| Biolab Systems Ltd | Manufacturing | 2025 |
| Biomass Energy Fund I LP | | 2010 |
| Biotrak Limited | Wholesale & retail | 1990 |
| Birch Carpets Frimley Ltd | Wholesale & retail | 2025 |
| Birchfields Services Limited | Professional & scientific | 2009 |
| Biryanimax Harrow Limited | Hospitality | 2023 |
| Biser Luxe Transport Ltd | Transport & logistics | 2025 |
| Bishay Active Ltd | Other services | 2023 |
| Bishops Consulting Engineers Ltd | Professional & scientific | 2012 |
| Bishops Green (Ecchinswell Road) Management Company Limited | Households | 2025 |
| Bisley Management Company Limited | Households | 2017 |
| BIZ Adventure Ltd | Health & social care | 2016 |
| Bjmcs Holdings Limited | Financial services | 2023 |
| Bjmcs Property Investment Ltd | Real estate | 1992 |
| BKG Building Contractors Limited | Construction | 2025 |
| Black Crown Label Limited | Manufacturing | 2020 |
| Black Label Creations Limited | Administrative & support | 2017 |
| Blackbox Company (UK) Limited | Information & communication | 2012 |
| Blackburn International (UK) Limited | Arts & recreation | 2000 |
| Blackburn International Holdings Limited | Financial services | 2025 |
| Blackbushe Airport Limited | Transport & logistics | 1982 |
| Blackend PM Services Ltd | Professional & scientific | 2021 |
| Blackrock GMB Limited | Hospitality | 2024 |
| Blackstone Civil & Groundworks Limited | Construction | 2026 |
| Blackwater Analytics Limited | Information & communication | 2025 |
| Blackwater Dental Surgery & Implant Centre Ltd | Health & social care | 2023 |
| Blackwater Electric Limited | Construction | 2023 |
| Blackwater Fryers Ltd | Hospitality | 2023 |
| Blackwaters CG Ltd | Administrative & support | 2013 |
| Blauw Consulting Limited | Administrative & support | 2022 |
| BLC 121 Limited | Administrative & support | 2017 |
| Bleep 247 Limited | Administrative & support | 2014 |
| Bleep 360 Care Limited | Health & social care | 2017 |
| Blessed Imuwa Ltd | Administrative & support | 2018 |
| Blind Spot Sports Limited | Wholesale & retail | 2020 |
| Bliss Willows (Chipping Norton) Management Company Limited | Households | 2025 |
| Block Elite Limited | Information & communication | 2024 |
| Blockprime Property Management Ltd | Real estate | 2019 |
| Blocpod Ltd | Construction | 2023 |
| Bloq App Ltd | Information & communication | 2025 |
| Blue Cat Holdings Limited | Financial services | 2018 |
| Blue Chilli Solutions Limited | Construction | 2015 |
| Blue Falcon Property Ltd | Real estate | 2024 |
| Blue Mountain Gemstones Ltd | Administrative & support | 2014 |
| Blue Tech Air Ltd | Construction | 2020 |
| Bluebell Gardens (Wivelsfield Green) Management Company Limited | Households | 2024 |
| Bluefish Landscaping Contractors Ltd | Administrative & support | 2016 |
| Blueman Consultancy Limited | Information & communication | 2015 |
| Blueplane Limited | Transport & logistics | 2013 |
| Bluestar International Limited | Professional & scientific | 1997 |
| Bluevault Ltd | Professional & scientific | 2019 |
| Bluewater Financial Services Limited | Financial services | 2004 |
| Blulu Consulting Ltd | Information & communication | 2025 |
| Bluposh Ltd | Wholesale & retail | 2026 |
| BMB Homes Ltd | Real estate | 2025 |
| BMC Motor Ltd | Wholesale & retail | 2026 |
| BMH Foods Ltd | Hospitality | 2023 |
| BMS Care for Children Limited | Health & social care | 2025 |
| BMS Care Providers Limited | Administrative & support | 2019 |
| Bnyad Foods Ltd | Wholesale & retail | 2015 |
| BOB Potter Leisure Limited | Hospitality | 1977 |
| Bode Insurance Solutions Limited | Financial services | 1995 |
| Boga Roads Ltd | Construction | 2022 |
| Bohemia Invest One Ltd | Financial services | 2022 |
| Bohemia Invest Two Ltd | Extraterritorial | 2022 |
| Bohling Fitness Limited | Arts & recreation | 2022 |
| Bonetti Ltd | Wholesale & retail | 2018 |
| Bonovate Limited | Professional & scientific | 2010 |
| Bonsor Penningtons Property Services | Real estate | 1986 |
| Bonus Eventus Limited | Construction | 2024 |
| Bonus Eventus Maintenance Ltd | Construction | 2015 |
| Bonvivant Dress Limited | Wholesale & retail | 2022 |
| Boogie Pumps (Farnham) Ltd | Education | 2019 |
| Boost Mortgages Ltd | Financial services | 2025 |
| Bootak Ltd | Wholesale & retail | 2023 |
| Borgo Alle Vigne Properties Limited | Professional & scientific | 2012 |
| Borgo Alle Vigne Properties NO.2 Limited | Professional & scientific | 2025 |
| Boris Becker Limited | Hospitality | 2019 |
| Boris Television Limited | Information & communication | 1997 |
| Borz Developments Ltd | Real estate | 2024 |
| Boss Elevators Ltd | Manufacturing | 2012 |
| Boss Tech Repairs Ltd | Wholesale & retail | 2025 |
| Boston Aesthetics Clinic Ltd | Health & social care | 2025 |
| Bouncy Bear Books Ltd | Information & communication | 2024 |
| Bowood Property Services Limited | Extraterritorial | 2012 |
| Boyer Planning Limited | Administrative & support | 1990 |
| BP Methley Homes Limited | Construction | 2023 |
| Bpcamberley Limited | Hospitality | 2019 |
| BPD Security Solutions Limited | Administrative & support | 2014 |
| Brace Design and Build Limited | Construction | 2023 |
| Brackendale Estates Ltd | Real estate | 2025 |
| Bradfords Signs Limited | Extraterritorial | 2010 |
| Brainchild Psychology Ltd | Education | 2022 |
| Bramall Place Management Company Ltd | Households | 2025 |
| Brambledown Residents Association (Woking) Limited | Households | 1991 |
| Brants Building Ltd | Construction | 2026 |
| Brash Studio Limited | Information & communication | 2025 |
| Breakthrough Moments Ltd | Professional & scientific | 2023 |
| Breckenridge Lettings Limited | Real estate | 2014 |
| Brendas Schoolwear Ltd | Wholesale & retail | 2017 |