| Noonan Electrical Ltd | Construction | 2006 |
| Norman & Wallace Limited | Administrative & support | 2016 |
| Northfield Consultants Limited | Real estate | 2008 |
| Northington Limited | Real estate | 2000 |
| NP SAP Consultancy Ltd | Information & communication | 2014 |
| NR Sonic Services Ltd | Health & social care | 2022 |
| Nuaimi Consultancy Limited | Other services | 2022 |
| Nuaimi Holdings Limited | Real estate | 2020 |
| Nylon Blow Limited | Other services | 2014 |
| O' Brien Dimmock Properties Limited | Real estate | 2011 |
| Oakmont Close Management Limited | Real estate | 2022 |
| Obetv International Ltd | Information & communication | 2025 |
| Ocean Star Ltd | Wholesale & retail | 2025 |
| Ocean VCT PLC | Financial services | 2017 |
| Offshore Partners Limited | Professional & scientific | 2018 |
| Old Park Lane Management Services Limited | Professional & scientific | 2019 |
| Once Upon a Destination Ltd | Administrative & support | 2022 |
| Only Boards Graphics Ltd | Manufacturing | 2025 |
| Onyx Enterprise Ltd | Transport & logistics | 2013 |
| Ophir Consultants Ltd | Professional & scientific | 2024 |
| Opulence Homes Ltd | Real estate | 2017 |
| Orbital Care Services 2 Ltd | Health & social care | 2019 |
| Orbital Care Services Ltd | Health & social care | 2017 |
| Orbital Living Ltd | Health & social care | 2019 |
| Oreo 7 Ltd | Financial services | 2007 |
| Outram Road Limited | Households | 2004 |
| Outthebox Digital Limited | Education | 2021 |
| Ownlife Limited | Health & social care | 1994 |
| Ownlife Residential Ltd | Health & social care | 2005 |
| P&K Design Ltd | Construction | 2016 |
| P.A.L.S. Management Company Limited | Households | 2000 |
| Paean Films Limited | Information & communication | 2015 |
| Palcol Limited | Real estate | 2020 |
| Park Road ST Helens Limited | Health & social care | 2015 |
| PAT Properties Limited | Real estate | 2001 |
| Patterdale Music Limited | Arts & recreation | 1983 |
| Paul Stapleton Consultancy Limited | Administrative & support | 2022 |
| PCJ Specialty Limited | Financial services | 2026 |
| Peach Aesthetics Ltd | Other services | 2013 |
| Peak Performance Events Limited | Administrative & support | 2022 |
| Peamew Digital Limited | Information & communication | 2014 |
| Pennyweights Automatic Enrolment Limited | Professional & scientific | 2010 |
| Pepukai Information Management Limited | Information & communication | 2014 |
| Peter Hull Associates Limited | Education | 2010 |
| PFG Properties Limited | Real estate | 2003 |
| PFT Freehold Limited | Real estate | 2021 |
| Phantom Core Limited | Extraterritorial | 2019 |
| Picherre Limited | Professional & scientific | 2017 |
| Pine House Hospital Ltd. | Health & social care | 2016 |
| Planning Consent UK Ltd | Construction | 2017 |
| Playpal App Limited | Information & communication | 2025 |
| Pmuk (London) Ltd | Real estate | 2011 |
| Pmuk Secretaries Limited | Administrative & support | 2003 |
| Pond Close Residence Limited | Households | 2015 |
| Pooch Construction Limited | Construction | 2017 |
| Port Wine Investments Ltd | Financial services | 2026 |
| Porters Holdings Limited | Real estate | 2015 |
| Porters Lease DV Limited | Real estate | 2024 |
| Porters Lease ED Limited | Real estate | 2024 |
| Powell Associates UK Limited | Professional & scientific | 2002 |
| Practical Accountancy Ltd | Professional & scientific | 2021 |
| Prash Surveying & Consultancy Ltd | Professional & scientific | 2025 |
| Presh Investments Limited | Professional & scientific | 2012 |
| President Blinds Limited | Wholesale & retail | 1991 |
| Prima Donna (Cheam) Limited | Other services | 2018 |
| Prima Donna Products Limited | Other services | 2020 |
| Prime Psychotherapy Limited | Health & social care | 2016 |
| Primeops Limited | Information & communication | 2025 |
| Pristine Source Ltd | Wholesale & retail | 2026 |
| Procreate Ltd | Arts & recreation | 1998 |
| Proline Auto Ltd | Wholesale & retail | 2026 |
| Property North Cyprus Limited | Information & communication | 2019 |
| Property Social Events Limited | Administrative & support | 2016 |
| Property Training Made Simple Limited | Administrative & support | 2014 |
| PRS Partnerships Limited | Administrative & support | 2016 |
| PSW Recruitment Ltd | Administrative & support | 2023 |
| Pure-Hearted Support Limited | Health & social care | 2024 |
| Purley Bedrooms Ltd | Manufacturing | 2022 |
| Queen's Terrace Management Company Limited | Households | 1983 |
| Quinque Investments Limited | Financial services | 2024 |
| R & H Interiors UK Limited | Construction | 2009 |
| R Creations Ltd | Information & communication | 2024 |
| R Leigh Wills Ltd | Other services | 2018 |
| Racqueteers Ltd | Wholesale & retail | 2024 |
| Radian Foods Ltd | Wholesale & retail | 2013 |
| Rainbow Success Limited | Administrative & support | 2012 |
| Ravens Acre Maintenance Company Limited | Households | 1966 |
| RAZ Barber Ltd | Other services | 2024 |
| Rebello Consulting Limited | Professional & scientific | 2016 |
| Recommended Tradesmen Ltd | Construction | 2023 |
| Red Cinnamon Productions Limited | Professional & scientific | 2012 |
| Redamare Ltd | Wholesale & retail | 2025 |
| Redstone Consulting Services Limited | Information & communication | 2024 |
| Reeza Computers Ltd | Information & communication | 2026 |
| Reeza Estates Ltd | Real estate | 2024 |
| Retail-Lift Ltd | Professional & scientific | 2026 |
| Reverbco Limited | Real estate | 2012 |
| Richerway Limited | Professional & scientific | 2022 |
| Rigel Consulting Ltd | Information & communication | 2019 |
| Rigel Networks Ltd | Information & communication | 2019 |