| Ringteam Limited | Households | 2001 |
| RIP IT Up,Start Again Ltd | Information & communication | 2009 |
| Ripple Workshop CIC | Health & social care | 2022 |
| RKS Electrics Ltd | Construction | 2012 |
| Rngt Ltd | Health & social care | 2011 |
| Robert Golden Pictures Limited | Arts & recreation | 1985 |
| Rock Pool Dorset Ltd | Wholesale & retail | 2015 |
| Roger Lawrence Design Ltd | Construction | 2008 |
| Room for Improvement Services Ltd | Information & communication | 2025 |
| Root & Rise Consulting LLP | | 2025 |
| Rosamond Court (Dorset) Association Limited | Households | 1963 |
| Roundham House Hotel | | 1995 |
| Royal Terrace Dental Practice Limited | Health & social care | 1997 |
| Ruby Health Analytics Ltd | Professional & scientific | 2024 |
| Rural Ranges Ltd | Construction | 2017 |
| RWG Solar Ltd | Energy | 2025 |
| Ryches Ltd | Other services | 2022 |
| S & E Fish and Chips Ltd | Hospitality | 2020 |
| S Benn Holdings Ltd | Financial services | 2024 |
| S.W.B (Dorset) Limited | Real estate | 2012 |
| Sacred Windows Ltd | Construction | 2026 |
| Safe Access Scaffolding (Dorset) Ltd | Construction | 2024 |
| Salisbury Court Management (Bridport) Company Limited | Households | 1982 |
| SAM Lanka PTE Ltd | Professional & scientific | 2012 |
| Sammii G'S Ltd | Hospitality | 2020 |
| Samways Group Ltd | Professional & scientific | 2022 |
| Saturn Removals Ltd | Transport & logistics | 2014 |
| Saturn Software Ltd | Information & communication | 2013 |
| SB Centre Ltd | Professional & scientific | 2007 |
| Scarboroughs Health Ltd | Administrative & support | 2020 |
| Scheherazade Consulting Ltd | Arts & recreation | 2011 |
| Scheherazade Initiatives Ltd | Arts & recreation | 2011 |
| Screws & Fixings Ltd | Wholesale & retail | 2023 |
| Sctg Trustees Limited | Professional & scientific | 2011 |
| SDS Electrical Ltd | Construction | 2015 |
| Sea Seeker Limited | Agriculture & fishing | 2012 |
| Sea Sisters Ltd | Manufacturing | 2021 |
| Seadown Holiday Park Limited | Hospitality | 1958 |
| Seaking Wildlife Management Ltd | Administrative & support | 2019 |
| Seal Family Investments Limited | Real estate | 2018 |
| Seal Family Properties Limited | Real estate | 2021 |
| Seals Cove Limited | Wholesale & retail | 2016 |
| Seamark Trading Company Ltd | Hospitality | 2023 |
| Seasider Productions Limited | Information & communication | 2012 |
| Sector Three Property Ltd | Real estate | 2016 |
| Seen (Health Tech) Ltd | Information & communication | 2026 |
| Seize Films Ltd | Information & communication | 2013 |
| Selectfew Limited | Real estate | 2002 |
| Sellihca Limited | Hospitality | 2025 |
| Seraux Joames Ltd | Hospitality | 2023 |
| Serpent Trail Race Ltd | Arts & recreation | 2018 |
| Set-A-Side Storage Limited | Transport & logistics | 2000 |
| SEZ Creations Limited | Professional & scientific | 2016 |
| Shapwick Blaise Limited | | 1983 |
| Shared Story CIC | Education | 2023 |
| Sharp's Flooring Ltd | Construction | 2015 |
| Shield Restraint Systems Limited | Transport & logistics | 2014 |
| Ship Faced Limited | Hospitality | 2025 |
| Shipton Gorge Heritage Limited | Other services | 2006 |
| Sholly Barton Ltd | Construction | 2025 |
| Shoreline Wild Sauna Ltd | Other services | 2024 |
| Shortbay Holdings Limited | Financial services | 2016 |
| Signography Print Ltd | Manufacturing | 2024 |
| Skellern Health Limited | Health & social care | 2025 |
| Skyfall Energy Limited | Professional & scientific | 2014 |
| Sladers Yard Cafe Ltd | Hospitality | 2012 |
| Sladers Yard Ltd | Arts & recreation | 2002 |
| Slape Mill Management Company Limited | Households | 2003 |
| Small Engine Services Garden Machinery Limited | Manufacturing | 2013 |
| Snefru Consulting Limited | Information & communication | 1998 |
| Snowbella Stud Limited | Agriculture & fishing | 1999 |
| Solarport Limited | Extraterritorial | 2022 |
| Solarport Systems Limited | Manufacturing | 2015 |
| Sound Estates Limited | Real estate | 2025 |
| South Hants Property Ltd | Real estate | 2021 |
| South West Demolition Limited | Extraterritorial | 2003 |
| South West Fires Limited | Construction | 2021 |
| Southwest Skills Centre Ltd | Education | 2021 |
| Sparkle Motion Valeting Ltd | Administrative & support | 2023 |
| Sparks Property Limited | Real estate | 2016 |
| Species League Ltd | Arts & recreation | 2019 |
| Spence Couriers Ltd | Transport & logistics | 2023 |
| Spindle Flowers & Foliage Ltd | Wholesale & retail | 2024 |
| SPS Dorchester 2023 Limited | Education | 1993 |
| SPS Energy Group Limited | Extraterritorial | 2026 |
| SPS Powerbuild Limited | Construction | 2026 |
| SPS Powergeo Limited | Extraterritorial | 2026 |
| SPS Powerlink Limited | Extraterritorial | 2026 |
| SPS Powerpark Limited | Extraterritorial | 2026 |
| SPS Powerskill Limited | Extraterritorial | 2026 |
| SPS Powersystems Limited | Extraterritorial | 2026 |
| Square Acre Property & Land Ltd | Construction | 2024 |
| SR Works of Art Ltd | Arts & recreation | 2019 |
| ST Cecilia's Meadow Bridport Management Limited | Households | 2003 |
| ST James Bradpole Garage Owners Management Ltd | Real estate | 2009 |
| ST Swithens Stores Ltd | Wholesale & retail | 2023 |
| STAPLES90 Ltd | Wholesale & retail | 2026 |
| Steve Hansford Flooring Ltd | Construction | 2014 |
| Steve Laycock Psychology Limited | Education | 2019 |
| Steve's Hairdressers Limited | Other services | 2002 |