| Smith Bros. Metal Recycling Limited | Witney | 2006 |
| Smith Brothers Recycling Ltd | Liverpool | 2023 |
| Smith Elite Metals Limited | Chesterfield | 2007 |
| Smith Haulage Limited | Crowthorne | 2024 |
| Smith LDN Wholesale Ltd | Cardiff | 2015 |
| Smith Recycling (Milton Keynes) Limited | Milton Keynes | 2004 |
| Smith Recycling Holdings Limited | Milton Keynes | 2023 |
| Smith's (Gloucester) Limited | Gloucester | 2000 |
| Smith's (Waste Management) Limited | Gloucester | 2010 |
| Smith's Skips Limited | Wolverhampton | 2025 |
| Smith-Maxwell Horse Ambulance Ltd | Broadway | 2026 |
| Smiths Waste Removals & Skip Hire Ltd | Runcorn | 2024 |
| Smlf Ltd | Hartlepool | 2013 |
| SMM Management Limited | Edinburgh | 2018 |
| Smooth Move Removals Ltd | Scunthorpe | 2018 |
| Smoovely Logistics Ltd | London | 2026 |
| Smpk Dorset Ltd | Bournemouth | 2022 |
| SMR Asbestos UK Ltd | Hickstead | 2019 |
| SMR Recycling Limited | Market Drayton | 2014 |
| Smrtwaste Ltd | Berkhamsted | 2023 |
| SMS Water Treatment & Engineering Limited | London | 2025 |
| Smurph Skip Hire Ltd | Newcastle | 2025 |
| Smythe-Wood's Ltd | Chertsey | 2022 |
| SN Waste Removal Ltd | Swindon | 2025 |
| Snaith Management (Irrigation) Limited | Goole | 1986 |
| Snappy Response Waste Ltd | Walsall | 2024 |
| Snappy Waste Services Limited | Eastleigh | 2016 |
| Snow White Professionals Limited | Surbiton | 2017 |
| Snowflake Animal Bedding Ltd | South Yorkshire | 2005 |
| SO Clear Services Limited | Staines-Upon-Thames | 2022 |
| SO Demolition Ltd | Chessington | 2019 |
| SO Environmental Ltd | East Grinstead | 2020 |
| SO Greene Limited | Orpington | 2021 |
| SO Recycle Ltd | Andover | 2017 |
| SO Recycling Limited | London | 2013 |
| SO Waste Ltd | Bournemouth | 2017 |
| Soak Away Drainage Solutions Ltd | Southport | 2023 |
| Soar Future Holdings Limited | Barnsley | 2024 |
| Soaroc International Limited | Altrincham | 2011 |
| Social, Environmental & Economic Solutions (Soenecs) Limited | Burgess Hill | 2014 |
| Sociomedia Ltd | Dagenham | 2024 |
| Sofia Recycling Ltd | London | 2019 |
| Sofsp UK Bidco Limited | Stockport | 2026 |
| Sofsp UK Ltd | Stockport | 2026 |
| Softflow Systems Limited | Croydon | 2014 |
| Softstrip and Clearance Management Ltd | London | 2025 |
| Softwater Solutions Ltd | Northampton | 2019 |
| Soil & Water Solutions Limited | Harrow | 2013 |
| Soil Craft CIC | Burwash | 2024 |
| Soil Haulage & Industrial Transport Ltd | Houghton Le Spring | 2025 |
| Soil Power Energy Limited | Peterborough | 2024 |
| Soil Remediation UK Ltd | Stowmarket | 2015 |
| Soil Solutions SW Ltd | Paignton | 2024 |
| Soil Systems Ltd | London | 2023 |
| Soil Treatment UK Limited | Thirsk | 2023 |
| Soilcycle Limited | Leicester | 1999 |
| Soilet Systems Limited | Ilfracombe | 2009 |
| Soilex Regeneration Limited | Harpenden | 2025 |
| Soils Recovery Limited | Gloucester | 2026 |
| Soilsafe Ltd | Darwen | 2020 |
| SOJ Services Ltd | Birmingham | 2026 |
| Sokerol International Limited | London | 2010 |
| SOL Trade Ltd | Liverpool | 2025 |
| Solar Recycling Solutions Limited | Swanscombe | 2024 |
| Solar Serve Group Ltd | London | 2024 |
| Solar Water PLC | London | 2000 |
| Solaris Facade Ltd | Ealing | 2025 |
| Solarservicesgroup Ltd | London | 2026 |
| Sole Bay Waste & Recycling Services Ltd. | Beccles | 2018 |
| Sole Movers Ltd | Dunstable | 2021 |
| Solent Industrial Plastics Limited | Hants | 1982 |
| Solent Metals Ltd | Nottingham | 2011 |
| Solent Waste Services Ltd | Portsmouth | 2020 |
| Solent Water Services Limited | Winchester | 2002 |
| Solid Contract Solutions Ltd | Canterbury | 2024 |
| Solid Timber Floor Limited | Cardiff | 2015 |
| Solid Tyre Disposals Limited | Newcastle Upon Tyne | 2016 |
| Solid Waste Group Ltd | Hounslow | 2026 |
| Solids Removal Technology Ltd | Brechin | 2016 |
| Solihull Asbestos Surveys Ltd | Solihull | 2013 |
| Solihull Skip Hire Ltd | Birmingham | 2010 |
| Sollus Compliance Services Limited | Exeter | 2025 |
| Solmicrotek Limited | Staffordshire | 2012 |
| Solo Asbestos Consultants Limited | Canvey Island | 2017 |
| Solohire Ltd | London | 2020 |
| Solomax Limited | Dorset | 1996 |
| Soloop Limited | Birmingham | 2010 |
| Soloram Express Ltd | London | 2019 |
| Solowaste Ltd | London | 2018 |
| Solrecycle Ltd | Manchester | 2023 |
| Solscape Grab Hire & Haulage Services Ltd | Bristol | 2020 |
| Solscape Wastemanagement Ltd | Bristol | 2023 |
| Solsey Waste and Environmental Limited | Swindon | 2011 |
| Solutex Limited | Wolverhampton | 2002 |
| Solution Trading & Services Limited | London | 2015 |
| Solutions 4 Japanese Knotweed Limited | Manchester | 2017 |
| Solutions Water and Air Management Limited | Lymington | 1999 |
| Solve Surplus Consultancy Ltd | London | 2021 |
| Solve Waste Limited | London | 2019 |
| Solvex Repairs Ltd | London | 2026 |