| BETA4 Homes Ltd | Construction | 2023 |
| Betastreet Metal Roofing Ltd | Construction | 2023 |
| Beth Williams Property Group Ltd | Real estate | 2025 |
| Bethel Heritage Properties Ltd | Real estate | 2025 |
| Bethesda Care Ltd | Administrative & support | 2011 |
| Bethica Properties Ltd | Administrative & support | 2003 |
| Betonel Ltd | Transport & logistics | 2024 |
| Betostar Limited | Construction | 2023 |
| Betotransport Ltd | Transport & logistics | 2025 |
| Better Call DAN Ltd | Transport & logistics | 2026 |
| Better Call SAF Ltd | Professional & scientific | 2022 |
| Better Choice Home Care Ltd | Health & social care | 2025 |
| Better Medic Limited | Health & social care | 2015 |
| Bettermed Care Ltd | Health & social care | 2018 |
| Bettone Enterprises Ltd | Extraterritorial | 2010 |
| Between Sips Ltd | Wholesale & retail | 2021 |
| Beugo Ltd | Wholesale & retail | 2024 |
| Beulah Enterprise Limited | Transport & logistics | 2022 |
| Beulah Healthcareobk Limited | Health & social care | 2024 |
| Bevima Ltd | Agriculture & fishing | 2025 |
| Bewell Healthcare Ltd | Administrative & support | 2022 |
| Bexhill UK Limited | Financial services | 2000 |
| Beyers E-Comm Group Ltd | Wholesale & retail | 2025 |
| Beyers Group Limited | Health & social care | 2024 |
| Beyond Brilliance Limited | Information & communication | 2024 |
| Beyond Careers Limited | Education | 2025 |
| Beyond Disruption Ltd | Information & communication | 2019 |
| Beyond Health & Beauty Ltd | Other services | 2025 |
| Beyond Health & Beauty Redbourn Ltd | Other services | 2026 |
| Beyond Property Investments Ltd | Real estate | 2025 |
| BF Investment Holdings Ltd | Real estate | 2026 |
| BF Sports Limited | Wholesale & retail | 2020 |
| BFG Audio and Visual Security Limited | Administrative & support | 2018 |
| BFG Support and Facilities Services Limited | Administrative & support | 2018 |
| BFL Builders Ltd | Construction | 2021 |
| BFL Global Law LLP | | 2024 |
| BG 50 Limited | Hospitality | 2025 |
| BG Build Ltd | Construction | 2021 |
| Bg/Gb D@Rling Ltd | Manufacturing | 2024 |
| BGA Electrical Construction Ltd | Construction | 2018 |
| Bgct Limited | Construction | 2025 |
| BGI Coaching Limited | Other services | 2016 |
| BGR Facility Management Ltd | Construction | 2025 |
| BGS Air Centre Limited | Construction | 2017 |
| BGS Intelligent Door Solutions Limited | Manufacturing | 1998 |
| BH Investors Ltd | Real estate | 2024 |
| BH Network Solutions Limited | Construction | 2010 |
| Bhagvati Limited | Wholesale & retail | 2025 |
| Bhaji's Kitchen Limited | Manufacturing | 2013 |
| Bharat Beyond Borders Ltd | Wholesale & retail | 2024 |
| Bhavins Food Limited | Wholesale & retail | 1999 |
| Bhavpan Investments Limited | Real estate | 2009 |
| Bheri Homes Limited | Real estate | 2025 |
| BHL Cost Consultants Limited | Professional & scientific | 2008 |
| BHL Properties Midlands Limited | Real estate | 2021 |
| BHO HGV Transport Ltd | Transport & logistics | 2025 |
| BHO Mortgage Ltd | Professional & scientific | 2022 |
| Bhola IT Ltd | Information & communication | 2019 |
| BHP Trade to Trade Group Ltd. | Wholesale & retail | 2023 |
| Bhuiyan Express Limited | Transport & logistics | 2018 |
| BI Integrations Ltd | Information & communication | 2022 |
| BI Unlimited Ltd | Professional & scientific | 2026 |
| Bianca Group Trans Ltd | Transport & logistics | 2018 |
| Bianco Interior Design Ltd | Construction | 2010 |
| Biandaro Estates Ltd | Construction | 2025 |
| Bianka Services Limited | Hospitality | 2025 |
| Bibi Contracts Trade Ltd | Other services | 2020 |
| Bibi Holdings Ltd | Hospitality | 2022 |
| Bibi Services Ltd | Other services | 2024 |
| Bibi’S Grocery Ltd | Wholesale & retail | 2021 |
| Bibleswag Ltd | Wholesale & retail | 2026 |
| Bicester Kebab Limited | Hospitality | 2024 |
| BID UK Services Ltd | Transport & logistics | 2015 |
| Biddenham House Ltd | Real estate | 2021 |
| Bidzzy Ltd | Wholesale & retail | 2026 |
| Biermann Hodge Limited | Construction | 2010 |
| Big Aa's Company Limited Ltd | Health & social care | 2019 |
| Big Bears Crew Ltd | Wholesale & retail | 2020 |
| Big Boss Global Services Ltd | Wholesale & retail | 2024 |
| Big Boss Mart Ltd | Wholesale & retail | 2024 |
| Big Data Mining Ltd | Information & communication | 2014 |
| Big DOM Limited | Other services | 2022 |
| Big Eaterz Limited | Hospitality | 2024 |
| Big ECK Limited | Manufacturing | 2022 |
| Big Fish Creative Limited | Arts & recreation | 1999 |
| Big Fish World Limited | Wholesale & retail | 2014 |
| Big Green Machine Ltd | Information & communication | 2011 |
| Big Health & Fitness C.I.C. | Arts & recreation | 2015 |
| Big Ideas Community Interest Company | Health & social care | 2016 |
| Big Ideas Company Limited | Arts & recreation | 2015 |
| Big Interior Systems Ltd | Construction | 2026 |
| Big JOE Global Ltd | Transport & logistics | 2020 |
| Big Joes Lighting Ltd | Construction | 2018 |
| Big MAK Holdings Limited | Professional & scientific | 2023 |
| Big SAI SAI Ltd | Wholesale & retail | 2023 |
| Big Screen Events Ltd | Wholesale & retail | 2024 |
| Bigbazket Ltd | Wholesale & retail | 2022 |
| Bigben UK Consultants Limited | Education | 2012 |
| Bigbens Entertainment Limited | Information & communication | 2023 |
| Bigdogcraft Limited | Information & communication | 2018 |