| Quirky Productions Ltd | Information & communication | 2016 |
| RAW Deal Films Limited | Information & communication | 2017 |
| Realise UK Limited | Professional & scientific | 2005 |
| Remari Creative Limited | Information & communication | 2026 |
| Renewable Project Solutions Ltd | Construction | 2022 |
| Research Selection Limited | Professional & scientific | 1996 |
| REV 27 Consultancy Limited | Information & communication | 2017 |
| Revolutional Electrical Limited | Construction | 2022 |
| Rgsc London Limited | Wholesale & retail | 2017 |
| RH45 Group Ltd | Other services | 2015 |
| RHP Consulting LLP | | 2009 |
| Ridgeguard Roofing Repairs Limited | Construction | 2025 |
| RME Transport Ltd. | Transport & logistics | 2004 |
| RNS Landscaping Services Ltd | Construction | 2017 |
| ROB Davis Waterproofing Solutions Limited | Construction | 2021 |
| Rohan OIL & GAS Consultants Limited | Professional & scientific | 2007 |
| Role Ready Limited | Arts & recreation | 2020 |
| Romans Construction and Paving Limited | Administrative & support | 2022 |
| Romans Construction Limited | Administrative & support | 2018 |
| Roof Repairs & London Roofers Ltd | Construction | 2024 |
| Rori Services Ltd | Administrative & support | 2016 |
| RPT Equipment Ltd | Manufacturing | 2010 |
| RTS Property Services Limited | Information & communication | 2019 |
| Ruby Horse VFX Limited | Information & communication | 2018 |
| RWO (Marine Equipment) Limited | Manufacturing | 1986 |
| Ryley's Roof Repairs Limited | Construction | 2025 |
| S Briggs & Sons Properties Limited | Real estate | 2025 |
| S Briggs Commercial Estates Limited | Real estate | 2026 |
| S Briggs Commercials Limited | Wholesale & retail | 2020 |
| Saltpine Limited | Hospitality | 1990 |
| SAM Laurence Coaching Ltd | Education | 2022 |
| Sanderson Industries Limited | Other services | 2016 |
| Sands Castle Limited | Information & communication | 2025 |
| Saspo Holdings Limited | Other services | 2015 |
| Saywhatyouc Limited | Wholesale & retail | 2014 |
| SD Marketing Limited | Professional & scientific | 2024 |
| Seaswift Products Limited | Wholesale & retail | 1996 |
| See's Property Investments Ltd | Real estate | 2024 |
| SHAHNAZ3 Limited | Financial services | 2022 |
| Shakespeare Film Productions Limited | Information & communication | 2019 |
| Shardeloes Nursery Limited | Real estate | 2025 |
| Sheltek Electrical Services Limited | Construction | 1988 |
| Siavo Holdings Limited | Financial services | 2022 |
| Silver Lining Recruitment Ltd | Other services | 2015 |
| Simply Talent Group Ltd | Administrative & support | 2016 |
| Simpson Music and Education Limited | Education | 2021 |
| SIX Herons Studio Ltd. | Information & communication | 2018 |
| Skabenga Limited | Other services | 2014 |
| SKL Productions Limited | Information & communication | 2024 |
| Skmakeup Limited | Information & communication | 2023 |
| Skyfield Design Ltd | Other services | 2024 |
| Skyhorse-Consulting Limited | Professional & scientific | 2021 |
| SL Consulting (London) Limited | Administrative & support | 2020 |
| Smardles Limited | Other services | 2019 |
| Smashing Props Ltd | Arts & recreation | 2013 |
| Soccer Management International Limited | Arts & recreation | 2022 |
| Something Films Ltd | Information & communication | 2016 |
| Southview Interiors Ltd | Mining & quarrying | 2007 |
| Spindrift Digital Design Ltd | Information & communication | 2017 |
| Stafford Golf Centre Limited | Arts & recreation | 2018 |
| Stems of London Ltd | Wholesale & retail | 2023 |
| Stephens Surveying Limited | Professional & scientific | 2022 |
| Stepping Stones Nursery Amersham Limited | Health & social care | 2025 |
| Stobart Services Limited | Information & communication | 2019 |
| Storyline Ltd | Information & communication | 2024 |
| Strawberry Place Limited | Financial services | 2025 |
| Studio Sevyn Ltd | Information & communication | 2025 |
| Sunny Wave Studio Limited | Information & communication | 2021 |
| Superfly Investments Limited | Real estate | 2025 |
| Surf Engineering Consultants Limited | Mining & quarrying | 2022 |
| Surrey & Middlesex Metal Recycling Limited | Water & waste | 2019 |
| Susan Lightman Limited | Other services | 2024 |
| Swooper Ltd | Other services | 2015 |
| Synergy Aviation Limited | Transport & logistics | 2023 |
| Synergy Flight Centres Limited | Administrative & support | 2016 |
| T a Advisory Limited | Financial services | 2022 |
| T&B Project Management Limited | Construction | 2019 |
| T.T.S. A.G. | | 1976 |
| Taha Old | | 2010 |
| Tango Project Limited | Construction | 2021 |
| TBG (the Belvedere Group) Ltd. | Construction | 2019 |
| TCS Restaurant Ltd | Hospitality | 2024 |
| Terra Virtus UK Limited | Real estate | 2021 |
| THE Garden Room Landscapes Limited | Administrative & support | 2021 |
| THE Gary Smith Partnership Limited | Professional & scientific | 2013 |
| THE House of RYE Limited | Information & communication | 2022 |
| THE Mira Restaurant Limited | Hospitality | 2019 |
| THE Naked UK Group Limited | Financial services | 2022 |
| THE Software Connection Limited | Information & communication | 2012 |
| THE Superscalers | Administrative & support | 2026 |
| THE Virtual Camera Company Limited | Information & communication | 2020 |
| THE Visual Suspects Limited | Information & communication | 2022 |
| THE WAR Horse Memorial C.I.C. | Arts & recreation | 2017 |
| THE Wire RIG Company Limited | Administrative & support | 2014 |
| Theo Demiris Limited | Information & communication | 2022 |
| Tiger Trax Limited | Manufacturing | 1999 |
| Tilt VFX Limited | Information & communication | 2024 |
| Tinta National Limited | Other services | 2016 |
| Tinta Web Limited | Other services | 2019 |
| Together Home Care Limited | Health & social care | 2022 |