| BE More Dandelion (Essex) CIC | Education | 2024 |
| BE Properties Ipswich Limited | Real estate | 2022 |
| Beachideaways Weymouth Limited | Real estate | 2024 |
| Beaconsfield Swimming Ltd | Wholesale & retail | 2019 |
| Beagle Flight Consultancy Limited | Professional & scientific | 2024 |
| Beanland Associates Architects Limited | Professional & scientific | 2004 |
| Beard Manners Ltd | Wholesale & retail | 2023 |
| Beatons Group Limited | Financial services | 2001 |
| Beatons Limited | Professional & scientific | 1993 |
| Beau Building Consultancy Ltd | Construction | 2026 |
| Beaudax Limited | Financial services | 2023 |
| Beauforts Limited | Professional & scientific | 2006 |
| Beaumont Ridge Care Group Ltd | Health & social care | 2026 |
| Beautederm UK Limited | Wholesale & retail | 2023 |
| Beautiesmine UK Ltd | Wholesale & retail | 2025 |
| Beauty by Jojo Ltd | Other services | 2024 |
| Beauty Without Cruelty Limited | Wholesale & retail | 2003 |
| Beautyroutine Limited | Other services | 2024 |
| BEC Properties Ltd | Real estate | 2021 |
| Beccameg Limited | Professional & scientific | 2008 |
| Beccles Road (Loddon Rise) Management Company Limited | Households | 2026 |
| Beckside Horsford Maintenance Limited | Administrative & support | 2024 |
| Becky's Kitchen Food Shop Limited | Wholesale & retail | 2026 |
| BECKY'S1 OH Consultancy Limited | Health & social care | 2019 |
| BED & Breakfast Nationwide Limited | Information & communication | 2003 |
| Bedeen Cleaning Services Limited | Administrative & support | 2025 |
| Bedford Estates Ltd. | Real estate | 2009 |
| Bedot Media Limited | Information & communication | 2012 |
| Beds Direct 2U Limited | Manufacturing | 2010 |
| BEE Kulture Ltd | Wholesale & retail | 2026 |
| Beech SME Finance Ltd | Financial services | 2026 |
| Beechlake Developments (ELM Farm) Limited | Construction | 2021 |
| Beechlake Developments Ltd | Construction | 2015 |
| Beechlake Holdings Limited | Financial services | 2024 |
| Beechlake Investments Limited | Real estate | 2024 |
| Beecholme Management Company Limited | Households | 1985 |
| Beehive 1968 Limited | Extraterritorial | 2014 |
| Beeson Properties Limited | Real estate | 1993 |
| Beezek Limited | Health & social care | 2022 |
| Before the Lines Limited | Other services | 2019 |
| Beget Properties Limited | Real estate | 2024 |
| Beige Rock Ltd | Arts & recreation | 2023 |
| Believe.Engage.Nurture Sports Management Ltd | Arts & recreation | 2021 |
| Bella Chilled Foods Ltd | Manufacturing | 2024 |
| Bella Dimora Limited | Wholesale & retail | 2018 |
| Bella Food Ipswich Limited | Hospitality | 2019 |
| Bella Vista Conversions Ltd | Construction | 2024 |
| Bella Vista Homes Limited | Real estate | 2022 |
| Bellcorp Ltd | Construction | 2011 |
| Belle Courier Services Ltd | Transport & logistics | 2024 |
| Belleview Property Limited | Construction | 2006 |
| Bello Brothers Ltd | Arts & recreation | 2024 |
| Bells Meadow Management Company Limited | Real estate | 2020 |
| Bellwood Construction Limited | Construction | 2015 |
| Belmin Property Ltd | Real estate | 2016 |
| Belmont Electrical Solutions Ltd | Construction | 2018 |
| Belovedcrown Ltd | Administrative & support | 2026 |
| Belstead Carpentry & Decorating Limited | Construction | 2015 |
| Belstead Properties Limited | Real estate | 2024 |
| Belstead Road Management Company Limited | Real estate | 2016 |
| Belvedere Boxing Club CIC | Arts & recreation | 2020 |
| BEN Dijkstra Limited | Arts & recreation | 2020 |
| BEN Doran Asset Limited | Hospitality | 2016 |
| BEN Doran Management Limited | Hospitality | 2016 |
| Bencas Chemist Limited | Wholesale & retail | 2013 |
| Bencorr Limited | Construction | 2017 |
| Benee Ltd | Construction | 2025 |
| Benefer Limited | Wholesale & retail | 2001 |
| BENEFITS2U Limited | Financial services | 2001 |
| Bengal Burritos Ltd | Hospitality | 2018 |
| Beniamin Clening Ltd | Administrative & support | 2025 |
| Benicia Properties Ltd | Real estate | 2017 |
| Benjamin Standridge and Associates Ltd | Construction | 2024 |
| Bennett Motor Company Limited | Wholesale & retail | 2006 |
| Bennett Transport Group Ltd | Transport & logistics | 2025 |
| Bennetts (SA) LLP | | 2009 |
| Benny D&C Ltd | Transport & logistics | 2024 |
| Bens Gutter Cleaning Suffolk Ltd | Administrative & support | 2026 |
| Bentel Ltd | Construction | 2015 |
| Bentine Limited | Professional & scientific | 2011 |
| Bentley Bathrooms & Boilers Ltd | Construction | 2023 |
| Bentley Book Keeping Services Ltd | Professional & scientific | 2025 |
| Bentley Community Shop CIC | Wholesale & retail | 2015 |
| Bentley European Transport Limited | Administrative & support | 2006 |
| Bentley Group Limited | Construction | 2011 |
| Bentleys Restaurants Limited | Manufacturing | 2004 |
| Benton Street Trees and Gardens Limited | Agriculture & fishing | 2026 |
| Benyrepair Limited | Wholesale & retail | 2025 |
| Berberoil Ltd | Wholesale & retail | 2025 |
| Berechurch Greenway Ltd | Wholesale & retail | 2024 |
| Bergholt Place (West Bergholt) Management Company Limited | Households | 2022 |
| Berkeley Consulting Ltd | Information & communication | 2025 |
| Berlin Packaging Holding UK Ltd | Wholesale & retail | 1951 |
| Berlin Packaging UK Ltd | Wholesale & retail | 1954 |
| Bermar (International) Limited | Manufacturing | 1991 |
| Bermuda Properties LLP | | 2011 |
| Berners Holdings Ltd | Health & social care | 2015 |
| Berners Yard Management Limited | Households | 2021 |
| Berry Retail Limited | Wholesale & retail | 2025 |
| Besana UK Limited | Wholesale & retail | 1990 |