| PSC Management Consultancy Limited | Professional & scientific | 2007 |
| Pump-Tech Ltd | Wholesale & retail | 2018 |
| Quality Carpentry & Joinery Limited | Manufacturing | 2003 |
| R and a Haines Building Contractors Limited | Construction | 2009 |
| R P Carpentry Limited | Construction | 2010 |
| Rabbit and the Rose Ltd | Extraterritorial | 2017 |
| RBN Holdings Ltd | Wholesale & retail | 2018 |
| Rdge Associated Limited | Financial services | 2014 |
| Reconeyez UK Ltd | Administrative & support | 2019 |
| Recreational Sports Limited | Wholesale & retail | 2007 |
| Red Lion Antiques Ltd | Professional & scientific | 2024 |
| Redleaf Enterprises Limited | Real estate | 2009 |
| Repped Ltd. | Professional & scientific | 2015 |
| RMS Boatyard Limited | Extraterritorial | 2010 |
| Roar Scaffolding Ltd | Construction | 2022 |
| Robbins Elson Ltd | Manufacturing | 2012 |
| Robral Limited | Professional & scientific | 2020 |
| ROE Properties Ltd | Real estate | 1997 |
| Roman Restorations Limited | Professional & scientific | 2024 |
| RUK Canoe & Accessories Ltd | Extraterritorial | 2009 |
| RUK Sport Limited | Wholesale & retail | 2009 |
| Ryan Alexander Associates Ltd | Administrative & support | 2017 |
| S Zaman SE Ltd | Wholesale & retail | 2022 |
| S+C Associates Limited | Manufacturing | 2009 |
| Safesource Limited | Manufacturing | 2025 |
| Samco Construction Limited | Construction | 2001 |
| Samco Homes Limited | Real estate | 2024 |
| Samuel Vine Holdings Ltd | Financial services | 2024 |
| Selectronix Limited | Manufacturing | 1979 |
| Sharps Property Limited | Real estate | 2026 |
| Silbury Property Solutions Limited | Hospitality | 2013 |
| Silchester Body Shop Limited | Wholesale & retail | 2012 |
| Sites to Suit Limited | Information & communication | 1999 |
| Slough Firework Factory Limited | Wholesale & retail | 2013 |
| Slough Plastering Contractors Limited | Construction | 2004 |
| SMC Electronics Limited | Professional & scientific | 2010 |
| Sophie Harvey Limited | Other services | 2018 |
| Sophie Head Interiors Limited | Professional & scientific | 2011 |
| Soprano Digital Media Ltd | Information & communication | 2016 |
| Southern Remedial Services Limited | Water & waste | 1978 |
| Spartan Refinishing Limited | Manufacturing | 2021 |
| Sphere App Ltd | Information & communication | 2023 |
| Sportbot Europe Limited | Information & communication | 2022 |
| ST Fimbarrus Holdings Limited | Professional & scientific | 2012 |
| ST Katherine's Care Limited | Health & social care | 2016 |
| Stage Struck School of Performing Arts Limited | Arts & recreation | 2003 |
| Starr Electronic Services Limited | Information & communication | 1988 |
| Stealth Sports Management Ltd | Arts & recreation | 2017 |
| Stefan Gomoll & Co | | 2004 |
| Stonework by Steve Ltd | Manufacturing | 2009 |
| Stork Solutions Limited | Wholesale & retail | 2017 |
| Stratosphere Executive Ltd | Administrative & support | 2021 |
| Summit Holding Group Ltd | Construction | 2025 |
| Sun Hill Surveys Ltd | Construction | 2020 |
| Superior Specialist Vehicles Limited | Extraterritorial | 1999 |
| Taab Laboratories Equipment Limited | Manufacturing | 1980 |
| Tadley Tyre Services Limited | Wholesale & retail | 2010 |
| TEN4 Production Services Limited | Information & communication | 2014 |
| Tendworks Ltd | Professional & scientific | 2025 |
| Thames Canoe Hire Limited | Administrative & support | 2010 |
| Thames Valley Roofing Contractors Ltd | Extraterritorial | 2009 |
| Thames Valley Roofing Ltd | Construction | 2009 |
| Thames Valley Roofing Supplies Ltd | Wholesale & retail | 2013 |
| THC Flooring Limited | Construction | 2017 |
| THE Big Show Fireworks Ltd | Wholesale & retail | 2023 |
| THE Brett Partnership Ltd | Professional & scientific | 2004 |
| THE Chelsea Family Practice Ltd. | Health & social care | 2017 |
| THE City Pest Company Limited | Administrative & support | 2019 |
| THE Dispense Department Ltd | Administrative & support | 2024 |
| THE FOX & Hounds Donnington Limited | Hospitality | 2014 |
| THE Great Food Company (Berkshire) Ltd | Hospitality | 2013 |
| THE Kalkara Big Whole Company Ltd | Professional & scientific | 2022 |
| THE Old Mill (Aldermaston) LLP | | 2025 |
| THE Pedal on Trustee Company Limited | Professional & scientific | 2022 |
| THE Tadley Trust C.I.C. | Wholesale & retail | 2024 |
| THE Training Academy Romsey Ltd | Other services | 2021 |
| THE Village Butcher (Kingsclere) Limited | Wholesale & retail | 2016 |
| THG Holdings Ltd | Health & social care | 2022 |
| Thorngrove Properties Limited | Construction | 2010 |
| Thorngrove Wood Street Limited | Construction | 2012 |
| TLG Property Holdings Ltd | Real estate | 2020 |
| Tmct Associates Limited | Households | 2008 |
| TOG Aviation Limited | Transport & logistics | 2008 |
| TOM Faulkner Limited | Manufacturing | 2011 |
| Topicas Limited | Professional & scientific | 2011 |
| Torella Property Limited | Households | 2008 |
| Totalcare Hygiene Services Limited | Administrative & support | 2014 |
| Tradefin International Limited | Financial services | 2001 |
| Tradefin Wealth Limited | Other services | 2022 |
| TT Reading Limited | Hospitality | 2013 |
| UCI Limited | Information & communication | 2020 |
| Ultreia Energy Consulting Limited | Professional & scientific | 2013 |
| Unique Expert Solutions Limited | Wholesale & retail | 2001 |
| United Leather Corporation Limited | Professional & scientific | 1997 |
| Vapour Wise Ltd | Wholesale & retail | 2015 |
| Vectair Environmental Limited | Professional & scientific | 1993 |
| Victoria Armstrong Fine Art Limited | Wholesale & retail | 1996 |
| Villa Golf Limited | Administrative & support | 2017 |
| Vinola Ltd | Health & social care | 2020 |
| Virginia Water Cars Limited | Transport & logistics | 2000 |