| Bare Health Supplements Ltd | Wholesale & retail | 2024 |
| Bargain Busters Limited | Wholesale & retail | 2013 |
| Barn 27 Limited | Information & communication | 2005 |
| Barnett and Co. (UK) Limited | Professional & scientific | 2021 |
| Barnwell Young Associates Ltd | Wholesale & retail | 2004 |
| Barny Transport Limited | Transport & logistics | 2013 |
| Barrientos Design Solutions Ltd | Professional & scientific | 2023 |
| Barrow Properties Limited | Construction | 2002 |
| Base Technical Solutions Limited | Construction | 2004 |
| Basma Derfoufi Limited | Administrative & support | 2025 |
| Bauhaus Creative Limited | Construction | 2024 |
| Baws Nationwide Ltd | Administrative & support | 2023 |
| BAX Healthcare Ltd | Health & social care | 2018 |
| Baybush Motor Co. Limited | Wholesale & retail | 2003 |
| Baywater Healthcare UK Limited | Health & social care | 2013 |
| Bazaar Media Group Limited | Professional & scientific | 2017 |
| Bazerbow Limited | Professional & scientific | 2014 |
| Bazi Holdings Ltd | Financial services | 2022 |
| BBK Titans Services Ltd | Transport & logistics | 2018 |
| Bborrello Therapy Ltd | Health & social care | 2025 |
| BCB 4 Transport UK Ltd | Transport & logistics | 2025 |
| BCL Construction (UK) Limited | Construction | 2002 |
| Bcroft Farms Limited | Agriculture & fishing | 2025 |
| Bddistributions Ltd | Wholesale & retail | 2026 |
| BE Safe Cctv Ltd | Information & communication | 2015 |
| BE World Ltd | Wholesale & retail | 2018 |
| Beadacious Ltd | Manufacturing | 2023 |
| Beam Coffee Limited | Manufacturing | 2025 |
| Bear Tough Ltd | Manufacturing | 2020 |
| Beartown Plastering Contractors Ltd | Construction | 2026 |
| Beau Coeur 28 C.I.C. | Hospitality | 2024 |
| Beaufort Chancery Limited | Professional & scientific | 2009 |
| Beautiful Hair International Ltd | Wholesale & retail | 2016 |
| Beautiful Penny Blossoms Ltd | Other services | 2025 |
| Beauty and the Box Limited | Wholesale & retail | 2023 |
| Beauty at Perfections Aesthetics Ltd | Health & social care | 2024 |
| Beauty by G Ltd | Other services | 2022 |
| Beauty Heaven by MAZ Ltd | Other services | 2025 |
| Beckas PUB Limited | Hospitality | 2026 |
| BEE at One Therapy Ltd | Extraterritorial | 2021 |
| BEE Interactive Limited | Information & communication | 2010 |
| Beech & Barratt Properties Ltd | Real estate | 2017 |
| Beechwood Partners Limited | Agriculture & fishing | 2017 |
| Beecroft Farms Limited | Agriculture & fishing | 2025 |
| Beginners Call UK Ltd | Education | 2023 |
| Bella Spa Nails Ltd | Other services | 2022 |
| Bellagio Football Ltd | Wholesale & retail | 2018 |
| Bellrose Ropetech Limited | Manufacturing | 2026 |
| Bellview Gardening Ltd | Administrative & support | 2025 |
| Bellwood (NW) Limited | Construction | 2019 |
| BEN Reading Ltd | Construction | 2026 |
| BEN Steele Wind Ltd | Construction | 2022 |
| Benjamin Calvert's Engineering Services Limited | Professional & scientific | 2017 |
| Bennu Appliances Ltd | Wholesale & retail | 2023 |
| Bentley Properties Management Ltd | Real estate | 2026 |
| Bentleydetail Ltd | Administrative & support | 2023 |
| Benz Site Services Limited | Construction | 2023 |
| Berbs Ltd | Wholesale & retail | 2021 |
| Bereavement Finance Limited | Financial services | 2017 |
| Beronmarch Limited | Hospitality | 2001 |
| Bertie's Pet Boutique Ltd | Wholesale & retail | 2021 |
| Bertieb Limited | Wholesale & retail | 2013 |
| Bespak Holdings Limited | Financial services | 2026 |
| Bespak Limited | Manufacturing | 2024 |
| Bespoke Detailing Ltd | Administrative & support | 2023 |
| Bespoke Lettings Limited | Real estate | 2010 |
| Bespoke New Build Ltd | Construction | 2026 |
| Best Brokers Ltd | Financial services | 2012 |
| Best Nest EGG Limited | Real estate | 2022 |
| Best Nest Group LLP | | 2023 |
| Best Nest Properties Ltd | Real estate | 2012 |
| Best YOU Prescribers Limited | Health & social care | 2025 |
| Bestoo AI Limited | Wholesale & retail | 2026 |
| Beswick Relocation Services Limited | Real estate | 2000 |
| Beswicks View Ltd | Agriculture & fishing | 2026 |
| Betamindes Group Limited | Financial services | 2022 |
| Betamindes Limited | Health & social care | 2005 |
| Bethel Project Management Services Ltd | Construction | 2026 |
| Betley Court Farm Partnership Limited | Agriculture & fishing | 2016 |
| Betley Court Ltd | Arts & recreation | 2019 |
| Betley Property Limited | Real estate | 2004 |
| Betley Village Shop Limited | Wholesale & retail | 2022 |
| Betradesavvy Limited | Manufacturing | 2016 |
| Better Driver Limited | Extraterritorial | 2016 |
| Betty and Belle Limited | Wholesale & retail | 2007 |
| Beuran Logistics Ltd | Transport & logistics | 2022 |
| BEV Ltd | Extraterritorial | 2020 |
| Bevora Ltd | Extraterritorial | 2026 |
| Beyond Beauty Group Ltd | Other services | 2025 |
| Beyond Beauty Tanning Limited | Other services | 2026 |
| Beyond Here Travel Ltd | Administrative & support | 2025 |
| BG Property Development Ltd | Construction | 2018 |
| BH Rentals Ltd | Real estate | 2026 |
| Bhpworldwide Ltd | Manufacturing | 2021 |
| Bibbys Fast Food Ltd | Hospitality | 2018 |
| BID Logistics Limited | Transport & logistics | 2025 |
| Biddington Holdings Limited | Other services | 2019 |
| Biddle Rail Ltd | Other services | 2025 |
| Biddle Technical Services Ltd | Administrative & support | 2023 |
| Biddulph Land Limited | Real estate | 2012 |