| Shire Oak Court Management Limited | Households | 2002 |
| Shirley's Roadhouse Limited | Hospitality | 2023 |
| Sholden Fields (Deal) Management Limited | Households | 2013 |
| Shoot the Moon Limited | Professional & scientific | 2005 |
| Shotgunn Productions Ltd | Information & communication | 2024 |
| Shrimpton Consulting Limited | Professional & scientific | 2020 |
| Sidewood Management Limited | Households | 2012 |
| Silens Works Limited | Households | 2001 |
| Silk Woods (Ascot) Management Limited | Households | 2013 |
| Silkport International Limited | Other services | 2021 |
| Silverman Advisory LLP | | 2017 |
| Silverton Management Limited | Households | 1988 |
| Silverwood Grange Management Company Limited | Households | 2006 |
| Simply Divine Creations UK Limited | Wholesale & retail | 2022 |
| Simpson Habgood Holdings Ltd | Financial services | 2025 |
| Skipspace Limited | Information & communication | 2023 |
| Skye High Property Group Limited | Households | 2018 |
| SL Habgood Investments Ltd | Financial services | 2025 |
| Smact Limited | Hospitality | 2016 |
| Smart Coolsculpting Ltd | Health & social care | 2018 |
| Smart Pharma Limited | Wholesale & retail | 2025 |
| Smiles (Fish & Chips) Limited | Hospitality | 2003 |
| Snap Finger Click Tabletop Ltd | Wholesale & retail | 2023 |
| SOL Logistics Limited | Transport & logistics | 2014 |
| Solid Estates Limited | Real estate | 2019 |
| Soma House Limited | Other services | 2024 |
| Sonning Golf Club,Limited | Arts & recreation | 1946 |
| SOS Security Systems Ltd | Administrative & support | 2002 |
| Sotto LDN Limited | Wholesale & retail | 2025 |
| South Bucks Senior Care Ltd | Health & social care | 2009 |
| South Lodge (Southbourne) Limited | Households | 1995 |
| Southlands Court Management Company Limited | Households | 1994 |
| Southwood Mews (Farnborough) Management Company Limited | Households | 2021 |
| Spade Oak Farm Management Company Limited | Real estate | 1991 |
| Sparkles Everyday Jewellery Ltd | Manufacturing | 2024 |
| Spitfire Green (Manston) Residents Management Company Limited | Households | 2022 |
| Splash and Sparkle Ltd | Administrative & support | 2017 |
| Sports Life Studios Ltd | Wholesale & retail | 2025 |
| Spring Meadow Rise Management Company Limited | Households | 2018 |
| Spring Rise Care Services Limited | Health & social care | 2017 |
| Springheath Direct Limited | Professional & scientific | 2009 |
| Spurhill Management Company Limited | Households | 1988 |
| Squirrel's Leap (Bournemouth) RTM Limited | Households | 2007 |
| SR Elite IT Consultancy Limited | Information & communication | 2010 |
| ST Dunstans Mews (Canterbury) Management Company Limited | Households | 2003 |
| ST Homes and Developments Limited | Real estate | 2021 |
| ST Johns Place Residential Management Company Limited | Households | 2013 |
| ST Marks House (Bourne END) Ltd | Households | 2021 |
| ST Mary's Park (NO.3) Management Company Limited | Extraterritorial | 2006 |
| ST Peters Quarter (Chertsey) Management Company Limited | Households | 2020 |
| ST. Clements Management Company Limited | Extraterritorial | 2006 |
| ST. James Court (Poole) Limited | Households | 2001 |
| ST. Wulstans Canalside RTM Company Limited | Households | 2009 |
| Stancelink Property Management Limited | Extraterritorial | 1998 |
| Station Apartments Management Limited | Households | 2005 |
| Station Court Management (Bourne END) Limited | Households | 2006 |
| Station House Management Company (Marlow) Limited | Households | 2022 |
| Steel Ductwork Services Ltd | Construction | 2013 |
| Steeple Chase Management Company (Calne) Limited | Extraterritorial | 2011 |
| Stellamar Studio Ltd | Professional & scientific | 2025 |
| Step Together Limited | Health & social care | 2018 |
| Stephen Hill Bathrooms and Kitchens Ltd | Construction | 2014 |
| Sterling Grove Accountants Limited | Professional & scientific | 2015 |
| Steve Whapshott Ltd | Arts & recreation | 2013 |
| STG Close Limited | Hospitality | 2015 |
| Stockham Management Limited | Households | 2015 |
| Stockwell & Bentley Associates Limited | Administrative & support | 2015 |
| Stonehouse Consultants Limited | Construction | 2003 |
| Stonelea 2 2004 Management Company Limited | Households | 2004 |
| Stowe Apartments Management Company Limited | Administrative & support | 2018 |
| Strata Management Company Limited | Households | 2003 |
| Stratfield Court Management Company Limited | Real estate | 1964 |
| Street Style Hub Ltd | Professional & scientific | 2025 |
| Structured Investment Solutions Limited | Professional & scientific | 2012 |
| Studio on TAP Ltd | Extraterritorial | 2025 |
| Suchowierchi Construction Limited | Construction | 2003 |
| Suede Management Company Limited | Households | 2004 |
| Summit Capital Limited | Financial services | 2005 |
| Summit Design Limited | Construction | 1993 |
| Sunleaf Developments Ltd | Wholesale & retail | 2025 |
| Super Print Ltd | Administrative & support | 2007 |
| Surrey Building Equipment Ltd | Construction | 2019 |
| Sustainable Fashion Consulting Ltd | Professional & scientific | 2021 |
| Sutonlane Management Limited | Households | 2015 |
| Swallow View Management Limited | Households | 2005 |
| Swallowfields (Walton-On-Thames) Management Company Limited | Households | 1986 |
| Swan Estate Management Company Limited | Extraterritorial | 1987 |
| Systems Architecture Limited | Information & communication | 1998 |
| T Jones & SON (Contracting) Limited | Administrative & support | 2018 |
| Tahini Shake Ltd | Real estate | 2024 |
| Taiwo SL Ltd | Financial services | 2024 |
| Tamora Limited | Real estate | 2016 |
| Taraprana Ltd | Health & social care | 2024 |
| Tarrants (Property Management) Limited (the) | Households | 1973 |
| Tattershall Residents Company Limited | Households | 2000 |
| Tavishelm Engineering Limited | Manufacturing | 2007 |
| Taylorwoodell Holdings Ltd | Financial services | 2026 |
| TDR Admin Services Ltd | Information & communication | 2024 |
| Tech-People (South) Limited | Administrative & support | 2011 |
| Tech-People Perpetual Solutions Limited | Administrative & support | 2021 |