| Proclarity Solutions Ltd | Professional & scientific | 2014 |
| Procure Intelligence Ltd | Professional & scientific | 2024 |
| Product Park Limited | Professional & scientific | 2025 |
| Product Xperts Ltd | Information & communication | 2021 |
| Production Workflows Limited | Information & communication | 2026 |
| Profile Lettings Limited | Real estate | 2023 |
| Programme & Project Solutions Limited | Professional & scientific | 2005 |
| Progressioncapitalone Ltd | Professional & scientific | 2026 |
| Projem Limited | Professional & scientific | 2014 |
| Prooftech Ltd | Administrative & support | 2023 |
| Propelli Consulting Ltd | Professional & scientific | 2024 |
| Proper Products Limited | Professional & scientific | 2012 |
| Property Drawings Limited | Arts & recreation | 2000 |
| Property Investment Tree Ltd | Real estate | 2021 |
| Property Liaison Group Ltd | Real estate | 2019 |
| Property One Assets Ltd | Construction | 2021 |
| Property One Developments Ltd | Construction | 2021 |
| Property Time (2016) Limited | Real estate | 2016 |
| Proprelo Limited | Information & communication | 2026 |
| Proprocure Ltd | Wholesale & retail | 2024 |
| Proptology Limited | Arts & recreation | 2019 |
| Proquant Surveyors Limited | Construction | 2025 |
| Prospero INT Consulting Ltd | Professional & scientific | 2014 |
| Prospero INT Limited | Households | 2021 |
| Protagon Limited | Construction | 2016 |
| Proteco Consultancy Ltd | Administrative & support | 2024 |
| Provideo Ltd | Information & communication | 2019 |
| Provision Electric’S Ltd | Construction | 2019 |
| Prox Intelligence Ltd | Information & communication | 2026 |
| Prumada Ltd | Real estate | 2020 |
| PS Digital Solutions Limited | Professional & scientific | 2013 |
| PS Marketing Limited | Information & communication | 2026 |
| PSD Quality Carpentry Ltd | Construction | 2008 |
| PSM Communications Limited | Professional & scientific | 2023 |
| Psmg LLP | | 2010 |
| PSP Concept Limited | Professional & scientific | 2009 |
| PSR Electrical Ltd | Manufacturing | 2022 |
| PT Food Solutions Limited | Professional & scientific | 2007 |
| Ptolemy Limited | Professional & scientific | 2008 |
| Pudding Lingerie Ltd. | Wholesale & retail | 2006 |
| Pure Nirvana Limited | Manufacturing | 2008 |
| Pure Plastering Limited | Construction | 2015 |
| Pure Retro Fashion Ltd | Wholesale & retail | 2019 |
| Pure Spa Therapy Limited | Health & social care | 2010 |
| Puri Realty Limited | Real estate | 2013 |
| Purple Gifts Ltd | Wholesale & retail | 2019 |
| Purpose Reimagined Ltd | Professional & scientific | 2024 |
| Push Culture Limited | Administrative & support | 2013 |
| PWD Limited | Real estate | 2021 |
| PWS Rides Ltd | Manufacturing | 2015 |
| Pyramid Building and Construction Ltd | Construction | 2025 |
| Q2 Health Consulting Ltd | Professional & scientific | 2016 |
| QAS Kebabs & Grill Ltd | Hospitality | 2018 |
| Qasr AL Madina Used Cars UK Ltd | Wholesale & retail | 2021 |
| QED Education Group Limited | Administrative & support | 2017 |
| Quadrella Gardens Management Company Limited | Households | 2013 |
| Quality Gleam Services Ltd | Administrative & support | 2025 |
| Quayside House (RTM) Company Limited | Households | 2021 |
| Quayside House (Thames Side) Management Company Limited | Households | 2009 |
| Qubes Coffee Ltd | Hospitality | 2025 |
| Qudu Ltd | Information & communication | 2022 |
| Quest Interactive Ltd | Information & communication | 2025 |
| Question Creative Associates Limited | Professional & scientific | 2009 |
| Quickora Corp Ltd | Wholesale & retail | 2026 |
| Quikkly Limited | Information & communication | 2013 |
| Quinn Lodge (Sutton) Management Company Limited | Households | 2019 |
| Quinsall Limited | Construction | 2011 |
| Quoitings Chase Management Company Limited | Households | 2006 |
| Quorin Specialty Limited | Financial services | 2022 |
| QV London Limited | Wholesale & retail | 2014 |
| QV London Racing Limited | Financial services | 2024 |
| R H Salons Ltd | Other services | 2019 |
| R M Butler Ltd | Professional & scientific | 2022 |
| R Sembhi Construction Ltd | Construction | 2022 |
| R Square Consulting Ltd | Information & communication | 2018 |
| R Squared Ventures Ltd | Real estate | 2018 |
| R&B One Cleaning Service Ltd | Other services | 2017 |
| R&G Restaurants Ltd | Hospitality | 2025 |
| R&K Enterprise Limited | Wholesale & retail | 2005 |
| R&Z Restaurant Ltd | Hospitality | 2025 |
| R. K. Dega Limited | Health & social care | 2003 |
| R.A.G Cleaning Services Limited | Administrative & support | 2025 |
| R.E.Melvin & Company Limited | | 1969 |
| R.Sedra Ltd | Education | 2021 |
| R2 Design Consultancy Limited | Professional & scientific | 2025 |
| R3L Resourcing Limited | Professional & scientific | 2018 |
| RA2 Housing Ltd | Real estate | 2024 |
| Radar London Ltd | Professional & scientific | 2012 |
| Radar Ltd | Information & communication | 2026 |
| Radford Restorations Ltd | Wholesale & retail | 2014 |
| Radii Solutions Ltd | Information & communication | 2019 |
| Radiomovies Limited | Information & communication | 2013 |
| RAF Trans Services Ltd | Transport & logistics | 2018 |
| Rafferty William Limited | Professional & scientific | 2025 |
| RAJ Sharma MOT Services Ltd | Wholesale & retail | 2025 |
| Raja Property Investments Ltd | Real estate | 2021 |
| RAK & Ghez Ltd | Real estate | 2023 |
| Ralston Court Freehold Ltd | Real estate | 2023 |
| Ralston Court Residents Association Ltd | Households | 2001 |
| Ramanay Property Investments Ltd | Real estate | 2016 |