| Bolakale Ltd | Health & social care | 2022 |
| Boldstep Ventures Ltd | Information & communication | 2007 |
| Bolger Guest Experience Ltd | Hospitality | 2026 |
| Bolt Limited | Arts & recreation | 2017 |
| Bond & Co Property Development Ltd | Construction | 2019 |
| Bonner & Milner Limited | Construction | 2007 |
| Book the Cotswolds Ltd | Administrative & support | 2024 |
| Books and Numbers Limited | Professional & scientific | 2003 |
| Botcherby UK Limited | Professional & scientific | 2017 |
| Botree Homes 1 Ltd | Real estate | 2019 |
| BOURNE9 Ltd | Professional & scientific | 2017 |
| Boward Tree Surgery (Oxford) Limited | Agriculture & fishing | 1998 |
| Bower & Bailey LLP | | 2010 |
| Bowman Leisure Limited | Arts & recreation | 1994 |
| Boxen Ltd | Information & communication | 2021 |
| Boxwood (Southern) Limited | Real estate | 2015 |
| Boxwood Kitchens Ltd | Wholesale & retail | 2021 |
| Boyd Heating Services Limited | Construction | 2023 |
| Boyett & Co Holdings Limited | Financial services | 2025 |
| BP Dyer Services Ltd | Other services | 2021 |
| Bradley Brickwork Ltd | Construction | 2023 |
| Brain & Minchin Investments Limited | Financial services | 2015 |
| Brain & Minchin Limited | Construction | 2013 |
| Brain & Minchin Properties Limited | Real estate | 2015 |
| Brainshire Holdings Limited | Financial services | 2026 |
| Bramble Cole Developments Ltd | Real estate | 2020 |
| Brambleside Flooring & Interiors Limited | Construction | 2025 |
| Brand Leadership Group Ltd. | Professional & scientific | 2010 |
| Brandcast Media Limited | Professional & scientific | 1999 |
| Branded by Fashion Ltd | Information & communication | 2019 |
| Branded Revival Ltd | Wholesale & retail | 2025 |
| Branigan Interactive Ltd | Information & communication | 2004 |
| Bread and Honey Events Ltd | Administrative & support | 2016 |
| Brewzil Ltd | Wholesale & retail | 2026 |
| Brick Cafe Ltd | Hospitality | 2026 |
| Bridge Sea Ltd | Information & communication | 2018 |
| Bridge Special Effects Ltd | Administrative & support | 2003 |
| Bridgeport Forest Products Ltd | Wholesale & retail | 2006 |
| Bridges Cross-Cultural Education Services Limited | Education | 2017 |
| Bright Blue Box Self Storage Limited | Wholesale & retail | 2025 |
| Bright Cold Day Films Limited | Extraterritorial | 2012 |
| Bright Creative Marketing Limited | Professional & scientific | 2010 |
| Bright Future Family Ltd | Agriculture & fishing | 2024 |
| Bright Future Solar Ltd | Construction | 2022 |
| Bright Pink Limited | Construction | 2018 |
| Brighthampton Court Management Company Limited | Households | 2008 |
| Brighthampton Trading Limited | Households | 2016 |
| Brill Sawmills Ltd | Wholesale & retail | 2006 |
| Brindley Consultants Limited | Professional & scientific | 2020 |
| Brisa Ventures Ltd | Hospitality | 2024 |
| Britannia Antiques Limited | Real estate | 1987 |
| Britbore Limited | Wholesale & retail | 2026 |
| British Motor Heritage Limited | Manufacturing | 1929 |
| BRJ Engineering Limited | Manufacturing | 2006 |
| Brndxl Ltd | Wholesale & retail | 2021 |
| Broadleaf Services Limited | Construction | 2017 |
| Brocklebank Engineering Services Ltd | Administrative & support | 2019 |
| Bromag Engineering Company (Witney) Limited | Real estate | 1956 |
| Bromag Structures Limited | Construction | 1967 |
| Brompton 35 Limited | Financial services | 2014 |
| Bromsgrove (Faringdon) Management Limited | Households | 2024 |
| Bronsens Accountants Limited | Professional & scientific | 2014 |
| Bronsens Financial Services Limited | Financial services | 2008 |
| Bronsens LLP | | 2012 |
| Bronsens Payroll Services Ltd | Professional & scientific | 2013 |
| Bronsens Probate Services Limited | Professional & scientific | 2021 |
| Bronsens Team Counts Limited | Professional & scientific | 2019 |
| Brook Street Holdings Limited | Other services | 2019 |
| Brookover Barn SPV Ltd | Construction | 2023 |
| Brotherton Property Solutions Ltd | Households | 2024 |
| Browns Accountancy & Taxation Ltd | Professional & scientific | 2010 |
| Bruce Eastabrook Plumbing and Heating Ltd | Construction | 2007 |
| Brunton Property Ltd | Households | 2019 |
| Bryce Media Ltd | Information & communication | 2011 |
| Bsam Auto Sales Limited | Wholesale & retail | 2026 |
| Btpm Consulting Limited | Professional & scientific | 2025 |
| Bubbal Beauty Parlour Ltd | Other services | 2023 |
| Bucklebury Group Limited | Professional & scientific | 2016 |
| Buckthorn Online Limited | Wholesale & retail | 2020 |
| Budden Consultancy Limited | Professional & scientific | 2022 |
| Buddha Connect Limited | Administrative & support | 2017 |
| BUG Design Ltd | Professional & scientific | 2025 |
| Builders EDE Limited | Construction | 1963 |
| Building Character Ltd | Construction | 2008 |
| Building Plots Trader Ltd | Construction | 2020 |
| Buildscape Ltd | Wholesale & retail | 2016 |
| Buildsure International Ltd | Professional & scientific | 2026 |
| Buitech Ltd | Information & communication | 2014 |
| Bull Luxury Homes Ltd | Construction | 2024 |
| Bull Luxury Living Ltd | Real estate | 2016 |
| Burcot House Management Limited | Households | 1998 |
| Bureau Office Limited | Real estate | 2012 |
| Burford Hill Residents Limited | Households | 2011 |
| Burgers and Brews Catering Ltd | Hospitality | 2024 |
| Burgers and Brews Truck Ltd | Hospitality | 2026 |
| Burnell Leisure Ltd | Arts & recreation | 2022 |
| Burnell Real Estate Ltd | Real estate | 2021 |
| Burrows & Edwards (Accountants) Limited | Professional & scientific | 2020 |
| Burrows & Edwards Limited | Professional & scientific | 2002 |
| Burwell Farm (West) Management Company Limited | Hospitality | 1988 |