| Springhead Services Ltd | Professional & scientific | 2021 |
| Springrising Limited | Professional & scientific | 2013 |
| Springwood Gardens Residents Society Limited | Households | 2024 |
| Sprotborough Management Company Limited | Households | 2005 |
| Sprowston Management Company Limited | Households | 2020 |
| Spruce Services Limited | Construction | 2002 |
| Sprucedean Homes Limited | Professional & scientific | 2018 |
| SPS Group Holdings Limited | Financial services | 2021 |
| SPS Painting and Building Contractors Limited | Construction | 1988 |
| SPS Trustees Ltd | Financial services | 2012 |
| Spyda Digital Ltd | Information & communication | 2024 |
| Square Meter Media Limited | Administrative & support | 2013 |
| Square One Developments Limited | Real estate | 2009 |
| Square One Properties Ltd | Real estate | 2015 |
| Square Properties Limited | Real estate | 1990 |
| Squirrels Interiors (Stockbridge) Limited | Professional & scientific | 2012 |
| SR Damp & Timber Surveys Ltd | Professional & scientific | 2024 |
| SR Property Care Ltd | Construction | 2022 |
| SR Publishing Ltd. | Information & communication | 2007 |
| SR Training and Consultancy Ltd | Professional & scientific | 2025 |
| Sruk Computer Consultantz Limited | Information & communication | 2013 |
| SSA Plumbing & Heating Solutions Ltd | Construction | 2026 |
| SSG Defence Ltd | Extraterritorial | 2023 |
| Ssje Asset Management Ltd | Real estate | 2025 |
| Ssje Property Solutions Ltd | Real estate | 2025 |
| Sskt Consultancy Ltd | Professional & scientific | 2021 |
| SSL Integrated Systems Ltd | Administrative & support | 2018 |
| Sspm Holdings Limited | Financial services | 2023 |
| ST Andrew's View Management Company Limited | Hospitality | 1998 |
| ST Andrew's Way (Langford) Management Company Limited | Households | 2020 |
| ST Andrews Ivel Manor Management Company Limited | Households | 2015 |
| ST ANN Street Management Limited | Households | 2023 |
| ST Annes Meadow (Wokingham) Management Company Limited | Households | 2025 |
| ST Asaph Court (9-16) RTM Company Ltd | Households | 2010 |
| ST Augustines Place Herne Bay Management Company Limited | Households | 2022 |
| ST Catherine's Gardens Lowton Management Company Limited | Real estate | 2020 |
| ST Christopher's Boulevard Management Company Limited | Households | 2003 |
| ST Edmund's Management (Salisbury) Limited | Households | 1992 |
| ST Edmunds Gate Management Limited | Households | 2004 |
| ST James Place (Feltham) Residents Company Limited | Households | 2002 |
| ST James Vale (Great Horwood) Management Company Limited | Households | 2019 |
| ST Johns Wood (North Baddesley) Management Company Limited | Households | 2015 |
| ST Leonard Street Limited | Households | 2014 |
| ST Mary's Court (Gillingham) Management Company Ltd. | Households | 2001 |
| ST Mary's Court, Salisbury Ltd | Households | 2011 |
| ST Mary's Hill (Blandford) Management Company Limited | Households | 2021 |
| ST Michael's Developments (Falmouth) Limited | Construction | 2013 |
| ST Oswald’S Place Residents Management Company Limited | Households | 2025 |
| ST Paul Place Estate Limited | Real estate | 2011 |
| ST. Anns Road Block "C" Flat Management Company Limited | Households | 1986 |
| ST. Anns Road Blocks "a" and "B" Flat Management Company Limited | Households | 1986 |
| ST. George's Mansions RTM Company Limited | Households | 2004 |
| ST. Osmund's Pre-School | Education | 2008 |
| ST. Peters Place (Chiswick) Residents Management Company Limited | Households | 2013 |
| Stab Solutions Limited | Wholesale & retail | 2023 |
| Stabe Ltd | Information & communication | 2019 |
| Stack 'M High Limited | Administrative & support | 2003 |
| Stafford Place 2 Management Limited | Households | 2016 |
| STAGE12. Ltd | Public administration | 2023 |
| Stair Pro Ltd | Construction | 2019 |
| Standlynch Barns Management Company Limited | Households | 1998 |
| Standx Ltd | Administrative & support | 2016 |
| Stanford Consultancy Systems Limited | Professional & scientific | 2017 |
| Stanford Livestock International Limited | Transport & logistics | 1987 |
| Stansted Road (Kingswood Place Elsenham) Management Company Limited | Households | 2015 |
| Stanton Euro-Park Limited | Real estate | 1997 |
| Stanton Solutions Limited | Information & communication | 2023 |
| Stapley Construction Services Limited | Construction | 2023 |
| Star Market Foods Ltd | Manufacturing | 2023 |
| Staras Carpentry Ltd | Construction | 2017 |
| Starfall Farm Limited | Administrative & support | 2015 |
| Starlight Essences Limited | Administrative & support | 2006 |
| State Securities Limited | Financial services | 2020 |
| Station Mews (Pewsey) Management Company Limited | Real estate | 2017 |
| Station Road Dunstable Management Company Limited | Households | 2008 |
| Station Road Flat Management Company Ltd | Households | 2005 |
| Staveley Walk Management Company Limited | Households | 2025 |
| Stayup Float Company Limited | Extraterritorial | 2011 |
| Steamology Motion Limited | Manufacturing | 2014 |
| Steartslane Limited | Agriculture & fishing | 1997 |
| Steele Rose 2019 Limited | Professional & scientific | 2010 |
| Steele Rose Law LLP | | 2013 |
| Steele Rose Limited | Professional & scientific | 2019 |
| Steele Rose Trust Corporation Ltd | Professional & scientific | 2013 |
| Steeple and Street CIC | Information & communication | 2020 |
| Stelion Limited | Professional & scientific | 2020 |
| Stella Smith Limited | Professional & scientific | 2011 |
| Stellar Project Services Limited | Professional & scientific | 2021 |
| Stellsykes Ltd | Professional & scientific | 2020 |
| Step (Wiltshire) Limited | Education | 2025 |
| Step Associates Limited | Professional & scientific | 2017 |
| Step Investment Properties Limited | Real estate | 2020 |
| Stephen E. Morris Limited | Information & communication | 2017 |
| Stephen J Linard Limited | Professional & scientific | 2000 |
| Stephenson Research Associates Ltd | Administrative & support | 2003 |
| STEPKAY72 Limited | Professional & scientific | 2017 |
| Sterile Supplies Limited | Administrative & support | 2015 |
| Steve Gordon Artwork Ltd | Arts & recreation | 2021 |
| Steve Griffin (Farriers) Limited | Other services | 2015 |
| Steve Tagg Ltd | Construction | 2016 |