| My Local Group Limited | Information & communication | 2007 |
| N & J Properties Group Ltd | Construction | 1999 |
| N Smith Electrical Ltd | Construction | 2004 |
| N Trowell & Co Limited | Construction | 2021 |
| N Wilson ENT Ltd | Professional & scientific | 2016 |
| NAN Tuck Housing Ltd | Real estate | 2026 |
| Nellie's Catering Limited | Hospitality | 1990 |
| Nemo Fish and Chips Limited | Hospitality | 2023 |
| NET Synergy Limited | Information & communication | 2000 |
| Netschepirfoods Ltd | Manufacturing | 2018 |
| Newgrove Trading Ltd | Wholesale & retail | 2011 |
| Nexus Performance CIC | Education | 2025 |
| NGS Global Search Limited | Professional & scientific | 2026 |
| Nick Baker Architects Ltd | Professional & scientific | 2010 |
| Nick Manuell Limited | Manufacturing | 2013 |
| Nivens Properties Ltd | Real estate | 2025 |
| NO More Dust Limited | Administrative & support | 2022 |
| Norgate Capital Partners Ltd | Hospitality | 2023 |
| Norman Capel Limited | Agriculture & fishing | 1964 |
| Northover Delicious Limited | Wholesale & retail | 2013 |
| NRG Consulting Ltd | Professional & scientific | 2012 |
| Nscodex Ltd | Information & communication | 2025 |
| NSG Holdings Limited | Financial services | 2019 |
| NST Screens Ltd | Administrative & support | 2019 |
| O SO Clean Window & Carpet Cleaning Ltd | Administrative & support | 2026 |
| O'Reilly Capital Holdings Limited | Financial services | 2018 |
| Oak Frames Direct LLP | | 2009 |
| Oak Porches UK Ltd | Construction | 2019 |
| Oakdene Garage Ltd | Wholesale & retail | 2021 |
| Oakfield Plumbing and Heating Ltd | Construction | 2014 |
| Oaksmith Construction Ltd | Construction | 2009 |
| Oast Group Ltd | Administrative & support | 2026 |
| OBT Contract Limited | Professional & scientific | 2021 |
| Ocelli Limited | Extraterritorial | 2008 |
| Old Barn Property Management Company Limited | Households | 2011 |
| Old Forge Consulting Ltd | Professional & scientific | 2020 |
| Olivia and Friends Limited | Information & communication | 2012 |
| Oliviam Consultants Limited | Professional & scientific | 2025 |
| Ollie & NIC Limited | Wholesale & retail | 2010 |
| Ollie Bear Investments Ltd | Information & communication | 2026 |
| Omurca Plumbing & GAS Limited | Construction | 2017 |
| One Clik Tools Ltd | Manufacturing | 2024 |
| One IT Hub Ltd | Wholesale & retail | 2024 |
| Oniria Ltd. | Health & social care | 2017 |
| Open Road Rentals Ltd | Administrative & support | 2024 |
| OPS Ready Commissioning Ltd | Professional & scientific | 2026 |
| Orange Carp Co. Ltd | Wholesale & retail | 2025 |
| Original Book Fairy Ltd | Manufacturing | 2020 |
| Oscilla Sound LLP | | 2023 |
| Osman and Heidi Ltd | Hospitality | 2014 |
| Osro Limited | Professional & scientific | 1996 |
| OUR Tiny Minds Ltd | Health & social care | 2024 |
| Oxygen Services Ltd | Professional & scientific | 2021 |
| OZ Group Contracting Ltd | Agriculture & fishing | 2021 |
| OZ Group Holdings Limited | Financial services | 2024 |
| OZ Trees Ltd | Agriculture & fishing | 2020 |
| P & L Global Logistics Limited | Administrative & support | 2019 |
| P&L Building and Groundworks Ltd | Construction | 2024 |
| P&N Marr Ltd | Wholesale & retail | 2014 |
| Pack Approved Ltd | Wholesale & retail | 2026 |
| Pacsworks Limited | Professional & scientific | 1999 |
| Pallene Limited | Administrative & support | 2016 |
| Panadent Direct Limited | Wholesale & retail | 1968 |
| Panadent Learning Academy Limited | Professional & scientific | 2006 |
| Pantam Limited | Real estate | 2019 |
| Pantheon Games Limited | Arts & recreation | 2016 |
| Parks Garden & Fencing Services Limited | Agriculture & fishing | 2012 |
| Patchwork Brands Ltd | Financial services | 2022 |
| Patu Limited | Extraterritorial | 2003 |
| Paul Cook Lighting Design Limited | Construction | 2010 |
| Paul Mehra Ltd | Administrative & support | 2016 |
| Paul Rigden Carpentry and Joinery Limited | Construction | 2014 |
| Pavola Associates Limited | Professional & scientific | 2015 |
| Pedalling Arts Limited | Arts & recreation | 1994 |
| Pelham Plants Nursery Ltd | Agriculture & fishing | 2020 |
| Pembree Limited | Manufacturing | 2019 |
| Penfold Hire Ltd | Administrative & support | 2012 |
| Pensions Law Consulting Limited | Professional & scientific | 2020 |
| Peppersmith Limited | Wholesale & retail | 2021 |
| Percy James Engineering Ltd | Professional & scientific | 2019 |
| Perry Media Limited | Information & communication | 2025 |
| Pest Control Direct Limited | Administrative & support | 2002 |
| Petals for Plants Limited | Wholesale & retail | 2003 |
| Peter Carey Ltd | Construction | 2025 |
| Peter Davis Limited | Construction | 2002 |
| Phantasy Designs Limited | Manufacturing | 2005 |
| Phantom Video Ltd | Professional & scientific | 2023 |
| Phase Innovations Limited | Construction | 2015 |
| Philgro Properties Limited | Real estate | 1998 |
| Phoenix Scaffolding (Sussex) Ltd | Construction | 2012 |
| Pichards Ltd | Real estate | 2026 |
| Pine Garage Limited | Wholesale & retail | 2014 |
| Pine View Management Company (S.E.) Ltd | Households | 2025 |
| Pixel Reporting Limited | Information & communication | 2020 |
| Pixelhaus Ltd | Professional & scientific | 2023 |
| Pjaj Consultancy Limited | Real estate | 2016 |
| Playden Cliff Limited | Real estate | 2026 |
| Player Development Football Academy Ltd | Arts & recreation | 2013 |
| Plumbwell Heating Ltd | Extraterritorial | 2006 |
| Pomus Folkestone Ltd | Hospitality | 2025 |