| Spillaway Projects Limited | Wallingford | 2010 |
| Spirac Limited | Banbury | 1993 |
| Spirac Screenco Ltd | Banbury | 2017 |
| Spiral-Red Limited | Grays | 2015 |
| Spire Metals Limited | Chichester | 2014 |
| Spire Toys Limited | | 1996 |
| Spirebourne Environmental Services Limited | St Austell | 2022 |
| Spirebourne Limited | Barnstaple | 1980 |
| Spireway Global Ltd | 1 Finsbury Square | 2017 |
| Spivey Waste Management Limited | Huddersfield | 2002 |
| SPK Engineering Limited | Matlock | 2013 |
| Splashes Pure Water Filtration Ltd | Derby | 2020 |
| Splinters Wood Recycling C.I.C. | Newport Pagnell | 2020 |
| Sporadicate Limited | Ilford | 2025 |
| Sporcan Limited | | 1983 |
| Sportex Recycling Ltd | Grangemouth | 2023 |
| Sports Recycler Ltd | South Shields | 2005 |
| Spot on Southern Limited | Slough | 2007 |
| Spotless H20 Limited | Chelmsford | 2017 |
| Spotless Water Ltd | Poole | 2016 |
| Spotmix Liverpool Ltd | Liverpool | 2013 |
| Spotted Octopus Recycling Limited | Solihull | 2025 |
| Spredhadar Ltd | Newcastle | 2025 |
| Spriggs Reclaim Limited | Peterborough | 2023 |
| Springbore Limited | Bradford | 2017 |
| Springers Gardens & Landscapes Ltd | Littlehampton | 2015 |
| Springfields Segregated Assets Limited | Preston | 2010 |
| Springhead Company Limited | Seaton | 1980 |
| Springhill Water Services Limited | Halifax | 2003 |
| Springs N Things Ltd | Dereham | 2025 |
| Springwell Lane Metal Recycling Limited | Rickmansworth | 2023 |
| Springwell Renewables Ltd | Dungannon | 2013 |
| Sprint Waste Clearance Ltd | Sutton | 2019 |
| Spruce Carpets Ltd. | Glasgow | 2005 |
| Spruced Property Services Ltd | London | 2025 |
| SPS Environmental Limited | Hildenborough | 2013 |
| SQ Plastics Ltd | Cardiff | 2011 |
| Sqep Recycling Limited | Bristol | 2023 |
| Square and Compass Sewage Treatment Services Ltd | Basingstoke | 2025 |
| Squibb Group Limited | London | 1972 |
| SR Moore Ltd | Carnforth | 2020 |
| Srgrabhire Ltd | Ross-On-Wye | 2023 |
| SRH (North West) Limited | Bolton | 2005 |
| SRH Waste Management Ltd | South Ockendon | 2018 |
| SRJ Project Management Services Ltd | Aberdare | 2014 |
| SRM Carver and SON Limited | Taunton | 2017 |
| SRM Recycling Ltd | Stone | 2026 |
| SRS Hull Limited | Hull | 2022 |
| SRS Skips Ltd | Dorking | 2024 |
| SS Recoveries Ltd | Manchester | 2018 |
| SS Waste Removals Ltd | Pembroke Dock, Pembrokeshire | 2025 |
| SSC North Ltd | Manchester | 2011 |
| SSG Environmental Ltd | Birmingham | 2023 |
| SSH Trading Limited | Wilmslow | 2015 |
| Ssjs Holdings Limited | Wirral | 2023 |
| Ssmd Removals Ltd | London | 2013 |
| SSR Waste Ltd | Plymouth | 2017 |
| SSS Removals Ltd | Horsham | 2025 |
| Sssi Limited | London | 2014 |
| SST Recycling Bedford Ltd | Bedford | 2024 |
| Sstm Transport Ltd | Gravesend | 2011 |
| Ssug Ltd | Coventry | 2016 |
| ST Albans Wood Recycling CIC | St. Albans | 2010 |
| ST Blazey Recycle Reuse & Resale CIC | Brighton | 2018 |
| ST Demolition Limited | Wirral | 2025 |
| ST Helens Waste Recycling Ltd | Bolton | 2008 |
| ST Hendericks Recycling Ltd | Sheffield | 2019 |
| ST Mary Magdalen Close Limited | Teignmouth | 2011 |
| ST Peter's Close (Rodmarton) Management Company Limited | Stonehouse | 1955 |
| ST. Andrews Water Company Limited | St. Andrews | 2019 |
| ST. Marks Road Gorefield Residents Limited | Wisbech | 1996 |
| Stace Skip Hire Ltd | Stoke-On-Trent | 2026 |
| Staffordshire Drain Services Ltd | London | 2017 |
| Staffordshire Environmental Ltd | Walsall | 2024 |
| Staffordshire Garden Landscaping Ltd | Stafford | 2020 |
| Staffordshire Skip Hire and Waste Recycling Group Ltd | Stoke-On-Trent | 2024 |
| Staffordshire Waste Recycling Centre Limited | Stoke-On-Trent | 2018 |
| Staffs Metal Recycling Limited | Leeds | 2012 |
| Stag Metals and Car Breakers Limited | Bilston | 2016 |
| Staines Massive Group Ltd | Staines-Upon-Thames | 2019 |
| Stainless Equipment Company (Metal Finishers) Limited | Southend-On-Sea | 2006 |
| Stairwell Cleaning Services Limited | Livingston | 2022 |
| Stalybridge Auto Salvage Limited | Stalybridge | 2014 |
| Stamford Demolition and Building Ltd | Peterborough | 2018 |
| Stan and Van Removals Ltd | Milton Keynes | 2021 |
| Stan Auto Group Limited | Waltham Abbey | 2023 |
| Stan Ellis Waste Paper Collections Limited | Flockton | 2007 |
| Stan Waste Removals Limited | Borehamwood | 2015 |
| Standard Hygiene Environmental Services Ltd | Northampton | 2017 |
| Standen's Lake and Pond Management Ltd | Brighton | 2024 |
| Standout Water Ltd | Worcester | 2026 |
| Stanro Ltd | London | 2025 |
| Stanton Environmental Limited | Derby | 2015 |
| Stanton Recycling Limited | Burton On Trent | 2004 |
| Stanton Stone Partners Limited | Staines-Upon-Thames | 2014 |
| Star Appliances Ltd | Ballymena | 2023 |
| Star Civil Engineering Limited | Coventry | 1963 |
| Star Cleaning Services Limited | Cleethorpes | 2019 |
| Star Ducting Services Limited | Cleethorpes | 2025 |
| Star Environmental Limited | Colchester | 2006 |