| Rova Labs Ltd | Information & communication | 2026 |
| Royaal Masala Ltd | Hospitality | 2025 |
| RPM Car Care Ltd | Wholesale & retail | 2024 |
| RS Heating & Electrical Ltd | Construction | 2024 |
| Rsal Limited | Real estate | 2019 |
| RSP Projects London Ltd | Construction | 2025 |
| RT Truck Repairs Limited | Wholesale & retail | 2011 |
| RTC Construction Limited | Construction | 2025 |
| RUA Investments Limited | Real estate | 2019 |
| Rubix Contracts Ltd | Construction | 2012 |
| RUN4HUMANITY Ltd | Agriculture & fishing | 2026 |
| Runako Ltd | Other services | 2022 |
| Russell's Property Investments Ltd | Real estate | 2021 |
| S a Team Decorators Limited | Construction | 2019 |
| S Pastusencu Ltd | Construction | 2024 |
| S&D Haulage Services Ltd | Transport & logistics | 2021 |
| S&L Holdings (Southern) Limited | Construction | 2020 |
| S.Debrah Services Ltd | Professional & scientific | 2025 |
| S.J. Barratt (Building & Maintenance) Ltd | Construction | 2023 |
| S2L Generators Limited | Manufacturing | 2023 |
| S2L International Limited | Administrative & support | 2023 |
| S2L Productions Limited | Information & communication | 2023 |
| SA Cladding & Roofing Ltd | Construction | 2018 |
| Safehold Care Ltd | Health & social care | 2026 |
| SAI Maths Academy Ltd | Education | 2017 |
| Salon DES Vignes Ltd | Other services | 2020 |
| SAM Werrett Design Limited | Arts & recreation | 2025 |
| Samber Welding Services Limited | Manufacturing | 2014 |
| Samrajid Limited | Real estate | 2022 |
| Sand & Gravel Direct Limited | Administrative & support | 2008 |
| Sandford Building and Maintenance Ltd | Construction | 2020 |
| Sarjoc Ltd | Real estate | 2019 |
| Sathin Consultancy Ltd | Construction | 2019 |
| Saxon Engineering (Essex) Limited | Construction | 2002 |
| Scar-Lett Properties (Thurrock) Limited | Real estate | 2017 |
| SCL International Limited | Professional & scientific | 2004 |
| Scott Sumpton Racing Ltd | Manufacturing | 2023 |
| Sdat Services Ltd | Transport & logistics | 2025 |
| SDS Door Security Ltd | Manufacturing | 2024 |
| Secret Mears Holdings Limited | Financial services | 2024 |
| Senator Welding & Engineering Supplies Limited | Wholesale & retail | 1992 |
| Senior Care Assist Ltd | Health & social care | 2024 |
| Senor Engineering Company Limited | Manufacturing | 1996 |
| Serenity Garden Services Ltd | Professional & scientific | 2025 |
| Seva SM Ltd | Transport & logistics | 2021 |
| Seva-Star Car Wash Ltd | Wholesale & retail | 2026 |
| SGR Plumbing & Heating Limited | Construction | 2019 |
| Shaders Limited | Wholesale & retail | 2013 |
| Shadow Elite Ltd | Administrative & support | 2011 |
| Shadowland Limited | Professional & scientific | 1997 |
| Shafi Khan UK Limited | Wholesale & retail | 2024 |
| Shardlock Limited | Professional & scientific | 2015 |
| Shasha Care Solutions Ltd | Health & social care | 2012 |
| SHE Rocks Beauty Limited | Other services | 2019 |
| Shelving and Storage Ltd | Construction | 2025 |
| Shene Limited | Information & communication | 2013 |
| Shining Treasure Ltd | Wholesale & retail | 2024 |
| SI6 Associates Ltd | Information & communication | 2020 |
| Sial Group of Companies Ltd | Hospitality | 2024 |
| Simpson Joinery Services Limited | Construction | 2007 |
| Sinergy IT Limited | Information & communication | 2017 |
| Sirrus Computers Ltd | Information & communication | 2015 |
| Site Wide Lifting Limited | Construction | 2017 |
| SJB Financial Limited | Financial services | 2017 |
| SJFITNESS4LIFE Limited | Arts & recreation | 2014 |
| SK Sealants Limited | Construction | 2017 |
| Skylark Vision Ltd | Information & communication | 2017 |
| Skyrise Productions Ltd | Information & communication | 2022 |
| SL Management Systems Ltd | Professional & scientific | 2022 |
| SLB Supplies & Services Ltd | Professional & scientific | 2020 |
| Slickswift Ltd | Information & communication | 2024 |
| Smart ECO-1 Ltd | Extraterritorial | 2024 |
| Smartsavermarketplace Ltd | Wholesale & retail | 2026 |
| Sneddon Properties Ltd | Real estate | 2019 |
| Snowfall Glazing & Carpet Ltd | Construction | 2025 |
| Soif Consult Limited | Professional & scientific | 2025 |
| Sola Fashion Limited | Manufacturing | 2013 |
| Solara Designs Ltd | Construction | 2025 |
| SOLUTION4ALL Limited | Information & communication | 2009 |
| Sonic Assessments Limited | Health & social care | 2019 |
| Sparkling Angels Preschool Ltd | Education | 2011 |
| Specialist Stone Services Limited | Manufacturing | 2025 |
| SPP Building Limited | Construction | 2020 |
| Spring Hill Handling Ltd | Professional & scientific | 2016 |
| Srhr Propco Ltd | Real estate | 2025 |
| Ss&Co Ltd | Wholesale & retail | 2019 |
| ST. David's Care & Support Ltd | Health & social care | 2023 |
| Stanford & Lakeside Cars Ltd | Transport & logistics | 2017 |
| Stanford Coach Works & Mobility Services Ltd | Other services | 1998 |
| Stanford Coach Works Limited | Manufacturing | 2003 |
| Stanford Coachworks (SX) Ltd | Wholesale & retail | 2002 |
| Stanford Court Ltd | Real estate | 2020 |
| Stanford Education & Cultural Association | Education | 2019 |
| Stanford Fellas Ltd | Other services | 2025 |
| Stanford Icon LLP | | 2017 |
| Stanford Properties (SX) Ltd | Real estate | 2020 |
| Stanford Properties Limited | Real estate | 2000 |
| Stansfield Road Management Co Limited | Real estate | 2020 |
| Star Haven Care Homes Ltd | Health & social care | 2025 |
| Star Hub and Services CIC | Health & social care | 2025 |