| Beehive (Frome) Limited | Real estate | 2003 |
| Belgrave & Denbigh RTM Company Ltd | Real estate | 2015 |
| Belmont Court Management Limited | Extraterritorial | 2010 |
| BEN Jolliffe Limited | Information & communication | 2009 |
| BEN Massey Facades Ltd | Construction | 2022 |
| Benoit Clavet Food Limited | Hospitality | 2025 |
| Berkeley Hall Limited | Professional & scientific | 2018 |
| Bespoke Glass, Splashbacks and Mirrors Ltd | Manufacturing | 2022 |
| Between Takes Ltd | Information & communication | 2025 |
| BH Smith Accountancy Ltd. | Professional & scientific | 1995 |
| BH Smith Holding Ltd | Professional & scientific | 2018 |
| Bill Farr Video Ltd | Information & communication | 2020 |
| Binksify Limited | Information & communication | 2025 |
| Biomeq Ltd | Information & communication | 2025 |
| Biznus Payroll Limited | Administrative & support | 2008 |
| Black Bird/Red Rose Productions | Arts & recreation | 1997 |
| Black Labrador Ltd | Information & communication | 2014 |
| Black Swan Arts Ltd | Arts & recreation | 1985 |
| Black VEN Distillery Limited | Manufacturing | 2019 |
| Blindmans Brewery Limited | Manufacturing | 2004 |
| Bloomray Consulting Limited | Information & communication | 2022 |
| Blue Millenia Films Ltd | Information & communication | 2025 |
| Blue Rock Films Limited | Information & communication | 2017 |
| Blue School of Motoring Limited | Education | 2004 |
| Bluekey Property Ltd | Households | 2025 |
| BM Lettings Limited | Real estate | 2023 |
| BMT School of Music Ltd | Education | 2021 |
| Boardgamesbren Ltd | Arts & recreation | 2022 |
| Boho Fashions Ltd | Wholesale & retail | 2014 |
| Bold & Bright Limited | Professional & scientific | 2020 |
| Bosky Trees Ltd | Professional & scientific | 2022 |
| Brandjay Consulting Limited | Professional & scientific | 2011 |
| Brea Hill Advisory Ltd | Administrative & support | 2019 |
| Brewbitz Limited | Wholesale & retail | 2021 |
| Brewis ENG Ltd | Professional & scientific | 2023 |
| Brian Allsop Carpet & Flooring Ltd | Wholesale & retail | 2000 |
| Briden Consulting Ltd | Information & communication | 2025 |
| Bright Ideas Work Ltd | Administrative & support | 2022 |
| Brimble Elton Enterprises Limited | Other services | 2017 |
| Britebeat Ltd | Information & communication | 2021 |
| Britewire Ltd | Information & communication | 2016 |
| Broadies Supplements Limited | Manufacturing | 2019 |
| Broardway 1965 Limited | Extraterritorial | 2013 |
| Brontë Doidge Trenouth Planning Limited | Professional & scientific | 2025 |
| Brontë Doidge Trenouth Property and Developments Limited | Extraterritorial | 2024 |
| Brooks & Daughters Ltd | Construction | 2018 |
| Brooks Brothers Developments (West Sussex) Limited | Real estate | 2003 |
| Brown & Vautier Limited | Professional & scientific | 2014 |
| Brownsea Island PUB Company Ltd | Hospitality | 2019 |
| Bruler Limited | Construction | 2014 |
| Bryn Alden Limited | Construction | 2008 |
| BSG (Frome) Limited | Construction | 2005 |
| BTA Studios GR1 Limited | Information & communication | 2016 |
| BTR Fabrications Ltd. | Manufacturing | 2019 |
| Btrack Solutions Limited | Manufacturing | 2004 |
| Bubbles Realty Ltd | Real estate | 2012 |
| Build Bespoke Construction Limited | Construction | 2022 |
| Building Balance Limited | Health & social care | 2023 |
| Bullus Construction Limited | Construction | 2021 |
| Burj Associates Ltd | Health & social care | 2012 |
| Burlands House Management Company Limited | Real estate | 2007 |
| Burnards Funeral Service Limited | Other services | 2017 |
| Burnards Granite Ltd | Wholesale & retail | 2021 |
| Business Sense Coaching Ltd. | Administrative & support | 2013 |
| Butterfly Events Ltd | Arts & recreation | 2026 |
| BY the Byre Holidays Ltd | Hospitality | 2015 |
| Byron Smith Homes Ltd | Real estate | 2024 |
| C & L Pearce Joinery Ltd | Construction | 2022 |
| C & D Services (Frome) Ltd | Administrative & support | 2015 |
| C H Contracting (South West) Limited | Construction | 2006 |
| C H I South West Ltd | Construction | 2014 |
| C Sharp Media LLP | | 2023 |
| C. F. Contracting Limited | Construction | 2013 |
| CA20 Ltd | Information & communication | 2018 |
| Cafe LA Strada Ltd | Hospitality | 2005 |
| Cafe Pronto Frome Limited | Hospitality | 2022 |
| Call ME Ishmael Ltd | Professional & scientific | 2023 |
| Camp Chic Limited | Administrative & support | 2023 |
| Campex Limited | Wholesale & retail | 2025 |
| Capetti Comms Ltd | Information & communication | 2024 |
| Caradox Limited | Information & communication | 2020 |
| Caravan Arts London C.I.C. | Education | 2019 |
| Carbon Conscious Limited | Construction | 2007 |
| Carbon Managers Solutions Ltd | Professional & scientific | 2020 |
| Cardisio UK Limited | Information & communication | 2022 |
| Caring Connections Frome Ltd | Health & social care | 2025 |
| Carisbrooke Mansions Freehold Limited | Households | 2022 |
| Carl Price Ltd | Wholesale & retail | 2010 |
| Caroline Fosbury Public Relations Limited | Professional & scientific | 2005 |
| Carpe Diem Ents Ltd | Arts & recreation | 2015 |
| Carroll Developments Ltd | Construction | 2020 |
| CAS' Classics Limited | Wholesale & retail | 2022 |
| Caseportal Limited | Professional & scientific | 2016 |
| Caspar White Ltd | Construction | 2024 |
| Castle Accountancy Services Limited | Professional & scientific | 2005 |
| Castle Mews (Trowbridge) Management Company Limited | Households | 2002 |
| Catalyst Collective Limited | Administrative & support | 1992 |
| Catcott Developments Ltd | Construction | 2023 |
| Catley Brothers Limited | Extraterritorial | 2013 |
| Catley Chilled Foods Ltd | Hospitality | 2013 |