| Mvent Group Limited | Other services | 2021 |
| My Perfect Day Ltd | Information & communication | 2023 |
| Myralux Services Limited | Other services | 2021 |
| Myrdinn Pendragon Limited | Other services | 2024 |
| Naly Kitchen Ltd | Hospitality | 2025 |
| Nam-Raw Developments Ltd | Construction | 2019 |
| NDS Driving Services Limited | Transport & logistics | 2016 |
| Nemesis Vidarr Ltd | Administrative & support | 2025 |
| Neronimus Limited | Other services | 2024 |
| New AGE Sports Limited | Manufacturing | 2018 |
| New Moon Films Limited | Information & communication | 1995 |
| New Romney Supermarkets Limited | Real estate | 1972 |
| Newsham Investments Limited | Real estate | 2024 |
| Nexlogic Limited | Other services | 2026 |
| Nextcorp Beheer Limited | Other services | 2025 |
| Nextcorp Limited | Other services | 2025 |
| Nick EDE Ltd | Construction | 2017 |
| Nobel Beheer IBC Limited | Other services | 2020 |
| Noble Motorsport Parts & Sales Ltd | Wholesale & retail | 2025 |
| Noble Motorsport Racing Developments Ltd | Wholesale & retail | 2025 |
| Nonington Court Management (England) Limited | Households | 2003 |
| Northbridge Capital Netherlands Limited | Other services | 2026 |
| Northstar Management Solutions Limited | Professional & scientific | 2017 |
| Novum Initium Limited | Other services | 2025 |
| Novus Domus Limited | Real estate | 2017 |
| Nuez Holdings Limited | Real estate | 2023 |
| NVD Global Technical Support IBC Limited | Other services | 2024 |
| NVD Global Technical Support Limited | Other services | 2024 |
| Oak Creative Design Limited | Professional & scientific | 1998 |
| Oak Hall Passage Company Ltd | Households | 2025 |
| Oasis Bathrooms Ltd | Construction | 2024 |
| Obidosh Limited | Wholesale & retail | 1993 |
| Obma Consultancy Ltd | Education | 2021 |
| Obregon Limited | Professional & scientific | 2009 |
| OC Consultancy Ltd | Other services | 2020 |
| OCG Invest Ltd | Financial services | 2025 |
| Odile Limited | Wholesale & retail | 2024 |
| Offshore HV Services Ltd | Professional & scientific | 2012 |
| Old Town Barber 1 Ltd | Other services | 2018 |
| OM Amma Ltd | Real estate | 2025 |
| Omgk Events Ltd | Administrative & support | 2026 |
| Omnibus Societatibus Apparatu Limited | Other services | 2026 |
| Omniconsult Beheer Limited | Other services | 2023 |
| Omniconsult IBC Limited | Other services | 2023 |
| One Plus One TV Limited | Information & communication | 2013 |
| Only Realty Ltd | Real estate | 2018 |
| Openmoov Ltd | Information & communication | 2022 |
| Optimum Development IBC Limited | Other services | 2026 |
| Optimum Software Engineering Ltd | Information & communication | 2022 |
| Opus Concierge Ltd | Administrative & support | 2020 |
| Orbit Folkestone Ltd | Arts & recreation | 2017 |
| Orchard Fields Management Company Limited | Households | 1995 |
| Orchard People Solutions Ltd | Professional & scientific | 2025 |
| Orla Megan Saunders Limited | Health & social care | 2025 |
| Ormonde Court Limited | Professional & scientific | 1990 |
| Osborne Court (Hythe) Limited | Construction | 2016 |
| Ostrea Assets Limited | Professional & scientific | 2015 |
| Ostrea Consult Limited | Professional & scientific | 2020 |
| Ostrea Holding Limited | Professional & scientific | 2010 |
| Ostrea Management Limited | Professional & scientific | 2010 |
| Ostrea Marketing Limited | Professional & scientific | 2010 |
| Ostrea Nederland Limited | Other services | 2022 |
| Ostrea Participations Limited | Professional & scientific | 2015 |
| Otterpool Park Education Trust | Administrative & support | 2022 |
| Otterpool Park LLP | | 2019 |
| Ottie Shipping Limited | Administrative & support | 2021 |
| Owesome Limited | Professional & scientific | 2009 |
| P D Signs & Installations Ltd | Construction | 2007 |
| P E Ewbank Limited | Construction | 2012 |
| P Polderman Beheer Limited | Other services | 2022 |
| P&K Solution BV Beheer Limited | Other services | 2025 |
| P&K Solution BV Limited | Other services | 2025 |
| Pacific Asia Travel Association United Kingdom & Ireland Chapter Ltd | Other services | 1993 |
| Packart Limited | Other services | 2023 |
| Palm Projects Limited | Real estate | 2025 |
| Palmarsh Hand Car Wash Ltd | Administrative & support | 2025 |
| Pancratius IBC Limited | Other services | 2024 |
| Panel & Paint Ltd | Wholesale & retail | 2003 |
| Panterlo Ltd | Financial services | 2025 |
| Park at the Airport Limited | Extraterritorial | 1963 |
| Parking for Flying Limited | Other services | 1998 |
| Parrish Panels Limited | Administrative & support | 2002 |
| PAS Beheer Limited | Other services | 2024 |
| PAS Europe Beheer Limited | Other services | 2026 |
| PAS Netherlands Limited | Other services | 2024 |
| Pasithea IBC Limited | Other services | 2020 |
| Patels Hospitality Ltd | Hospitality | 2023 |
| Patontour Limited | Other services | 2024 |
| Paul Carney Consultancy Ltd | Professional & scientific | 2025 |
| Paul Wilson Consultancy Ltd | Professional & scientific | 2021 |
| Paulownia Cultures IBC Limited | Other services | 2023 |
| Pausesilver Limited | Real estate | 1986 |
| Payne Catering and Events Ltd | Hospitality | 2025 |
| PCJ Sales Limited | Wholesale & retail | 2025 |
| PCR Services Ltd | Energy | 2020 |
| PDM Construction SE (South East) Limited | Construction | 2014 |
| Peene Farm Management Limited | Households | 2011 |
| PEL Homes Limited | Extraterritorial | 1984 |
| Pennypot News Limited | Wholesale & retail | 2016 |
| Pequannock Limited | Professional & scientific | 2010 |