| Barry Harding Consultancy Limited | Professional & scientific | 2003 |
| Bartlett Construction Limited | Construction | 2017 |
| Bassline Beats Productions Limited | Administrative & support | 2023 |
| Batchelor Investments Ltd | Real estate | 2018 |
| Bath Fireplaces Limited | Wholesale & retail | 2014 |
| Bbit Solutions Ltd | Professional & scientific | 2018 |
| Beaty Services Ltd | Administrative & support | 2020 |
| BEN Collyns Thatching Limited | Construction | 2020 |
| Benbury Limited | Administrative & support | 1989 |
| Berkeley Properties Dorset Ltd | Real estate | 2025 |
| Bethell Property Development Ltd | Construction | 2025 |
| BH Electrical (Southern) Ltd | Construction | 2022 |
| BHP Ltd | Wholesale & retail | 2026 |
| Birch Close Cottages Limited | Administrative & support | 2020 |
| Black Cactus Blandford LP | | 2020 |
| Black Cat Café and Catering Ltd | Hospitality | 2026 |
| Blackcap Computing Limited | Information & communication | 1997 |
| Blanchards Bailey LLP | | 2008 |
| Blandford Business Services Limited | Administrative & support | 2018 |
| Blandford Environmental Trust Limited | Professional & scientific | 2010 |
| Blandford Evangelical Church | Other services | 2004 |
| Blandford Forum Gymnastics Club Limited | Education | 2013 |
| Blandford Garden Machinery ( Dorset ) Ltd | Manufacturing | 2015 |
| Blandford Holdings Limited | Transport & logistics | 2017 |
| Blandford House Management Company Limited | Households | 1979 |
| Blandford Industrial Spraying Ltd | Professional & scientific | 2009 |
| Blandford Office Furniture Ltd | Wholesale & retail | 2002 |
| Blandford Property Ltd | Real estate | 2020 |
| Blandford Pubs Ltd | Wholesale & retail | 2026 |
| Blandford Rugby Football Club Limited | Arts & recreation | 2010 |
| Blandford Storage Limited | Transport & logistics | 2024 |
| Blandfordtyres Ltd | Professional & scientific | 2026 |
| Blaneford Ltd | Information & communication | 2019 |
| Blooming Gardens (Dorset) Ltd | Professional & scientific | 2010 |
| Bnvp Ltd | Professional & scientific | 2022 |
| Boat Windows Limited | Manufacturing | 2018 |
| Boden BAU Ltd | Construction | 2003 |
| Body Transformation Clinic Ltd | Other services | 2021 |
| Boil and Broth Ltd | Manufacturing | 2018 |
| Boilerwise Installations Limited | Construction | 2014 |
| Boilerwise LLP | | 2017 |
| Bojit Ltd | Professional & scientific | 2022 |
| Bombay Bespoke Limited | Manufacturing | 2025 |
| Bootiki Beauty Salon Ltd | Other services | 2018 |
| Bootnecks Into Business CIC | Administrative & support | 2020 |
| Booze Tea Club Ltd | Wholesale & retail | 2025 |
| Boudoir Studios Ltd | Professional & scientific | 2025 |
| Brigade Retail Limited | Wholesale & retail | 2017 |
| Brimor Engineering Limited | Manufacturing | 1998 |
| Britannic Ltd | Real estate | 2025 |
| Britannicshire Ltd | Real estate | 2025 |
| Brixeys Limited | Real estate | 2013 |
| Broadmayne Financial Ltd | Financial services | 2019 |
| Broken Ladder Ltd | Information & communication | 2026 |
| Brookhouse Financial Limited | Financial services | 2014 |
| Bryanston Hills House Management Company Limited | Real estate | 2004 |
| Bryanston Hills Management (NO. 1) Limited | Households | 2004 |
| Bunbury Nominees Limited | Professional & scientific | 1985 |
| Burden Bespoke Joinery Ltd | Manufacturing | 2011 |
| Burgla Collective Limited | Manufacturing | 2021 |
| Business Promotions Ltd. | Professional & scientific | 1992 |
| Butifarra Limited | Extraterritorial | 1997 |
| BY the Waves Limited | Professional & scientific | 2018 |
| C & H Property Lettings Ltd | Real estate | 2025 |
| C & O Ebay Limited | Wholesale & retail | 2020 |
| C.H.S. (Winterborne Whitechurch) Management Limited | Households | 1989 |
| C.Harris Consultancy Ltd | Professional & scientific | 2023 |
| Calico and Cotton Ltd | Wholesale & retail | 2011 |
| Canford Classics Ltd | Manufacturing | 2014 |
| Caravan Servicing 4U Ltd | Manufacturing | 2013 |
| Carbon CUT Holdings Limited | Manufacturing | 2016 |
| Carbon CUT UK Limited | Manufacturing | 2011 |
| Carbon CUT UK Trading Ltd. | Manufacturing | 2016 |
| Carefully Curated Parties & Events Ltd | Administrative & support | 2026 |
| Carpets & Laminate Experts Ltd | Construction | 2016 |
| Cartwright Property Worx Ltd | Manufacturing | 2024 |
| Cassandra Consultancy Ltd. | Professional & scientific | 2016 |
| Castle Inns (South West) LLP | | 2011 |
| Catherines Well Management Limited | Households | 1997 |
| Cavalcade of Costume Limited | Arts & recreation | 1995 |
| Cavimax Ltd | Manufacturing | 2016 |
| CBA Services Limited | Professional & scientific | 2015 |
| Cdlgroundworks Ltd | Construction | 2025 |
| CEB Contracts Ltd | Construction | 2018 |
| Cedars Residents Association Limited (the) | Households | 1972 |
| Cemco (Southern) Limited | Manufacturing | 2012 |
| Cersia CIC | Professional & scientific | 2026 |
| CF Enviro Limited | Information & communication | 2025 |
| Chalkhill Management Co. Ltd | Real estate | 1999 |
| Chamen House Residents Association Limited | Households | 1983 |
| Change Festival CIC | Administrative & support | 2019 |
| Chap Clothing Ltd. | Extraterritorial | 2014 |
| Charles Church Fine Art Limited | Manufacturing | 2003 |
| Charlton Interiors Limited | Construction | 2002 |
| Chase Technology Solutions Ltd | Information & communication | 2017 |
| Cheap Printing Dorset Ltd | Administrative & support | 2014 |
| Chedington Investments Limited | Financial services | 2002 |
| Chedington Properties Limited | Construction | 2007 |
| Chloe's Collectibles Ltd | Wholesale & retail | 2026 |
| Chocbox Ltd | Wholesale & retail | 2013 |