| Southside (Witham) Management Company Limited | Households | 2004 |
| Sovereign Court (ST Neots) Management Company Limited | Households | 2013 |
| Spaceenlightenment Ltd | Wholesale & retail | 2024 |
| Spencers Court (EA) Management Company Limited | Households | 2007 |
| Spherical Engineering Ltd | Professional & scientific | 2019 |
| Spicey Reformer Pilates Studio Ltd | Arts & recreation | 2025 |
| Spine Sports Limited | Professional & scientific | 2026 |
| Spirulena Limited | Information & communication | 2022 |
| SPN Design Limited | Professional & scientific | 2022 |
| Sports Ninjas Ltd | Education | 2026 |
| Spowart Holdings Ltd | Financial services | 2025 |
| Spray Monkey Ltd | Wholesale & retail | 2020 |
| Spring Meadows (Darwen) Management Company Limited | Households | 2020 |
| Spring Thyme (Littleborough) Management Company Limited | Households | 2005 |
| Spring Valley Care Ltd | Administrative & support | 2024 |
| Springfield Secretaries Limited | Administrative & support | 2000 |
| Springwell Court (Stanstead Abbots) Management Company Limited | Households | 2001 |
| Sprk Asset Holdings Limited | Real estate | 2024 |
| Sprout Holdings Limited | Financial services | 2025 |
| SPW Sweets Limited | Wholesale & retail | 2011 |
| Squires Court Residents Association Limited | Households | 1988 |
| Squirrel Wood (Basingstoke) Management Company Limited | Households | 2018 |
| SSJ Building Services Limited | Manufacturing | 2023 |
| SSS Education Ltd | Education | 2019 |
| Sstp Ltd | Real estate | 2025 |
| ST Aidan's Place Management Company Limited | Extraterritorial | 2014 |
| ST Edmunds Walk Management Company Limited | Real estate | 2004 |
| ST Felix Park (Soham) Management Company Limited | Households | 2005 |
| ST James (Hoole Lane) Management Company Limited | Households | 2001 |
| ST James Place Management Company Limited | Households | 2004 |
| ST Lukes (the Quarter) Management Company Limited | Households | 2002 |
| ST Margarets (East Grinstead) Management Company Limited | Households | 2014 |
| ST Mary's Courtyard (Hulme 4) Management Company Three Limited | Households | 1998 |
| ST Michaels Court (Sunderland) Management Company Limited | Households | 2004 |
| ST Petersfields Management Company Limited | Households | 2018 |
| ST Stephens Church Management Company Limited | Households | 2017 |
| ST Thomas Lawns (NO.2) Management Company Limited | Households | 2004 |
| ST Valentines Management Ltd | Households | 2013 |
| ST. Anne's Mews (Newcastle) Management Company Limited | Households | 1993 |
| ST. Francis House Management Company Limited | Households | 2002 |
| ST. Georges Place (Islington) Management Company Limited | Households | 1991 |
| ST. Johns Court (Maylandsea) Management Company Limited | Households | 1990 |
| ST. Marys Gardens (Hall Road) Management Company Limited | Households | 2006 |
| ST. Peters Park (Wallsend) Management Company Limited | Households | 2003 |
| ST. Stephens Court (Maylandsea) Management Company Limited | Households | 1990 |
| Staff Solutions UK Limited | Administrative & support | 2008 |
| Stafford House (Broxbourne) Freehold Company Limited | Real estate | 2008 |
| Stafford House (Broxbourne) Management Co. Limited | Households | 1983 |
| Stagefive Limited | Administrative & support | 2023 |
| Staiths (Phase 3) Management Company Limited | Households | 2006 |
| Staley Hall (Stalybridge) Management Company Limited | Households | 2012 |
| Stamford Gardens (Uffington) Management Company Limited | Households | 2021 |
| Stamford UK Land Limited | Real estate | 2020 |
| Stamp Check Limited | Information & communication | 2016 |
| Stamp Expert Limited | Information & communication | 2025 |
| Stan Construct Ltd | Construction | 2016 |
| Stan Properties Limited | Real estate | 2017 |
| Stanford Property Investments Ltd | Real estate | 2021 |
| Stanley Bridge Cycles and Sports Limited(The) | Wholesale & retail | 1936 |
| Stanley Mews Management Company (Andover) Limited | Households | 2006 |
| Stanstead Store Ltd | Wholesale & retail | 2020 |
| Stansted IT Consultancy Ltd | Information & communication | 2017 |
| Starbright Development Limited | Construction | 2009 |
| Starbright Residential Limited | Real estate | 2014 |
| Stars International Connect Ltd | Professional & scientific | 2024 |
| Startmark Commerce Ltd | Wholesale & retail | 2024 |
| Starwell Properties Ltd | Real estate | 2026 |
| Station Road (Bletchingdon) Management Company Limited | Households | 2015 |
| Station Road (Gamlingay) Management Company Limited | Households | 2013 |
| Station Road (Heckmondwike) Management Company Limited | Households | 2006 |
| Station Road (Keadby) Management Company Limited | Households | 2003 |
| Stationers Place Development Management Company Limited | Households | 2005 |
| Stay Holdings Ltd | Financial services | 2021 |
| Ste-Vans Removal Services Ltd | Transport & logistics | 2025 |
| Steenberg’S Yard Management Company Limited | Real estate | 2020 |
| Steeple Claydon Management Company Limited | Households | 2020 |
| Stella Residences Limited | Financial services | 2020 |
| Stellar Opps Ltd | Real estate | 2021 |
| Stem Solutions Group Ltd | Administrative & support | 2020 |
| Steps Treatment Services Ltd | Other services | 2018 |
| Steve's Ices Essex Ltd | Wholesale & retail | 2018 |
| Stevenage Auto Repair Centre Ltd | Other services | 2011 |
| Stevens Close Limited | Real estate | 2021 |
| Stevens Close Management Company Limited | Households | 2022 |
| Stewart & Stewart Design Limited | Professional & scientific | 2016 |
| Stock Breeders Meat Company,Limited(The) | Wholesale & retail | 1912 |
| Stockport Management Limited | Other services | 1993 |
| Stone Brook (Standish) Management Company Limited | Households | 2015 |
| Stonebridge Fold (Longridge) Management Company Limited | Households | 2020 |
| Stonegarth Management Company Limited | Households | 2004 |
| Stoneleigh View (Kenilworth) Management Company Limited | Real estate | 2023 |
| Stonemead (Stalybridge) Management Company Limited | Households | 2002 |
| Stop Stalling Automatic Driving School Ltd | Education | 2023 |
| Story Story Ltd | Professional & scientific | 2011 |
| Strada Car and Commercial Limited | Transport & logistics | 2011 |
| Straight Frame Limited | Manufacturing | 2026 |
| Straight Grain Limited | Real estate | 1996 |
| Straight UP Snacks Ltd | Hospitality | 2020 |
| Strategic Risk International Limited | Administrative & support | 1995 |
| Stre Construction Limited | Construction | 2026 |