| New York City Zebra Limited | Information & communication | 2022 |
| Newman Lettings Ltd | Real estate | 2022 |
| Neworsa Limited | Extraterritorial | 2013 |
| Nicholas & Sons Holdings Limited | Financial services | 2013 |
| Nicholas H Wood Limited | Arts & recreation | 2024 |
| Nivi Transport Ltd | Transport & logistics | 2021 |
| Nixon and Shaw Opticians Ltd | Wholesale & retail | 2018 |
| NO Ordinary Life Ltd | Arts & recreation | 2022 |
| Nook Cafe&Bistro Ltd | Hospitality | 2025 |
| Noris Technologies Limited | Information & communication | 2023 |
| Norton Stainless Engineering Limited | Professional & scientific | 2009 |
| Notserp Ltd | Construction | 2018 |
| Novacast Limited | Manufacturing | 1979 |
| Novus Business Consultants Limited | Water & waste | 2020 |
| Nudge Wiltshire Ltd | Wholesale & retail | 2025 |
| NW Promotions Limited | Professional & scientific | 2018 |
| NWG Academy Ltd | Education | 2015 |
| NXS Investments Ltd | Information & communication | 2024 |
| O'Reilly's Repairs Ltd | Wholesale & retail | 2023 |
| Oak and Stone Landscapes and Construction Ltd | Professional & scientific | 2026 |
| Oakfield LEE Estate Planning Ltd | Financial services | 2023 |
| Oakfield LEE Financial Planning Ltd | Financial services | 2021 |
| Office Evolution Ltd | Wholesale & retail | 2005 |
| OLA Support Ltd | Arts & recreation | 2021 |
| Oldknow PUB Company Ltd | Hospitality | 2019 |
| OM Clinic Ltd | Health & social care | 2024 |
| Omega Window Cleaning Group Ltd | Administrative & support | 2019 |
| Omega Window Cleaning Ltd | Administrative & support | 2018 |
| Onepluszero Ltd | Arts & recreation | 2013 |
| Onism Ltd | Wholesale & retail | 2023 |
| Oped UK Limited | Wholesale & retail | 2011 |
| Opseccon Limited | Administrative & support | 2026 |
| Optimus Electrical Contractors Limited | Construction | 2018 |
| Orchardlea Aesthetics Ltd | Other services | 2018 |
| Ortheq Ltd | Professional & scientific | 2024 |
| Oscar Beauty and Spa Ltd | Other services | 2025 |
| Osiris Security (SW) Ltd | Administrative & support | 2025 |
| OT Energy Consulting Ltd | Professional & scientific | 2025 |
| OUR Property Your Home Ltd | Real estate | 2018 |
| Outmarsh Books Limited | Wholesale & retail | 2004 |
| Ozsen Ltd | Other services | 2014 |
| P&T Medical Ltd | Health & social care | 2024 |
| Padfield Porkies Pantry Limited | Hospitality | 2014 |
| PAM UN Limited | Administrative & support | 2017 |
| Panda Lifestyle Ltd | Wholesale & retail | 2019 |
| Paragon Technology Solutions Limited | Professional & scientific | 2008 |
| Parker Knoll Cabinets Limited | Extraterritorial | 2005 |
| Parker Knoll Limited | Extraterritorial | 2005 |
| Parker Knoll Upholstery Limited | Manufacturing | 1973 |
| Partridge Medical Solutions Ltd | Health & social care | 2021 |
| Pasa Barber Limited | Other services | 2019 |
| Pasha Hairdresser Limited | Other services | 2021 |
| Paul Clark Sales Consulting Limited | Professional & scientific | 2017 |
| Paul Prout Haulage Limited | Transport & logistics | 2010 |
| Paul Wootten Double Glazing Ltd | Construction | 2012 |
| PAV Construction Limited | Manufacturing | 2024 |
| Paved in Stone Limited | Administrative & support | 2019 |
| PDH Roofing Ltd | Construction | 2016 |
| Pearson Decorating Specialists Ltd | Construction | 2023 |
| Pensio Limited | Information & communication | 2023 |
| Perrott Electrical Ltd | Construction | 2025 |
| Pest-Spec Limited | Administrative & support | 2016 |
| Pete Clark & SON Ltd | Construction | 2022 |
| PH Activeed Ltd | Education | 2011 |
| PH Camps Ltd | Arts & recreation | 2017 |
| Pharma Research Reading Limited | Professional & scientific | 2018 |
| Philip J Alford Ltd | Construction | 2016 |
| Phoenix Motorcycle Training Chippenham Ltd | Education | 2024 |
| Pint Sized Properties Ltd | Real estate | 2024 |
| Pitstop Transport Ltd | Wholesale & retail | 2025 |
| Planck Properties Ltd | Real estate | 2025 |
| Plastics by Design Limited | Administrative & support | 2008 |
| Play Healing C.I.C. | Education | 2018 |
| Playtech Leasing Limited | Administrative & support | 2025 |
| Polska Szkola Jezyka Ojczystego IM. Zolnierzy Niezlomnych W Woking Ltd | Education | 2021 |
| Ponsford & Birks Ltd | Real estate | 2025 |
| Post and Provisions Ltd | Wholesale & retail | 2019 |
| Pouchka Consulting Limited | Information & communication | 2010 |
| PRB Industries Ltd | Information & communication | 2021 |
| Premier Flooring Wiltshire Ltd | Construction | 2015 |
| Premier Motors Wiltshire Ltd | Wholesale & retail | 2025 |
| Preston Kitchens Ltd | Other services | 2017 |
| Prhr Limited | Professional & scientific | 2013 |
| Prime Commercial Solutions Limited | Professional & scientific | 2024 |
| Primetext Business Messaging Ltd | Information & communication | 2026 |
| Primetext Limited | Information & communication | 2000 |
| Prior & Company (SW) Limited | Construction | 1990 |
| Pro Alloys Ltd | Manufacturing | 2024 |
| Procol Holdings Limited | Financial services | 2018 |
| Procol Limited | Administrative & support | 1995 |
| Property Pathfinders Ltd | Administrative & support | 2025 |
| Proud FIX Prestige Ltd | Construction | 2025 |
| PSL Traffic Solutions Ltd | Construction | 2022 |
| Q Select Limited | Administrative & support | 2017 |
| Qdos Homes Limited | Construction | 1999 |
| Qdos Homes Potterne Limited | Real estate | 2021 |
| Qdos Homes Wincanton Limited | Construction | 2021 |
| Queenfield Ltd | Construction | 2022 |
| Queensway Chapel (Melksham) | Other services | 2010 |
| R & L Cars Limited | Wholesale & retail | 2010 |