| Orris Digital Limited | Information & communication | 2017 |
| Oruen Limited | Professional & scientific | 2012 |
| Oxhey Digital Consulting Limited | Information & communication | 2017 |
| Palm Tree Day Nursery Ltd | Health & social care | 2013 |
| Patel Consulting (Tech) Limited | Information & communication | 2014 |
| Path EDU Ltd | Education | 2014 |
| Pbis + Ltd | Information & communication | 2016 |
| PC Security Private L.P. | | 2018 |
| PCD Services London Limited | Construction | 2017 |
| PCG London Limited | Real estate | 2015 |
| PD Patel Ltd | Other services | 2024 |
| PDB Mgmt Limited | Real estate | 2022 |
| PDC Consolidated Limited | Other services | 2018 |
| Pennwood Court (Pinner) Residents Management Limited | Households | 1974 |
| Pentstrend General Trading Co. Limited | Wholesale & retail | 1964 |
| Percy Restaurants Ltd | Hospitality | 2021 |
| Perfect Business Information Systems Ltd | Information & communication | 2012 |
| Perfect Image Consultants Limited | Health & social care | 2009 |
| Perfect Image Holdings Limited | Financial services | 2024 |
| Perpetual Technologies Limited | Information & communication | 2016 |
| Pharma Practice Limited | Health & social care | 2014 |
| Phoenix Group (London) Limited | Construction | 2016 |
| Physio Sport Limited | Health & social care | 2021 |
| Pinaka Debt Recoveries Ltd | Professional & scientific | 2018 |
| Pinnacle PVT Ltd | Real estate | 2017 |
| Pinner MOT and Auto Centre Limited | Wholesale & retail | 2015 |
| Pinner Road Developments Ltd | Real estate | 2026 |
| PJ Sakura Limited | Real estate | 2021 |
| POP of the Block Ltd | Manufacturing | 2026 |
| PR Dent Services Ltd | Health & social care | 2015 |
| PRD Healthcare Limited | Health & social care | 2019 |
| Press 10 Limited | Professional & scientific | 2008 |
| Prima Collective Limited | Financial services | 2026 |
| Primo Clothing Ltd | Wholesale & retail | 2022 |
| Prokad Engineering Limited | Professional & scientific | 2018 |
| Prudenta Homes Ltd | Real estate | 2014 |
| Prudenta House Ltd | Real estate | 2014 |
| Prudenta Investments Limited | Real estate | 2017 |
| Prudenta Properties Ltd | Real estate | 2017 |
| Purely Grounded Ltd | Wholesale & retail | 2023 |
| Puri UK Limited | Other services | 2006 |
| Quanta R.A. Limited | Real estate | 2005 |
| Quick Care Solutions Ltd | Information & communication | 2025 |
| R&B Design Management Ltd | Other services | 2022 |
| RAD Construction Management Ltd | Construction | 2020 |
| Rade Protection Securities Ltd | Administrative & support | 2015 |
| Raheem&Co Accountants Ltd | Professional & scientific | 2017 |
| Rainbow Fostering Services Ltd | Health & social care | 1998 |
| Rasila Ltd | Construction | 2013 |
| Ready Steady Glow Limited | Wholesale & retail | 2005 |
| Really Big Tomatoes Limited | Extraterritorial | 2010 |
| Reel Cakes Ltd | Manufacturing | 2025 |
| Reel Capital Ltd | Real estate | 2021 |
| Reel Developments Ltd | Real estate | 2025 |
| Reel Fitness Ltd | Financial services | 2024 |
| Reel Investment Estates Ltd | Real estate | 2025 |
| Reel Trinity Ltd | Real estate | 2025 |
| Reel Wealth Ltd | Financial services | 2025 |
| Remote Specialist Limited | Professional & scientific | 2011 |
| Rightpharm Ltd | Wholesale & retail | 2013 |
| RKY Advisory Ltd | Professional & scientific | 2026 |
| RMK Kreative Ltd | Arts & recreation | 2016 |
| Roblyn LLP | | 2021 |
| Roda Homes Ltd | Construction | 2026 |
| Rowley & Finch Ltd | Information & communication | 2024 |
| Royston Dental Suite Ltd | Health & social care | 2022 |
| Rppd Limited | Transport & logistics | 2015 |
| RSD Developments Ltd | Real estate | 2002 |
| RSN Investment Holding Ltd | Real estate | 2023 |
| RSN Retail Holding Ltd | Real estate | 2023 |
| Ruhgia Group Ltd | Financial services | 2020 |
| Ruhgia Ltd | Financial services | 2019 |
| Russell Management Limited | Administrative & support | 1993 |
| S & M Consolidated Limited | Financial services | 2018 |
| S a Garage Services Limited | Wholesale & retail | 2020 |
| S K & B Angel Ltd | Hospitality | 2025 |
| S K & B Clapham Ltd | Hospitality | 2025 |
| S K & B Holdings Ltd | Hospitality | 2025 |
| S K & B Kilburn Ltd | Hospitality | 2025 |
| S K & B Romford Ltd | Hospitality | 2025 |
| S K & B Southampton Limited | Hospitality | 2025 |
| S K & B Uxbridge Ltd | Hospitality | 2025 |
| S M Business Ventures Ltd | Professional & scientific | 2022 |
| S.H.W. Limited | Administrative & support | 1999 |
| Sadozai Solicitors Ltd | Professional & scientific | 2014 |
| Sahni Foods UK Limited | Wholesale & retail | 2019 |
| Saint Kitts Hair Limited | Other services | 2012 |
| SAM Accountants & Consultants Ltd | Professional & scientific | 2022 |
| SAM Accountants Ltd | Professional & scientific | 2008 |
| SAM Catena Ltd | Real estate | 2024 |
| SAM Executive Ltd | Real estate | 2017 |
| SAM Management Ltd | Financial services | 2021 |
| SAM Nexus Ltd | Real estate | 2024 |
| SAM Retail Ltd | Professional & scientific | 2020 |
| SAM Venture Ltd | Real estate | 2017 |
| Sand Care Limited | Health & social care | 2007 |
| Sapath Systems Limited | Information & communication | 2007 |
| SAS Private Ltd | Real estate | 2024 |
| SBS Property Solutions Ltd | Real estate | 2020 |
| SDA Management Limited | Real estate | 2021 |