| Quantenergy Ltd | Professional & scientific | 2016 |
| Quantitative Capital Limited | Professional & scientific | 2010 |
| Quantiveo Ltd | Information & communication | 2025 |
| Quants Street Ltd | Professional & scientific | 2026 |
| Quantum Cellpath Limited | Health & social care | 2024 |
| Quantum Gate Limited | Information & communication | 2016 |
| Quantum Infinity Limited | Health & social care | 2021 |
| Quantum Info GB Ltd | Administrative & support | 2015 |
| Quarryhouse Systems Limited | Professional & scientific | 1995 |
| Queen Mary's Gate Management Company Limited | Households | 2006 |
| Queensway Securities Limited | Professional & scientific | 1972 |
| Quelex Limited | Information & communication | 2012 |
| Quest Information Systems Limited | Information & communication | 1986 |
| Quest PIT Payments Ltd | Financial services | 2025 |
| Questeve Limited | Professional & scientific | 2019 |
| Questmoss Limited | Professional & scientific | 2020 |
| Questpit Limited | Real estate | 2015 |
| Questrics Ltd | Financial services | 2023 |
| Quick LEE Does IT Ltd | Arts & recreation | 2016 |
| Quickset Limited | Construction | 2004 |
| Quiddity Partners Limited | Administrative & support | 2020 |
| Quill Communications Limited | Professional & scientific | 2000 |
| Quiltcard.Com Limited | Professional & scientific | 2014 |
| Quince Apps Ltd | Information & communication | 2017 |
| Quintal Pond and Irrigation Ltd | Construction | 2021 |
| Quintanapartners Ltd | Wholesale & retail | 2020 |
| Quintessence Beauty Limited | Other services | 2021 |
| Quintessence Fragrances Limited | Manufacturing | 1982 |
| Quivra Ltd | Wholesale & retail | 2025 |
| R & C Romanian Food Ltd | Wholesale & retail | 2018 |
| R & G Productions Ltd | Information & communication | 2021 |
| R & I Innovation Limited | Real estate | 2010 |
| R & J Property Investments Limited | Real estate | 2018 |
| R & R Coffee Van Limited | Hospitality | 2022 |
| R & R Motors Limited | Wholesale & retail | 1991 |
| R & S Supplies Ltd | Wholesale & retail | 2013 |
| R a Mcleod & Co Limited | Professional & scientific | 1997 |
| R and Y Properties Ltd | Real estate | 2019 |
| R D Huff Construction Limited | Construction | 2024 |
| R L Services (UK) Limited | Health & social care | 2014 |
| R W Associates Limited | Financial services | 2015 |
| R W W Records Limited | Professional & scientific | 1983 |
| R Z O Music Limited | Arts & recreation | 1995 |
| R&P Enterprises Limited | Real estate | 2026 |
| R&R Ambalo Ltd | Financial services | 2024 |
| R&R Design Studio Ltd | Professional & scientific | 2014 |
| R&R Exhibitions Ltd | Wholesale & retail | 2026 |
| R&R Solicitors Ltd | Professional & scientific | 2025 |
| R.A.H Works Ltd | Construction | 2026 |
| R.S.Home Styling Ltd | Construction | 2019 |
| R.Saward Services Ltd | Information & communication | 2011 |
| R.W Specialist Decoraters Ltd | Construction | 2021 |
| R1 Productions Ltd | Arts & recreation | 2013 |
| R2 Care Limited | Health & social care | 2016 |
| R4U Solutions Limited | Information & communication | 2023 |
| R5ERV Ltd | Administrative & support | 2011 |
| R6 Stone Ltd | Manufacturing | 2020 |
| RA Wellness Limited | Arts & recreation | 2024 |
| Raaner Limited | Construction | 2017 |
| Rabg Memorial Limited | Education | 2010 |
| Rabia Khans Ltd | Administrative & support | 2022 |
| Rabs Homes Limited | Real estate | 2021 |
| Racesoft Ltd | Information & communication | 2019 |
| Rachael Alcobi Limited | Professional & scientific | 2003 |
| Rachael Hankinson Limited | Administrative & support | 2010 |
| Radioactive Productions Limited | Information & communication | 2014 |
| Radioator Limited | Real estate | 2018 |
| Ragoz Holdings Limited | Real estate | 2017 |
| Ragyan Limited | Manufacturing | 2025 |
| RAH Advisory Limited | Professional & scientific | 2012 |
| Railen Properties Ltd | Real estate | 2020 |
| Rainbows END Limited | Real estate | 2025 |
| Raise Hospitality Ltd | Administrative & support | 2018 |
| Raje IT Computer Services Limited | Information & communication | 2012 |
| Rajiv Kent Ltd | Health & social care | 2010 |
| Rakx Ltd | Wholesale & retail | 2026 |
| Rally WON Limited | Other services | 2010 |
| RAM UK Trans Ltd | Transport & logistics | 2019 |
| Ramogan Limited | Professional & scientific | 1975 |
| Ramsay Elysium Holdings Limited | Financial services | 2021 |
| Randy's Wings Ltd | Hospitality | 2014 |
| Rankmyhack Ltd | Information & communication | 2013 |
| Raphael Health and Care Homes (Uplands) Limited | Real estate | 2007 |
| Rapid Changeworks Limited | Health & social care | 2018 |
| Rapidz Media Limited | Extraterritorial | 2019 |
| Rares Haulage Limited | Transport & logistics | 2025 |
| Rashid Lettings Ltd | Real estate | 2022 |
| Rashllyas Ltd | Hospitality | 2018 |
| Ratcliffe Group (NE) Ltd | Wholesale & retail | 2018 |
| Rawreign Limited | Other services | 2026 |
| Rayan Travel Ltd | Transport & logistics | 2025 |
| Raymetrics Limited | Extraterritorial | 2015 |
| Raynor Motors Limited | Wholesale & retail | 2025 |
| RAZ Group Ltd | Wholesale & retail | 2014 |
| RAZ Nita Ltd | Construction | 2024 |
| Razuba Limited | Health & social care | 2023 |
| RB Wragg Consulting Services Limited | Professional & scientific | 2025 |
| RBD Roofing Services Ltd | Construction | 2025 |
| RBK Healthcare Ltd | Health & social care | 2020 |
| RBM Education Limited | Education | 2020 |