| Prosmart Wheels Romford Limited | Wholesale & retail | 2020 |
| Provident Practices Ltd | Health & social care | 2015 |
| Provolt Services Ltd | Construction | 2023 |
| Pubs 2 Love Ltd | Hospitality | 2024 |
| Puddlebox Limited | Information & communication | 2016 |
| Punjtan Technologies Ltd | Information & communication | 2019 |
| Purimed Ltd | Education | 2018 |
| Purple Housing Limited | Real estate | 2026 |
| Purple Logistics Ltd | Transport & logistics | 2022 |
| Putney Freeholds Limited | Real estate | 2000 |
| Pyracanthum Ltd | Professional & scientific | 2015 |
| Q of London Ltd | Hospitality | 2024 |
| Q U Inns (East London) Ltd | Hospitality | 2017 |
| QA Compliance Ltd | Professional & scientific | 2026 |
| Quality & Integrity Management Services Ltd | Extraterritorial | 2008 |
| Quercus Business Advisory Limited | Professional & scientific | 2018 |
| Quintessence Developments Ltd | Construction | 2015 |
| Quintessence Land & New Homes Ltd | Construction | 2015 |
| Quizling Limited | Wholesale & retail | 2024 |
| Quore Matto Limited | Hospitality | 2017 |
| R D Production Services Ltd | Professional & scientific | 2019 |
| R&J Electronics LLP | | 2013 |
| R.D. Robins Upholsterers Ltd. | Other services | 1992 |
| R.P.F. Group Ltd | Construction | 2024 |
| Raeda Strength and Conditioning Limited | Arts & recreation | 2013 |
| Railway Construction Management Limited | Construction | 2004 |
| Rammpage Ltd | Wholesale & retail | 2026 |
| Rapid Glass (Essex) Ltd | Construction | 2013 |
| Rapid Prop Limited | Real estate | 2010 |
| Rapid Selfstore (Epping) Ltd | Administrative & support | 2023 |
| Rapid Selfstore Ltd | Administrative & support | 2013 |
| Ratio Workshop Ltd | Manufacturing | 2024 |
| RAW Made Simple Ltd | Manufacturing | 2015 |
| RAW Visuals Ltd | Information & communication | 2010 |
| RB Aquatic Wholesale Ltd | Wholesale & retail | 2025 |
| RCP Installations Ltd | Construction | 2006 |
| Reactive Roof Solutions Ltd | Construction | 2024 |
| Read & Caux Heating Solutions Ltd | Construction | 2025 |
| Real Deals NOT Leads Ltd | Administrative & support | 2024 |
| Real Securities Limited | Construction | 1991 |
| Reblex Consultants Limited | Professional & scientific | 1984 |
| Red FIN Films Ltd | Information & communication | 2023 |
| Redfern & Co Accounting Limited | Professional & scientific | 2025 |
| Redrock Fuels Ltd | Wholesale & retail | 2023 |
| Redtree Training Limited | Professional & scientific | 2024 |
| Reemora Ltd | Wholesale & retail | 2025 |
| Refined Beauty Clinic Ltd | Other services | 2025 |
| Rehoboth Law Ltd | Professional & scientific | 2020 |
| Reilly Concrete Pumping Limited | Construction | 1994 |
| Rejuvenurse Limited | Other services | 2024 |
| Remf Solutions Ltd | Other services | 2022 |
| Retrouve Limited | Wholesale & retail | 2018 |
| Revival Shed Leigh Marina Ltd | Other services | 2025 |
| Revival Shed Ltd | Other services | 2025 |
| Revival Yard Ltd | Other services | 2026 |
| Revorg Ltd | Construction | 2025 |
| RG Film Lighting Ltd | Information & communication | 2021 |
| Rhythm Vision Music Ltd | Education | 2025 |
| Richard Nolan & Co (Caversham) Limited | Administrative & support | 1993 |
| Rigveda Ltd | Professional & scientific | 2020 |
| Rimbu Construction Ltd | Construction | 2019 |
| Ringinglow Limited | Administrative & support | 2026 |
| Risk Mitigation Services Limited | Administrative & support | 2017 |
| Rival Business Solutions Limited | Other services | 2012 |
| Riverfish Publishing Ltd | Other services | 2009 |
| Riverfish Records Ltd | Other services | 2009 |
| Riviere Investments Limited | Real estate | 2007 |
| RJ Maintenance London Ltd | Construction | 2023 |
| RJD Electrical Services Limited | Construction | 2018 |
| Rmcollectibles Ltd | Wholesale & retail | 2026 |
| Rnkx Ltd | Information & communication | 2025 |
| Road Ready Driving School Ltd | Education | 2024 |
| ROB Nicoll Consultancy Ltd | Arts & recreation | 2024 |
| ROB Wing (UK) Limited | Information & communication | 2023 |
| ROE 2 SEN Limited | Education | 2025 |
| ROE SEN Limited | Education | 2022 |
| Roesch Company Limited | Wholesale & retail | 2014 |
| Roeyal Crest Allied Health Care Professionals Ltd | Extraterritorial | 2024 |
| Roger Richards Property Management Ltd | Professional & scientific | 2026 |
| Rosebank Nursing Homes Limited | Health & social care | 2000 |
| Rosemoon Estates Ltd | Real estate | 2025 |
| Rosetta Tech Limited | Information & communication | 2020 |
| Rosewood Beauty Ltd | Administrative & support | 2019 |
| Rospel Enterprises Limited | | 1984 |
| Roza Hospitality Ltd | Hospitality | 2023 |
| RR Environmental Ductwork Limited | Construction | 2017 |
| Rssk Services Ltd | Professional & scientific | 2026 |
| RT Project Management Solutions Limited | Professional & scientific | 2011 |
| Ruffi Trade Ltd | Wholesale & retail | 2021 |
| RV Residential Ltd | Real estate | 2013 |
| RYD Limited | Construction | 2014 |
| Ryveann Elizabeth Ltd | Information & communication | 2026 |
| S & B Construction (UK) Ltd | Construction | 2014 |
| S & W Services Limited | Administrative & support | 2008 |
| S P SIM Properties Limited | Real estate | 2017 |
| S S Project Services Ltd | Professional & scientific | 2023 |
| S.A.R. Contracts Limited | Construction | 2006 |
| S.Bennett & Son(Investments)Limited | Real estate | 1947 |
| S.T.W.Y. Ltd | Construction | 2007 |
| S.Wagner. Ltd | Real estate | 2025 |