| Rojeka Ltd | Wholesale & retail | 2019 |
| Ronald W Chivers & Co Ltd | Professional & scientific | 2019 |
| Rondeau Properties Limited | Households | 1999 |
| Rondos Systems Limited | Real estate | 2020 |
| Roofstiles Limited | Construction | 2008 |
| Room 14 Digital Ltd | Information & communication | 2016 |
| Room Adder UK Limited | Real estate | 2008 |
| Root + Bone Limited | Information & communication | 2014 |
| Roots of Hope CIC | Education | 2025 |
| Roots Transport Services Limited | Transport & logistics | 2014 |
| Rose Cottage SPV Ltd | Construction | 2026 |
| Rose Lane (Great Chesterford) Management Company Limited | Households | 2015 |
| Rosendales Heating and Plumbing Ltd | Construction | 2015 |
| Roserne Capital Limited | Financial services | 2015 |
| Rosius Limited | Professional & scientific | 2014 |
| Ross Associates Limited | Information & communication | 2003 |
| Ross Border Investment Ltd | Hospitality | 2019 |
| Roswell Properties Limited | Real estate | 2021 |
| Rowe & Co Resin Bound Surfacing Limited | Construction | 2025 |
| Roxel Limited | Manufacturing | 2018 |
| ROY Barnes Limited | Construction | 2003 |
| Royds Services Limited | Other services | 2001 |
| Rpmgd.Com Ltd | Information & communication | 2018 |
| RQ Sites Limited | Professional & scientific | 1999 |
| RRJ Contractors Ltd | Construction | 2024 |
| RS Drainage Services Limited | Water & waste | 2018 |
| Rs.Tonny Ltd | Construction | 2020 |
| RSH Group UK Ltd | Information & communication | 2025 |
| Rsuconstructions Ltd | Construction | 2026 |
| RT Drainage Solutions Ltd | Water & waste | 2024 |
| Rubix Global Limited | Professional & scientific | 2021 |
| Rudd Electrical Contractors Ltd | Construction | 2018 |
| Rudie Ltd | Information & communication | 2016 |
| Ruffels & Tuckett Limited | Manufacturing | 2010 |
| Run Wild Education Ltd | Education | 2024 |
| Run Wild Music Ltd | Professional & scientific | 2016 |
| Run With the Wild Limited | Administrative & support | 2024 |
| Runsattitude Ltd | Wholesale & retail | 2025 |
| Rural Ground Contracts Limited | Administrative & support | 2023 |
| Rush Green Management Company Limited | Households | 1987 |
| Ruskin Transport Limited | Administrative & support | 2010 |
| Rutherford Briant Recruitment Services Limited | Administrative & support | 2009 |
| Rutland Fish Limited | Hospitality | 2008 |
| RVL Consultants Ltd | Information & communication | 2024 |
| Ryan French Ltd | Professional & scientific | 2021 |
| Ryder Electrical Limited | Construction | 2004 |
| S and L Products Ltd | Wholesale & retail | 2021 |
| S B S Mechanical Ltd | Construction | 2013 |
| S C P Administration Limited | Professional & scientific | 2013 |
| S J Poulton Automotive Consultants Limited | Wholesale & retail | 2017 |
| S J Properties (Taunton) Ltd | Real estate | 2017 |
| S Mead Ltd | Construction | 2020 |
| S S Network Limited | Information & communication | 2008 |
| S Williams Electrical Limited | Manufacturing | 2020 |
| S&S Property and Compliance Services Limited | Households | 2026 |
| S'More Adventures Ltd | Extraterritorial | 2023 |
| S.G.Ratcliff Limited | Agriculture & fishing | 1954 |
| S.Gulliford OIL Boiler Services Ltd | Construction | 2011 |
| S.J. Trippett Limited | Real estate | 1994 |
| S.M. Contractors (Essex) Limited | Construction | 2012 |
| S2 Electrical Ltd | Construction | 2009 |
| Saddlebrook Highcroft Ltd | Real estate | 2012 |
| Safe Healthcare and Education Consulting Limited | Administrative & support | 2018 |
| Safeclean Chigwell Ltd | Other services | 2017 |
| Safety Power and Lighting Ltd | Construction | 2018 |
| Safran Aerosystems Services UK Limited | Other services | 2005 |
| Saglam Turkish Barbers Limited | Other services | 2019 |
| Saira Ophthalmic Services Limited | Health & social care | 2021 |
| Saker Contracting Ltd | Agriculture & fishing | 2018 |
| Salestech.Investments Ltd | Financial services | 2025 |
| Salih Property Management Limited | Real estate | 2013 |
| Saling Management Limited | Real estate | 2011 |
| Salix Management Limited | Administrative & support | 2018 |
| Salon Essex Ltd | Other services | 2021 |
| Salore Limited | Administrative & support | 2024 |
| Salt and Honey Swim Ltd | Wholesale & retail | 2025 |
| Salus Management Solutions Limited | Professional & scientific | 2015 |
| SAM Industrial Solutions Limited | Wholesale & retail | 2010 |
| Sam&Heidi Ltd | Administrative & support | 2019 |
| Samadhi Escapes Ltd | Other services | 2022 |
| Sambridge Health Foods Limited | Wholesale & retail | 2003 |
| Same Major Naija Limited | Wholesale & retail | 2017 |
| Samsure Limited | Other services | 2022 |
| Samuel Property Management Ltd | Other services | 2017 |
| Sanderspubco Limited | Hospitality | 2025 |
| Sandy Point Properties Ltd | Real estate | 2024 |
| Sandykiln Limited | Professional & scientific | 2024 |
| SANNI1 Ltd | Health & social care | 2019 |
| Saphire Housing Limited | Administrative & support | 2020 |
| Sarah Douglas Limited | Professional & scientific | 2024 |
| Sarahbee Marketing Limited | Professional & scientific | 2010 |
| Sare Farming Limited | Transport & logistics | 2012 |
| Saro Chauffeurs Ltd | Transport & logistics | 2025 |
| Sarsim Tech Ltd | Information & communication | 2026 |
| Saver Homes Ltd | Energy | 2021 |
| Savill House Management Company Limited | Households | 2019 |
| Saxalinen Ltd | Wholesale & retail | 2024 |
| SB First AID Training Ltd | Education | 2024 |
| SBA Media Ltd | Professional & scientific | 2020 |
| SBE Aesthetics Ltd | Other services | 2023 |