| Sowing Success Limited | Newton-Le-Willows | 2011 |
| Sowninsurrey Limited | Dorking | 2016 |
| Sowray Livestock Limited | York | 1995 |
| Soxisix Invest Ltd | London | 2022 |
| Soya UK Limited | Southampton | 2000 |
| Soyburn Limited | Buckie | 2005 |
| Soyking Limited | Milton Keynes | 2014 |
| Soysambu Conservancy (UK) Limited | Dartford | 2011 |
| SP Equine Group Ltd | Reading | 2022 |
| SP Madge and SON Ltd | Chippenham | 2026 |
| SP Services (Hull) Limited | Hull | 2023 |
| SP Skelton Limited | London | 2011 |
| SP Tree Consultancy Limited | Derby | 2019 |
| Space Foods Limited | Melton Mowbray | 1962 |
| Space for Grace Limited | Lincoln | 2019 |
| Space for Nature Ltd | Braunton | 2019 |
| Space Intelligence Ltd | Edinburgh | 2018 |
| Spaf Services Ltd | Peterhead | 2025 |
| Spagroservices Ltd | Leamington Spa | 2022 |
| Spagyric 3 Limited | Tarporley | 2014 |
| Spaldings Holdings Limited | Lincoln | 2003 |
| Spaldings Limited | Lincoln | 1981 |
| Spaldington Holdings Limited | Goole | 2013 |
| Spaniel Companions Ltd | Andover | 2025 |
| Sparkes Contracting Limited | Bristol | 2003 |
| Sparkford Estates Limited | Wells | 1956 |
| Sparkford Estates Trading Limited | Wells | 2009 |
| Sparkles PAW Paradise Limited | Chelmsford | 2025 |
| Sparkling Equine Ltd | Strabane | 2017 |
| Sparkling Invest Ltd | Frome | 2020 |
| Sparkling Stud Ltd | Horsham | 2013 |
| Sparkling-Poochez Limited | Stourport-On-Severn | 2021 |
| Sparks Farm (Essex) Ltd | Braintree | 2024 |
| Sparling Agronomy Services Limited | Market Rasen | 2004 |
| Sparnham Fields Ashburton Company Limited | Newton Abbot | 2010 |
| Sparr Farm Ltd | Billingshurst | 2026 |
| Sparrow Farms Limited | Shrewsbury | 2026 |
| Sparrowbush Livery Ltd | Dorchester | 2025 |
| Sparrowbush Properties Limited | Dorchester | 2008 |
| Sparrows Hill Livery Limited | Saffron Walden | 1997 |
| Sparrow’S Yacht Service Limited | Ventnor | 2026 |
| Sparsholt Wines Limited | Winchester | 2022 |
| SPC UK Services Ltd | Louth | 2021 |
| SPD Logs Ltd | Reading | 2024 |
| SPE Fishing Limited | Bagillt | 2021 |
| Spear Livery Ltd | London | 2019 |
| Spearhead Marketing Limited | Ely | 1999 |
| Spearhead Turf Limited | Kettering | 1986 |
| Special Branch Tree Services Limited | Neath | 2024 |
| Special Branch Tree Services NE Ltd | Durham | 2022 |
| Special Branch Utilities Limited | Powys | 2005 |
| Special G Ltd | Cupar | 2026 |
| Specialised Drone Services Limited | York | 2024 |
| Specialised Groundcare Ltd | Loughborough | 2004 |
| Specialised Pigs Limited | Farnham | 2011 |
| Specialist Farm Enterprises Limited | Market Drayton | 2010 |
| Specialist Tree Care Limited | Wrexham | 2002 |
| Specialist Wildlife Rescue & Rehoming Services CIC | Liskeard | 2026 |
| Specialistexcavationsni Ltd | Armagh | 2025 |
| Speciality Crop Consulting Ltd | Surrey | 2019 |
| Specimen Fishing Tackle Ltd | Bramley Leeds | 2021 |
| Specimen Trees Limited | Knutsford | 2014 |
| Spectrascout Ltd | London | 2026 |
| Spectrum-Tec Ltd | Bakewell | 2026 |
| Speed Farming Limited | Minehead | 2020 |
| Speedwell Ecology Ltd | Bolton | 2025 |
| Speedy Group Services Ltd | Glasgow | 2014 |
| Speirs Farms Limited | Pepperstock Luton | 2003 |
| Spellow Limited | Spilsby | 2013 |
| Spelmonden Estate Co.Limited | Kent | 1959 |
| Spence & Sons Limited | Isle Of Wight | 1961 |
| Spence Farms Limited | Driffield | 2022 |
| Spence Fishing Ltd. | Buckie | 2017 |
| Spencer Wilton Limited | Cheltenham | 2015 |
| Spencer-Carter Limited | Cornwall | 1997 |
| Spennybarn Limited | Richmond | 2014 |
| Spernal Farms Limited | Leamington Spa | 2005 |
| Spey Capital Limited | Edinburgh | 2023 |
| Spey Fishing Trust Limited | Fochabers | 1970 |
| Speycrest Limited | Thwaite St Mary | 1975 |
| Speymouth Limited | Moray | 1998 |
| Speyside Agriculture Ltd | Aberlour | 2021 |
| Speyside Harvesting Limited | Keith | 2003 |
| Speyside Tree Services Ltd | Ballindalloch | 2012 |
| Speywood Limited | Brentwood | 1993 |
| SPF Jigsaw Ltd | Southampton | 2016 |
| SPH Farms Limited | Oldbury | 2023 |
| SPH Fisheries Ltd | Doncaster | 2020 |
| Spiceroute International Limited | Wembley | 2026 |
| Spike Milton Timber Services Limited | Worcester | 2019 |
| Spilman-Penn Limited | Northampton | 2018 |
| Spilsted & Sons Limited | Hayling Island | 2007 |
| Spindicate Limited | Daventry | 2010 |
| Spindle Fuels Ltd | Alton | 2026 |
| Spindrift (Skye) Limited | Isle Of Skye | 2005 |
| Spine-Issimus Limited | Great Chesterford | 1992 |
| Spink Farming Ltd | York | 2013 |
| Spink Farms Limited | London | 2020 |
| Spinningdale Farm (Essex) Limited | Essex. | 1964 |
| Spire Farms Ltd | Grimsby | 2021 |