| Rock Star Imaging Ltd | Health & social care | 2024 |
| Rockfords Commercial Contractors Limited | Construction | 2009 |
| Rocksun Ltd | Real estate | 2021 |
| Rockway Soft Ltd | Information & communication | 2012 |
| Ronnak Private Ltd | Administrative & support | 2016 |
| Roofstop Ltd | Wholesale & retail | 2023 |
| Roots Healthcare Ltd | Health & social care | 2019 |
| Ropemakers Walk Property Management Limited | Households | 2004 |
| Rosser and Daughters Limited | Extraterritorial | 2020 |
| Rotating Machinery Works Ltd | Mining & quarrying | 2023 |
| Roundhouse Electrical Ltd | Construction | 2021 |
| Royale Grill & Dessert Ltd | Hospitality | 2022 |
| RPW Advisory Ltd | Professional & scientific | 2021 |
| RR Software Services Limited | Information & communication | 2012 |
| RS Digital Ltd | Information & communication | 2006 |
| RSL Heating & Plumbing Ltd | Construction | 2025 |
| RSS Guard Ltd | Administrative & support | 2024 |
| Rtls Communications Limited | Information & communication | 2014 |
| RTP Global Solutions Ltd | Wholesale & retail | 2021 |
| Rujsach Properties Limited | Real estate | 2023 |
| Ruku Investment Ltd | Financial services | 2026 |
| Ryegrass Associates Limited | Information & communication | 2016 |
| S Boyce Consultancy Limited | Professional & scientific | 2024 |
| S D H Services Limited | Construction | 1997 |
| S P Controls and Electrical Limited | Construction | 2023 |
| S&L Studio Ltd | Other services | 2024 |
| S&M Development Projects Ltd | Construction | 2021 |
| S.U.G.I Multiservice Ltd | Other services | 2009 |
| SA Cloud Solutions Limited | Information & communication | 2025 |
| SA West Design and Build Ltd | Construction | 2025 |
| Safe Hand Property Care Ltd | Construction | 2026 |
| Safety by Design Limited | Professional & scientific | 2023 |
| Salestech CRM Limited | Information & communication | 2023 |
| Salt Radio Promotions Ltd | Professional & scientific | 2024 |
| Samasth Holdings Ltd | Real estate | 2024 |
| Samasz UK Ltd | Manufacturing | 2022 |
| Samih Limited | Other services | 2014 |
| Samkit Properties Ltd | Real estate | 2020 |
| Sandown Management Limited | Households | 1981 |
| Sanghera Investments London Limited | Real estate | 2026 |
| Sanjog Publications Limited | Information & communication | 2011 |
| Sankhya Capital Ideas Limited | Professional & scientific | 2020 |
| Sarannah Ltd | Professional & scientific | 2019 |
| Sarvin Limited | Construction | 2024 |
| Savannah Associates Limited | Information & communication | 2024 |
| Savile Rouge Ltd | Information & communication | 2025 |
| Sayes House Limited | Financial services | 2020 |
| SBS Engineering Consultancy Ltd | Professional & scientific | 2022 |
| SC Property Services London Ltd | Construction | 2022 |
| Scaffold Structure Designs UK Ltd | Other services | 2015 |
| Scapino Limited | Arts & recreation | 2018 |
| Scutao Transport Ltd | Wholesale & retail | 2023 |
| Seeview Estates Ltd | Real estate | 2007 |
| Select Airline Management Limited | Transport & logistics | 2004 |
| Selwyn Court Residents Limited | Households | 1996 |
| SER Technologies Limited | Information & communication | 2008 |
| Serra & Speller Cleaning Limited | Administrative & support | 2017 |
| Serviced Accommodation Cleaning Ltd | Administrative & support | 2023 |
| Setareh Solutions Limited | Information & communication | 2018 |
| Shahbaz & Mona Properties Ltd | Real estate | 2020 |
| Sharko Ltd | Construction | 2024 |
| Sharmeen UK Limited | Manufacturing | 2015 |
| Sheild Pest Control Limited | Extraterritorial | 2024 |
| Shelleys (Surrey) Limited | Real estate | 2019 |
| Shepperton Roofing Ltd | Construction | 2024 |
| Sherwood Lock Management Company Limited | Households | 1993 |
| Shine Wise Cleaning Ltd | Administrative & support | 2025 |
| Shinners Properties Ltd | Financial services | 2026 |
| Shiny Penny Ltd | Professional & scientific | 2021 |
| Shipvet Services Ltd | Manufacturing | 2004 |
| Shraam Limited | Information & communication | 2023 |
| Shutterwise Limited | Construction | 2016 |
| Shymala Exim & Retail Ltd | Wholesale & retail | 2025 |
| Signature Wheels Ltd | Wholesale & retail | 2025 |
| Silver Cave Ltd | Wholesale & retail | 2022 |
| Silver FOX Planning Enforcement Consultants Ltd | Professional & scientific | 2021 |
| Silver SOX Limited | Professional & scientific | 2025 |
| Silverpark Developments Ltd | Real estate | 2003 |
| Silverpark Property Developments Ltd | Construction | 2021 |
| Simon Fitchett Limited | Other services | 2010 |
| Simon Merrony Architects Co Limited | Professional & scientific | 2010 |
| Simplified Solutions & Co Ltd | Other services | 2010 |
| Simply Carpe Diem Ltd | Wholesale & retail | 2025 |
| Singh Electricals Refrigeration Service Ltd | Construction | 2026 |
| Singularity Insights Ltd | Information & communication | 2024 |
| Sino-Aluminas Ltd | Wholesale & retail | 2015 |
| SJC Plumbing & Heating Limited | Construction | 2022 |
| SJS Group (Surrey) Ltd | Professional & scientific | 2025 |
| Skwigly Ltd | Information & communication | 2014 |
| Skygoods Limited | Transport & logistics | 2021 |
| Skyline Educational Ltd | Professional & scientific | 2017 |
| Skyteam Shipping Ltd | Transport & logistics | 2022 |
| Slightly Quirky Limited | Professional & scientific | 2006 |
| Slurpy Studios Limited | Professional & scientific | 2010 |
| Smacker Ltd | Information & communication | 2015 |
| Smart Project Construction Ltd. | Construction | 2014 |
| Smash Sports Limited | Wholesale & retail | 2004 |
| SMD Lift Services Limited | Manufacturing | 2020 |
| Smie UK Limited | Manufacturing | 1982 |
| Sohala Limited | Arts & recreation | 2011 |