| Shred & Recycle Limited | Huntingdon | 2006 |
| Shred Alert Limited | Manchester | 2017 |
| Shred Cycle Limited | Northampton | 2017 |
| Shred Direct Limited | Wheatley Hill | 2012 |
| Shred Express Limited | Wolverhampton | 2025 |
| Shred to BED Ltd | Sandbach | 2020 |
| Shredall (East Midlands) Limited | Nottingham | 1997 |
| Shredall (Scotland) Limited | Bellshill | 2019 |
| Shredderbox Ltd | Ashford | 2025 |
| Shredding Solutions NI Ltd | Ballymoney | 2026 |
| Shredding UK Limited | Tarporley | 2006 |
| Shredmaster Limited | Lincoln | 2000 |
| Shredpro Limited | Stratford Upon Avon | 2007 |
| Shredsafe Secure Limited | Bootle | 2011 |
| Shredtec Recyclers Limited | Ashton-Under-Lyne | 2006 |
| Shrewsbury Drain Services Limited | Shrewsbury | 2022 |
| Shropshire Fields | Coventry | 1959 |
| Shropshire Pallet Recycling Ltd | Telford | 2015 |
| Shropshire Waste Management Limited | Maidenhead | 1991 |
| Shropshire Waste Services Limited | Telford | 2017 |
| SHS- Santos Home Services Ltd | Swindon | 2023 |
| Shyro Tattoo Studio Ltd | Croydon | 2020 |
| Shyteshifters Waste Management Services Ltd | Edinburgh | 2023 |
| Sibelco Green Solutions UK Limited | Talke | 1971 |
| Sibor Bio-Energy Ltd | London | 2021 |
| Sibs Trading Limited | Taunton | 2013 |
| Sibtons Services Ltd | Epsom | 2024 |
| SID Dennis and Sons Limited | Skegness | 2002 |
| SID Waste Limited | London | 2017 |
| Siddell Environmental Services Limited | Llanelli | 2002 |
| Sieben Rubber Industries Ltd | Derby | 2014 |
| Sigma (NW) Limited | Warrington | 2022 |
| Sigma Circular Recovery Services Ltd | Wolverhampton | 2023 |
| Sign Here! Franchising Limited | Glasgow | 1998 |
| Sign Here! Limited | Glasgow | 1996 |
| Sign Language Innovations Limited | Sheffield | 2008 |
| Sign Productions (Design & Development) Limited | Ebbw Vale | 1987 |
| Signature Clearance Ltd | Bedford | 2026 |
| Signature Clinical Waste Ltd | Dudley | 2021 |
| SIL Management Services Limited | Bradford, | 1939 |
| Silkflow Ltd | High Wycombe | 2013 |
| Siltbuster Limited | Monmouth | 2003 |
| Siltbuster Process Solutions Limited | Eastleigh | 2000 |
| Silva Recycling Limited | Wrexham | 2004 |
| Silver Birches (Stone) Limited | Birmingham | 2025 |
| Silver Bricks Grabs Limited | Uxbridge | 2019 |
| Silver Skips Lincolnshire Limited | Spalding | 2009 |
| Silver Star Catalytic Recycling Ltd | Stockport | 2021 |
| Silverback Professional Services Ltd | Benfleet | 2024 |
| Silverback Waste and Recycling Company Ltd | Sutton | 2023 |
| Silverglade Coatings Limited | Birmingham | 1995 |
| Silverline Drainage Ltd | Birmingham | 2023 |
| Silvermere Haven Limited | Leeds | 1987 |
| Silverthorn Waste Management Limited | Bishop Auckland | 2019 |
| Silverton Recycling Limited | Essex | 2007 |
| Silverwoods Waste Management Ltd | Accrington | 2010 |
| Silviu Candle of Hope Ltd | Enfield | 2024 |
| Simmonds Grab Services Limited | Brimpton Common | 2003 |
| Simon's Plumbing and Drainage Limited | London | 2024 |
| Simonswood Skip Hire Ltd | Liverpool | 2016 |
| Simpeller Limited | Greenhithe, Kent | 2025 |
| Simplas Ltd | Doncaster | 2011 |
| Simple AS Clearance Ltd | London | 2021 |
| Simple Asbestos Solutions Limited | Southampton | 2018 |
| Simple Drainage Limited | Sevenoaks | 2025 |
| Simple Plas Ltd | Belfast | 2022 |
| Simple Waste Solutions Limited | Motherwell | 2010 |
| Simpli Water Ltd | York | 2024 |
| Simplicity Recycling Ltd | Washington | 2025 |
| Simply Aquatic Services Ltd | Sapcote | 2023 |
| Simply Group Services Ltd | Loughton | 2019 |
| Simply Hygiene Washroom Solutions Limited | Stoke-On-Trent | 2009 |
| Simply Recycling Luton Limited | Luton | 2014 |
| Simply Refreshed Grimsby Limited | Grimsby | 2021 |
| Simply Shred Limited | Walsall | 2005 |
| Simply Shredding (MK) Ltd | Bedford | 2015 |
| Simply Waste Consultants Limited | Lymm | 2019 |
| Simply Water Ltd | Luton | 2016 |
| Simpson Environmental Services Limited | London | 2001 |
| Simpson Waste Services Limited | Lichfield | 2025 |
| Simpsons (East Anglia) Limited | Woodbridge | 2009 |
| Simpsons Drainage Ltd | Warminster | 2018 |
| Sims Environmental Ltd | Upminster | 2012 |
| Sims Lifecycle Services Limited | Stalybridge | 2021 |
| Simvic Limited | Chertsey, | 2011 |
| Sinclair Community Impact CIC | Wokingham | 2025 |
| Singh Grab Hire Limited | Southall | 2025 |
| Singh Rubies Clearance Ltd | Southall | 2025 |
| Singh Skips Limited | Coventry | 2023 |
| Singh Waste Management Limited | Birmingham | 2026 |
| Singhbros Europe Ltd | Burton On Trent | 2021 |
| Singing in the Drains Limited | Crawley | 2021 |
| SIP Water Limited | Tunbridge Wells | 2023 |
| Sircel (U.K.) Limited | London | 2019 |
| Siren Water Hygiene Limited | Congleton | 2025 |
| Siren Water Treatment Limited | Rotherham | 2022 |
| Sirius Demolition Ltd | Durham | 2008 |
| Sirius Environmental Ltd | Langley Moor | 2009 |
| Sirius Remediation Limited | Durham | 2003 |
| Sister Pledge Cleaning Services Ltd | Warlingham | 2016 |