| Ballycastle Developments Ltd | Professional & scientific | 2008 |
| Bambinos Caring Ltd | Households | 2016 |
| Bamd Ltd. | Manufacturing | 2009 |
| Banana Leaf Productions Ltd | Information & communication | 2018 |
| Banbury Glow Clinic Limited | Other services | 2022 |
| Banbury Tea Room Limited | Hospitality | 2021 |
| Banbury Vision Partners Ltd | Health & social care | 2026 |
| Barbican Demographics Limited | Professional & scientific | 2026 |
| Barbour Energy Limited | Energy | 2002 |
| Barker Property & Investments Limited | Real estate | 2022 |
| BARNES4BUSINESS Limited | Professional & scientific | 2010 |
| Barrett Global Ltd | Professional & scientific | 2019 |
| Barrie Plant & Sons Limited | Wholesale & retail | 2018 |
| Barry Avenue 1962 Limited | Extraterritorial | 2014 |
| Barsby Ltd | Information & communication | 2011 |
| Barwell Development Limited | Real estate | 2016 |
| Bassett Big Fish Ltd | Hospitality | 2020 |
| Baughan Interiors Limited | Construction | 2016 |
| Baumhaus Holdings Ltd | Real estate | 2019 |
| Baumhaus Ltd | Wholesale & retail | 2007 |
| Bayswood Construction Developments Limited | Construction | 2022 |
| Bayworth House Management Company Limited | Hospitality | 1998 |
| BC Dancesport Corporation Ltd | Education | 2019 |
| Bcloud Trading Limited | Wholesale & retail | 2018 |
| BCS Building Solutions Limited | Construction | 2013 |
| BDU Ltd | Arts & recreation | 2023 |
| BE Upstanding Marquees Limited | Other services | 2024 |
| BE Your Own Media Limited | Information & communication | 2020 |
| BEA Correa Jewellery Ltd | Wholesale & retail | 2025 |
| Beach Rest Properties Ltd | Real estate | 2015 |
| Beaky Plant Limited | Manufacturing | 2024 |
| Bear Media Services Ltd | Information & communication | 2019 |
| Bearden Investments Ltd | Real estate | 2025 |
| Beat Fitness Ltd | Arts & recreation | 2023 |
| Beaumont Construction Ltd | Construction | 2016 |
| Beauty and Bicester Ltd | Professional & scientific | 2021 |
| Beauty by Sophies Salon Ltd | Other services | 2021 |
| Bebarefaced Limited | Wholesale & retail | 2015 |
| Becentral Cars Ltd | Transport & logistics | 2020 |
| Beechstone Limited | Real estate | 2025 |
| Bees (Oxfordshire) Ltd | Real estate | 2010 |
| Belle Beauty and Hair Ltd | Other services | 2021 |
| Belle Hutt Personal Training Ltd | Other services | 2018 |
| Beloria Truffle Imports Ltd | Wholesale & retail | 2025 |
| Belvoir Kent Limited | Health & social care | 2022 |
| Bema Home Ltd | Real estate | 2025 |
| BEN Thomlinson Graphic Design Ltd. | Manufacturing | 2010 |
| Benchmark Developments (Oxon) Limited | Construction | 2021 |
| Benchmark Electricians Limited | Energy | 2018 |
| Beniel Vincent Ltd | Real estate | 2016 |
| Benizerob Ltd | Wholesale & retail | 2024 |
| Benjamin Michael Group Ltd | Financial services | 2026 |
| Benmp Ltd | Professional & scientific | 2021 |
| Benoist Associates Limited | Construction | 2017 |
| Bentham Black Limited | Information & communication | 2006 |
| Bentley Consulting Limited | Professional & scientific | 2008 |
| Bentley Designs (UK) Limited | Wholesale & retail | 1987 |
| Bentley Designs Investments Limited | Real estate | 2016 |
| Bentley Solutions Ltd | Wholesale & retail | 2025 |
| Beoakley Limited | Wholesale & retail | 2025 |
| Berazadi Holdings Limited | Financial services | 2021 |
| Berkeley Square Developments ARS Limited | Real estate | 2018 |
| Berkeley Square Developments Ashley Gardens Limited | Construction | 2020 |
| Berkeley Square Developments Dagenham Ltd | Construction | 2014 |
| Berkeley Square Developments Limited | Professional & scientific | 2012 |
| Berkeley Square Developments Real Estate Ltd | Professional & scientific | 2019 |
| Berkley Hetherington Consultancy Ltd | Administrative & support | 2023 |
| Berly Consulting Ltd | Professional & scientific | 2023 |
| Bernwode Forum Ltd | Other services | 2013 |
| Bernwode Schools Trust | Education | 2014 |
| Berol Collaborative Ltd | Real estate | 2024 |
| Berol Yard Limited | Real estate | 2020 |
| Berry Capital Ltd | Real estate | 2023 |
| Besford and Dinmont Freehold Ltd | Households | 2011 |
| Bespoke Builders Oxford Ltd | Construction | 2023 |
| Bespoke Denture Centre Limited | Health & social care | 2005 |
| Bespoke Timbercraft Limited | Agriculture & fishing | 2012 |
| Best Car Polish Ltd | Wholesale & retail | 2016 |
| Best Filipino Goods (BFG) UK Ltd | Wholesale & retail | 2021 |
| Best Foot F4WARD Ltd | Professional & scientific | 2022 |
| Best Technology Ltd | Professional & scientific | 2020 |
| BEST4PAINT Limited | Construction | 2023 |
| Beth Stewart Consulting Ltd | Other services | 2023 |
| Betta Healthcare Limited | Administrative & support | 2023 |
| Bexleyheath Dental Practice Limited | Health & social care | 2005 |
| Bexleyheath Holdings Limited | Health & social care | 2023 |
| Bexleyheath Orthodontics Limited | Health & social care | 2023 |
| Beyond Carbon Associates Ltd | Professional & scientific | 2022 |
| BI Medical Limited | Health & social care | 2020 |
| Biagio the Jewellers Limited | Wholesale & retail | 1999 |
| BIC IT Hub Ltd | Information & communication | 2017 |
| Bicester & District Gymnastics Club C.I.C. | Education | 2026 |
| Bicester and Whaddon Chase Limited | Arts & recreation | 2003 |
| Bicester Auto Electrics Limited | Wholesale & retail | 2006 |
| Bicester Boxing Club Ltd | Arts & recreation | 2020 |
| Bicester Builders Homes Limited | Construction | 2019 |
| Bicester Car & Van Rental Limited | Administrative & support | 2011 |
| Bicester Car Surgery Limited | Wholesale & retail | 2010 |
| Bicester Care and PA Limited | Health & social care | 2019 |
| Bicester Cars (Oxon) Ltd | Transport & logistics | 2024 |