ltd | Sheffield | 2014 |
| Strategy Energy Services Limited | Haringey | 2012 |
| Stratford Waste Management Ltd | Benfleet | 2025 |
| Strathclyde Skip Hire and Recycling Limited | Falkirk | 2006 |
| Strathclyde Water Company Ltd | Glasgow | 2022 |
| Strattons Liquid Waste Disposal Ltd. | Wisbech | 2002 |
| Straw Innovations Ltd | Harpenden | 2016 |
| Strawberrycars. UK. Ltd | Enfield | 2017 |
| Stray Sheep Services Limited | Kingston Upon Thames | 2019 |
| Stream Water Treatment Ltd | Chatham | 2023 |
| Streamline Conservatories Limited | Storrington | 1990 |
| Street Fuel Limited | Leigh On Sea | 2009 |
| Street Fuel Trading Limited | Orsett | 2011 |
| Street Level Management Groups Ltd | Cardiff | 2018 |
| Streetly Resources Limited | Lichfield | 2018 |
| Streets Metal Limited | Milton Keynes | 2014 |
| Stretton Grange Community Management Company Limited | Ledbury | 2010 |
| STRIVE4PURPOSE Recycling Ltd | Manchester | 2026 |
| Strong AS a Lion Ltd | Bexhill-On-Sea | 2022 |
| Struan James Clearance Group (Sjcg) Limited | London | 2026 |
| Structural Limited | Liss | 2024 |
| Strumat Limited | Llandeilo | 2002 |
| STS 25 Ltd | Lowestoft | 2026 |
| STS Metal Recycling Limited | Bradford | 2013 |
| Stuart Nichols Waste Disposal Limited | Daventry | 2005 |
| Stuarts Skip Hire Ltd | Swansea | 2014 |
| Stubbs Waste Management Ltd | London | 2022 |
| Study Home Improvement Ltd | Halesowen | 2025 |
| Sturdy Aggregates Midlands Limited | Nottingham | 2024 |
| Sturdy Aggregates North Limited | Nottingham | 2024 |
| Sturdy Aggregates South Limited | Nottingham | 2024 |
| Stus Scrap Collection Limited | Rickmansworth | 2021 |
| Stych Asbestos Solutions Limited | Stockton-On-Tees | 2026 |
| SUB Group Ltd | Doncaster | 2015 |
| Subadra Consulting Limited | Stoke Mandeville | 2002 |
| Subrite Homes Limited | London | 2021 |
| Subsea Infrastructure Limited | Greater London | 2004 |
| Substrate Biochar Ltd | Cambridge | 2024 |
| Sucatao Salvage Ltd | London | 2025 |
| Sudn Trading Ltd | Basildon | 2020 |
| Suez Advanced Solutions UK Limited | Maidenhead | 2006 |
| Suez Connect UK Ltd | Maidenhead | 2019 |
| Suez Recycling and Recovery Kirklees Ltd | Maidenhead | 1998 |
| Suez Recycling and Recovery Lancashire Ltd | Maidenhead | 1991 |
| Suez Recycling and Recovery North East Ltd | Maidenhead | 1988 |
| Suez Recycling and Recovery Packington Ltd | Maidenhead | 1979 |
| Suez Recycling and Recovery Scotland Ltd | Edinburgh | 2003 |
| Suez Recycling and Recovery South East Ltd | Maidenhead | 1934 |
| Suez Recycling and Recovery South Gloucestershire Ltd | Maidenhead | 2000 |
| Suez Recycling and Recovery Southern Ltd | Maidenhead | 1971 |
| Suez Recycling and Recovery Suffolk Ltd | Maidenhead | 2010 |
| Suez Recycling and Recovery Surrey Ltd | Maidenhead | 1996 |
| Suez Recycling and Recovery UK Ltd | Maidenhead | 1988 |
| Suez UK Environment Ltd | Maidenhead | 1978 |
| Suffolk Asbestos Ltd | Haverhill | 2022 |
| Suffolk Clearance Group Ltd | Mildenhall | 2023 |
| Suffolk Coastal Norse Limited | Norwich | 2004 |
| Sugarecycle Limited | Camberley | 2022 |
| SUK Waste Paper Limited | Blackburn | 2018 |
| Sulborne Sewerage Services Ltd | Romsey | 2023 |
| Suli Services Ltd | Chelmsford | 2024 |
| Sulis Waste Disposal Ltd | Bath | 2025 |
| Sullivan Engineering Limited | Bristol | 1995 |
| Suma (Sales) Limited | Derbyshire | 1986 |
| Summercourt Scrap Yard Limited | Newquay | 2012 |
| Summerhouse Inc Ltd | Halifax | 2016 |
| Summerisland Waste Management Ltd | Loughgall | 2016 |
| Summit Drainage Solutions Ltd | London | 2025 |
| Summit Recycling Systems Limited | Tamworth | 2010 |
| Sumo Recycling Ltd | Hatters Lane Chipping Sodbury | 2016 |
| Sumo Waste and Recycling Ltd | Glasgow | 2024 |
| Sun Advanced Materials Ltd | Manchester | 2019 |
| Sun Exim Ltd | Harrow | 2013 |
| Sun Hill Residents ST. Harmon Limited | Llandrindod Wells | 2015 |
| Sun International Recycling Group Ltd | Manchester | 2019 |
| Sun Recycling Limited | Manchester | 2004 |
| Sundorne Products (Llanidloes) Limited | Welshpool | 1997 |
| Sunefun Ltd | Manchester | 2026 |
| Sunnyside Pet Cremation Services Ltd | Swadlincote | 2022 |
| Sunnyvale Pet Cremation Cardiff Ltd | Cardiff | 2023 |
| Sunrayrecycle CIC | Surbiton | 2024 |
| Sunrise Skip Hire Limited | Hayes | 2014 |
| Super Fast Service Limited | London | 2021 |
| Super Flow Plumbing & Drainage Ltd | Iver | 2019 |
| Super Green Recycling Ltd | Newtownstewart | 2015 |