| Beech Hotels (Wiltshire) Limited | Hospitality | 2022 |
| Beeches Properties Limited | Construction | 2019 |
| Beeconnect Limited | Financial services | 2020 |
| Beekalabs Ltd | Information & communication | 2017 |
| Been Bar Restaurant Ltd | Hospitality | 2024 |
| Beertorrent Ltd | Wholesale & retail | 2015 |
| Beki's Brownies Ltd | Administrative & support | 2006 |
| Believe 2 Achieve Health Solutions Limited | Health & social care | 2011 |
| Bella Home Care Ltd | Health & social care | 2009 |
| Belmax Builders Limited | Construction | 2019 |
| Belmont Court Management (Leamington) Limited | Households | 1976 |
| Belmont Hill Holdings Limited | Real estate | 2021 |
| Belveder CIC | Health & social care | 2023 |
| BEM Gelado Limited | Professional & scientific | 2012 |
| BEN Macey Limited | Real estate | 2026 |
| Ben's Tidy Limited | Administrative & support | 2025 |
| Benedetto Luxury International Consulting Ltd | Professional & scientific | 2017 |
| Benedicta Ltd | Wholesale & retail | 2025 |
| Benefusion Plus Limited | Administrative & support | 2024 |
| Benforde Corporate & Nominee Services Limited | Extraterritorial | 2010 |
| Benjamin Lewitt Limited | Arts & recreation | 2023 |
| Bennison Lettings Limited | Real estate | 2021 |
| Benny's Properties Limited | Real estate | 2024 |
| Bennys Golf Store Limited | Wholesale & retail | 2022 |
| Bentley Wood Limited | Wholesale & retail | 1980 |
| Bergamot PR and Marketing Limited | Education | 2012 |
| Bericote Developments Limited | Professional & scientific | 2006 |
| Bericote Investments Limited | Professional & scientific | 2006 |
| Bericote Land Limited | Professional & scientific | 2006 |
| Bericote Park Limited | Agriculture & fishing | 2012 |
| Bericote Project Management 3 Ltd | Real estate | 2015 |
| Bericote Properties Limited | Construction | 2006 |
| Berkeley House Capital Limited | Professional & scientific | 2018 |
| Berkswell Gardens Management Company Ltd | Construction | 2023 |
| Berkswell Properties Limited | Real estate | 1979 |
| Berry.Love Ltd | Information & communication | 2025 |
| Bertie Terrace Management Limited | Extraterritorial | 1989 |
| Beso Properties Ltd | Real estate | 2026 |
| Bespoke Flooring (Midlands) Limited | Construction | 2025 |
| Bespoke Glass Ltd | Manufacturing | 2025 |
| Best BOY Electric Ltd | Information & communication | 2000 |
| Best Estate, Succession & Trust Foundation | Other services | 2021 |
| Best to Best Healthcare Ltd | Health & social care | 2023 |
| Bettarooms Developments Holding Limited | Real estate | 2024 |
| Bettarooms Property Developments Ltd | Real estate | 2024 |
| Better Body Coaches Limited | Professional & scientific | 2013 |
| Better World Music Limited | Information & communication | 2018 |
| Betterlife Wellness Ltd | Health & social care | 2024 |
| Bettsworth Human Resources Consulting Limited | Professional & scientific | 2008 |
| Bettsworth Property Ltd | Real estate | 2018 |
| Bewick Wealth Management Limited | Financial services | 2023 |
| Beyond House Cleaning Ltd | Administrative & support | 2024 |
| Beyond Solar Ltd | Professional & scientific | 2022 |
| Beyond Solar(Uk) Ltd | Professional & scientific | 2026 |
| BGN Wholesale Limited | Wholesale & retail | 2023 |
| BH Laystall Ltd | Extraterritorial | 2025 |
| BH Support Services Limited | Health & social care | 2013 |
| BH Trading Rugby Limited | Administrative & support | 2023 |
| Bhasha & Co Ltd | Real estate | 2025 |
| Bia's Kitchen Ltd | Hospitality | 2023 |
| Big Boss Heating & Plumbing Limited | Construction | 2025 |
| Big Parking Limited | Transport & logistics | 2018 |
| Bill Walker Consulting Limited | Professional & scientific | 2021 |
| Bimbamboom Ltd | Real estate | 2025 |
| Binaebi Elegant Ensembles Ltd | Wholesale & retail | 2025 |
| Bing Trading Limited | Wholesale & retail | 2023 |
| Binning Developments Limited | Construction | 2020 |
| Binswood Barbers Ltd | Other services | 2024 |
| Biome Studio Ltd | Professional & scientific | 2025 |
| Biran Holdings Ltd | Financial services | 2022 |
| Biran Property Investments Limited | Administrative & support | 2008 |
| Bird Cage Blue Ltd | Hospitality | 2013 |
| Birdcage Pubs UK Ltd | Hospitality | 2025 |
| Birds Nest Management Ltd | Households | 2025 |
| Birdwood Games Ltd | Manufacturing | 2020 |
| Birkland House Management Company Limited | Households | 1984 |
| Birkley Management Services Limited | Professional & scientific | 2020 |
| Birmingham Breast Group Limited | Health & social care | 2022 |
| Birmingham Urology Clinic Ltd | Health & social care | 2017 |
| Bishop Fryer Ltd | Wholesale & retail | 2022 |
| Bishopgate Associates Limited | | 1987 |
| Biyyanii Capital Holdings Ltd | Financial services | 2026 |
| Bizzy Tots Day Nursery Limited | Education | 2004 |
| BJ Contractors Ltd | Construction | 2007 |
| BKG Construction Limited | Households | 2014 |
| BKS Construction Ltd | Construction | 2024 |
| Blab Group Ltd | Hospitality | 2025 |
| Black Circle Property Ltd. | Real estate | 2018 |
| Black Flag Horticulture Limited | Wholesale & retail | 2023 |
| Black Horse (Moreton Morrell) Ltd | Hospitality | 2020 |
| Black Onyx Retail Ltd | Wholesale & retail | 2024 |
| Black Saiyan Properties Ltd | Real estate | 2019 |
| Blackadder Corporation 3 Limited | Health & social care | 2013 |
| Blackadder Corporation Contracting Limited | Health & social care | 2020 |
| Blackadder Corporation II Limited | Health & social care | 2017 |
| Blackadder Corporation Limited | Health & social care | 2011 |
| Blackdown Developments Ltd | Construction | 2016 |
| Blackdown Growers (Holdings) Limited | Financial services | 2023 |
| Blackdown Growers Marketing Limited | Agriculture & fishing | 2009 |
| Blackhawke Ltd | Professional & scientific | 2026 |