| Blue Bubbles F&C Limited | Hospitality | 2022 |
| Blue Line Risk Management Ltd | Financial services | 2009 |
| Blue Sky Skylights Limited | Construction | 2022 |
| Bluenose 1875 Ltd | Financial services | 2023 |
| BNA Search Ltd | Professional & scientific | 2011 |
| Bobo Cassidy Limited | Arts & recreation | 2019 |
| Body Health Fitness Chesham Limited | Arts & recreation | 2024 |
| Bodymindup Ltd | Professional & scientific | 2025 |
| BOE Beverages Limited | Wholesale & retail | 2024 |
| BON Jovi Limited | Professional & scientific | 2023 |
| BON MOT Translation Limited | Professional & scientific | 2020 |
| Bonito Technology Limited | Real estate | 1999 |
| BOO BOO Investments Limited | Real estate | 2025 |
| Bordessa Cooling Services Ltd | Energy | 2022 |
| Bores Group Ltd | Information & communication | 2019 |
| Bouyant-C Ltd | Information & communication | 2022 |
| Bovary Estates Ltd | Real estate | 2016 |
| Bovingdon Airfield Limited | Information & communication | 2022 |
| Bovingdon Airfield Studios Limited | Extraterritorial | 2021 |
| Bovingdon Mots and Service Centre Ltd | Wholesale & retail | 2024 |
| Bovingdon Studios Limited | Information & communication | 2023 |
| Bowes Hill Limited | Extraterritorial | 2022 |
| Bowley Design Limited | Information & communication | 2006 |
| Brabazon Media Limited | Information & communication | 2012 |
| Bradbury Accounting Services Limited | Professional & scientific | 2009 |
| Bradshaw Property Associates Limited | Real estate | 2005 |
| Bradt Holdings Ltd | Financial services | 2021 |
| Bradt Travel Guides Ltd. | Information & communication | 2001 |
| Braid Construction & Interiors Limited | Construction | 2003 |
| Braid Construction Ltd | Construction | 2010 |
| Brain Game Limited | Information & communication | 2017 |
| Bramley Homes (Marlow) Limited | Construction | 2013 |
| Brand Design Hub Ltd | Wholesale & retail | 2021 |
| Brewedbyboon Ltd | Hospitality | 2023 |
| Brickett House Capital Limited | Real estate | 2026 |
| Bridge-Rite Ceramics Limited | Administrative & support | 2004 |
| Bridgefield Enterprises Limited | Administrative & support | 2023 |
| Bright Star Solutions Limited | Administrative & support | 2004 |
| Brightsparx Automotive Solutions Ltd | Wholesale & retail | 2020 |
| Brightway Education Limited | Education | 2017 |
| Briskona Limited | Information & communication | 2011 |
| Britanext Limited | Information & communication | 2024 |
| Britannia Fire Technology Limited | Professional & scientific | 2003 |
| Broad Spice Ltd | Hospitality | 2019 |
| Broadlands Roofing Ltd | Construction | 2013 |
| Broadway Barbers II Limited | Other services | 2009 |
| Brockhurst Consulting Ltd | Information & communication | 2024 |
| Brockhurst Management Company Limited | Households | 1985 |
| Brockhurst Motor Group Ltd | Wholesale & retail | 2024 |
| Brook Court (Watermeadow) Residents Limited | Households | 1994 |
| Brown House Collective Ltd | Wholesale & retail | 2025 |
| Brynmor Estates Limited | Real estate | 2018 |
| BTA Motors Ltd | Wholesale & retail | 2024 |
| Buckinghamshire Spinal Services Limited | Health & social care | 2016 |
| Buckinghamshire Therapy Ltd | Health & social care | 2026 |
| Bucks Air Conditioning Ltd | Construction | 2025 |
| Bucks Bodyfix Limited | Wholesale & retail | 2016 |
| Bucks Garden Rooms Limited | Construction | 2020 |
| Bucks Osteopathy Limited | Health & social care | 2016 |
| Bucks Retro & Vintage Ltd | Wholesale & retail | 2021 |
| Buddleys Limited | Manufacturing | 2023 |
| Built Environment:Ai Ltd | Information & communication | 2026 |
| Bulb Hair Ltd | Other services | 2013 |
| Bullet Records Limited | Extraterritorial | 2010 |
| Bunce Builders Ltd | Construction | 2017 |
| Burslem Port Trust | Transport & logistics | 2011 |
| Business Rules Ltd | Information & communication | 2015 |
| Business Visibility Systems Limited | Information & communication | 2004 |
| Bustamante & Co Ltd | Wholesale & retail | 2017 |
| BVN Construction Limited | Construction | 2022 |
| BWG Property Limited | Real estate | 2025 |
| Bynt Group Ltd | Extraterritorial | 2026 |
| C & N Professional Services Limited | Professional & scientific | 2013 |
| C B Film Accounts Limited | Information & communication | 2014 |
| C J Contego Limited | Professional & scientific | 2005 |
| C S Automotive Ltd | Wholesale & retail | 2015 |
| C&K Gray Consultants Limited | Professional & scientific | 2023 |
| C-Tech Composites Limited | Manufacturing | 1998 |
| C.G. Ansell & SON LLP | | 2018 |
| C.J. Sports Physio Ltd | Health & social care | 2019 |
| C.K.Witherall Properties Limited | Real estate | 2025 |
| CA Security Shutters Limited | Construction | 2022 |
| Caassa Corporation Limited | Professional & scientific | 2008 |
| Cabco of Chesham Ltd | Transport & logistics | 2009 |
| CAC Services Ltd | Financial services | 2023 |
| Cadbury Hill Estates Limited | Construction | 1984 |
| Cadceptual Design Limited | Professional & scientific | 1998 |
| Cadesi Limited | Professional & scientific | 2015 |
| Caiborg Limited | Information & communication | 2023 |
| Cain Architects Ltd | Professional & scientific | 2022 |
| Calandra Meredith Limited | Other services | 2010 |
| Calmur Construction Ltd | Construction | 2023 |
| Cameron Ralph Ltd | Wholesale & retail | 2023 |
| Camicla Ltd | Real estate | 2014 |
| Candlewick Hall Ltd | Professional & scientific | 2012 |
| Canidium (UK) Ltd | Information & communication | 2013 |
| Canine Countryside Escape Ltd | Agriculture & fishing | 2019 |
| Canopy Life Sciences Ltd. | Professional & scientific | 2010 |
| Canterbury Services Limited | Real estate | 2004 |
| Capital City Waste Ltd | Water & waste | 2012 |