| Nginuity Limited | Manufacturing | 2007 |
| NIB Accounting Services Limited | Professional & scientific | 2016 |
| Nick Heap Building & Brickwork Ltd | Construction | 2010 |
| Nigel King Electrical Services Limited | Construction | 2009 |
| Niven Homes Group Limited | Construction | 2024 |
| NKS Transport Limited | Wholesale & retail | 2003 |
| Nlightened Software Limited | Information & communication | 1999 |
| NMF Property Ltd | Real estate | 2023 |
| NO Excuse Films Ltd | Arts & recreation | 2018 |
| NO Hidden Extras Ltd | Administrative & support | 2004 |
| NO OIL on the Canvas Limited | Hospitality | 2018 |
| NO.1 Home Limited | Construction | 2015 |
| NO.1 Symes Road Management Company Limited | Households | 1992 |
| Noble Fire Doors Ltd | Construction | 2025 |
| Noble Property Solutions South Ltd | Construction | 2023 |
| Noetic Mining Solutions Ltd | Mining & quarrying | 2012 |
| Nohow Limited | Professional & scientific | 2017 |
| Noon Holdings Limited | Extraterritorial | 2021 |
| Noon Limited | Professional & scientific | 2019 |
| Norman Motors (Ferndown) Limited | Real estate | 1978 |
| North's Ice Cream Ltd | Hospitality | 2022 |
| North-Of-The-Border ULC | Extraterritorial | 2014 |
| Northbridge Advisors Limited | Information & communication | 2026 |
| Northcanal Limited | Professional & scientific | 2019 |
| Nortical Limited | Professional & scientific | 2012 |
| Norton Engineering Consultants Ltd | Professional & scientific | 2021 |
| NOT a Guru Ltd | Information & communication | 2021 |
| Nova Arts Limited | Real estate | 1968 |
| Nurturing OUR Community CIC | Agriculture & fishing | 2022 |
| NXT2NU Limited | Wholesale & retail | 2021 |
| O & F Catering Ltd | Hospitality | 2014 |
| Oak and Vine Co Ltd | Construction | 2026 |
| Oakdale Electrical Ltd | Construction | 2003 |
| Oakvia Limited | Wholesale & retail | 2023 |
| Obstakiller Limited | Arts & recreation | 2019 |
| OC Greens Limited | Administrative & support | 2023 |
| Ocaris Wealth Management Ltd | Financial services | 2021 |
| Ocean Fish & Chips Limited | Hospitality | 2025 |
| Old Beams Ibsley Ltd | Hospitality | 2019 |
| Oliver's Contracting Ltd | Construction | 2024 |
| Olivers Heating Limited | Construction | 2011 |
| Omenga Eldery Care Ltd | Health & social care | 2022 |
| Omnisector Limited | Professional & scientific | 2011 |
| ON the Button Communications Limited | Information & communication | 2015 |
| ON the MAP Promotions Limited | Professional & scientific | 2018 |
| OP Advisory Limited | Professional & scientific | 2013 |
| Openmind Collective Ltd | Manufacturing | 2015 |
| Optimal Marketing Global Limited | Professional & scientific | 2021 |
| OR Beverage & Food Ltd | Hospitality | 2024 |
| OS Climate Solutions Limited | Wholesale & retail | 2026 |
| Oskey Jack Ltd | Real estate | 2023 |
| Osprey International Limited | Administrative & support | 2015 |
| Oswin Oswald Limited | Information & communication | 2022 |
| OUT of the Office Limited | Administrative & support | 2009 |
| Ovenking DT Limited | Administrative & support | 2021 |
| Ovenking Limited | Administrative & support | 2013 |
| Ovenking Nationwide Limited | Administrative & support | 2014 |
| Ovenking SO Limited | Administrative & support | 2016 |
| Ozil Penn Ltd | Hospitality | 2016 |
| P & D Cards Limited | Wholesale & retail | 2017 |
| P J Aiken Insurance Services Limited | Financial services | 2002 |
| P.M.Stevens Limited | Administrative & support | 2003 |
| Paddi Graphics Limited | Arts & recreation | 2001 |
| PAG Associates Limited | Professional & scientific | 2017 |
| Palmer Gray LLP | | 2023 |
| Palms Property Limited | Financial services | 2022 |
| Paragon Sports Coaching Ltd | Education | 2022 |
| Parker Johnson Building Limited | Construction | 2012 |
| Parley Computers Ltd. | Information & communication | 1991 |
| Parley Cross Garage Limited | Wholesale & retail | 2015 |
| Parley Health Ltd | Health & social care | 2025 |
| Parsons Property Law Limited | Professional & scientific | 2021 |
| Party FUN Hire Limited | Administrative & support | 2022 |
| Partyballoonz Ltd | Wholesale & retail | 2024 |
| PAT Test Care LLP | | 2023 |
| PAT Test Solutions Ltd | Professional & scientific | 2023 |
| Patash Ltd | Professional & scientific | 2003 |
| Patientia AI Ltd. | Information & communication | 2020 |
| Paul Watters Contractor Limited | Construction | 2001 |
| PBF Property Limited | Real estate | 2025 |
| PCB Design Solutions Limited | Information & communication | 2015 |
| PDL (Dorset) Ltd | Construction | 2017 |
| PDL (Hampshire) Ltd | Construction | 2017 |
| PDL Group Ltd | Professional & scientific | 2016 |
| PDV (South) Limited | Administrative & support | 2014 |
| Pearmain Property Solutions Ltd | Real estate | 2026 |
| Pegasus International Horse Transport Ltd | Agriculture & fishing | 2026 |
| Pellere Development Ltd | Professional & scientific | 2021 |
| Penfold Financial Ltd | Financial services | 2026 |
| Penge Management Limited | Households | 2019 |
| Pennys Court Management Limited | Construction | 1969 |
| Perfect Dress Company Ltd | Manufacturing | 2019 |
| Perficio Global Solutions Ltd | Professional & scientific | 2019 |
| Performance Specialist Cleaning Services Limited | Administrative & support | 2016 |
| Performance Watercraft Specialists Ltd | Manufacturing | 2019 |
| Personal Tax Management Limited | Extraterritorial | 2004 |
| Petherway Limited | Construction | 2000 |
| PHD in Communications Limited | Information & communication | 1996 |
| Phil Rowley Photography Ltd | Professional & scientific | 2003 |
| Philinda Limited | Real estate | 1980 |