| Bubblegum Hypnosis Ltd | Information & communication | 2022 |
| Bubu Probuild Ltd | Construction | 2026 |
| Buchanans Property Limited | Real estate | 2016 |
| Buck Consulting Ltd | Administrative & support | 2012 |
| Bucketlist Holidays Ltd | Administrative & support | 2021 |
| Buckets for Bongos Ltd | Education | 2022 |
| Buckingham Developments (Aylesbury) Limited | Real estate | 2001 |
| Buckinghamshire Advantage | Other services | 2004 |
| Buckinghamshire Builders Limited | Construction | 2017 |
| Buckinghamshire Business First | Administrative & support | 2000 |
| Buckinghamshire Community Foundation. | Administrative & support | 1998 |
| Buckinghamshire Gardens Trust | Education | 2003 |
| Buckinghamshire Mazda Limited | Wholesale & retail | 2009 |
| Buckinghamshire Media Limited | Information & communication | 2008 |
| Buckinghamshire Music Trust | Education | 2018 |
| Buckinghamshire School of Aesthetics Ltd | Education | 2026 |
| BUCKINGHAMSHIRE4X4 Ltd | Wholesale & retail | 2020 |
| Buckland Barns Management Limited | Households | 2000 |
| Buckland Landscapes Limited | Administrative & support | 2001 |
| Buckland Road Residents Company Limited | Households | 1995 |
| Buckland Solutions Ltd | Information & communication | 2010 |
| Buckland Wharf Management Company Limited | Households | 1990 |
| Bucks Advance Ltd | Hospitality | 2024 |
| Bucks Aesthetics Limited | Other services | 2025 |
| Bucks Auto Services Limited | Wholesale & retail | 2019 |
| Bucks Beauty Work Limited | Wholesale & retail | 2021 |
| Bucks Blinds Ltd | Manufacturing | 2023 |
| Bucks Boilers Ltd | Construction | 2022 |
| Bucks Brickwork Ltd | Construction | 2023 |
| Bucks Cctv Ltd | Administrative & support | 2017 |
| Bucks DAB Ltd | Information & communication | 2022 |
| Bucks Electrical LP | | 2021 |
| Bucks Farrier Service Ltd | Professional & scientific | 2003 |
| Bucks Flat Roofing Specialists Limited | Construction | 2014 |
| Bucks Floor Sanding Ltd | Construction | 2022 |
| Bucks Flooring Limited | Construction | 2013 |
| Bucks Frailty Care Consultancy Services Ltd | Health & social care | 2025 |
| Bucks Happy Place CIC | Health & social care | 2025 |
| Bucks Heating Ltd | Construction | 2025 |
| Bucks Hire Limited | Administrative & support | 2026 |
| Bucks K9 Security Ltd | Administrative & support | 2024 |
| Bucks Logistic Ltd | Transport & logistics | 2025 |
| Bucks Motor Company Ltd | Wholesale & retail | 2025 |
| Bucks Plant and Tool Hire Ltd | Administrative & support | 2022 |
| Bucks Plant Care Limited | Professional & scientific | 2015 |
| Bucks Plant Solutions Ltd | Administrative & support | 2026 |
| Bucks Plumbing and Heating Ltd | Construction | 2017 |
| Bucks Prime Travels Ltd | Administrative & support | 2021 |
| Bucks Properties Ltd | Real estate | 2010 |
| Bucks Recycling Limited | Water & waste | 1997 |
| Bucks Site Services Ltd | Administrative & support | 2023 |
| Bucks SOS Mobile Tyres Limited | Wholesale & retail | 2024 |
| Bucks Trampoline & Tumbling Academy Ltd | Arts & recreation | 2026 |
| Bucks Transport Ltd. | Transport & logistics | 2025 |
| Bucks Travel Limited | Transport & logistics | 2018 |
| Bucks Tube Formers Limited | Manufacturing | 2020 |
| Bucks Welding & Fabrication Ltd | Construction | 2013 |
| Bucks Wifi Engineer Limited | Information & communication | 2025 |
| Bucksvision | Health & social care | 2012 |
| Budds GAS Works Ltd | Construction | 2024 |
| Budget Cars Aylesbury Ltd | Transport & logistics | 2023 |
| Budget Removals Ltd | Transport & logistics | 2023 |
| Build Scope Ltd | Construction | 2025 |
| Buildclean Solutions Limited | Construction | 2025 |
| Building Blocks Educational and Child Psychology Ltd | Education | 2026 |
| Buildright (UK) Ltd | Construction | 2008 |
| Built&Providers Ltd | Wholesale & retail | 2026 |
| Bulford Associates Limited | Arts & recreation | 2002 |
| Bulgarian Cultural and Learning Center - Aylesbury Ltd | Education | 2015 |
| Bullway Logistics Limited | Transport & logistics | 2026 |
| Bulmax Ltd | Transport & logistics | 2016 |
| Bumbled Ltd | Construction | 2021 |
| Bunce P D Ltd | Construction | 2026 |
| Bunce Plumbing and Heating Limited | Construction | 2014 |
| Bunces Court Freehold Co Ltd | Households | 2010 |
| Burchwell Productions Limited | Information & communication | 2022 |
| Burcott Properties Limited | Real estate | 2021 |
| Burgaj Windows & Doors Limited | Construction | 2023 |
| Burgess Electrical Services Limited | Construction | 2016 |
| Burgins Cars Limited | Transport & logistics | 2021 |
| Burles Engineering Limited | Administrative & support | 2007 |
| Burlington House Management Limited | Households | 1991 |
| Burnhams Field Management Limited | Households | 1987 |
| Burnt Peach Ltd | Professional & scientific | 2021 |
| Burson LR Parts Ltd | Wholesale & retail | 2025 |
| Burston Farmers Ltd | Agriculture & fishing | 2020 |
| Burton Web Services Limited | Administrative & support | 2013 |
| Bury Lake Young Mariners | Arts & recreation | 2002 |
| Bushchurch Management Company Limited | Administrative & support | 1995 |
| Business Coach Directory Ltd | Administrative & support | 2020 |
| Business Remit Limited | Professional & scientific | 2001 |
| Business Utilities Services Ltd | Administrative & support | 2025 |
| Butler Brown Properties LLP | | 2019 |
| Butlers Travel Ltd | Transport & logistics | 2024 |
| Butrint Ltd | Transport & logistics | 2018 |
| BUX Property Management Ltd | Real estate | 2024 |
| Buy Inhappy.Com Ltd | Wholesale & retail | 2022 |
| Buybits Limited | Wholesale & retail | 2013 |
| BW Management (Bury ST Edmunds) Limited | Real estate | 2014 |
| BWB Technology Ltd | Information & communication | 2020 |