| Belmont Barbers Limited | Administrative & support | 2017 |
| Bems (Controls) Limited | Professional & scientific | 2008 |
| BEN Argent Kitchens Limited | Manufacturing | 2019 |
| BEN Elliott Coaching Limited | Education | 2019 |
| BEN Kane Limited | Information & communication | 2012 |
| BEN Pritchard Consulting Limited | Administrative & support | 2022 |
| BEN Slade Grain Handling Systems Ltd | Professional & scientific | 2018 |
| Benash Farms Limited | Real estate | 1978 |
| Benchmark Associates Limited | | 1990 |
| Benchmark+ Consultancy Limited | Professional & scientific | 2024 |
| Bendac Technology Ltd | Extraterritorial | 2018 |
| Bendar Ltd | Financial services | 2026 |
| Benson Capital Ltd | Professional & scientific | 2018 |
| Bereavement Guide Ltd | Information & communication | 2026 |
| Berkley Place Limited | Real estate | 2023 |
| Berkley Square Mortgage Clients Limited | Financial services | 1999 |
| Berkley Square Private Clients Limited | Administrative & support | 2007 |
| Bespoke Caravan Co Ltd | Manufacturing | 2012 |
| Bespoke Family Limited | Other services | 2018 |
| Best at Print Ltd | Manufacturing | 2015 |
| BESTODDS247 Ltd | Information & communication | 2023 |
| BEX Holdings Limited | Financial services | 2015 |
| Beyond Expectation Education Ltd | Professional & scientific | 2025 |
| Beyond Normal Consult Ltd | Professional & scientific | 2023 |
| Beyond Study Consultancy Ltd | Administrative & support | 2026 |
| BGA Consulting Services Ltd | Other services | 2024 |
| BGS Healthcare Ltd | Health & social care | 2014 |
| BH App Development Limited | Arts & recreation | 2016 |
| BHR Limited | Real estate | 2024 |
| Bibury Homes Limited | Construction | 2020 |
| BID Strategy Ltd | Professional & scientific | 2026 |
| Biddestone Cricket Club Limited | Arts & recreation | 2024 |
| Biddestone Village Hall and Recreation Trust | Arts & recreation | 2015 |
| Big Bull Storage Limited | Transport & logistics | 2021 |
| Big Data Exchange X Ltd | Wholesale & retail | 2021 |
| Bigriggray Ltd | Professional & scientific | 2024 |
| Bill Amberg Limited | Arts & recreation | 1994 |
| Bill and Bens Hydroworld Ltd | Wholesale & retail | 2012 |
| Billycock EYE Care Limited | Wholesale & retail | 2011 |
| Billycock Homes Limited | Construction | 2004 |
| Billycock Takeaway Limited | Hospitality | 2023 |
| Binder Forge Ltd | Information & communication | 2025 |
| Binks Hair Studio Ltd | Other services | 2019 |
| Biodivide Limited | Professional & scientific | 2013 |
| Biorhythms.Exercise.Nutrition. Ltd | Education | 2023 |
| Birdies Caddying Ltd | Arts & recreation | 2017 |
| Birdlymes Farm Ltd | Agriculture & fishing | 2014 |
| Birdy Design Limited | Administrative & support | 2013 |
| Bishop Electrical Ltd | Construction | 2009 |
| Bishops Court Management (Plots 88-93) Limited | Real estate | 1992 |
| Bishops Upholstery Limited | Wholesale & retail | 2003 |
| BK Traders Limited | Wholesale & retail | 2014 |
| Bk&M Limited | Real estate | 2019 |
| BKY Coaching Limited | Arts & recreation | 2023 |
| Black Cherry Comms Limited | Information & communication | 2016 |
| Black Diamond Stud Ltd | Other services | 2021 |
| Black Dog Buildings Limited | Construction | 2012 |
| Black Dog Turnpike Ltd | Real estate | 2012 |
| Black Duck Projects Limited | Information & communication | 2014 |
| Black Hole Storage Limited | Other services | 2007 |
| Black Rock Security Solutions Ltd | Professional & scientific | 2025 |
| Black Stripe Consultancy Ltd | Other services | 2024 |
| Black Swan Studios Ltd | Information & communication | 2026 |
| Blackbridge Motor Company Ltd | Wholesale & retail | 2024 |
| Blackmore Building Contractors Limited | Construction | 2004 |
| Blackscalr Ltd | Professional & scientific | 2026 |
| Blade (Chippenham) Limited | Administrative & support | 2002 |
| Blakehill Healthcare Limited | Health & social care | 2015 |
| Blakehill Logistics Limited | Transport & logistics | 2021 |
| Blamire Property Ltd | Hospitality | 2023 |
| Blaze Design Limited | Real estate | 2002 |
| Blbp Consulting Ltd | Information & communication | 2025 |
| Blitzed Cleaning Solutions Ltd | Administrative & support | 2025 |
| Bloomfield Financial Consultancy Ltd | Professional & scientific | 2010 |
| Blue and Green Partnership Limited | Professional & scientific | 2023 |
| Blue Biometrics Limited | Information & communication | 2023 |
| Blue Cloud Healthcare Consulting Ltd | Administrative & support | 2013 |
| Blue Feather Spirit Limited | Other services | 2018 |
| Blue FOX Planning Ltd | Professional & scientific | 2020 |
| Blue Gamma Ltd | Information & communication | 2021 |
| Blue Hollow Ltd | Wholesale & retail | 2026 |
| Blue Loch Consultancy Ltd | Professional & scientific | 2018 |
| Blue Marmoset Ltd | Information & communication | 2018 |
| Blue Stone Home and Garden Ltd | Other services | 2003 |
| Blue Tree Communications Ltd | Wholesale & retail | 2017 |
| Blue Tree IT Limited | Information & communication | 2016 |
| Bluebell Kempsford Ltd | Financial services | 2024 |
| Bluebell Social Media Limited | Administrative & support | 2018 |
| Bluebird Aviation Services Ltd | Wholesale & retail | 2021 |
| Bluedot Express Logistics Limited | Transport & logistics | 2006 |
| Bluefield Studios Limited | Information & communication | 2025 |
| Blueleaf Property Limited | Households | 2016 |
| Bluenergy Limited | Professional & scientific | 2008 |
| Blueworks Ltd | Information & communication | 2012 |
| Boarstall Meats Limited | Manufacturing | 2023 |
| Boast Limited | Information & communication | 2006 |
| BOB Ritchie Limited | Manufacturing | 1999 |
| Bobbinsridge Ltd | Administrative & support | 2013 |
| Bodman Geoscience Ltd | Mining & quarrying | 2019 |
| Bodmans Marshfield Management Company Limited | Hospitality | 1986 |