| Beacon Digital Limited | Information & communication | 2025 |
| Beacon Hill (Property) Limited | Extraterritorial | 1953 |
| Beacon Scientific Consulting Ltd | Professional & scientific | 2024 |
| Beacon: for Rare Diseases Ltd | Health & social care | 2012 |
| Beaconsfield House Cambridge (Management) Limited | Households | 1986 |
| Beagle Court Management Limited | Households | 1986 |
| Bean Brokers Ltd | Professional & scientific | 2022 |
| Bean Industries Limited | Professional & scientific | 2010 |
| Bean&Scoop Ltd | Hospitality | 2025 |
| Bear Bear Property Ltd | Real estate | 2023 |
| Beatrice MAY Limited | Financial services | 2025 |
| Beau & Olive Ltd | Information & communication | 2025 |
| Beau's Bakehouse Ltd | Manufacturing | 2017 |
| Beaucroft Watch Company Ltd | Manufacturing | 2025 |
| Beaufort Secretaries Limited | Professional & scientific | 2020 |
| Beaumont Aesthetic Clinic Ltd | Other services | 2021 |
| Beaumont Computer Software Ltd | Information & communication | 1996 |
| Beaumont Construction Group Limited | Construction | 2017 |
| Beaumont Sawston Ltd | Real estate | 2013 |
| Beautiful Day (Cambridge) Limited | Arts & recreation | 2012 |
| Beautiful Wonder Ltd | Arts & recreation | 2016 |
| Beautilization Limited | Professional & scientific | 2014 |
| Beautique Nails & Beauty Ltd | Other services | 2023 |
| Beauty Packaging (Shanghai) Co., Ltd | Extraterritorial | 2014 |
| Beauté Intemporelle Limited | Wholesale & retail | 2026 |
| Bebehut Limited | Wholesale & retail | 2016 |
| BEC & Cheps Ltd | Real estate | 2023 |
| BEC Electronic Ltd | Wholesale & retail | 2025 |
| Beccles Business Consulting Ltd | Professional & scientific | 2023 |
| Beche Court Management Limited | Other services | 2004 |
| Bechecombers Hair Salon Ltd | Other services | 2014 |
| Becks Rural Ltd | Agriculture & fishing | 2025 |
| Becky Hair Sports Performance and Physiotherapy Ltd | Other services | 2021 |
| Becky Hicks Limited | Other services | 2021 |
| Becoming Untriggered LLP | | 2024 |
| Becoolbike Co., Ltd | Extraterritorial | 2023 |
| Bedesh Ltd | Hospitality | 2024 |
| Bedford Urology Limited | Health & social care | 2020 |
| Bedlam Farming Company Limited | Agriculture & fishing | 2023 |
| Bedlam Parties Ltd | Arts & recreation | 2025 |
| Bedouin Cambridge Limited | Hospitality | 2014 |
| Bedouin Caterers Ltd | Hospitality | 2017 |
| BEE Moving Soon Limited | Real estate | 2015 |
| Beechdale Homes Limited | Construction | 1995 |
| Beecher Limited | Financial services | 2015 |
| Beeches at Royston Limited(The) | Households | 1963 |
| Beechwood Complementary Medical Ltd | Real estate | 2026 |
| Beehive Sushi Cambridge Ltd | Hospitality | 2025 |
| Beeline Chemicals Limited | Professional & scientific | 2020 |
| Beemarsh Property Limited | Real estate | 2023 |
| Beesitter Ltd | Agriculture & fishing | 2022 |
| Beeson Property Rentals Ltd | Households | 2009 |
| Beetons Field Limited | Arts & recreation | 2005 |
| Beezwah Properties Limited | Real estate | 2017 |
| Beginner's Luck Ltd | Extraterritorial | 2022 |
| Begley CRM Limited | Health & social care | 2022 |
| Beileidi Co., Limited | Wholesale & retail | 2024 |
| Being the Hands Ltd | Administrative & support | 2020 |
| Beirut House Ltd | Hospitality | 2026 |
| Beka Management Limited | Administrative & support | 2015 |
| Belbin Associates Limited | Professional & scientific | 1988 |
| Belbin EOT Corporate Trustee Limited | Professional & scientific | 2022 |
| Belbin Limited | Professional & scientific | 2022 |
| Belbin Lodges Limited | Real estate | 1989 |
| Belfast Beds Investments Limited | Real estate | 2020 |
| Belfast Beds Limited | Wholesale & retail | 2009 |
| Belfast Linen Trading Limited | Wholesale & retail | 1995 |
| Belfast Property Investments Limited | Real estate | 2002 |
| Belgian Anter Chemical Co., Ltd | Mining & quarrying | 2025 |
| Belgian Barna Industrial Co., Ltd | Mining & quarrying | 2024 |
| Belgium A-Plants Energy Chemical Group Co., Ltd | Mining & quarrying | 2025 |
| Belgium Anteweipu Plant Nutrition Co., Limited | Extraterritorial | 2025 |
| Belgium Antwerp Chemical Co., Ltd | Mining & quarrying | 2026 |
| Belgium Fdis International Co., Ltd | Mining & quarrying | 2026 |
| Belgium Hagerberg Chemical Co., Ltd | Mining & quarrying | 2024 |
| Belgium Limate Crop Nutrition Co., Limited | Extraterritorial | 2025 |
| Belgium Lutes Chemical Co., Ltd | Manufacturing | 2025 |
| Belgium Mima Chemical Co., Ltd | Mining & quarrying | 2024 |
| Belgium Oldman Crop Nutrition Co., Ltd | Mining & quarrying | 2026 |
| Belgium Sicalnit International Ltd | Mining & quarrying | 2024 |
| Belgrave Manor Residents Association Limited | Households | 1967 |
| Belin Services Ltd | Education | 2022 |
| Belinda and SON Ltd | Health & social care | 2015 |
| Bell Educational Trust Limited (the) | Education | 1972 |
| Bell Flavours & Fragrances Limited | Administrative & support | 2003 |
| Bell Road (Bottisham) Management Company Limited | Real estate | 1993 |
| Bella Inc Ltd | Wholesale & retail | 2025 |
| Bella Isla Limited | Manufacturing | 2019 |
| Bella Organic Café Ltd | Hospitality | 2025 |
| Bella's Childcare Ltd | Education | 2014 |
| Bellarome Limited | Administrative & support | 2009 |
| Bellavita Group Limited | Wholesale & retail | 2024 |
| Belle Composites Ltd | Manufacturing | 2020 |
| Belleflex Technologies UK Ltd | Manufacturing | 2025 |
| Bellingham's Couriers Ltd | Transport & logistics | 2012 |
| Bellmore Properties Ltd | Real estate | 2026 |
| Belsar Building Management Ltd | Real estate | 2020 |
| Belsar's Hill Stud and Farm Ltd | Agriculture & fishing | 2017 |
| Belvedere 132 Limited | Real estate | 2023 |
| Belvedere Commercial Management Ltd | Real estate | 2018 |