| Bentley Drivers Club Touring Limited | Arts & recreation | 2013 |
| Bentley Facilitates Solutions Limited | Administrative & support | 2025 |
| Benzaiten Limited | Professional & scientific | 2018 |
| Ben’S Sandwich & Coffee House Ltd | Hospitality | 2026 |
| Berkeley Heath Limited | Hospitality | 2021 |
| Berridge Farms Limited | Extraterritorial | 2012 |
| Berry’S Meadow Management Company Ltd | Households | 2019 |
| BES Couriers Limited | Transport & logistics | 2022 |
| Besley Heritage Ltd | Wholesale & retail | 2024 |
| Bespoke Envelope Solutions Ltd | Professional & scientific | 2025 |
| Bespoke Group Ltd | Professional & scientific | 2020 |
| Best Advisory Ltd | Professional & scientific | 2026 |
| Beta Haven Care Ltd | Public administration | 2024 |
| Bethany Joy Ltd | Administrative & support | 2018 |
| Better Training Ltd | Other services | 2008 |
| Betts Fine Foods Ltd | Wholesale & retail | 2025 |
| Bevo Transport Ltd | Transport & logistics | 2025 |
| Beyond 49 Ltd | Professional & scientific | 2023 |
| Beyond Business School Consulting Ltd | Professional & scientific | 2012 |
| Beyond Taste Foods Ltd | Wholesale & retail | 2026 |
| BF CS Limited | Professional & scientific | 2000 |
| BFB Banbury Limited | Hospitality | 2025 |
| BG Construction Consultants Limited | Professional & scientific | 2022 |
| BG Team Ltd | Transport & logistics | 2018 |
| Bg-Graspointner UK Ltd | Manufacturing | 2019 |
| Bgcollections Ltd | Manufacturing | 2023 |
| BGK Ventures Limited | Administrative & support | 2005 |
| Bgmc Limited | Households | 2010 |
| Bianca Roxana Limited | Administrative & support | 2022 |
| Bicester Estates Limited | Real estate | 2022 |
| Bicester Mobile Mechanic Ltd | Wholesale & retail | 2025 |
| Bicester Pipe Mechanical Services Ltd | Construction | 2012 |
| Bicester Property Unit 1 Limited | Financial services | 2025 |
| Bicester Property Unit 15 Limited | Real estate | 2025 |
| Big Human Theatre Ltd | Arts & recreation | 2014 |
| Big Motion Ltd | Information & communication | 2025 |
| Big Yellow Penguin Ltd | Professional & scientific | 2021 |
| Bigai Ltd | Information & communication | 2024 |
| Bigbell Limited | Hospitality | 2020 |
| Bike Box Company (UK) LLP | | 2017 |
| Bilchev Delivery Ltd | Transport & logistics | 2017 |
| BILLION2TRILLION Ltd | Financial services | 2024 |
| Bimbiz Ltd | Information & communication | 2023 |
| Bio-Life International Limited | Manufacturing | 2006 |
| Biomergy Ltd | Professional & scientific | 2024 |
| Biotech Drains Solutions Ltd | Construction | 2025 |
| Biotech Heating Services Limited | Professional & scientific | 2021 |
| Birdy Blacksmiths Ltd | Manufacturing | 2026 |
| Bishop's Artisan Kitchen Ltd | Hospitality | 2023 |
| Bishops Gate Developments Ltd | Construction | 2017 |
| Bishops Gate Training Ltd | Education | 2019 |
| Bitter Pill Apparel Ltd | Wholesale & retail | 2021 |
| Bittern Consulting Limited | Professional & scientific | 2003 |
| Bizword Limited | Professional & scientific | 2006 |
| BKC Properties Ltd | Real estate | 2025 |
| Black and Red Music Ltd | Arts & recreation | 2024 |
| Black Diamond Electrical Services Ltd | Construction | 2017 |
| Black Heron Headwear Limited | Wholesale & retail | 2024 |
| Black LAB Pubs Ltd | Hospitality | 2013 |
| Blackburn & Co. Holdings Limited | Financial services | 2022 |
| Blackdown Services Limited | Professional & scientific | 2008 |
| Blackstone 1970 Ltd | Real estate | 2019 |
| Blackstone Plumbing & Heating Ltd | Construction | 2023 |
| Blackwell Contract Build Ltd | Construction | 2016 |
| Blank Canvas Campers Ltd | Wholesale & retail | 2025 |
| Blank Page Events Limited | Administrative & support | 2023 |
| Blbk Ltd | Real estate | 2025 |
| Bldverselgo Ltd | Wholesale & retail | 2025 |
| Blencowes Logistics Limited | Transport & logistics | 2025 |
| Blencowe’S Hospitality Limited | Manufacturing | 2020 |
| Blend Communication Ltd | Professional & scientific | 2024 |
| Blenheim Bookkeeping & Accountancy Services Limited | Professional & scientific | 2019 |
| Bleuelm Limited | Professional & scientific | 2025 |
| Block Space Developments Limited | Construction | 2020 |
| Bloom Logistics Ltd | Transport & logistics | 2024 |
| Bloom Logistics Solutions Ltd | Transport & logistics | 2026 |
| Blooming Marvellous Garden Services Limited | Administrative & support | 2025 |
| Bloxham Computers Ltd | Other services | 2011 |
| Bloxham CRT Management Company Ltd | Households | 2026 |
| Bloxham Enterprises Limited | Hospitality | 1987 |
| Bloxham Mill Limited | Administrative & support | 1999 |
| Bloxham Property Services Ltd | Real estate | 2017 |
| Bloxham School Limited | Education | 1999 |
| BLR Accountancy Services Ltd | Professional & scientific | 2014 |
| Blue Heart Gaming Ltd | Wholesale & retail | 2023 |
| Blue Horse Properties Ltd | Real estate | 2024 |
| Blue Isle Solutions Limited | Information & communication | 2024 |
| Blue Spires Solutions Limited | Information & communication | 2010 |
| Bluebird Project Managment Ltd | Information & communication | 2012 |
| Bluebird RE Limited | Real estate | 2023 |
| Blueharp Consultants Ltd | Professional & scientific | 2016 |
| Bluehouse Digital Limited | Wholesale & retail | 2025 |
| Bluemotion Group Ltd | Hospitality | 2017 |
| Bluepoint Cargo Services Ltd | Wholesale & retail | 2025 |
| Blueprint Mechanical Services Limited | Construction | 2017 |
| Bluestone Logistics Ltd | Transport & logistics | 2026 |
| Blythorne Estates Europe Limited | Wholesale & retail | 2023 |
| BM Fasteners Limited | Extraterritorial | 2019 |
| Bmarc MOT Ltd | Wholesale & retail | 2026 |
| BMD Couriers Limited | Transport & logistics | 2025 |