| BMV London Ltd | Financial services | 2025 |
| BMV Property Sourcing Ltd | Real estate | 2018 |
| Bmyt Ltd | Extraterritorial | 2025 |
| BMZ Change Ltd | Information & communication | 2025 |
| BMZ Services Bristol Ltd | Transport & logistics | 2025 |
| BN Ecology Ltd | Professional & scientific | 2024 |
| BNA Events Limited | Administrative & support | 2011 |
| Bnbrielle Limited | Administrative & support | 2022 |
| BNC Painting & Decorating Ltd | Construction | 2022 |
| BNC Property Developments Ltd | Construction | 2021 |
| BNC Transport Ltd | Transport & logistics | 2015 |
| BNS Design Solutions Limited | Wholesale & retail | 2024 |
| BNS Health & Safety Ltd | Administrative & support | 2015 |
| BNS Limited | Real estate | 2008 |
| BNS Management Services Limited | Professional & scientific | 2009 |
| BNS Property Services Ltd | Extraterritorial | 2024 |
| BNS Services Limited | Financial services | 2007 |
| BNW Logistics Ltd | Transport & logistics | 2026 |
| Bo&E Limited | Wholesale & retail | 2020 |
| BOA Global Investments Ltd | Professional & scientific | 2017 |
| Boakes Developments Limited | Real estate | 2024 |
| Board Mill Management Company Ltd | Real estate | 2014 |
| Board Property Limited | Real estate | 2022 |
| Board&Bloom Ltd | Manufacturing | 2023 |
| Boardies International Ltd | Wholesale & retail | 2009 |
| Boardinghouse Windfarm Limited | Energy | 2011 |
| Boardroom Advisors Limited | Professional & scientific | 2016 |
| Boardwalk Property Company Limited | Real estate | 2013 |
| Boat Department Limited | Wholesale & retail | 2023 |
| Boaz Care Limited | Administrative & support | 2016 |
| BOB Broomfield Limited | Wholesale & retail | 2013 |
| BOB Design & Marketing Limited | Professional & scientific | 2005 |
| BOB Lloyd Mobile Welding Limited | Manufacturing | 2015 |
| BOB Marshall Investments Limited | Professional & scientific | 1998 |
| BOB Marshall Properties Ltd | Real estate | 2023 |
| BOB Massey Associates Limited | Professional & scientific | 2010 |
| BOB Shop 30 Ltd | Wholesale & retail | 2025 |
| BOB the Other Builder Ltd | Real estate | 2005 |
| Bobalinga Ltd | Arts & recreation | 2010 |
| Bobbetts Mackan (CLS) Limited | Professional & scientific | 1999 |
| Bobbetts Mackan Limited | Professional & scientific | 1988 |
| Bobby Rose Ltd | Professional & scientific | 2019 |
| Bobby's Removalz Ltd | Transport & logistics | 2025 |
| BOBBY7FIGGA Music Limited | Information & communication | 2025 |
| Bobbys News Agents Limited | Wholesale & retail | 2013 |
| Bober Services Limited | Transport & logistics | 2014 |
| Bobo Creative Ltd | Arts & recreation | 2025 |
| Bobo Production Services Limited | Information & communication | 2016 |
| Bobo Property Management Limited | Real estate | 2019 |
| Bobo's Kolors Ltd | Wholesale & retail | 2023 |
| Bobs Fruit Box Ltd | Wholesale & retail | 2017 |
| Bob’S Mobile Tyres Ltd | Wholesale & retail | 2024 |
| Bocabar Finzels Reach Ltd | Hospitality | 2019 |
| Bocacina Limited | Hospitality | 2003 |
| Boco Property Investments Ltd | Real estate | 2026 |
| Boddo Ltd | Transport & logistics | 2022 |
| Bodhi Resourcing Ltd | Information & communication | 2014 |
| Bodhie Limited | Administrative & support | 2017 |
| Bodi Group Ltd | Health & social care | 2024 |
| Bodley Chiropractic Limited | Health & social care | 2006 |
| Bodley Property Limited | Real estate | 2024 |
| Bodmin Solar Limited | Energy | 2011 |
| Bodrdoc CIC | Education | 2025 |
| Bodri Ltd | Construction | 2018 |
| Body and Soul Online Limited | Health & social care | 2025 |
| Body by Bikini Ltd | Other services | 2022 |
| Body Composition Coach Limited | Education | 2025 |
| Body Development Education Limited | Extraterritorial | 2009 |
| Body Focus Fitness Ltd | Arts & recreation | 2020 |
| Body Logic Rehab Ltd | Health & social care | 2023 |
| Body MAP System Limited | Information & communication | 2025 |
| Body Perfect Nails Limited | Other services | 2025 |
| Body Positive Creations Ltd | Arts & recreation | 2024 |
| Body Recovery Box Limited | Health & social care | 2025 |
| Body Repairs Bristol Ltd | Wholesale & retail | 2009 |
| Body Rhythm Music Ltd | Arts & recreation | 2022 |
| Bodyboard Escapes Limited | Administrative & support | 2024 |
| Bodymatter Limited | Information & communication | 2004 |
| Bodyme Ltd | Manufacturing | 2011 |
| Bodywise (UK) Limited | Manufacturing | 1989 |
| Bodywork Solutions Group Limited | Manufacturing | 2021 |
| Bodywork Studios Limited | | 1983 |
| Bodyworx Auto Repairs Limited | Wholesale & retail | 2017 |
| BOF Technologies Ltd | Information & communication | 2025 |
| BOG Events Limited | Other services | 2017 |
| Bogdan Healthcare Ltd | Health & social care | 2021 |
| Boggie Energies Limited | Professional & scientific | 2026 |
| Bogillde Retreats Ltd | Real estate | 2021 |
| Boha Glass Ltd | Wholesale & retail | 2012 |
| Bohun Leasehold Limited | Real estate | 2026 |
| BOI (UK) Pensions Trustees Limited | Financial services | 1965 |
| BOI Capital Funding (NO.1) LP | | 2005 |
| BOI Capital Funding (NO.2) LP | | 2006 |
| BOI Capital Funding (NO.3) LP | | 2006 |
| BOI Capital Funding (NO.4) LP | | 2006 |
| Boigers Street Food Ltd | Hospitality | 2022 |
| Boiler Brew Ltd | Hospitality | 2024 |
| Boiler House Storage CIC | Transport & logistics | 2019 |
| Boilers Bathrooms Wetrooms (South West) Ltd | Construction | 2021 |
| Boilers Bathrooms Wetrooms Ltd | Construction | 2017 |