| South West Lakes Limited | Lifton | 2000 |
| South West Lakes Trust | Lifton | 2000 |
| South West Marines (Bristol) Limited | Bristol | 2010 |
| South West Mull and Iona Development | Isle Of Mull | 2014 |
| South West Reindeer Ltd | Yeovil | 2018 |
| South West Serpents Limited | Portland | 2024 |
| South West Shellfish Limited | Penzance | 2022 |
| South West Stump Removal Ltd | Devizes | 2022 |
| South West Trawlers Ltd | Torquay | 2015 |
| South Widcombe Dairy Limited | Bristol | 2010 |
| South Wold Kennels Ltd | Horncastle | 2024 |
| South Wootton Estate Limited | Essex | 2006 |
| South Yorkshire Pest Control Limited | Rotherham | 2017 |
| South Yorkshire Tree Services Ltd | Doncaster | 2021 |
| Southacres Ltd | Darlington | 2018 |
| Southannan Properties Limited | Largs | 1972 |
| Southbank Vineyard Ltd | Billericay | 2023 |
| Southbower Limited | Devon | 2004 |
| Southcoast Seafoods Ltd | Poole | 2020 |
| Southcoast Seaweed Ltd | Southsea | 2021 |
| Southcott Racing Limited | Letchworth Garden City | 1964 |
| Southcourt Stud Company Limited | London | 1995 |
| Southdown Apiaries Ltd | Kingston Upon Thames | 2023 |
| Southdown Farming Ltd | Henfield | 2026 |
| Southdown Sheep Society(The) | Halesworth | 1892 |
| Southdowns Botanicals Limited | Halnaker | 2021 |
| Southdowns Environmental Pest Solutions Ltd. | Waterlooville | 2019 |
| Southdowns Flyfishing CIC | Henfield | 2025 |
| Southeast Tree Care Limited | Wallington | 2014 |
| Southend Woods Limited | Glasgow | 1998 |
| Southern Aerial Enterprises Ltd | London | 2024 |
| Southern Agri Ltd | Taunton | 2025 |
| Southern Arboriculture Ltd | Fareham | 2019 |
| Southern Beeches Limited | Henfield | 2001 |
| Southern Breeze E111 Limited | Exmouth | 2026 |
| Southern Counties Auctioneers Limited | Salisbury | 1990 |
| Southern Counties Farming Ltd | Farnham | 2026 |
| Southern Counties Forestry Ltd | Salisbury | 2015 |
| Southern Counties Liming Limited | Arundel | 2011 |
| Southern England Farms Limited | Hayle | 1996 |
| Southern England Wines (UK) Ltd | Worthing | 2016 |
| Southern Farmers Limited | Cranbrook | 2000 |
| Southern Farms & Forestry Ltd | Cranbrook | 2013 |
| Southern Forest & ARB Limited | Looe | 2019 |
| Southern Granary Services Limited | Winchester | 2003 |
| Southern HAY and Straw Co Limited | Salisbury | 2018 |
| Southern Horticulture Limited | Ringwood | 2013 |
| Southern Organic Farms Ltd | London | 2025 |
| Southern Partridges Limited | Barnstaple | 1979 |
| Southern Pitts Dairy Ltd | Milford Haven | 2014 |
| Southern Pitts Holdings Ltd | Kilgetty | 2025 |
| Southern Plant & Renewables Limited | Ringwood | 2023 |
| Southern Roots Organics Ltd | Cardigan | 2017 |
| Southern Sands Alpacas Limited | Crewkerne | 2020 |
| Southern Slurry Limited | Lingfield | 2015 |
| Southern Spirit E333 Limited | Exmouth | 2026 |
| Southern Tree Care Limited | Salisbury | 2018 |
| Southern Tree Services Limited | Newton Abbot | 2003 |
| Southern Tree Specialists Limited | Bournemouth | 2013 |
| Southern Waterscapes Ltd. | Fordingbridge | 2016 |
| Southern Woodland Products Limited | Hampshire | 2005 |
| Southery Farms Limited | Tewkesbury | 1943 |
| Southfarm Stables Ltd | Tunbridge Wells | 2026 |
| Southfield Agronomy Limited | Driffield | 2009 |
| Southfield Livestock Limited | Bicester | 2021 |
| Southfield PIG Farms (Flixton) Limited | Scarborough | 1962 |
| Southfields Farm Limited | Birmingham | 1959 |
| Southgate Agriculture Limited | Colchester | 2020 |
| Southill Stud Ltd | Tiverton | 2024 |
| Southlake Angling Society | Wokingham | 2010 |
| Southleaze Xmas Trees Limited | Swindon | 2003 |
| Southmoor Farm Limited | Crediton | 2003 |
| Southmoor Livery NO 2 Limited | Sedgefield | 2024 |
| Southmoor Livery NO1 Limited | Sedgefield | 2024 |
| Southport FLY Fishers Limited | Ormskirk | 2023 |
| Southport Land and Property Co.Limited | Wigan | 1988 |
| Southrop Farm (1994) Limited | Cirencester | 1994 |
| Southside Tree Care Ltd | Renfrew | 2024 |
| Southstreet Farmers Limited | Carmarthen | 1998 |
| Southtown Farm Ltd | Wells | 2012 |
| Southview Salads Limited | Roydon | 2010 |
| Southwalescattys Limited | Merthyr Tudful | 2026 |
| Southwest ISO Systems Ltd | Newton Abbot | 2017 |
| Southwest Seafoods Limited | Cattedown Road, Plymouth | 2002 |
| Southwick Forestry Limited | Fareham | 2013 |
| Southwick Vineyards Ltd | Fareham | 2026 |
| Southwood Farmshop & Nursery Limited | Hull | 2005 |
| Sovereign Forestry Contractors Limited | Cranbrook | 2013 |
| Sovereign K9 Limited | Smethwick | 2017 |
| Sovereign Land Limited | Sheffield | 2018 |
| Sovereign Oceans Ltd | Aberdeen | 2025 |
| Sovereign Property Trust Limited | Sheffield | 1987 |
| Sovereign Turf Limited | Woodbridge | 1993 |
| SOVEREIGN11425 Limited | Dartford | 2025 |
| Sovex Developments Limited | Faversham | 1986 |
| SOW Successful Limited | Stowmarket | 2020 |
| Sowcar Farm Ltd | Macclesfield | 2024 |
| Sowdens Farm Contracting Limited | Crediton | 2016 |
| Sowdens Farm Limited | Crediton | 2004 |
| Sower Hill Stables Limited | Faringdon | 2014 |