| Purbeck Kitchens Limited | Construction | 2003 |
| Purbeck Landscapes Ltd | Administrative & support | 2024 |
| Purbeck Lettings Limited | Real estate | 2025 |
| Purbeck Personal Assistants Ltd | Health & social care | 2026 |
| Purbeck Shellfish Limited | Wholesale & retail | 2022 |
| Purbeck Site Services Limited | Administrative & support | 2014 |
| Purbeck Sounds Ltd | Information & communication | 2024 |
| Purbeck Stone Construction Ltd | Construction | 2003 |
| Purbeck Systems Design Limited | Wholesale & retail | 1997 |
| Purbeck Tree Nursery Community Interest Company | Agriculture & fishing | 2024 |
| Purbeck View Ltd | Hospitality | 2026 |
| Purbeck Weights and Fitness Ltd | Arts & recreation | 2025 |
| Purbeck Windows & Conservatories Ltd | Construction | 2020 |
| Purple Spotted Media Services Limited | Professional & scientific | 2012 |
| QCT Advisory PTY Ltd | Professional & scientific | 2025 |
| Quantum Chimney Services Ltd | Other services | 2021 |
| Quarr Gallery Ltd | Wholesale & retail | 2009 |
| Quay Foods Ltd | Hospitality | 2012 |
| Quay Property Consultants Ltd | Professional & scientific | 2020 |
| Quayside Breaks Ltd | Hospitality | 2022 |
| R & B Controls Solutions Limited | Professional & scientific | 2010 |
| R and I Holdings Limited | Financial services | 2019 |
| R and I Properties Limited | Real estate | 2019 |
| R S Livestock LLP | | 2022 |
| R.B. Fontana & Sons Limited | Construction | 2007 |
| R.G.Bennett & Co.Limited | Wholesale & retail | 1951 |
| RA Ra's House Ltd | Manufacturing | 2024 |
| Railway House Residents Association Limited | Households | 1986 |
| Raspberry Rose Ltd | Wholesale & retail | 2022 |
| Rebecca Nuttall Limited | Financial services | 2022 |
| Reciprocal Assets Ltd | Real estate | 2024 |
| Reciprocal Motors Ltd | Wholesale & retail | 2021 |
| Recruit Local Limited | Administrative & support | 2015 |
| Red Lobster Developments Ltd | Construction | 2023 |
| Red Train Holidays Ltd | Hospitality | 2022 |
| Redhill Windows Limited | Construction | 2013 |
| Redrock Commercial Finance Ltd | Financial services | 2011 |
| Reform Offshore Consultancy Ltd | Professional & scientific | 2020 |
| Regency Dental Practice (Wessex) Ltd | Health & social care | 2015 |
| Rempstone Joinery Ltd | Construction | 2008 |
| Residents Management (NO. 80) Limited | Households | 1986 |
| RHI Dental Clinic Ltd | Health & social care | 2011 |
| RHS Groundworks Ltd | Construction | 2005 |
| Rhys Court (Swanage) Management Limited | Households | 2008 |
| Ribbonwood Farm Management Company Limited | Households | 2003 |
| Richmond House Management Company (Swanage) Limited | Households | 1985 |
| Ricky's PUB Company Ltd | Hospitality | 2024 |
| Right Hand Care Ltd | Hospitality | 2014 |
| RIK Rose Photography Ltd | Professional & scientific | 2023 |
| Rilos CUT Ltd | Other services | 2025 |
| Riverside Farm Services Limited | Agriculture & fishing | 2002 |
| RNW Electrical and Fire Limited | Construction | 2007 |
| ROB Craig Sound Ltd | Other services | 2004 |
| Rock Sea Moss Ltd | Manufacturing | 2025 |
| Rocklands (Swanage) Limited | Households | 1998 |
| Rocquaine Court Residents Company Limited | Households | 1974 |
| Rogers Hair Fashions Limited | Other services | 2002 |
| Royal British Legion (Earl Haig Memorial) Swanage Club Ltd | Other services | 2020 |
| RT Lettings Ltd | Real estate | 2024 |
| Rudge & Rudge Limited | Wholesale & retail | 2021 |
| Rudia Nexus Limited | Health & social care | 2025 |
| RWM Limited | Professional & scientific | 2007 |
| S & D Scaffolding Limited | Construction | 2020 |
| S & J Trading Limited | Real estate | 2015 |
| S B Trailers (Dorset) Ltd | Manufacturing | 2018 |
| S Tooley Limited | Financial services | 2005 |
| S&K Cleaning Services Ltd | Administrative & support | 2025 |
| S.Brown Carpentry & Building Ltd | Construction | 2018 |
| SAE Seaweed Experiences Ltd | Other services | 2026 |
| SAE Seaweed Ltd | Agriculture & fishing | 2022 |
| Safe-Sale Trading Ltd | Information & communication | 2020 |
| Salisbury Square Restaurants Ltd | Hospitality | 2024 |
| Salt & Cedar Hospitality Limited | Professional & scientific | 2025 |
| Saltire Services Limited | Administrative & support | 2003 |
| Saludoze Solutions Ltd | Information & communication | 2025 |
| Samways & Sons Scaffolding Services Ltd | Construction | 2025 |
| Samways Scaffolding Services Limited | Construction | 2018 |
| Sandlovers Limited | Extraterritorial | 2013 |
| Sandy Feet Ltd | Hospitality | 2023 |
| Sandy Toes Weymouth Ltd | Hospitality | 2024 |
| Sanllehi Arts Limited | Wholesale & retail | 2025 |
| Sarah Silverton Ltd | Health & social care | 2024 |
| Scanify Limited | Health & social care | 2024 |
| Scoopies Ltd | Wholesale & retail | 2010 |
| Sea Court Management Company Ltd | Households | 2010 |
| Seacombe Lodge (Management) Company Limited | Households | 1983 |
| Seacrest (Swanage) Property Management Company Limited | Households | 2004 |
| Seaforth and Richmond Lodge Management Limited | Households | 1995 |
| Seaforth Taxation Limited | Professional & scientific | 2012 |
| Seaplan Limited | Professional & scientific | 2023 |
| Seascapes (Swanage) Limited | Households | 2011 |
| Seasonmaster Contracting Ltd | Other services | 2005 |
| Seaward Court Limited | Real estate | 1996 |
| Sefton Court Management Limited | Professional & scientific | 1989 |
| SEL Electrical (Dorset) Ltd | Construction | 2021 |
| Selby House (Swanage) Limited | Households | 2011 |
| Sell and Sparkle Limited | Other services | 2025 |
| Seven Christmas Markets Ltd | Arts & recreation | 2020 |
| Seven Leisure & Events Ltd | Arts & recreation | 2022 |
| Seventhwave Swanage Ltd | Hospitality | 2016 |