| Branksome Towers Residents' Association Limited | Households | 1977 |
| Brazil Bar Limited | Hospitality | 2002 |
| Brecktic Ltd | Wholesale & retail | 2025 |
| Bressner (UK) Limited | Information & communication | 2007 |
| Brian C. Rigler Builders Limited | Construction | 2002 |
| Bridport and District Citizens Advice Bureau | Information & communication | 2003 |
| Bridport Arts and Crafts Limited | Wholesale & retail | 2005 |
| Bridport Construction Services Limited | | 1980 |
| Bridport Foundry Ltd | Manufacturing | 1998 |
| Bright Marketing Limited | Information & communication | 2004 |
| Brimsmore Gardens Limited | Wholesale & retail | 1991 |
| Bristol Maid Limited | Manufacturing | 2000 |
| Broadhyper Limited | Real estate | 1988 |
| Brooks (Builders) Limited | Real estate | 1959 |
| Brooks Bros. (Property Maintenance) Limited | Real estate | 1962 |
| Bryanston School | Education | 1927 |
| Buckland Construction Southwest Limited | Construction | 2007 |
| Buckland Developments Southwest Limited | Construction | 2003 |
| Bucknowle Limited | Real estate | 2021 |
| Burebrook Holdings Limited | Construction | 1996 |
| Burebrook Properties Limited | Construction | 1960 |
| Burnbake Campsite Limited | Hospitality | 2005 |
| Busy Retail Limited | Extraterritorial | 2006 |
| Butt Limited | Construction | 1997 |
| Byfrankie Limited | Other services | 2025 |
| Byron Care Limited | Health & social care | 2003 |
| C & O Garden Machinery Limited | Wholesale & retail | 2007 |
| C & O Groundcare Limited | Administrative & support | 2007 |
| C & O Hire Limited | Administrative & support | 2007 |
| C & O Tractors Limited | Manufacturing | 1997 |
| C B a Accountax Limited | Professional & scientific | 2002 |
| C H Philip Green & Sons Limited | Real estate | 2005 |
| C J COX Limited | Manufacturing | 1997 |
| C N Ayling Plastering Limited | Construction | 2005 |
| C Walker Construction Limited | Construction | 2007 |
| C-Qes Limited | Professional & scientific | 1999 |
| C. & O. Construction (Southern) Limited | Extraterritorial | 2001 |
| C.P. Goodall Ltd | Financial services | 2003 |
| Cable First Limited | Manufacturing | 1996 |
| Caboo Learning Limited | Administrative & support | 2007 |
| Caddypager Designs Limited | Professional & scientific | 1996 |
| Cadogan Care Limited | Health & social care | 2000 |
| Calcott Construction Limited | Construction | 1999 |
| Calders Garden Management Company Limited | Households | 2001 |
| Calibre Developments (GB) Limited | Construction | 2014 |
| Canford Haulage Ltd. | Transport & logistics | 1999 |
| Canford Magna Complex Limited | Arts & recreation | 2001 |
| Canford Magna Garden Centre Limited | Wholesale & retail | 2007 |
| Canford Point Management Company Limited | Households | 1999 |
| Car Radios (Dorchester) Limited | Wholesale & retail | 2005 |
| Carbon Busters Ltd | Professional & scientific | 2006 |
| Carmargue Associates Limited | | 1989 |
| Carpet Specialist Steve Lucas & SON Limited | Construction | 2003 |
| Carvets Limited | Extraterritorial | 2003 |
| Cash Control Machines (Pricemarking) Limited | Wholesale & retail | 1985 |
| Casterbridge Fisheries Limited | Professional & scientific | 2004 |
| Castle Gardens Sherborne Limited | Wholesale & retail | 1986 |
| Castle Lodge Construction Limited | Construction | 2007 |
| Castle Point (UK) Ltd | Wholesale & retail | 2006 |
| Catalina Drive (80-83) RTM Company Limited | Real estate | 2005 |
| Catchband Trading Limited | Transport & logistics | 1999 |
| Cavendene Management Limited | Households | 1987 |
| Cavendish Court (Poole) Limited | Households | 1999 |
| Cavendish Place (Management) Limited | Households | 1958 |
| Cavendish School of English Limited | Education | 1995 |
| Ccfs Dorset Ltd | Financial services | 2007 |
| Centaur Financial Services Limited | Financial services | 1987 |
| Centre Link Property Group Limited | Real estate | 1994 |
| Cetera Limited | Information & communication | 2000 |
| Chaddesley Grange Management Company Limited | Households | 2002 |
| Chainlight Limited | Information & communication | 1989 |
| Chamba Developments Limited | Construction | 2005 |
| Charles Lighting Limited | Professional & scientific | 1987 |
| Charmile Court Management Limited | Households | 1991 |
| Chase Software Limited | Professional & scientific | 1984 |
| Chedcraft Limited | Professional & scientific | 1998 |
| Chedington Compost Limited | Manufacturing | 2000 |
| Chelaberd Limited | Financial services | 1981 |
| Chesil Developments Ltd | Real estate | 2004 |
| Chesil Security Ltd | Administrative & support | 2019 |
| Chessington Court (Bournemouth) Management Company Limited | Households | 1962 |
| Childhay Farming Ltd. | Agriculture & fishing | 1996 |
| Chillington Limited | Professional & scientific | 1997 |
| China X Change Limited | Administrative & support | 2007 |
| Chine House Limited | Health & social care | 2006 |
| Chris Croft Training Limited | Other services | 2004 |
| Christchurch Hearing AID Centre Ltd. | Health & social care | 2003 |
| Christchurch Timber & Trading Limited | Wholesale & retail | 1996 |
| Churchfield Court Residents Association Limited | Households | 1966 |
| Churchwood Construction Ltd | Construction | 2019 |
| Citizens Advice Central Dorset Limited | Information & communication | 2001 |
| Citizens Advice in East Dorset and Purbeck Ltd. | Other services | 1998 |
| Clarin Medical Limited | Health & social care | 2008 |
| Clarin Oyster Maritime Limited | Arts & recreation | 2008 |
| Clarity IT Advisors Limited | Information & communication | 2002 |
| Classic Freeads Limited | Wholesale & retail | 2004 |
| Classic Landscaping Services Ltd | Construction | 2019 |
| Claymoor Construction Ltd | Construction | 2006 |
| Clean Living (South) Limited | Administrative & support | 2004 |
| Clean Spaces Limited | Administrative & support | 2001 |