| SRS Windows Limited | Construction | 2005 |
| SRT Carpentry Ltd | Manufacturing | 2024 |
| SRU Insulation Ltd | Construction | 2015 |
| SSA UK Properties Ltd | Real estate | 2024 |
| Sscf Takeaway Ltd | Hospitality | 2026 |
| Sstg Group Co., Ltd | Wholesale & retail | 2025 |
| Sszee Media Limited | Information & communication | 2016 |
| ST Anns Court Residents (Gillingham) Limited | Households | 2004 |
| ST Augustines (Plots 448-468) Management Company Limited | Households | 2005 |
| ST Margaret's Court (Rainham) Freehold Company Limited | Households | 2024 |
| ST Sports Ltd | Arts & recreation | 2023 |
| ST-AL1 Services Ltd | Construction | 2023 |
| Stack the Stage Ltd | Information & communication | 2026 |
| Stacy Freehold Ltd | Real estate | 2024 |
| Staff Electrical Services and Solutions Ltd | Construction | 2025 |
| Stage Whisperer Ltd | Administrative & support | 2025 |
| Stanford Smith Brickwork Limited | Manufacturing | 2021 |
| Stanley Partners Ltd | Professional & scientific | 2018 |
| Star Care Lodge Limited | Health & social care | 2012 |
| Star EAR Ltd | Professional & scientific | 2025 |
| Star Link Group Limited | Wholesale & retail | 2024 |
| Startrite Homes Limited | Extraterritorial | 1988 |
| Stary Twinkle Limited | Wholesale & retail | 2025 |
| Station Road Garage 1912 Ltd | Wholesale & retail | 2018 |
| Stc-Pro Services Ltd | Administrative & support | 2023 |
| Steadfast Fire Protection Ltd | Construction | 2020 |
| Stedeford Industrial Limited | Manufacturing | 2022 |
| Stedlyn Retreat Management Limited | Households | 2005 |
| Steele Safety Services Ltd | Professional & scientific | 2026 |
| Steelfields Properties Limited | Real estate | 2021 |
| Stefico Limited | Transport & logistics | 2014 |
| Stein and Stag Limited | Real estate | 2025 |
| Stepaun Ltd | Wholesale & retail | 2024 |
| Steph Consultancy Limited | Information & communication | 2014 |
| Stephen James Commercials Limited | Wholesale & retail | 2019 |
| Stephen's Bridge Farm Rental's Ltd | Households | 2025 |
| Steppes Hill Farm Antiques Limited | Wholesale & retail | 2015 |
| Steve FOX Social Work Consultancy Ltd | Health & social care | 2020 |
| Steve MAC Media Limited | Information & communication | 2011 |
| Steven Gull Communications Ltd | Professional & scientific | 2016 |
| STI Line Limited | Manufacturing | 2001 |
| Stkbuilders Ltd | Manufacturing | 2018 |
| STL Scaffolding Ltd | Construction | 2017 |
| Stockwood Meadow Management Limited | Households | 2017 |
| Stone Detail Limited | Construction | 2025 |
| Stone Retail Ltd | Wholesale & retail | 2023 |
| Stonebridge Invest Ltd | Real estate | 2025 |
| Stonecroft Intabuild Limited | Administrative & support | 2010 |
| Stonegrove Retrofit & Infrastructure Limited | Construction | 2024 |
| Stoner Motor Company Ltd | Wholesale & retail | 2012 |
| Stonevale Homes Limited | Construction | 2018 |
| Storage Installation Services Limited | Construction | 2007 |
| Story of My Dress Ltd | Wholesale & retail | 2013 |
| Stour & Avon Magazine Ltd | Information & communication | 2020 |
| Stour View Accountancy Ltd | Professional & scientific | 2014 |
| Stourhill Park Residents Limited | Households | 2000 |
| Stourmouth Property Group Ltd | Real estate | 2022 |
| Stowspace Limited | Transport & logistics | 2025 |
| Strayt Vision Ltd | Wholesale & retail | 2024 |
| Stretcher Limited | Wholesale & retail | 2025 |
| Stride Property Solutions Ltd | Construction | 2026 |
| Strive to BE CIC | Education | 2024 |
| Strong & SON Electrical Contractors Ltd | Construction | 2024 |
| Strong Renewables Ltd | Construction | 2024 |
| Strongbuild and Sons Limited | Construction | 2026 |
| Stronger Together Through Cancer CIC | Health & social care | 2024 |
| STT Ltd | Professional & scientific | 2003 |
| Student House Gillingham Limited | Real estate | 2013 |
| Studio Carey Ltd | Administrative & support | 2025 |
| Studio Chris Simmons Limited | Professional & scientific | 2021 |
| Studio Cutler Limited | Wholesale & retail | 2020 |
| Stunt Action Manikins (S.A.M.) Limited | Administrative & support | 2018 |
| Sturdee CUT Group Ltd | Other services | 2024 |
| Sturdee Cuts Ltd | Other services | 2020 |
| Sturdee Mobilez Ltd | Wholesale & retail | 2025 |
| Sturdee One Ltd | Real estate | 2025 |
| Style Renovations Ltd | Real estate | 2019 |
| SU Xiaozao Co., Ltd | Manufacturing | 2025 |
| Sub-Tax Accounting Services Ltd | Professional & scientific | 2003 |
| Sukh DRY Lining Ltd | Construction | 2019 |
| Sukoshi Restaurants Ltd | Hospitality | 2026 |
| Summer Palace 1688 Ltd | Hospitality | 2024 |
| Summer Palace Kent Ltd | Hospitality | 2026 |
| Summergold Limited | Hospitality | 2023 |
| Summit Engineering Ltd | Professional & scientific | 2021 |
| Summit Landscape Solutions Limited | Administrative & support | 2025 |
| Sun China Industrial Co., Ltd | Professional & scientific | 2016 |
| Sun Global Chemical Limited | Wholesale & retail | 2021 |
| Sundar Rachana Limited | Hospitality | 2017 |
| Sunjay Ltd | Wholesale & retail | 2024 |
| Sunley (Ferrier Close) Residents Limited | Households | 1988 |
| Sunley (Findlay Close) Residents Limited | Households | 1991 |
| Sunley (Goodall Close) Residents Limited | Households | 1984 |
| Sunley (Gregory Close) Residents Limited | Households | 1986 |
| Sunley (High Oaks) Residents Association Limited | Households | 1982 |
| Sunley (Park Wood) Residents Association Limited | Real estate | 1981 |
| Sunlight Development Trust Ltd | Administrative & support | 2006 |
| Sunny Fashion Jewelry Co., Limited | Wholesale & retail | 2022 |
| Sunny Thai Trading Co., Ltd | Wholesale & retail | 2020 |
| Sunpatch Ltd | Information & communication | 2026 |