| NJ Business Enterprise Limited | Agriculture & fishing | 2021 |
| NJ Business Services Limited | Professional & scientific | 2016 |
| NJ Business Top Limited | Financial services | 2021 |
| NJC Consultancy Limited | Professional & scientific | 2013 |
| NJL Consulting Ltd | Professional & scientific | 2022 |
| NNC Holdings Ltd | Financial services | 2025 |
| NNC80 Limited | Financial services | 2025 |
| NNC81 Ltd | Information & communication | 2025 |
| Noola Redclaw Ltd | Professional & scientific | 2021 |
| Norris Group Holdings Limited | Financial services | 2025 |
| Norris Holdings Limited | Professional & scientific | 2023 |
| North Langton Ltd | Administrative & support | 2017 |
| Nostia Travel Group Ltd | Administrative & support | 2026 |
| Nrcb Pubs Ltd | Hospitality | 2024 |
| NRP Technical Services Limited | Construction | 2014 |
| Numbakruncha Limited | Professional & scientific | 2005 |
| Nursery Close Management Company Limited | Households | 1995 |
| O'Hara Moore Properties Ltd | Real estate | 2024 |
| Oakborne Online Outlet Store Ltd | Wholesale & retail | 2019 |
| Oakford Oysters Limited | Wholesale & retail | 1990 |
| Oakwood (Dorset) Ltd | Wholesale & retail | 2017 |
| Oakwood Taxis Limited | Transport & logistics | 2010 |
| Octetcyber Ltd | Information & communication | 2021 |
| Offcamber Limited | Wholesale & retail | 2019 |
| Ohtekkers Ltd | Information & communication | 2015 |
| Oink Design Studio Ltd | Professional & scientific | 2025 |
| Okapi and Co (South) Limited | Professional & scientific | 2025 |
| Okeford Advisory Ltd | Professional & scientific | 2022 |
| Okeford Building Company Limited | Construction | 2010 |
| Okeford Holdings Limited | Extraterritorial | 2017 |
| Okehill Design Limited | Arts & recreation | 2016 |
| Okewood Limited | Agriculture & fishing | 2022 |
| Old Dairy Farm Manco Limited | Households | 2022 |
| Old Lodge Mews Property Management Limited | Households | 2022 |
| Old P.O. Mews Management Company Limited | Households | 2021 |
| Oldfield Asset Co Ltd | Manufacturing | 2013 |
| ON the Wing UAV Limited | Information & communication | 2016 |
| Open House Estate Agents North and West Dorset Ltd | Real estate | 2026 |
| Optimised Services Limited | Wholesale & retail | 2024 |
| Oranagepaperproductions Ltd | Information & communication | 2025 |
| Orchard Street Arboricultural Consultancy Ltd | Professional & scientific | 2020 |
| Outstanding Interiors Limited | Administrative & support | 2013 |
| Owen Davies Consultant Limited | Professional & scientific | 2024 |
| Oxford Building & Carpentry Limited | Construction | 2002 |
| P & S Hill Limited | Construction | 2019 |
| P&B WAX Removal Limited | Health & social care | 2020 |
| P&Tl Consulting Limited | Professional & scientific | 2025 |
| P.J.L. Electrical & Security Limited | Construction | 2002 |
| P1 Projects Ltd | Professional & scientific | 2024 |
| P2B Ltd | Professional & scientific | 2013 |
| Packhound Limited | Manufacturing | 2025 |
| Paddock Images Limited | Information & communication | 2003 |
| Padel Supply Ltd | Wholesale & retail | 2026 |
| Pamper & Stay Ltd | Hospitality | 2025 |
| Pamper&Play Ltd | Hospitality | 2024 |
| Parr Grove Residents' Association Limited | Households | 1979 |
| Parva Cottages Management Limited | Real estate | 2000 |
| Pash Property Limited | Real estate | 2025 |
| Pathway Alarms Ltd | Administrative & support | 2015 |
| Pathway Property Management Ltd | Real estate | 2024 |
| Patrick & Pascal Limited | Administrative & support | 2026 |
| Paul Cornick Ltd | Construction | 2015 |
| Paul Feirn Fiberglassroofs Limited | Construction | 2021 |
| Paul Kobayashi Limited | Health & social care | 2009 |
| Paynes Courtyard Management Limited | Households | 2000 |
| Peak Scaffold Limited | Construction | 2016 |
| Penview Homes Limited | Construction | 1999 |
| Perform Physiotherapy Ltd | Public administration | 2026 |
| Perry & Perry Limited | Construction | 1982 |
| Personalised Learning Dorset Limited | Education | 2018 |
| Peru Treks Holdings Limited | Financial services | 2015 |
| Pet Barn Blandford Ltd | Wholesale & retail | 2025 |
| Peter Braithwaite Floor Screeders Limited | Construction | 2024 |
| Peter Osborne Exhibitions Limited | Manufacturing | 2015 |
| PF Consulting Ltd | Information & communication | 2025 |
| Phillips Plant Property Countryside Ltd | Agriculture & fishing | 2021 |
| Pigtails Ltd | Other services | 2007 |
| Pimperne Property Limited | Real estate | 2024 |
| Pinder, COX & Company Limited | Professional & scientific | 1996 |
| Pitmans Removals and Storage Limited | Transport & logistics | 2012 |
| Pitmans Storage Limited | Transport & logistics | 2018 |
| Pivot Padel Limited | Arts & recreation | 2026 |
| Planet Zarg Limited | Information & communication | 2017 |
| Planning Base Ltd | Professional & scientific | 2011 |
| Plant ME Botanics London Ltd | Wholesale & retail | 2014 |
| Plant ME Botanics Ltd | Wholesale & retail | 2014 |
| Plasticable Limited | Manufacturing | 1997 |
| Play IT Again UK Ltd | Administrative & support | 2015 |
| Plotlab Limited | Professional & scientific | 2017 |
| Plumbum Consulting Limited | Information & communication | 2024 |
| Poole Harbour Agriculture Group CIC | Agriculture & fishing | 2021 |
| Poole Oyster Company Limited | Agriculture & fishing | 1990 |
| Poole Sea Produce Limited | Agriculture & fishing | 1993 |
| Portuguese Treasures Ltd | Wholesale & retail | 2021 |
| Pottpets Ltd | Manufacturing | 2025 |
| Practicallymagic Ltd | Wholesale & retail | 2024 |
| Precision Interior Installations Ltd | Construction | 2025 |
| Prehabilitation and Perioperative Care CIC | Health & social care | 2024 |
| Premium GAS Services Ltd | Construction | 2020 |
| Price Engineering Ltd | Professional & scientific | 2023 |