| Neville Capability Audit Partners Ltd | Professional & scientific | 2017 |
| Neville Legg (Carpentry) Limited | Construction | 2006 |
| Neville Property Limited | Real estate | 2022 |
| New Day Films Ltd | Information & communication | 2022 |
| New Dragon Inn BH1 Ltd | Hospitality | 2025 |
| Newmel Limited | Households | 1989 |
| Newton Court (Block E) Management Company Limited | Professional & scientific | 2000 |
| Newton Court (Swanage) Limited | Real estate | 2000 |
| Newton Grange Swanage Management Company Limited | Households | 2011 |
| Niche Materials Limited | Wholesale & retail | 2010 |
| Nick Wright Ltd | Construction | 2021 |
| Nixons Hardware Ltd. | Wholesale & retail | 2001 |
| Nook of Bath Ltd | Construction | 2018 |
| North Enterprises (Swanage) Limited | Hospitality | 2002 |
| Northbrook Court (Bournemouth) Limited | Households | 2011 |
| NRC Engineering Ltd | Construction | 2020 |
| NTS Property Group Ltd | Real estate | 2022 |
| Nu-Vo HNB Ltd | Other services | 2020 |
| Nuovo AGE Properties Ltd | Real estate | 2014 |
| Nvrg Limited | Financial services | 2019 |
| O'Connells Amusements Ltd | Arts & recreation | 2025 |
| O'Driscoll Trading Limited | Financial services | 2018 |
| Ocean Bay Chalet Owners Association Limited | Professional & scientific | 1994 |
| Ocean Bay Management Company (Swanage) Limited | Households | 1990 |
| Oceana Management Company Limited | Households | 2008 |
| Oceanheart.Ai Ltd | Health & social care | 2024 |
| Offshore Soul Ltd | Wholesale & retail | 2012 |
| Ojjk Ltd | Professional & scientific | 2018 |
| Oliver Hough Ltd | Professional & scientific | 2024 |
| One Thousand Words Limited | Professional & scientific | 2006 |
| One Two Broadcast Services Ltd | Information & communication | 2020 |
| Onwards Upwards (Projects) Ltd | Information & communication | 2023 |
| Orca Property Services Ltd | Real estate | 2012 |
| Original Vape Shop (Ensbury Park) Ltd | Wholesale & retail | 2020 |
| Original Vape Shop Christchurch Ltd | Wholesale & retail | 2023 |
| Osborne House Management Co. (Swanage) Limited | Households | 1987 |
| Osis Design Limited | Information & communication | 2005 |
| OTW Construction Ltd | Construction | 2023 |
| Outlander Outdoors Ltd | Education | 2022 |
| Outside Edge Gardens & Landscapes Limited | Construction | 2008 |
| OVS Ferndown Ltd | Wholesale & retail | 2024 |
| OVS Springbourne Ltd | Wholesale & retail | 2024 |
| Oxys Global Ltd | Education | 2025 |
| P R R Taxis Ltd | Transport & logistics | 2026 |
| P&Kai UK Limited | Professional & scientific | 2014 |
| P. Best Maintenance & Groundworks Ltd | Construction | 2023 |
| P.B. Lewis Builders Limited | Construction | 2002 |
| P.J. Engineering (Swanage) Limited | Construction | 2001 |
| Pagelove Ltd | Information & communication | 2025 |
| Paradise Martini Ltd | Hospitality | 2023 |
| Parkstone MOT Ltd | Manufacturing | 2003 |
| PDG Security Solutions Ltd | Administrative & support | 2024 |
| Pearce Wrixon Associates Ltd | Professional & scientific | 2012 |
| Pearson Builders (Dorset) Ltd | Construction | 2015 |
| Pebble Consulting Ltd | Professional & scientific | 2016 |
| Pebl Graphics Limited | Manufacturing | 2000 |
| Pebl Holdings Limited | Financial services | 2019 |
| PEG Consulting Services Ltd | Professional & scientific | 2024 |
| Penlu Management Company Limited | Households | 2011 |
| People Professional Limited | Other services | 2013 |
| Performance Grappling Ltd | Information & communication | 2024 |
| Perry Management & Property Maintenance Limited | Real estate | 2025 |
| Pesquero Ltd | Construction | 2021 |
| Pet LUV (UK) Limited | Wholesale & retail | 2005 |
| Peter Hammond Consulting Ltd | Professional & scientific | 2012 |
| Pidge & Brick Property Ltd | Real estate | 2026 |
| Pier Head Apartments (Management) Limited | Households | 2020 |
| Pier View Flats (Swanage) Limited | Households | 1983 |
| Pierhead Developments Limited | Construction | 2018 |
| Pierhead Watersports Ltd | Arts & recreation | 2020 |
| Pinnacles Reach Management Company Limited | Real estate | 1985 |
| PIXEL61 Ltd | Information & communication | 2026 |
| PLATFORM10 Energy Ltd | Information & communication | 2026 |
| Plug in Electrical Ltd | Construction | 2019 |
| Pony Palace Ltd | Administrative & support | 2017 |
| Pop'N'Olly C.I.C. | Information & communication | 2019 |
| Portland (GB) Limited | Hospitality | 2010 |
| Portwey Limited | Professional & scientific | 2007 |
| Portwey Surfacing Limited | Construction | 1985 |
| Powermix UK Ltd | Construction | 2018 |
| Powerwash Bros Ltd | Administrative & support | 2024 |
| Pridethrive Limited | Real estate | 1987 |
| Pristine Clean (South) Ltd | Administrative & support | 2022 |
| Pristine Clean Commercial Ltd | Administrative & support | 2024 |
| Prmnt Consulting Limited | Professional & scientific | 2025 |
| Project Coordinators Ltd | Other services | 2018 |
| PTN Systems Ltd | Other services | 2003 |
| Purbeck Angels Ltd | Construction | 2018 |
| Purbeck Bathrooms Limited | Construction | 2012 |
| Purbeck Building Supplies Limited | Wholesale & retail | 2023 |
| Purbeck Candles Ltd | Manufacturing | 2012 |
| Purbeck Carpentry Ltd | Construction | 2003 |
| Purbeck Court Limited | Other services | 1984 |
| Purbeck DRY Stone Walling Ltd | Construction | 2003 |
| Purbeck EAR Care Ltd | Health & social care | 2023 |
| Purbeck Fibreglass Services Ltd | Construction | 2021 |
| Purbeck Heating and Electrical Limited | Construction | 2002 |
| Purbeck Holidays Ltd | Hospitality | 2026 |
| Purbeck House Hotel Swanage Ltd | Extraterritorial | 2013 |
| Purbeck International Chamber Music Festival Limited | Education | 2016 |