| Beyond Laundry Ltd | Other services | 2023 |
| Beyond Risk Limited | Professional & scientific | 2019 |
| Beyond Styles Limited | Information & communication | 2023 |
| Beyond the Feed Ltd | Information & communication | 2026 |
| BEYONDNEWCO110 Limited | Extraterritorial | 2018 |
| BFE Solar Limited | Construction | 2022 |
| BFO Developments Ltd | Real estate | 2023 |
| BFS INT Ltd | Education | 2020 |
| BG Dent Ltd | Health & social care | 2024 |
| BG NOM1 Limited | Professional & scientific | 2019 |
| BG NOM2 Limited | Professional & scientific | 2019 |
| Bgmc Holdings Ltd | Financial services | 2026 |
| Bgmc Technologies Ltd. | Information & communication | 2025 |
| BGR Bloomer Limited | Professional & scientific | 2010 |
| BGS Europe Limited | Other services | 2011 |
| BH Lacrosse Ltd | Education | 2025 |
| BH Renovations Ltd | Construction | 2025 |
| BH Wilmslow Ltd | Construction | 2023 |
| Bhagya Limited | Health & social care | 2019 |
| Bhamkar Company Ltd | Real estate | 2024 |
| Bhasha Investment Limited | Real estate | 2024 |
| BHE (Heartlands) Limited | Real estate | 2001 |
| BHE (ST James) Limited | Real estate | 2005 |
| Bhuvan Properties Ltd | Real estate | 2017 |
| BI4U Limited | Information & communication | 2019 |
| BIA Property Ltd | Real estate | 2023 |
| BIA Unlimited Service Limited | Professional & scientific | 2022 |
| BIB4TYRES Ltd | Manufacturing | 2026 |
| Bibby Systems Consultants Limited | Professional & scientific | 2021 |
| Bibs Trading UK Limited | Wholesale & retail | 2021 |
| Bicept Biologics Limited | Professional & scientific | 2025 |
| Bicester HC Development Limited | Real estate | 2020 |
| Bickham House Limited | Health & social care | 2005 |
| Bicyclette Limited | Wholesale & retail | 2020 |
| Bidfins Limited | Information & communication | 2025 |
| Bidscript Ltd | Information & communication | 2024 |
| Bidtech Solutions Limited | Information & communication | 2011 |
| Bifit Co. Ltd | Health & social care | 2022 |
| Big Bear Design Limited | Information & communication | 2012 |
| Big BOG Brewing Company Limited | Manufacturing | 2015 |
| Big Dog Data Limited | Professional & scientific | 2023 |
| Big Fish Little Fish (Manchester) Limited | Wholesale & retail | 2008 |
| Big Jelly Digital Limited | Information & communication | 2018 |
| Big Little Technology Ltd | Information & communication | 2021 |
| Big Media Presence Limited | Administrative & support | 2005 |
| Big Monster Ltd | Manufacturing | 2014 |
| Bigthinkingonline Ltd | Wholesale & retail | 2010 |
| Bike KIT Ltd | Wholesale & retail | 2012 |
| Bilal Fazal Shaikh Ltd | Health & social care | 2025 |
| Biltoneton Limited | Real estate | 2005 |
| Binary Connections Limited | Administrative & support | 2014 |
| Binex Ltd | Professional & scientific | 2007 |
| BIO Laboratories Limited | Wholesale & retail | 1996 |
| BIO Technical Limited | Manufacturing | 2021 |
| Biocan Biotech Limited | Professional & scientific | 2019 |
| Bioinformed Limited | Professional & scientific | 2023 |
| Biomin UK Limited | Professional & scientific | 2013 |
| Bioprosa Ltd | Professional & scientific | 2025 |
| Bios Life Ltd | Information & communication | 2025 |
| Biostrata Ltd | Professional & scientific | 2012 |
| Biotheia Limited | Administrative & support | 2024 |
| Birch Heath Road (Tarporley) Management Limited | Households | 2015 |
| Birch Law Limited | Professional & scientific | 2022 |
| Birch Tree Court Management Company Limited | Households | 1992 |
| Birch View Flat Management Company Limited | Households | 2013 |
| Birchall Lettings Limited | Real estate | 2023 |
| Birchbaby Ltd | Wholesale & retail | 2024 |
| Bird Bidco Limited | Financial services | 2024 |
| Bird Marketing Services Limited | Professional & scientific | 2023 |
| Birdhall Properties Limited | Real estate | 1997 |
| Birdie Care Services Limited | Administrative & support | 2017 |
| Birdlip House Ltd | Health & social care | 2022 |
| Birkdale 2005 Holdings Limited | Professional & scientific | 2023 |
| Birkdale Place (Sale) Management Company Limited | Households | 1998 |
| Birkin Consulting Ltd | Professional & scientific | 2012 |
| Birmingham Community Spirit | Professional & scientific | 2011 |
| Birmingham Regeneration LP | | 2010 |
| Biryani Spot Ltd | Hospitality | 2025 |
| Bishopsgate Holdco Ltd | Transport & logistics | 2023 |
| Bishopsgate Newco Ltd | Transport & logistics | 2023 |
| BIT BIO Limited | Professional & scientific | 2016 |
| Bitcoin Accountant Ltd | Professional & scientific | 2022 |
| Bitcoin Asset Reserve Limited | Information & communication | 2025 |
| Bites Tours Ltd | Administrative & support | 2019 |
| Bithyve UK Ltd | Information & communication | 2018 |
| Bitsoft Limited | Information & communication | 2017 |
| Bittrex Global (UK) Limited | Financial services | 2022 |
| Bizlend Limited | Administrative & support | 2018 |
| BJG Consulting Limited | Professional & scientific | 2020 |
| BJT Design Limited | Information & communication | 2022 |
| BK Clinical Research Limited | Professional & scientific | 2022 |
| BK Communication Consultants Limited | Administrative & support | 2024 |
| BK Resource Solutions Limited | Information & communication | 2013 |
| BK Trustee 1 Limited | Professional & scientific | 2024 |
| BK Trustee 2 Limited | Professional & scientific | 2024 |
| BK VAX Limited | Professional & scientific | 2021 |
| BKA Group Limited | Financial services | 2020 |
| Bkinder Ltd | Information & communication | 2025 |
| BKN Dental Ltd | Health & social care | 2023 |
| BKN Trading Ltd | Real estate | 2025 |