| Stuart Partners Limited | Exeter | 2012 |
| Stuart Sons & Daughters Ltd | Ty Croes | 2025 |
| Stuart Stud Limited | London | 2025 |
| Stuart Swindell Limited | Derby | 2017 |
| Stuart Taylor Farrier Ltd | Exeter | 2012 |
| Stuart-Antony Chapman Limited | Ripon | 1977 |
| Stubb House Farms Limited | Darlington | 2019 |
| Stubbings Group Limited | Maidenhead | 2003 |
| Stubbings Nursery Limited | Maidenhead | 1999 |
| Stubbs AG Limited | Lynemouth | 2023 |
| Stubbs Farming Limited | Barnard Castle | 1999 |
| Stubbs Hall Farm Limited | Stanmore | 2021 |
| Stubbs Hall Lakes Limited | Doncaster | 2003 |
| Stubbs Partners Limited | Stafford | 2013 |
| Stubbyknowe Limited | Gretna | 2009 |
| Stubley Christmas Tree Farm Ltd | Dronfield | 2026 |
| Stubwood (UK) Limited | Ashbourne | 2010 |
| Stuckey Trading Ltd | Devizes | 2026 |
| Stud Farm Contracting Ltd | Maldon | 2020 |
| Stud LS Ltd | Gerrards Cross | 2023 |
| Stud Management Advisory Ltd | Hunstanton | 2018 |
| Studdah Livestock Ltd | London | 2026 |
| Studene Farms Limited | Hull | 1987 |
| Stump and Grind Limited | Camberley | 2005 |
| Stump Cutters Limited | Hereford | 2016 |
| Stump Master Tree Services Ltd | Waterlooville | 2022 |
| Stump Removal Services Ltd | Coventry | 2019 |
| Stump Removal Yorkshire Limited | York | 2015 |
| Stump Solutions Limited | Taunton | 2011 |
| Stumpbusters (South Wales) Ltd | Dinas Powys | 2002 |
| Stumpbusters Lincolnshire Ltd | Lincoln | 2025 |
| Stumpclear Ltd | Loughborough | 2026 |
| Stumps Away UK Limited | Southport | 2022 |
| Stunt Equestrian Limited | Dorchester | 2018 |
| Sturdee Poultry Farms Limited | Suffolk | 1997 |
| Sturgeon Sanctuary Limited | Bridlington | 2026 |
| Sturmer Farms Limited | Sandwich | 2012 |
| Sturt Farm Limited | Haslemere | 2003 |
| Sturtridge & Sons Fishing Limited | Brixham | 2023 |
| STX Limited | Bury St Edmunds | 2001 |
| STY Lane Woodland Management Company Limited | Bingley | 2008 |
| Styalways Limited | Chatteris | 2015 |
| Stybarrow Kennels Ltd | Llandeilo | 2017 |
| Styche Valley Services Limited | Market Drayton | 2010 |
| Stydd House Equestrian Limited | Ashbourne | 2021 |
| Stygate Farms Limited | Nottingham | 1983 |
| Styles Nurseries Limited | Birmingham | 2024 |
| Stylisticat International Ltd | Glasgow | 2019 |
| Styring & Sons Ltd | Retford | 2013 |
| SUB One Limited | Bristol | 2020 |
| Sub-Flex Ltd | London | 2023 |
| Suber Ltd | Ilfracombe | 2019 |
| Sublime Forestry Ltd | Tain | 2022 |
| Subsea Elite Limited | London | 2016 |
| Subsea Odyssey Limited | Fraserburgh | 2007 |
| Subsea Well Technology Limited | Aberdeenshire | 1992 |
| Succes Clouds Farming Ltd | Cardiff | 2024 |
| Suchnoon Limited | West Sussex | 1981 |
| Suckley Farms Ltd | Oswestry | 2018 |
| Suckley Rednal Limited | Shrewsbury | 2011 |
| Sudbury Farms Limited | Ashbourne | 2007 |
| Suddene Park Ltd | Marlborough | 2016 |
| Suddon Grange Farm Limited | Wincanton | 2019 |
| Sudeley Valley Regenerative Farms Ltd | London | 2021 |
| SUE Cunliffe Limited | Grange-Over-Sands | 2011 |
| Suffolk Apiaries Ltd | Ipswich | 2024 |
| Suffolk Beet Company Ltd | Ipswich | 2019 |
| Suffolk Country Services Ltd | Stowmarket | 2016 |
| Suffolk Fresh Ltd | Wilmslow | 2018 |
| Suffolk Growers Limited | Milton Keynes | 2018 |
| Suffolk Horse Society(The) | Woodbridge | 1891 |
| Suffolk Mushrooms Unlimited | Evesham | 2009 |
| Suffolk Produce Limited | Woodbridge | 2004 |
| Suffolk Straw Limited | Woodbridge | 2020 |
| Suffolk Tree Services Limited | Sudbury | 2002 |
| Suffolk Wine Company Limited | Diss | 2014 |
| Sugar Hill Farm Limited | Clitheroe | 2023 |
| Sugar Loaf Alpacas Ltd | Abergavenny | 2019 |
| Sugarloaf Holdings Ltd | Port Talbot | 2015 |
| Sugden Contractors Limited | Keighley | 2012 |
| Suggitt Farm Services Ltd | Attleborough | 2011 |
| Sugnall Farms Limited | Market Drayton | 2000 |
| Sugrue Hutson Vineyards Limited | Worthing | 2022 |
| Sugrue South Downs Limited | Worthing | 2013 |
| Suhail Company Limited | York | 2020 |
| Suitstack Limited | Thatcham | 1981 |
| Sulby Hall Farm Limited | Corby | 2019 |
| Sulisker Ltd | Banff | 2023 |
| Sullington Manor Farm Limited | Pulborough | 1953 |
| Sulphate Solutions (2003) Ltd | Ellesmere | 2003 |
| Sultan Farms Ltd | Carrickmore | 2019 |
| Sulvie Green Farm Ltd | Hemel Hempstead | 2023 |
| Summer & Winter Services Limited | Ashford | 1996 |
| Summer Cloud Limited | Sandbach | 2023 |
| Summer Foods Co., Ltd | Kenilworth | 2017 |
| Summer Isles Fishing Company Limited | Peterhead | 1994 |
| Summer Lane Woodland East Limited | Bath | 2015 |
| Summer Red Ltd | Bury St Edmunds | 2020 |
| Summer Rose Fishing Company Ltd | Fraserburgh | 2012 |
| Summerfield Stud Ltd | Colchester | 2024 |