| Quantum Digital Holdings Limited | Financial services | 2020 |
| Quantum Digital Limited | Information & communication | 2017 |
| Quantum Drive Productions Limited | Other services | 2023 |
| Quartz Supply UK Ltd | Manufacturing | 2024 |
| Quick Decision Finance Limited | Professional & scientific | 2007 |
| Quiet Bear Limited | Professional & scientific | 2023 |
| Quilligan&Sons Roofing&Gardning Ltd | Construction | 2025 |
| Quirk & Partners Ltd | Professional & scientific | 2022 |
| Quirks Mortgage and Finance Limited | Financial services | 2005 |
| R & T Tours Ltd | Extraterritorial | 2016 |
| R and C Becko Ltd | Financial services | 2025 |
| R and R Development and Construction Limited | Construction | 2016 |
| R Arora Properties Limited | Real estate | 2010 |
| R Bennett QS Services Ltd | Construction | 2014 |
| R Electrics Ltd | Construction | 2025 |
| R M Props Limited | Real estate | 2025 |
| R M Squirrel Trading Limited | Professional & scientific | 2018 |
| R P H Maintenance Services Ltd | Construction | 2014 |
| R Paul Stone & Brick Restoration Ltd | Construction | 2026 |
| R Smiles Ltd | Health & social care | 2024 |
| R&F Training Ltd | Wholesale & retail | 2024 |
| R&G Espinosa International Adjusters, Ltd. | Financial services | 2018 |
| R&T Tours Transport Limited | Administrative & support | 1998 |
| R.A. Custom Installations Ltd | Construction | 2003 |
| R.P. Mcwilliams & Co Limited | Construction | 2002 |
| R3 Mortgages Limited | Financial services | 2014 |
| R3SIDENCE London Limited | Real estate | 2013 |
| RA South East Limited | Health & social care | 2018 |
| Rabtech Ltd | Information & communication | 2018 |
| Radford Enterprises Ltd | Wholesale & retail | 2021 |
| Radford Management Limited | Real estate | 1984 |
| Radford Sales Management Ltd | Real estate | 2020 |
| Radiant Reshape Limited | Other services | 2024 |
| Radius Property Limited | Real estate | 2018 |
| Radstocks Retail Limited | Wholesale & retail | 2013 |
| Raffaele Malanga Limited | Administrative & support | 2004 |
| Rail-Os Properties Ltd | Real estate | 2020 |
| Railsync Ltd | Other services | 2024 |
| Railtech Innovations Limited | Construction | 2014 |
| Railtech Resourcing Limited | Administrative & support | 2024 |
| Ramsden Heating Limited | Other services | 2016 |
| Ramsden Motor Repairs Limited | Wholesale & retail | 2005 |
| Ramsden PRE School | Education | 2004 |
| Randall Lawson Interiors Limited | Wholesale & retail | 2024 |
| Range Properties (Essex) Limited | Real estate | 2020 |
| Rapido Software Limited | Administrative & support | 1998 |
| Rar-Ay Consulting Ltd | Construction | 2019 |
| Rar-Ay Consultng Ltd | Information & communication | 2026 |
| Rar-Ay Property Ltd | Real estate | 2022 |
| Rasco Svcs Ltd | Financial services | 2020 |
| Rathbone Advertising Holdings Limited | Financial services | 2026 |
| Rathbone Advertising Limited | Professional & scientific | 2021 |
| Rauzan Estates Ltd | Real estate | 2024 |
| Raxworthy Mortgage Services Ltd | Financial services | 2020 |
| RAY Rees Property Maintenance Limited | Construction | 2019 |
| Rayak Ltd | Professional & scientific | 2010 |
| Rayleigh Road 1965 Limited | Extraterritorial | 2014 |
| Rayleigh Services Ltd | Construction | 2022 |
| Rayridge Products Limited | | 1973 |
| Raztech Electrical Ltd | Construction | 2026 |
| RBW Woods Limited | Construction | 2021 |
| RC Interiors (Essex) Ltd | Construction | 2013 |
| Rcbl Properties Limited | Real estate | 2021 |
| RCH Electrical Ltd | Construction | 2005 |
| RDB Contract Services Ltd | Construction | 2021 |
| RDL Contracts Ltd | Construction | 2018 |
| Re-Gen (UK) Construction Limited | Construction | 2013 |
| Re-Gen Partners Ltd | Other services | 2025 |
| Reactoo Limited | Information & communication | 2016 |
| Ready Raccoon Software Limited | Information & communication | 2025 |
| Readyaimfire Limited | Information & communication | 2022 |
| Readystyle Limited | Construction | 1987 |
| Realcryptomininguk Ltd | Information & communication | 2026 |
| Recall Solutions Limited | Professional & scientific | 2011 |
| Red Desk Management Limited | Professional & scientific | 2022 |
| Red DOT Childcare Services Ltd | Health & social care | 2021 |
| Red-K-Consulting Ltd | Professional & scientific | 2025 |
| Redblue Energy UK Limited | Construction | 1998 |
| Redbrooks Holding Company Ltd | Financial services | 2020 |
| Redbrooks Services Limited | Construction | 2020 |
| Reddey Golf Supplies Limited | Wholesale & retail | 2023 |
| Redfield Brickwork Limited | Construction | 2013 |
| Redi Services Ltd | Information & communication | 2024 |
| Redpath Consultancy Services Limited | Professional & scientific | 2015 |
| Redward Group Limited | Professional & scientific | 2016 |
| Reece Dopson Limited | Financial services | 2020 |
| Reeds of Maldon Ltd. | Construction | 2008 |
| Reef Academy Limited | Arts & recreation | 2017 |
| Reformed With Sophie Limited | Health & social care | 2022 |
| Regan Estates Limited | Real estate | 2016 |
| Regents Contracting Ltd | Construction | 1998 |
| Regents Developments Limited | Real estate | 2023 |
| Reid Services Limited | Administrative & support | 2017 |
| Reinforcing Steel Consultancy Limited | Construction | 2026 |
| Rejuv Skin & Laser Clinic Ltd | Other services | 2023 |
| Relyon IT (UK) Ltd | Other services | 2011 |
| Remedia Group Limited | Professional & scientific | 2015 |
| Renaissance Decor and Flowers Ltd | Wholesale & retail | 2023 |
| Renewagreen Technologies Ltd | Wholesale & retail | 2023 |
| Renown Developments Limited | Construction | 2016 |