| Be&R Limited | Manufacturing | 2024 |
| Be-Different Recruitment Limited | Information & communication | 2020 |
| Beacon Installations Limited | Construction | 2014 |
| Beam Group Limited | Extraterritorial | 1984 |
| Beard Viking Ltd | Wholesale & retail | 2025 |
| Bearroc Construction Ltd | Construction | 2017 |
| Bearwood Consulting Ltd | Professional & scientific | 2021 |
| BEAUTY@NO9 Limited | Other services | 2025 |
| Beckley Financial Planning Ltd | Financial services | 2019 |
| Bedforbury Ltd | Construction | 2025 |
| BEE Design Consulting Ltd | Professional & scientific | 2025 |
| BEE Kinde Limited | Health & social care | 2025 |
| Beer & Preston Ltd | Construction | 2018 |
| Bees Logistics Limited | Transport & logistics | 2024 |
| Beia Ltd | Information & communication | 2024 |
| Beladr Group Ltd | Wholesale & retail | 2020 |
| Belgrave Bloodstock Limited | Extraterritorial | 2008 |
| Belgrave View Management Co. Limited | Professional & scientific | 2005 |
| Bellanapoli Ristorante (Shrewsbury) Limited | Hospitality | 2017 |
| Bellanapoli Ristorante Limited | Real estate | 2015 |
| Bellgreen Consulting Ltd | Real estate | 2000 |
| Belmont Fabrications Limited | Manufacturing | 1981 |
| Belvedere a Decorating Company Limited | Construction | 2025 |
| Bence Associates Limited | Professional & scientific | 2012 |
| Benchmark Studios Limited | Information & communication | 2012 |
| Beneford Limited | Information & communication | 2001 |
| Benham Chase Management Company Limited | Real estate | 1995 |
| Benham Lane Management Company Limited | Households | 2012 |
| Benham Park Enterprises Limited | Hospitality | 2025 |
| Benham Tech Limited | Professional & scientific | 2025 |
| Benic Healthcare Services Limited | Health & social care | 2022 |
| Beninca Automation UK Limited | Manufacturing | 2010 |
| Benitech Solutions Ltd. | Information & communication | 2017 |
| Benoil Services Limited | Wholesale & retail | 1985 |
| Benric Ltd | Information & communication | 2022 |
| Bentley Marketing Limited | Wholesale & retail | 2004 |
| Berkshire Agripower Ltd. | Agriculture & fishing | 2000 |
| Berkshire Autoworks Ltd | Wholesale & retail | 2022 |
| Berkshire Bike Breakers Ltd | Wholesale & retail | 2024 |
| Berkshire Bodyshop Ltd | Wholesale & retail | 2011 |
| Berkshire Business Centre Management Company Limited | Administrative & support | 2013 |
| Berkshire Business Management Ltd | Information & communication | 2018 |
| Berkshire Car Sales Ltd | Wholesale & retail | 2026 |
| Berkshire Cars (Newbury) Limited | Extraterritorial | 2018 |
| Berkshire Cricket Limited | Education | 2025 |
| Berkshire Dreamworks Ltd | Information & communication | 2024 |
| Berkshire Finance Limited | Extraterritorial | 2002 |
| Berkshire Gardens Trust | Arts & recreation | 2009 |
| Berkshire Legal Services Limited | Professional & scientific | 2007 |
| Berkshire Lgsr Solutions Ltd | Construction | 2026 |
| Berkshire Linen Services Limited | Other services | 1997 |
| Berkshire Meat Traders Limited | Wholesale & retail | 1999 |
| Berkshire Meat Traders NO. 2 Limited | Wholesale & retail | 2024 |
| Berkshire Oak Barns Ltd | Construction | 2011 |
| Berkshire Printmakers Ltd | Arts & recreation | 2023 |
| Berkshire Sealants Limited | Wholesale & retail | 1990 |
| Berkshire Talent Academy CIC | Arts & recreation | 2017 |
| Berkshire Taxis Ltd | Transport & logistics | 2018 |
| Berkshire Trustees Limited | Professional & scientific | 2013 |
| Berkshire Ventures Ltd | Wholesale & retail | 2025 |
| Bermad UK Limited | Manufacturing | 1988 |
| Bermar House Management Limited | Real estate | 2006 |
| Bespoak Creations Limited | Manufacturing | 2012 |
| Bespoke Accommodation Solutions Limited | Hospitality | 2025 |
| Bespoke SBS Limited | Construction | 2016 |
| Bespoke Strategies Limited | Professional & scientific | 2020 |
| Best Academy Ltd | Education | 2025 |
| Best SP Ltd | Real estate | 2021 |
| Bestfit Limited | Information & communication | 2013 |
| BET NOW Limited | Extraterritorial | 2006 |
| Beta ENG Limited | Other services | 2019 |
| Beth Robertson Limited | Other services | 2020 |
| Betta Aquatics (Clacton) Limited | Administrative & support | 2003 |
| Better World Technologies Ltd | Information & communication | 2024 |
| Betterterm Resident Management Limited | Households | 1986 |
| Bettormetrics Ltd | Information & communication | 2021 |
| Between Art and Technology Studio Limited | Professional & scientific | 2012 |
| Beverley Northover Limited | Administrative & support | 2015 |
| Beyond Infinite Limited | Transport & logistics | 2026 |
| Bggch Management Services Ltd | Information & communication | 2024 |
| BGM Heating and Plumbing Limited | Construction | 2004 |
| BHB Build Limited | Construction | 2023 |
| BHP Solutions Ltd | Real estate | 2009 |
| Bickleigh Ridge Limited | Professional & scientific | 2006 |
| Bickleigh Ridge Properties Limited | Real estate | 2012 |
| Big Bang Pictures Ltd | Information & communication | 2022 |
| Big Open Box Limited | Information & communication | 2008 |
| Big Print Limited | Manufacturing | 2007 |
| Bigbuyinternational Ltd | Wholesale & retail | 2022 |
| Biglogic Limited | Information & communication | 2025 |
| Bike Treads Limited | Wholesale & retail | 2017 |
| Bikelux Ltd | Wholesale & retail | 2020 |
| Billingshurst Management Company Limited | Real estate | 2021 |
| BIN Tong Park Ltd | Professional & scientific | 2022 |
| Bina Properties Limited | Real estate | 2012 |
| Bingham Investment Group Ltd | Real estate | 2024 |
| Bintangchip Semicon Manufacture Limited | Manufacturing | 2025 |
| Biocap Limited | Professional & scientific | 2020 |
| Biocontrol Limited | Professional & scientific | 1997 |
| Biocosmedical Holdings Ltd | Manufacturing | 2022 |