| Ridgeway Auto Services Limited | Other services | 1986 |
| Ridgley's Ltd | Construction | 2004 |
| Ringsmere Limited | Real estate | 2016 |
| Rivearts Ltd | Transport & logistics | 2021 |
| Riverhouse Management Limited | Households | 2021 |
| Riverside Fish Bar Ltd | Hospitality | 2011 |
| RLM Connect Ltd | Wholesale & retail | 2013 |
| RMW Estates Limited | Real estate | 2014 |
| ROB Austin Racing Limited | Financial services | 2013 |
| ROB Kirk Services Limited | Transport & logistics | 2012 |
| Rock Plumbing and Heating Ltd | Construction | 2020 |
| Rodford Consultants Limited | Professional & scientific | 2022 |
| Rodford Estates Limited | Real estate | 2026 |
| Rollerxpress CIC | Arts & recreation | 2026 |
| Roly Poly Ltd | Hospitality | 2013 |
| RON Dadge Limited | Extraterritorial | 2021 |
| Rondo School Travel Ltd | Administrative & support | 2000 |
| Rondo Travel Group Limited | Financial services | 2026 |
| Rondo Travel Limited | Administrative & support | 1994 |
| Ronit UK Holdings Limited | Transport & logistics | 2022 |
| Ross Power Solutions Limited | Administrative & support | 2013 |
| Rossmacall Ltd | Wholesale & retail | 2022 |
| Rosy Lusted Beauty Limited | Other services | 2014 |
| Rowlands Renovations Limited | Construction | 2021 |
| Rpel Holdings Limited | Financial services | 2021 |
| RSG Fitness Club Ltd | Arts & recreation | 2025 |
| Rubix Arts and Wellbeing C.I.C. | Arts & recreation | 2024 |
| Ruggeus Ltd | Transport & logistics | 2019 |
| Rural Land Holdings Limited | Real estate | 2023 |
| Rusty’S Kitchen Co. Ltd | Hospitality | 2025 |
| Ryders Contractors Ltd | Construction | 2020 |
| Ryndo Trans Ltd | Transport & logistics | 2022 |
| S & T Services Ltd | Manufacturing | 2001 |
| S J Crabtree (Farms) Limited | Agriculture & fishing | 2018 |
| S. Thrush Ltd. | Health & social care | 2010 |
| SA Academic Limited | Education | 2026 |
| Sadsong Ltd | Transport & logistics | 2020 |
| Saethema Ltd | Administrative & support | 2019 |
| Sailes Marketing Limited | Manufacturing | 2000 |
| Salvation Securities Ltd | Construction | 2017 |
| SAM Daffin Motor Repairs Limited | Wholesale & retail | 2024 |
| SAM Turner Dressage Ltd | Arts & recreation | 2008 |
| Sammbeth Ltd | Financial services | 2018 |
| Sandcastle Books Limited | Information & communication | 2005 |
| Sarahs PA Assistance Limited | Other services | 2017 |
| SAT Exterior Cleaning Services Ltd | Administrative & support | 2026 |
| Saunders Rental Limited | Real estate | 2025 |
| SB Trailer Services Ltd | Manufacturing | 2024 |
| Scaleddrape Ltd | Hospitality | 2019 |
| Schloetter Company Limited | Manufacturing | 1969 |
| Scientist Technologies Ltd | Information & communication | 2022 |
| Scott Jameson Ltd | Professional & scientific | 2021 |
| Sealtech Global Ltd | Wholesale & retail | 2026 |
| Seascapes (Sandbanks) Management Limited | Real estate | 2002 |
| Season Infinity Limited | Wholesale & retail | 2023 |
| Self UN Limited | Professional & scientific | 2014 |
| Selva Developments Ltd | Construction | 2019 |
| Senso Group Limited | Manufacturing | 2024 |
| Senthath Ltd | Hospitality | 2019 |
| Services Management Limited | Professional & scientific | 2026 |
| SES Independent Auditing Limited | Professional & scientific | 2025 |
| Seven Steps Consultancy Ltd | Professional & scientific | 2025 |
| SF Roofing & Building Ltd | Construction | 2025 |
| Sharnthioux Ltd | Construction | 2023 |
| Sharp Alarms Limited | Extraterritorial | 2014 |
| Sheftym Ltd | Wholesale & retail | 2023 |
| Shelley Building and Contracting Limited | Construction | 2021 |
| Sheppey Corner Management Company Limited | Households | 2018 |
| Shilbottle Ltd | Administrative & support | 2022 |
| Sidaway Technologies Ltd | Information & communication | 2015 |
| Sidedynamo Ltd | Transport & logistics | 2019 |
| Sienna Glass Ltd | Wholesale & retail | 2014 |
| Simon a Stephenson Limited | Professional & scientific | 2005 |
| Simon Watts Joinery Limited | Construction | 2009 |
| Simple Paye Ltd | Professional & scientific | 2019 |
| SIP Coffee House Limited | Hospitality | 2019 |
| Sitjaiyai Muay Thai Gym Ltd | Arts & recreation | 2025 |
| SJB Construction Consultancy Ltd | Construction | 2010 |
| SJC Automation Ltd | Professional & scientific | 2014 |
| SJM IT Limited | Information & communication | 2016 |
| SJR Homes Ltd | Real estate | 2024 |
| Skippy Skip Hire & Recycling Ltd | Water & waste | 2009 |
| Skyblue Roofing Services Ltd | Construction | 2026 |
| Skyline Roofs Midlands Limited | Wholesale & retail | 2025 |
| Skywave Communications Limited | Information & communication | 2015 |
| Slater & Jones Building Contractors Limited | Construction | 2018 |
| Slegg Healthcare Ltd | Health & social care | 2023 |
| Smith CNC Solutions Limited | Extraterritorial | 2013 |
| Smith Wadley Homes Limited | Real estate | 1987 |
| Smudgeoff Cleaning Services Ltd | Administrative & support | 2015 |
| SO YOU Want to BE Limited | Administrative & support | 2008 |
| Sojam Ltd | Administrative & support | 2024 |
| Solinsim Ltd | Health & social care | 2021 |
| Solliapara Ltd | Transport & logistics | 2019 |
| Sonning EYE Ltd | Transport & logistics | 2021 |
| Sonning Ltd | Administrative & support | 2022 |
| SOS Science of Skin Ltd | Administrative & support | 2019 |
| Soulware Ltd | Wholesale & retail | 2019 |
| Sound School Ltd | Education | 2024 |
| South Mimms Ltd | Administrative & support | 2021 |