| NN Airconditioning Ltd | Construction | 2023 |
| Nomen Luni Limited | Professional & scientific | 2019 |
| Northern Heritage Developments Limited | Construction | 1999 |
| Nova Structural Engineering Limited | Professional & scientific | 2025 |
| Novolani Restaurants Ltd | Hospitality | 2020 |
| NSG Autos Limited | Wholesale & retail | 2012 |
| Nu-Look Renovators Limited | Construction | 2019 |
| Nyssa Limited | Wholesale & retail | 1996 |
| Oakland Moore Ltd | Professional & scientific | 2023 |
| Olidan Limited | Real estate | 2018 |
| OM SAI Enterprise Ltd | Transport & logistics | 2015 |
| One Step Media Limited | Information & communication | 2003 |
| Ontime Management & Solutions Ltd | Professional & scientific | 2024 |
| Ontime Media Logistics Limited | Other services | 2015 |
| Opmd Limited | Professional & scientific | 2009 |
| Optimus OD Limited | Administrative & support | 2012 |
| Orbital Solutions Consulting Limited | Information & communication | 2020 |
| Orchard Corporate Strategy Limited | Professional & scientific | 2014 |
| Orderflow AI Ltd | Information & communication | 2025 |
| Original Products (Marylebone) Limited | Wholesale & retail | 1947 |
| Osborn Media Limited | Information & communication | 2025 |
| OUT and About Advertising Limited | Professional & scientific | 2006 |
| Owelec Limited | Construction | 2011 |
| Oxplas Limited | Wholesale & retail | 2004 |
| P Bowden Heating Limited | Construction | 2017 |
| P Lower Consulting Limited | Education | 2015 |
| P R Photos Limited | Professional & scientific | 2006 |
| P. a. Spittles Landscapes Limited | Administrative & support | 2003 |
| Paddypass Ltd | Administrative & support | 2025 |
| Palaeo Environmental Research and Consultancy Services Limited | Professional & scientific | 2021 |
| Pamal Properties Limited | Real estate | 2021 |
| Pang Papers Limited | Education | 2022 |
| Parkfield Rise Management Limited | Real estate | 2005 |
| Patientflow AI Ltd | Health & social care | 2025 |
| Paul Bloom Ltd | Extraterritorial | 2019 |
| Paulsweld Limited | Manufacturing | 2015 |
| Pavilion Way Management Company Limited | Households | 1991 |
| Pclj Limited | Professional & scientific | 2016 |
| PDL Property Management Limited | Real estate | 2024 |
| Peal Sound Limited | Information & communication | 2004 |
| Penn Place Associates Limited | Professional & scientific | 2000 |
| Pepin Construction Ltd | Construction | 2017 |
| PER4MANCEHUB International Ltd | Professional & scientific | 2019 |
| Perpetual Labs Ltd | Information & communication | 2019 |
| Perrys Management Services Limited | Real estate | 2002 |
| Pharmassure Ltd | Information & communication | 2018 |
| Pharus Ltd | Public administration | 2024 |
| Phillip J Gollins General Builder Ltd | Construction | 2009 |
| Pierre Bohanna Ltd | Financial services | 2024 |
| Piso Group Limited | Administrative & support | 2024 |
| Piso Limited | Construction | 2019 |
| Piso Property Holdings Limited | Real estate | 2023 |
| PJM Consulting Services Limited | Real estate | 2019 |
| Pkora Express Ltd | Hospitality | 2026 |
| Plaka Builders Limited | Construction | 2016 |
| Planet Machine Tools Ltd. | Manufacturing | 2002 |
| Playback Video Ltd | Wholesale & retail | 2025 |
| Plush Hair & Beauty Ltd | Other services | 2015 |
| PM Investors Ltd | Households | 2019 |
| Podium Campervan Hire Ltd | Administrative & support | 2026 |
| Poké Stumppy Ltd | Wholesale & retail | 2024 |
| Pondview Properties Ltd | Real estate | 2022 |
| Ponto Productions Limited | Arts & recreation | 2024 |
| POP Design and Projects Limited | Professional & scientific | 2015 |
| POP UP Comedy Events Limited | Arts & recreation | 2023 |
| Preluvable Ltd | Wholesale & retail | 2025 |
| Premium Property Sourcing Ltd | Administrative & support | 2025 |
| Prgolfclub.Com Ltd | Arts & recreation | 2012 |
| Princes Risborough Limited | Other services | 2013 |
| Private Boat Hire Limited | Transport & logistics | 2016 |
| PRK Monks Ltd | Hospitality | 2023 |
| Procuresmart Services Limited | Administrative & support | 2015 |
| Profile Plumbers Ltd | Construction | 2013 |
| Project Green Book Ltd | Information & communication | 2007 |
| PROMEGA4 Pets Ltd | Manufacturing | 2021 |
| Proverbs 163 Cleaning Services Ltd | Administrative & support | 2026 |
| Psychotherapy Ltd | Health & social care | 2018 |
| PT Consultant Ltd | Professional & scientific | 2024 |
| Purcom Procurement Services Limited | Administrative & support | 2012 |
| Putnam Properties Ltd | Real estate | 2020 |
| QED Marine Limited | Transport & logistics | 2019 |
| Quantum Consulting Accountants Limited | Professional & scientific | 1994 |
| Quantum Estates Investments Limited | Real estate | 2024 |
| Quantum Jobs.Com Limited | Information & communication | 1995 |
| Quantum Properties (UK) Limited | Real estate | 2001 |
| Quelch Construction Limited | Manufacturing | 2023 |
| Quinton Property Management Ltd | Households | 2019 |
| R & a Electrical Limited | Construction | 1998 |
| R J Groundcare Limited | Administrative & support | 2015 |
| R Nish Carpentry Ltd | Construction | 2016 |
| R.E.C Insight and Investments Limited | Real estate | 2024 |
| Rachel Callum Beauty Limited | Other services | 2025 |
| Radstone Security Systems Ltd | Administrative & support | 2021 |
| Rainbows END Investments and Property Management Limited | Administrative & support | 2012 |
| Rapid Ventures Holdings Limited | Financial services | 2025 |
| Rapid Ventures Operations Limited | Health & social care | 2025 |
| Rapid Ventures Property Limited | Real estate | 2025 |
| RBE Medical Consultancy Limited | Professional & scientific | 2024 |
| RBE Motorsport & Coaching Limited | Arts & recreation | 2026 |
| Read Cooper Limited | Professional & scientific | 2007 |