| Baby Belle Ltd | Wholesale & retail | 2024 |
| Badham Developments Limited | Real estate | 2021 |
| Balanced Paws Ltd | Other services | 2023 |
| Bambuni Ltd | Wholesale & retail | 2010 |
| Bampton Pharmacy Ltd | Wholesale & retail | 2014 |
| Bannfin Consulting Limited | Professional & scientific | 2019 |
| Bard Electrical Limited | Construction | 2020 |
| BARTLETTS2025 Ltd | Construction | 2025 |
| Batchelor and Company Accountants Limited | Professional & scientific | 2021 |
| Bawdon Geological Services Limited | Professional & scientific | 2005 |
| Bawlers Gate Holdings Ltd | Financial services | 2025 |
| Beechcroft Motors Ltd | Wholesale & retail | 2022 |
| Beguiling Homes Ltd | Real estate | 2021 |
| Belgrave Court (Taunton) Management Company (NO.2) Limited | Households | 2004 |
| Belqueg Limited | Wholesale & retail | 2025 |
| Benson Family Limited | Financial services | 2023 |
| Berwood Tree Care Ltd | Agriculture & fishing | 2026 |
| Bespoke Plastic Fabrications Limited | Manufacturing | 2018 |
| Betterer Limited | Information & communication | 2024 |
| BH Preserves Limited | Manufacturing | 2022 |
| BHC Property Solutions Ltd | Construction | 2017 |
| Bhuiyan Curry Ltd | Hospitality | 2026 |
| Bhumble Ltd | Wholesale & retail | 2025 |
| Bickenbridge Limited | Professional & scientific | 2007 |
| BID Jockey Ltd | Information & communication | 2024 |
| Biodtex Technologies Ltd | Hospitality | 2024 |
| Biomimetic Academy Limited | Health & social care | 2025 |
| Bioscan Ltd | Hospitality | 2015 |
| Bizflix Infra Limited | Construction | 2024 |
| Black Scorpion Miniatures Ltd | Manufacturing | 2021 |
| Blackdown Anaesthesia Ltd | Health & social care | 2024 |
| Blackdown Aviation Ltd | Transport & logistics | 2020 |
| Blackdown Buildings Limited | Manufacturing | 2012 |
| Blackdown Contractors Limited | Agriculture & fishing | 2016 |
| Blackdown Court Limited | Real estate | 2010 |
| Blackdown Glamping Ltd | Hospitality | 2016 |
| Blackdown Group Limited | Financial services | 2018 |
| Blackdown Meadow (2002) Management NO 3 Limited | Administrative & support | 2002 |
| Blackline Accident Repairs Limited | Wholesale & retail | 2019 |
| Blackline Holdings Limited | Financial services | 2023 |
| Blackwing Consulting Limited | Professional & scientific | 2012 |
| Blossomwood Limited | Financial services | 2026 |
| Blue Scooter Limited | Information & communication | 2015 |
| Blue Wave Construction Limited | Construction | 2011 |
| Bluebird Landscaping Ltd | Administrative & support | 2025 |
| Bogdanov's Real Estate Ltd | Real estate | 2024 |
| Bolthead Limited | Information & communication | 2014 |
| Bourne Collective Ltd | Other services | 2024 |
| Bramble Hedge Limited | Real estate | 1999 |
| Branded Solutions Ltd | Information & communication | 2026 |
| Bridge M&A Ltd | Professional & scientific | 2023 |
| Bridge Mergers & Acquisitions Limited | Professional & scientific | 2001 |
| Bridwell Park New MGT Limited | Hospitality | 2024 |
| Brighter Enabling Ltd | Administrative & support | 2021 |
| Broad Oak Studios Limited | Other services | 2015 |
| Brooke Additives Limited | Manufacturing | 2018 |
| Brooke Biomass Limited | Wholesale & retail | 2015 |
| Brooke Energy (Engineering) Limited | Energy | 2016 |
| Brooke Energy (Exeter) Limited | Energy | 2016 |
| Brooke Energy (Jewells) Limited | Energy | 2016 |
| Brooke Energy (Winchester) Limited | Energy | 2016 |
| Brooke Energy Group Limited | Administrative & support | 2016 |
| Brooke Group Limited | Administrative & support | 2015 |
| Brookridge (Timber Products) Ltd | Wholesale & retail | 2012 |
| Brownes Farm Ltd | Agriculture & fishing | 2014 |
| Brownings Property Limited | Real estate | 2016 |
| Bsgsb Ltd | Professional & scientific | 2011 |
| Bububear Ltd | Wholesale & retail | 2020 |
| Buckland Athletic Football Club Limited | Arts & recreation | 2020 |
| Buddleford Broadoak Limited | Other services | 2013 |
| Buddleford Estates Limited | Agriculture & fishing | 1962 |
| Building Performance Modelling Ltd | Professional & scientific | 2020 |
| Bulpha Limited | Manufacturing | 2021 |
| Business Solutions (SW) Ltd | Administrative & support | 2023 |
| C H Vending Limited | Hospitality | 2024 |
| C J Weeks Limited | Construction | 1998 |
| C M Translation Services Limited | Administrative & support | 2005 |
| C&M Motor Sales Ltd | Wholesale & retail | 2026 |
| Cameron Gardens Holdings Limited | Financial services | 2023 |
| Canine Compass Limited | Education | 2024 |
| Capacitate Plus Limited | Other services | 2017 |
| Capien Group Ltd | Extraterritorial | 2020 |
| Caresmart Limited | Health & social care | 2008 |
| Casual Media Limited | Information & communication | 2019 |
| Category 1 Limited | Administrative & support | 2006 |
| Category 1 Support Ltd | Professional & scientific | 2010 |
| Catherine's Construction Ltd | Construction | 2026 |
| Cdsk Ltd | Wholesale & retail | 2017 |
| Chameleon Upholstery Ltd. | Manufacturing | 2020 |
| Charles People Consulting Limited | Professional & scientific | 2015 |
| Cheeky Trivia Ltd | Administrative & support | 2025 |
| Chelsea Artisans Contracts Ltd | Construction | 2014 |
| Chelsea Artisans Glass Ltd | Manufacturing | 2014 |
| Chelsea Artisans Holdings Ltd | Manufacturing | 2014 |
| Cherry Tree Exteriors Ltd | Construction | 2019 |
| Cherry Tree Interiors Ltd | Construction | 2019 |
| Chesterfield Property Developments Limited | Construction | 2025 |
| Children of the Forest Limited | Education | 2017 |
| Circularuk Ltd | Professional & scientific | 2020 |
| Clarke Farm Services Limited | Agriculture & fishing | 2018 |