| NBC Dynamics Ltd | Health & social care | 2025 |
| Ncore.Md Ltd | Information & communication | 2026 |
| NDB Lancing Ltd | Wholesale & retail | 2024 |
| Neighbourhood Health Watch Ltd | Health & social care | 2018 |
| Neil Harris Plumbing and Heating Limited | Other services | 2011 |
| Neilwpaediatriccare Ltd | Health & social care | 2018 |
| Nelda Limited | Wholesale & retail | 2026 |
| Nellore Ventures Limited | Professional & scientific | 2022 |
| Neptik Ltd | Information & communication | 2014 |
| Network Trading UK Limited | Wholesale & retail | 2009 |
| Neverstop IT Limited | Information & communication | 1997 |
| New China Catering Limited | Hospitality | 2026 |
| New China Foods Ltd | Hospitality | 2023 |
| New Horizons Academy Trust | Education | 2016 |
| New Monks Ltd | Wholesale & retail | 2024 |
| New Style Apparel Ltd | Wholesale & retail | 2025 |
| Newbery Leisure Ltd | Wholesale & retail | 2013 |
| Newbetech Limited | Information & communication | 2015 |
| Newman Property Holdings Ltd | Real estate | 2024 |
| Nexus Machinery Ltd | Wholesale & retail | 2025 |
| Nfcg Ltd | Manufacturing | 2018 |
| Nice Slices Limited | Hospitality | 2018 |
| Niche Security Ltd | Administrative & support | 2018 |
| Nick Alford Consulting Ltd | Professional & scientific | 2015 |
| Nigark Limited | Real estate | 2021 |
| NO Pressure Driving School Ltd | Education | 2014 |
| Nomad Optimise Ltd | Professional & scientific | 2023 |
| Norton Wagstaffe (West Sussex) Limited | Professional & scientific | 2012 |
| NOT in the Pet Shop Ltd | Wholesale & retail | 2025 |
| Nova Print Studio Ltd | Manufacturing | 2025 |
| Nowy Eesi LP | | 2025 |
| NSF Solutions Ltd | Construction | 2014 |
| Nuflourish Limited | Professional & scientific | 2015 |
| Nustart Optical Limited | Manufacturing | 2015 |
| Nuvio Limited | Information & communication | 2025 |
| Nwick Auto Ltd | Wholesale & retail | 2025 |
| Nyswrld Ltd | Administrative & support | 2024 |
| O'Curniciello Ltd | Hospitality | 2020 |
| Oakwood Lofts Ltd | Construction | 2018 |
| Ocean Bride Limited | Extraterritorial | 2012 |
| Oceanik Limited | Hospitality | 2003 |
| Octopus Primeable Limited | Wholesale & retail | 2022 |
| Offchain Limited | Administrative & support | 2020 |
| OH My Dog Finder Ltd | Information & communication | 2025 |
| Old Manor Road Association Limited | Households | 2006 |
| Oldbrook Boulevard Management Limited | Real estate | 2000 |
| Olive Dining Independent Ltd | Hospitality | 2019 |
| Olive Dining Ltd | Hospitality | 2012 |
| Olivia Lawrence Limited | Administrative & support | 2022 |
| One Shared Vision Ltd | Information & communication | 2018 |
| Onesky Air | Health & social care | 2013 |
| Onside Communications Ltd | Information & communication | 2018 |
| Onyx Formula Ltd | Manufacturing | 2019 |
| Oona Limited | Manufacturing | 2026 |
| Open Courses Ltd | Education | 2021 |
| Open Path Holdings Ltd | Financial services | 2025 |
| Organised Chaos Trading Ltd | Wholesale & retail | 2021 |
| Osam Websites Ltd | Administrative & support | 2011 |
| Oscar Hardy Ltd | Construction | 2003 |
| Otisar Ventures Ltd | Professional & scientific | 2019 |
| Otoro Ltd | Professional & scientific | 2008 |
| Outdoors Limited | Professional & scientific | 1998 |
| Oyster Luxury Travel and Diving Limited | Arts & recreation | 2006 |
| Oyster Rental Properties Ltd | Real estate | 2023 |
| P Slaughter Flooring Ltd | Construction | 2015 |
| P. & S. Designs Limited | Wholesale & retail | 1978 |
| P. Payne & Sons Limited | Construction | 1950 |
| Padjen Ltd | Real estate | 2020 |
| Padovan Systems Limited | Professional & scientific | 2011 |
| Page Windows Limited | Construction | 2022 |
| Panda Creative Ltd | Professional & scientific | 2013 |
| Papadom Limited | Hospitality | 2004 |
| Parafix Holdings Limited | Professional & scientific | 2004 |
| Parafix Limited | Professional & scientific | 1969 |
| Parafix Tapes and Conversions Limited | Manufacturing | 1972 |
| Park Your Ride Ltd | Transport & logistics | 2019 |
| Parsifal London Limited | Real estate | 2020 |
| Parts Unknown Ltd | Information & communication | 2023 |
| Patent Developments International Limited | Professional & scientific | 1981 |
| Paul's Motors Ltd | Wholesale & retail | 2020 |
| Payments Sme's Limited | Professional & scientific | 2017 |
| PB Heating & Mechanical Services Ltd | Construction | 2022 |
| PD Decorating Limited | Construction | 2015 |
| Peacocks Property Ltd | Real estate | 2021 |
| Peakland Cleaning Services Ltd | Administrative & support | 2025 |
| Peakland Home Services Limited | Health & social care | 2023 |
| Pear Commercial Ltd | Extraterritorial | 2023 |
| Pear Group Sussex Ltd | Real estate | 2023 |
| Pear Land and New Homes Ltd | Extraterritorial | 2023 |
| Pear Lettings Sussex Ltd | Extraterritorial | 2023 |
| Pebble Lodge (Shoreham Beach) Limited | Administrative & support | 1984 |
| Pebbles Property and Rentals Limited | Real estate | 2017 |
| Pelican Ocean Ltd | Wholesale & retail | 2011 |
| Pendragon Project Team Building Ltd | Administrative & support | 2025 |
| Penelope-Rose Properties Ltd | Real estate | 2019 |
| Penhill Projects Ltd | Wholesale & retail | 2024 |
| Pennington Juarez Properties Ltd | Real estate | 2025 |
| Penrez Assets Ltd | Financial services | 2025 |
| Penstone Ltd | Construction | 2026 |
| Perfect Pixels Digital Ltd | Information & communication | 2024 |