| Beef Box Events Ltd | Hospitality | 2026 |
| Bekir KB Ltd | Hospitality | 2024 |
| Bela Szekely Engineering Limited | Administrative & support | 2017 |
| Benarc Limited | Wholesale & retail | 2024 |
| Benu Homes Ltd | Financial services | 2025 |
| Bernard Agricultural Limited | Professional & scientific | 1994 |
| Bernwood Farm Limited | Agriculture & fishing | 2024 |
| Bespoke Education Tutoring Ltd | Education | 2024 |
| Best Shift Ltd | Hospitality | 2019 |
| Bfcn Ltd | Financial services | 2024 |
| Bicester Kitchen Designs Ltd | Construction | 2019 |
| Big Ticket Asset Finance Limited | Financial services | 2022 |
| Bill Gwynne Motorsport Limited | Wholesale & retail | 1996 |
| Bill Mason Ltd | Wholesale & retail | 2007 |
| Binbrook House Limited | Real estate | 2025 |
| Biometrist Ltd | Information & communication | 2024 |
| Birlik KB Limited | Hospitality | 2026 |
| BIT by Byte Limited | Information & communication | 2001 |
| Bits N Bobs That YOU Forgot Limited | Hospitality | 2017 |
| Black & White Technologies Ltd | Agriculture & fishing | 2007 |
| Black INK Inc Limited | Professional & scientific | 2023 |
| Black INK Projects Ltd | Professional & scientific | 2019 |
| Black INK Property Limited | Real estate | 2023 |
| Black Lilly Ltd | Professional & scientific | 2017 |
| Blackpit Estates Limited | Arts & recreation | 2024 |
| Blencowe & Partners Limited | Professional & scientific | 2010 |
| Blencowes AJP Limited | Professional & scientific | 2021 |
| Blencowes Estates Limited | Real estate | 2024 |
| Blencowes of Brackley Limited | Financial services | 2021 |
| Blencowes RB Limited | Professional & scientific | 2021 |
| Blissful Bathing Solutions Ltd | Wholesale & retail | 2023 |
| Bloor Aviation Limited | Manufacturing | 2025 |
| Bloqq Property Management Limited | Households | 2026 |
| Blue Spear Software Limited | Information & communication | 2014 |
| Bluewings Media Limited | Information & communication | 2021 |
| Bmrp Ltd | Administrative & support | 2009 |
| Bobcat Couriers Ltd | Transport & logistics | 2021 |
| Bobcat Digital Ltd | Manufacturing | 2013 |
| Bonce PR Ltd | Professional & scientific | 2012 |
| Bonifacio Logistics Ltd | Transport & logistics | 2026 |
| Bonsor Property Ltd | Real estate | 2025 |
| Bowmotive Limited | Wholesale & retail | 2013 |
| Bowtrac Ltd | Transport & logistics | 2026 |
| Boxsta Ltd | Wholesale & retail | 2023 |
| Brackbridge Limited | Professional & scientific | 2018 |
| Brackley & Towcester PCN Limited | Health & social care | 2022 |
| Brackley Bar and Grill Ltd | Hospitality | 2020 |
| Brackley Business Association Ltd | Other services | 2025 |
| Brackley Chinese Limited | Hospitality | 2019 |
| Brackley Electrical Limited | Construction | 2016 |
| Brackley Fields Care Ltd | Health & social care | 2012 |
| Brackley Groundworks Limited | Construction | 2014 |
| Brackley Gymnastics School Ltd | Arts & recreation | 2025 |
| Brackley Hand Car Wash Ltd | Other services | 2017 |
| Brackley Investigation Services Limited | Information & communication | 2015 |
| Brackley Labels Limited | Manufacturing | 1978 |
| Brackley Pizza Limited | Hospitality | 2026 |
| Brackley Primary Care Services Limited | Health & social care | 2021 |
| Brackley Recycling Ltd | Water & waste | 2023 |
| Brackley Removal Services Ltd | Transport & logistics | 2025 |
| Brackley Rewinds Limited | Manufacturing | 2011 |
| Brackley Rugby Union Football Club Limited | Other services | 2009 |
| Brackley Self Drive Ltd | Administrative & support | 2024 |
| Brackley Self Storage Limited | Transport & logistics | 2024 |
| Brackley Self Storage Solutions Ltd | Transport & logistics | 2023 |
| Brackley Spice Ltd | Hospitality | 2020 |
| Brackley Steam Park Academy Ltd | Education | 2024 |
| Brackley Van and Car Rental Limited | Administrative & support | 2025 |
| Brackley Wellbeing Centre Ltd | Health & social care | 2025 |
| Brackley's Chatty Parrot Ltd | Hospitality | 2025 |
| Brae Little Ltd | Manufacturing | 2023 |
| Brawn Engineering Ltd | Manufacturing | 2024 |
| Briar Walk Freehold Limited | Real estate | 2020 |
| Brickfield Acquisitions Limited | Real estate | 2021 |
| Brickyard Farm Kennels Limited | Other services | 2002 |
| Bridgewater Medical Limited | Health & social care | 2024 |
| Bridgman-Wren Properties Ltd | Construction | 2026 |
| Brigadeiros UK Ltd | Manufacturing | 2025 |
| Bright & Beautiful UK Limited | Professional & scientific | 2009 |
| Bright Vibes Support Solutions Ltd | Administrative & support | 2025 |
| Brink Architects Ltd | Professional & scientific | 2017 |
| Britannia Architectural Metalwork Ltd | Extraterritorial | 2020 |
| Britannia Metalwork Services Limited | Administrative & support | 2008 |
| Britcan Sourcing Ltd | Wholesale & retail | 2022 |
| Brook and Co Accountants Ltd | Professional & scientific | 2018 |
| Brookberry Limited | | 1974 |
| Brookfield Property Maintenance Ltd | Households | 2019 |
| Brown Dog Overland Limited | Wholesale & retail | 2018 |
| Brown Teapot Ltd | Construction | 2019 |
| Bruce & Co Couriers Limited | Transport & logistics | 2024 |
| Bryany Aston Limited | Manufacturing | 2004 |
| BTF (UK) Ltd | Professional & scientific | 2012 |
| Buckingham Concessions Limited | Wholesale & retail | 2000 |
| Buckingham Wills Limited | Professional & scientific | 2003 |
| Bucks Land & Estates Limited | Financial services | 2025 |
| Builditwell Properties Limited | Real estate | 2018 |
| Bullen Consultancy Limited | Professional & scientific | 2019 |
| Bullinghope Limited | Agriculture & fishing | 1972 |
| Bulwark Management Services Limited | Professional & scientific | 2018 |
| Burtons Heating & Cooling Ltd | Construction | 2025 |