| B.T.E Auto Repairs (Evesham) Limited | Wholesale & retail | 2012 |
| B2CARE Ltd | Health & social care | 2024 |
| B3TF Limited | Wholesale & retail | 2025 |
| BA Couriers (Glos) Ltd | Transport & logistics | 2023 |
| Babtac Limited | Other services | 2008 |
| Babygenic Ltd | Other services | 2019 |
| Bacc Room CIC | Wholesale & retail | 2025 |
| Backraze Ltd | Other services | 2021 |
| Backswing Golf Ltd | Hospitality | 2026 |
| Badgers Meadow Associates Limited | Administrative & support | 2013 |
| Badminton Developments Limited | Real estate | 2018 |
| Badzz Ltd | Information & communication | 2024 |
| Bafcrown Computers Limited | Information & communication | 1988 |
| BAH Motors Ltd | Wholesale & retail | 2019 |
| Bahar Transport Limited | Transport & logistics | 2024 |
| BAI Construction Ltd | Construction | 2009 |
| BAI Developments Limited | Real estate | 2024 |
| Bailey Plastering & Rendering Ltd | Construction | 2025 |
| Bake Code Ltd | Information & communication | 2023 |
| Bakes, Shakes 'N' Cakes Ltd | Hospitality | 2018 |
| Bakkah Software Engineering & Research Ltd | Information & communication | 2018 |
| Bako Four Sisters Healtcare Limited | Health & social care | 2025 |
| Ball Engineering Services (Lydney) Limited | Information & communication | 2010 |
| Ball Properties Limited | Real estate | 2006 |
| Balloon Occasions Decor & More Ltd | Wholesale & retail | 2021 |
| BALLOONS2BUSINESS Ltd | Information & communication | 2022 |
| Ballsy Ltd | Wholesale & retail | 2021 |
| Ballymacaw Limited | Hospitality | 2009 |
| Balmy Care Services Limited | Health & social care | 2024 |
| BAM LET Limited | Real estate | 2020 |
| Bambi's Childcare Ltd | Education | 2014 |
| Bamboo Rose LLC | | 2016 |
| Bamel Way Management Company Limited | Real estate | 2006 |
| Banana Bar Company Limited | Hospitality | 2021 |
| Bancroft Land Limited | Extraterritorial | 2009 |
| Bankside Developments Ltd | Construction | 2007 |
| Banndar Trading Limited | Wholesale & retail | 2022 |
| Banneret Ltd | Wholesale & retail | 2025 |
| Baptist Insurance Company PLC the | Financial services | 1905 |
| Baptist Insurance Services Limited | Extraterritorial | 2011 |
| Baptist Support Services Limited | Administrative & support | 2010 |
| Bar Zero Gloucester Limited | Hospitality | 2025 |
| Barakahsaleh Trading Ltd | Wholesale & retail | 2023 |
| Barbelles Training Ltd | Arts & recreation | 2020 |
| Barbera Fleet Installations Ltd | Construction | 2024 |
| Barbetta Capital Limited | Real estate | 2024 |
| Barbie's Unisex Hair & Beauty Salon Ltd | Other services | 2025 |
| Bare Theory Ltd | Wholesale & retail | 2026 |
| Barghest Research Group Limited | Information & communication | 2025 |
| Barichfred Limited | Health & social care | 2013 |
| Bark & Call Ltd | Other services | 2022 |
| Barkeley Barks Doggy Daycare Ltd | Other services | 2022 |
| Barker and Company (Holding) Limited | Wholesale & retail | 2024 |
| Barker and Company (Timber Agents) Limited | Wholesale & retail | 1985 |
| Barking MAD K9S Ltd | Arts & recreation | 2022 |
| Barn and Plant Hire Limited | Real estate | 2024 |
| Barnfields Paraplanning Limited | Financial services | 2025 |
| Barnhill Rentals Limited | Administrative & support | 2025 |
| Barnpear Consultants Ltd | Construction | 2018 |
| Barnwood & District Bowling & Tennis Ground Company Limited | Arts & recreation | 1922 |
| Barnwood Agencies Limited | Wholesale & retail | 2011 |
| Barnwood Construction Limited | Construction | 2020 |
| Barnwood Fitness Ltd | Arts & recreation | 2017 |
| Barnwood Holdings Limited | Administrative & support | 2020 |
| Barnwood Interiors Limited | Construction | 2018 |
| Barnwood Plumbing & Heating Limited | Construction | 2004 |
| Barnwood United AFC Limited | Arts & recreation | 2023 |
| Baroveca Limited | Transport & logistics | 2016 |
| Barqcatering Limited | Hospitality | 2026 |
| Barrage Electrical Ltd | Construction | 2026 |
| Barrett Tree Service Limited | Agriculture & fishing | 2010 |
| Barrington Contractors Limited | Construction | 2016 |
| Barron's Building Services Ltd | Construction | 2021 |
| Barry Jeffrey Transport Limited | Transport & logistics | 2008 |
| Barry Robinson Mortgage Advisor Ltd | Financial services | 2018 |
| Bartioad Ltd | Professional & scientific | 2024 |
| Barton and Tredworth Developments Limited | Hospitality | 1997 |
| Barton Cold-Form (UK) Limited | Manufacturing | 2009 |
| Barton Gloster Management Company Limited | Households | 1972 |
| Baruch Homes Ltd | Real estate | 2022 |
| Barworks (Kings Cross) Limited | Hospitality | 2008 |
| Barworks (Soho) Limited | Hospitality | 1994 |
| Barworks Limited | Administrative & support | 1999 |
| Barworks London 1 Ltd | Hospitality | 2022 |
| Barworks London 2 Ltd | Hospitality | 2022 |
| Barworks London 3 Ltd | Hospitality | 2022 |
| Barworks PUB Group Limited | Hospitality | 2020 |
| Baryl Whitebib Limited | Real estate | 2025 |
| Basaw Cleaning Ltd | Administrative & support | 2025 |
| Basehorizon Ltd | Information & communication | 2026 |
| Bashir Transport Solutions Ltd | Transport & logistics | 2021 |
| Basil Freeman and SON Transport Limited | Transport & logistics | 2006 |
| Basker Leitch Limited | Professional & scientific | 1999 |
| Bastion Flats Limited | Real estate | 2017 |
| Bastion House Ltd | Real estate | 2015 |
| Batch and Bespoke Limited | Professional & scientific | 2023 |
| Bates Design Solutions Ltd | Professional & scientific | 2025 |
| Bath Road Butchers Limited | Wholesale & retail | 2012 |
| Batsford Garden Centre Limited | Wholesale & retail | 2022 |
| Batsoft Limited | Information & communication | 2017 |