| Nioby Limited | Real estate | 2004 |
| Nnbd Building Limited | Manufacturing | 2023 |
| Noble Mews Management Company Limited | Households | 2006 |
| Nook and Huddle Franchise Ltd | Administrative & support | 2025 |
| Nook and Huddle Ltd | Administrative & support | 2024 |
| North Shore Strategy Ltd | Professional & scientific | 2022 |
| Novus Vita Holdings Ltd | Financial services | 2026 |
| Nurphy & Sasha Ltd | Transport & logistics | 2019 |
| Nutt Holding Co Limited | Financial services | 2021 |
| Nyeweb Ltd | Information & communication | 2018 |
| Oakleaze Holdings Limited | Real estate | 1955 |
| Oaksey Investments Ltd. | Professional & scientific | 2012 |
| Ocean Atlas Limited | Professional & scientific | 2025 |
| Ocean Electric Power Limited | Energy | 2007 |
| Octagon (Malmesbury) Management Limited | Households | 2005 |
| Odysseycx Limited | Professional & scientific | 2015 |
| Oflow.Io Ltd | Information & communication | 2018 |
| OH Essential Limited | Health & social care | 2018 |
| OJM Advisory Ltd | Professional & scientific | 2019 |
| Old Bakehouse 2020 Limited | Manufacturing | 2020 |
| Old Inn Property Ltd | Real estate | 2025 |
| Old Station Mews Property Management Company Limited | Households | 2010 |
| Olive Hills ARF Limited | Professional & scientific | 2022 |
| Omega Electrical Ltd | Professional & scientific | 2015 |
| One Place Limited | Other services | 2020 |
| Opencroft Limited | Financial services | 1988 |
| Orlebar Green Limited | Administrative & support | 2011 |
| Orta Solar Ltd | Construction | 2011 |
| Oxbow Resourcing Limited | Professional & scientific | 2023 |
| P and T Poultry Limited | Wholesale & retail | 2005 |
| Panhurst UK Limited | Professional & scientific | 2007 |
| Parabellum Partners Ltd | Professional & scientific | 2026 |
| Parabellum Systems Ltd | Information & communication | 2026 |
| Paradise Engineering Ltd | Wholesale & retail | 2024 |
| Parallel Running Ltd | Professional & scientific | 2015 |
| Parsons Carpentry & Building Services Limited | Construction | 2013 |
| Paul Mccarthy Plastering Ltd | Construction | 2012 |
| PD Fitness Ltd | Arts & recreation | 2009 |
| PDP Enterprises Limited | Arts & recreation | 2023 |
| Peaches Nursery Ltd | Health & social care | 2024 |
| Pedlamc Limited | Professional & scientific | 2018 |
| Peerless Communications Limited | | 1987 |
| Penncon Ltd | Professional & scientific | 2025 |
| People for Anything Ltd | Transport & logistics | 2024 |
| Percat Limited | Administrative & support | 2024 |
| Perex Limited | Information & communication | 2022 |
| Perfection Skin & Beauty Clinic Limited | Other services | 2010 |
| Perox Limited | Professional & scientific | 2022 |
| Persephone Violet Limited | Wholesale & retail | 2013 |
| Pesttrain Limited | Professional & scientific | 2019 |
| PGA Payroll Limited | Professional & scientific | 2018 |
| PGA Tax Returns Limited | Professional & scientific | 2021 |
| PH Mapplebeck & Associates Ltd | Extraterritorial | 2021 |
| Philip Gurnhill Accountants Limited | Professional & scientific | 2017 |
| Phine Consortium Limited | Extraterritorial | 2017 |
| Phine Consulting Ltd | Information & communication | 2004 |
| Phosphor Tech Ltd | Arts & recreation | 2016 |
| Pickwick Health Ltd | Other services | 2018 |
| Piers Whitney Consulting Ltd | Information & communication | 2001 |
| Pili-Pala Project Management Ltd | Households | 2019 |
| Pineapple Audio Production Ltd | Information & communication | 2018 |
| PIT Stop MTS Ltd | Wholesale & retail | 2013 |
| Planet Wild Ltd | Manufacturing | 2020 |
| Plasmaa Ltd | Wholesale & retail | 2025 |
| Platinumsmith Ltd | Professional & scientific | 2011 |
| PMC Fibre Ltd | Information & communication | 2022 |
| Pocket Limited | Wholesale & retail | 1999 |
| Pocket Spaces Limited | Real estate | 2023 |
| Pods Plan Ltd | Wholesale & retail | 2024 |
| Pollydogs Consulting Ltd | Professional & scientific | 2024 |
| Pontari Limited | Information & communication | 2026 |
| Porcupine Productions Limited | Information & communication | 2017 |
| Posh Narrowboats Ltd | Hospitality | 2021 |
| Positive Hospitality Limited | Professional & scientific | 2024 |
| Poynton Ltd. | Agriculture & fishing | 2000 |
| Prepared for Change Ltd | Professional & scientific | 2024 |
| Prestige Computer Services Limited | Information & communication | 2006 |
| Prestige Domestic Cleaning Ltd. | Wholesale & retail | 2023 |
| Prestige Performance Collection Storage Limited | Transport & logistics | 2025 |
| Priory Coach House Ltd | Wholesale & retail | 1994 |
| Prism Systems Limited | Information & communication | 1992 |
| Pro-Porters (Logistics) Ltd. | Transport & logistics | 2011 |
| Profile Studio Group Ltd | Financial services | 2017 |
| Profile Studio Limited | Manufacturing | 2014 |
| Prylia Limited | Professional & scientific | 2007 |
| PTA Transport Ltd | Transport & logistics | 2016 |
| Pulse Business Software Limited | Information & communication | 2006 |
| Purlieus Battery Storage Ltd | Professional & scientific | 2021 |
| Purple Tulip Limited | Professional & scientific | 2022 |
| QNM Ltd | Professional & scientific | 2005 |
| Quantic Properties (Axminster) Limited | Real estate | 2001 |
| Quercus Talent Solutions Limited | Other services | 2026 |
| R & R Baker Limited | Agriculture & fishing | 2003 |
| R.H. Tomlinssons (Trowbridge) Limited | Construction | 1992 |
| Rajah Restaurant (Malmesbury) Ltd | Hospitality | 2026 |
| Ramilby Estates Limited | Real estate | 1970 |
| Ramshorn Properties Limited | Construction | 2006 |
| Rank Properties Ltd | Other services | 2015 |
| Rankibl Ltd | Information & communication | 2018 |
| Rattlebone Sherston Ltd | Hospitality | 2018 |