| Starlet Enterprise 719 Ltd | Hospitality | 2022 |
| Starlings Support CIC | Other services | 2018 |
| Start UP Fulfilment Ltd | Administrative & support | 2024 |
| Stayonsite Limited | Construction | 2025 |
| STEP4WARD Services UK Limited | Health & social care | 2012 |
| Sterling Estates Ltd | Real estate | 2022 |
| Steve Johnson Properties Limited | Real estate | 2024 |
| Steven Court Residents Association Limited | Households | 2011 |
| Stewarts Ramsgate Limited | Hospitality | 2025 |
| Stickerr Ltd | Manufacturing | 2023 |
| Stock Peddler Ltd | Extraterritorial | 2024 |
| Stokes Bros Thanet Ltd | Wholesale & retail | 2021 |
| Stonaco Fabrications Limited | Manufacturing | 1977 |
| Stone Bay Court Limited | Households | 2005 |
| Stonelees Limited | Arts & recreation | 2000 |
| Storageasy Limited | Administrative & support | 2023 |
| Storm Hotels Limited | Real estate | 2015 |
| Storm Land and Estates (I) Limited | Households | 2008 |
| Stour & Wantsum Ltd | Professional & scientific | 2024 |
| Straight UP Grizzly Productions Limited | Information & communication | 2016 |
| Strandscience Ltd | Manufacturing | 2025 |
| Strategic Cyber Ltd | Professional & scientific | 2024 |
| Strategic Journeys and Goals Limited | Professional & scientific | 2016 |
| Strategicai Partners Ltd | Professional & scientific | 2023 |
| Stream Property Group Ltd | Real estate | 2022 |
| Streete Court Residents Association Limited | Extraterritorial | 1983 |
| Streetforce Limited | Administrative & support | 2011 |
| Streetpharma Ltd | Wholesale & retail | 2020 |
| Streetsense Limited | Education | 2005 |
| Strokes Adventure Golf Ltd | Arts & recreation | 2017 |
| STS Mechanical Engineering Ltd | Manufacturing | 2017 |
| Studio Lindberg Limited | Health & social care | 2004 |
| Studio Molga Ltd | Professional & scientific | 2018 |
| Studio SAM Causer Ltd. | Professional & scientific | 2016 |
| Studio Swine Design Ltd | Professional & scientific | 2014 |
| Style Loft Conversions Limited | Manufacturing | 2025 |
| Successful Outcome Solutions Limited | Administrative & support | 2005 |
| Succurro Consultancy Ltd | Professional & scientific | 2021 |
| Sudobricks Limited | Information & communication | 2021 |
| Suitable Homes Ltd | Real estate | 2026 |
| Sunley (Alkham Close) Residents Limited | Households | 2014 |
| Sunley (Waltham) Residents Association Ltd. | Households | 2015 |
| Sunset Cruise News Limited | Information & communication | 2025 |
| Sunshine Moonshine Limited | Wholesale & retail | 2011 |
| Sunway Services Limited | Real estate | 1998 |
| Superior Shopfitting Limited | Construction | 1966 |
| Supunya Limited | Wholesale & retail | 2008 |
| Surface Scan Ltd | Manufacturing | 2023 |
| Surface Solutions S.E Ltd. | Administrative & support | 2017 |
| Surface Visual Limited | Professional & scientific | 2012 |
| Surfacing Utilities Ltd | Construction | 2014 |
| Sussex Mansions Management Limited | Households | 2010 |
| Sustain Foods Limited | Administrative & support | 2014 |
| Sustainable Path Ltd | Professional & scientific | 2021 |
| Sutcliffe Media Ltd | Construction | 2019 |
| Swansea County & Western Properties Limited | Construction | 1962 |
| Switch Stream Limited | Information & communication | 2018 |
| Sworder Investments Ltd | Financial services | 2026 |
| Syds Shack Ltd | Hospitality | 2025 |
| Sylph Productions Limited | Information & communication | 2013 |
| Sylvester FIC Limited | Financial services | 2024 |
| Syndicate Fire Protection Service Ltd | Construction | 2020 |
| Synergy Design & Control Limited | Construction | 2016 |
| Synergy EV & Electrical Limited | Construction | 2025 |
| Syntra Consultancy Limited | Professional & scientific | 2025 |
| Syntra Properties Limited | Real estate | 2025 |
| T & C Catering Services Ltd | Hospitality | 2023 |
| T F a Fuel Services Ltd | Wholesale & retail | 2001 |
| T.R & C. Carpenters Holding Limited | Real estate | 2023 |
| T.R & C. Carpenters Limited | Wholesale & retail | 2023 |
| T50 Boxing & Fitness Academy C.I.C. | Arts & recreation | 2025 |
| T9 Nutrition Ltd | Manufacturing | 2019 |
| Takaloo Holdings Limited | Financial services | 2019 |
| Take Away Kebab Ltd | Hospitality | 2023 |
| Talent SJC Ltd | Professional & scientific | 2015 |
| Talking FLY Ltd | Information & communication | 2025 |
| Tall Building Fire Safety Network Ltd | Professional & scientific | 2014 |
| Tall Management Limited | Financial services | 2020 |
| Talvin Ltd | Construction | 2025 |
| Tania's Ice Cream Ltd | Manufacturing | 2026 |
| Tantardini Holdings Limited | Real estate | 2018 |
| Tantardini Properties Ltd | Real estate | 2021 |
| Tarek Metwally Limited | Health & social care | 2023 |
| Tasdemir Global Commerce Ltd | Wholesale & retail | 2026 |
| Tatton Property Services Ltd | Real estate | 2020 |
| TC Ramsgate Limited | Hospitality | 2019 |
| TCR Group Ltd | Construction | 2018 |
| Tech Limited | Administrative & support | 1978 |
| Technical Scaffolding Services Limited | | 2015 |
| Technitrack Ltd | Construction | 2008 |
| Teleradio Expert Service Limited | Other services | 2007 |
| Tenley Properties Limited | Construction | 2013 |
| TEP Investments Limited | Real estate | 2020 |
| Teri-Jo Rattigan Property Ltd | Real estate | 2025 |
| Terrakore Ltd | Wholesale & retail | 2019 |
| Tetra Zebra Ltd | Manufacturing | 2023 |
| TGC Building Services Limited | Construction | 2024 |
| TGH (Kent) Ltd | Wholesale & retail | 2021 |
| Thanet Athletics Club CIC | Arts & recreation | 2024 |
| Thanet Auto Works Ltd | Wholesale & retail | 2026 |