| Saais Holdings Limited | Other services | 2020 |
| Saddleworth View Management Company Limited | Households | 2019 |
| Saffron Court Management Company Limited | Households | 1985 |
| Sahbaz Properties Ltd | Real estate | 2021 |
| SAI Software Ltd | Information & communication | 2013 |
| Salisbury Road (Hoddesdon) Limited | Real estate | 2015 |
| Salisbury Square Management Company | Households | 2021 |
| Saloni UK Limited | Wholesale & retail | 2002 |
| Salsa Club 205 Ltd | Education | 2023 |
| Salvo Investments Ltd | Real estate | 2020 |
| Samalmond Co Limited | Education | 2014 |
| Samco Solutions Ltd | Wholesale & retail | 2025 |
| Sanctify-Ed Ltd | Wholesale & retail | 2023 |
| Sanctuary Mews Management Limited | Households | 2007 |
| Sand Martins (Nantwich) Management Company Limited | Households | 2007 |
| Sanderling Park (the Altons) Management Company Limited | Households | 2020 |
| Sanderling Park Management Company Limited | Households | 2019 |
| Sandhill Homes SUB Ltd | Real estate | 2024 |
| Sandhurst Gardens (Chorley) Management Company (NO 2) Limited | Households | 2014 |
| Sandhurst Gardens (Chorley) Management Company Limited | Households | 2012 |
| Sandrove Brahams & Associates Limited | Real estate | 2003 |
| Sandrove Brahams Services Limited | Financial services | 2008 |
| Sandstone House (Ebbsfleet) Management Company Limited | Households | 2025 |
| Sandwich Box Cafe Ltd | Hospitality | 2025 |
| Sandy Lane (2) Residents Association Limited | Households | 1990 |
| Sanford Brothers Limited | Wholesale & retail | 1948 |
| Sangdaos Authentic Thai Massage & Spa Ltd | Other services | 2024 |
| Sarah's Simple Cakes Hertfordshire Ltd | Wholesale & retail | 2018 |
| Sardegna NEL Mondo Ltd | Wholesale & retail | 2016 |
| Sarum Court (Winchester) Management Limited | Households | 2003 |
| Sarus Enterprises Ltd | Real estate | 2016 |
| Sashmate Limited | Wholesale & retail | 2024 |
| SAV Projects Limited | Real estate | 2024 |
| Savile Road Management Company (Castleford) Limited | Households | 1990 |
| Saville House Management Company (Southampton) Limited | Households | 1985 |
| SAW Wave Films Limited | Information & communication | 2016 |
| Saxby Park (Wellingborough) Management Company Limited | Households | 2013 |
| Saxon Gate (Crewe) Management Company Ltd | Households | 2015 |
| Saxon Meadows (Market Harborough) Management Company Limited | Households | 2019 |
| Saxon Media Limited | Information & communication | 1999 |
| Saxons Fine Homes Limited | Real estate | 2022 |
| Saxton Management Company Limited | Households | 2007 |
| Sayers Court (Ealing) Management Company Limited | Households | 2011 |
| SB Creativity Limited | Professional & scientific | 2023 |
| SB Property Services Ltd | Administrative & support | 2023 |
| Sb-Architects Limited | Professional & scientific | 2019 |
| Sbgs Limited | Real estate | 2004 |
| SBJ Investments Limited | Wholesale & retail | 2009 |
| SBS Finances Ltd | Professional & scientific | 2019 |
| Sbull T/A Alafaire’S Ltd | Hospitality | 2026 |
| SC Business Solutions Ltd | Administrative & support | 2026 |
| SC Print Management Limited | Manufacturing | 2010 |
| SC Sports Ltd | Education | 2022 |
| Scaffpol Ltd. | Construction | 2014 |
| Scale My Cloud Limited | Information & communication | 2023 |
| Schillaci Investments Ltd | Real estate | 2018 |
| Scholars Court Management Company (Crawley) Limited | Households | 2002 |
| Scholars Gate (S Upon a) Management Company Limited | Households | 2005 |
| Scholars Square Residents Association Limited | Professional & scientific | 2002 |
| Scholars Walk Management Company Limited | Households | 2002 |
| Scholars Walk Phase 2 (Welwyn Garden City) Management Company Limited | Households | 2007 |
| School Lane (Harlow) Management Company Limited | Households | 2012 |
| School of Social Ltd | Information & communication | 2023 |
| Scientific WAX Limited | Information & communication | 2025 |
| Scott Jerrom Limited | Transport & logistics | 2003 |
| SCR Property Hub Limited | Real estate | 2021 |
| Scribe Architects Ltd | Professional & scientific | 2019 |
| SCV Distribution Limited | Wholesale & retail | 1986 |
| SDR Trading Limited | Wholesale & retail | 2024 |
| Seafood at Dawn Limited | Hospitality | 2023 |
| Seahorse Ventures Holdings Limited | Financial services | 2021 |
| Seasonal Trends Limited | Wholesale & retail | 2020 |
| Sebast.Io Limited | Information & communication | 2026 |
| Sebo Management Co. Limited | Households | 2002 |
| Seclab Ltd | Administrative & support | 2019 |
| Secler Trans Ltd | Transport & logistics | 2018 |
| Second Wood Farm Park Management Co Limited | Households | 1997 |
| Secret Glasshouse Limited | Extraterritorial | 2020 |
| Secure Property Solutions Limited | Real estate | 2013 |
| Securepatch Property Management Limited | Households | 1991 |
| Sedge Green Nursery Limited | Agriculture & fishing | 2013 |
| Sedge Green Salads Limited | Agriculture & fishing | 2010 |
| Seek Films Ltd | Information & communication | 2016 |
| Seeking Property Services Limited | Administrative & support | 2019 |
| Seidita London Connect Ltd | Professional & scientific | 2026 |
| Select Service Telecommunications Limited | Information & communication | 2000 |
| Selen Limited | Other services | 2011 |
| Self Seal Belly Bands Limited | Information & communication | 2020 |
| Send Reform England Limited | Information & communication | 2024 |
| Sendia Properties Ltd | Construction | 2022 |
| Senga Flat Management Company Limited | Households | 1982 |
| Senova Cycles Ltd | Wholesale & retail | 2014 |
| Senzo Designs Limited | Professional & scientific | 2026 |
| SET Healthcare Ltd | Administrative & support | 2018 |
| Setbuilduk Limited | Other services | 2014 |
| Seven Tsars Holding Limited | Financial services | 2022 |
| Sevenoaks Management Company (NO.2) Limited | Households | 2009 |
| Severe Clothing Limited | Wholesale & retail | 2023 |
| Sewardstone Road Management Company Limited | Households | 2003 |
| SG Motorhouse Ltd | Wholesale & retail | 2018 |