| Ronanda Limited | Health & social care | 2010 |
| Root Journey Ltd | Wholesale & retail | 2024 |
| Rosa Wellness Centre Ltd | Health & social care | 2025 |
| Rose Elliott Ltd | Real estate | 2024 |
| Rossco Design Limited | Professional & scientific | 2024 |
| Rough Common Pre-School Limited | Education | 2014 |
| Rowenco Limited | Professional & scientific | 2008 |
| Roxana Developments Limited | Administrative & support | 2012 |
| Royale Digital Design Ltd | Professional & scientific | 2024 |
| Royds Accountancy Ltd | Professional & scientific | 2008 |
| Rpcb Electrical Ltd | Construction | 2023 |
| RS Revived Ltd | Wholesale & retail | 2024 |
| RT Corporation Ltd | Education | 2024 |
| Rubberbandgames Ltd | Information & communication | 2021 |
| Rubytune Limited | Wholesale & retail | 2019 |
| Rulu's Deli & Kitchen & Wine Limited | Hospitality | 2021 |
| Ruppen Education Ltd | Education | 2024 |
| Ruskin Clothing Ltd | Wholesale & retail | 2025 |
| Russ Carpentry Services Ltd | Construction | 2021 |
| Ruth Steel OT Ltd | Health & social care | 2019 |
| RW MOT and Repairs Limited | Wholesale & retail | 2020 |
| Ryan Thomas Podiatry Limited | Health & social care | 2023 |
| Ryno Media Ltd | Professional & scientific | 2026 |
| Ryomatt Carpentry Ltd | Construction | 2023 |
| S & J Cleaning Services (Kent) Ltd | Administrative & support | 2024 |
| S & N Building Developments Ltd | Construction | 2018 |
| S & S Personalisation Ltd | Other services | 2022 |
| S Hare Medical Limited | Health & social care | 2021 |
| S Matthews Plumbing Ltd | Construction | 2024 |
| S R & T Real Estate Limited | Real estate | 2024 |
| S&B Plant Hire Ltd | Administrative & support | 2025 |
| S&S Carter Plumbing and Heating Ltd | Construction | 2020 |
| S.H. Building & Carpentry Limited | Construction | 2003 |
| S.O. Wealth Management (UK) Limited | Financial services | 2009 |
| S2 Martial Arts Academy Ltd | Education | 2022 |
| Sab's Barber Ltd | Other services | 2020 |
| Safe Hands Property Management Ltd | Administrative & support | 2017 |
| Safe Sanctuary Support Services Limited | Health & social care | 2025 |
| Safer Edge Ltd | Professional & scientific | 2019 |
| Sage Installations Ltd | Construction | 2014 |
| Salitta Ltd | Extraterritorial | 2024 |
| Salon Pearl Ltd | Other services | 2022 |
| Salt + Oliv Ltd | Hospitality | 2025 |
| Salt Dog Studios Ltd | Wholesale & retail | 2025 |
| Salthouse Industries Limited | Professional & scientific | 2023 |
| Saltmarsh Limited | Hospitality | 2011 |
| Salvatori Consulting Ltd | Professional & scientific | 2021 |
| Salvatori Wellness Ltd | Hospitality | 2022 |
| SAM Riley Group Limited | Construction | 2016 |
| SAM Russell Consulting Ltd | Administrative & support | 2023 |
| Same Day Spray Ltd | Wholesale & retail | 2023 |
| Samjay Pharma Services Ltd | Health & social care | 2018 |
| Sampford Technologies Ltd | Professional & scientific | 2020 |
| Samphire Group Ltd | Real estate | 2022 |
| Sandwich Barber & Tanning Ltd | Other services | 2026 |
| Sanflower Limited | Extraterritorial | 2023 |
| Sara's Court Limited | Households | 1996 |
| Saraph Limited | Information & communication | 2004 |
| SAT Bulsara Ltd | Arts & recreation | 2010 |
| Saviorgray Consulting Ltd | Professional & scientific | 2024 |
| Savvypeacocks Ltd | Professional & scientific | 2021 |
| Saxon Mews (Iwade 7) Management Limited | Households | 2010 |
| Saxon Place (Iwade) Limited | Households | 2005 |
| Saxon Shore Management Limited | Real estate | 1998 |
| Sayaki Trading Limited | Wholesale & retail | 2016 |
| SB2 Events Ltd | Hospitality | 2025 |
| Scandinavian Touch Ltd | Administrative & support | 2016 |
| Schnitz Haus Ltd | Hospitality | 2026 |
| School of Healing & Growth Ltd | Health & social care | 2020 |
| Scocles Estate Management Company Limited | Households | 2021 |
| Scorpion Cars Ltd | Transport & logistics | 2023 |
| Scott Calvin Limited | Wholesale & retail | 2007 |
| SCT Maintenance Services Limited | Water & waste | 2023 |
| SD Realm Developments Ltd | Wholesale & retail | 2010 |
| SDK Building Services Ltd | Professional & scientific | 2019 |
| Sea Marine Tech Ltd | Professional & scientific | 2021 |
| Sea Street Developments Limited | Construction | 2012 |
| Seasalter Golf Club Limited(The) | Arts & recreation | 1924 |
| Seasalter Limited | Agriculture & fishing | 2023 |
| Seasalter Shellfish (Whitstable) Ltd | Agriculture & fishing | 1986 |
| Second Half Consulting Ltd | Professional & scientific | 2018 |
| Sector Maintenance Limited | Construction | 2012 |
| Seismic Stuff (U.K.) Ltd | Information & communication | 2010 |
| Selina & Co. Limited | Administrative & support | 2018 |
| Semi.Ch.Ip Ltd | Professional & scientific | 2026 |
| Serenity Health & Beauty (Kent) Limited | Health & social care | 2016 |
| SFX Supplies and Hire Ltd | Arts & recreation | 1996 |
| SGX Sensortech China Holdco Limited | Financial services | 2016 |
| SHA RO Limited | Construction | 2013 |
| Shadefall Ltd | Professional & scientific | 2021 |
| Shades Garden Bars Limited | Construction | 2023 |
| Shagor Pata Ltd | Hospitality | 2023 |
| Shapla Tandoori Whitstable Ltd | Hospitality | 2020 |
| Sharp Printing Limited | Manufacturing | 2016 |
| Shawarma Collective Ltd | Hospitality | 2025 |
| Shawarma Events Ltd | Hospitality | 2026 |
| Shiftwithin CIC | Education | 2025 |
| Shikoba Ltd | Real estate | 2021 |
| Shine @Whitstable Ltd | Administrative & support | 2026 |
| Shire House Residents Association Limited | Households | 1992 |