| BF Surfacing Ltd | Construction | 2023 |
| Bfco Ltd | Professional & scientific | 2019 |
| Bfit PT Ltd | Arts & recreation | 2023 |
| BFS Sports Management Ltd | Extraterritorial | 2017 |
| BG Properties (Preston) Ltd | Real estate | 2025 |
| BG Shop Liverpool Ltd | Hospitality | 2023 |
| BG Shop Ltd | Wholesale & retail | 2021 |
| BG Shop Manchester Ltd | Hospitality | 2023 |
| BH Properties (NW) Ltd | Real estate | 2022 |
| BH Supplements Ltd | Health & social care | 2025 |
| Bhai Buns Ltd | Hospitality | 2026 |
| Bhaker Ltd | Households | 2024 |
| Bham Digital Limited | Information & communication | 2016 |
| Bhata Properties Ltd | Households | 2022 |
| Bhav Properties & Lettings Limited | Real estate | 2024 |
| BHR Investments Ltd | Other services | 2015 |
| Bhutta & Gill Limited | Wholesale & retail | 2014 |
| BIA Properties Limited | Households | 2018 |
| Bianca Transport NW Ltd | Transport & logistics | 2025 |
| Bianco PR1 Ltd | Hospitality | 2021 |
| Biba Trading Ltd | Wholesale & retail | 2024 |
| Bibby Techworks Ltd | Professional & scientific | 2025 |
| Bickerstaffe Aviation Limited | Other services | 2008 |
| Bidds Transport Limited | Transport & logistics | 2025 |
| Biedrona Sweet Ltd | Wholesale & retail | 2018 |
| Big Al's Food Company Limited | Manufacturing | 2002 |
| Big ALS Tools Ltd | Wholesale & retail | 2022 |
| Big Bang Snacks Limited | Administrative & support | 2005 |
| Big Basket Retail Limited | Wholesale & retail | 2026 |
| Big Black Box Ltd | Arts & recreation | 2021 |
| Big Gigs Small Venues Ltd | Professional & scientific | 2025 |
| Big Giraffe Capital Limited | Financial services | 2016 |
| Big Giraffe Consulting Limited | Professional & scientific | 2016 |
| Big Red Power Tools Ltd | Wholesale & retail | 2021 |
| Big Scarp Limited | Wholesale & retail | 2024 |
| Big Thinking Publishing Ltd | Information & communication | 2025 |
| Big Zebra Capital Limited | Financial services | 2024 |
| Big ZEE Holding Company Limited | Financial services | 2024 |
| Bigger Faster Greener Ltd | Manufacturing | 2025 |
| Bigger Public Relations Ltd | Manufacturing | 2009 |
| Biggiesworld Ltd | Wholesale & retail | 2024 |
| Biggins Wood Trading Limited | Hospitality | 2015 |
| Biggy C Ltd | Real estate | 2022 |
| Bijou Direct Limited | Wholesale & retail | 2021 |
| Bijoux RJ Ltd | Wholesale & retail | 2010 |
| Bikzandy Company Limited | Transport & logistics | 2025 |
| Bilbao Offshore Holding Limited | Financial services | 2019 |
| Bilbao Offshore Investment Limited | Financial services | 2019 |
| Bilbao Service Ltd | Construction | 2024 |
| Bildabin Limited | Wholesale & retail | 2003 |
| Bill & Bunn Ltd | Hospitality | 2016 |
| Bill Cushing Builders Limited | Construction | 2017 |
| Bill Hardman Nutrition Limited | Wholesale & retail | 2018 |
| Billbeam Ltd | Wholesale & retail | 2024 |
| Billhouse Holdings Ltd | Financial services | 2020 |
| Billie Group Ltd | Manufacturing | 2014 |
| Billie's Catering Ltd | Hospitality | 2026 |
| Billinge Diving and Marine Services Ltd | Construction | 2015 |
| Billinge Property Group Ltd | Real estate | 2020 |
| Billingsley Ltd | Extraterritorial | 2025 |
| Billington Enterprises Limited | Professional & scientific | 2014 |
| Billingtons Funeral Directors Limited | Other services | 2012 |
| Billy & FIG Limited | Professional & scientific | 2022 |
| Billy Robson Property Ltd | Real estate | 2025 |
| Bilmont Ltd | Real estate | 2020 |
| Bilsborrow Property Developers Ltd | Construction | 2017 |
| Binkley's Ltd | Administrative & support | 2024 |
| Bintaan Ltd | Wholesale & retail | 2021 |
| BIO Engineering Services (Southport) Limited | Manufacturing | 2010 |
| BIO Green Products Ltd | Wholesale & retail | 2021 |
| BIO Nature Style Ltd | Administrative & support | 2015 |
| BIO VAC Pharma Ltd | Wholesale & retail | 2021 |
| Biologikill Limited | Administrative & support | 2016 |
| Biomass Energy Limited | Wholesale & retail | 2023 |
| Biomat Ltd | Professional & scientific | 2025 |
| Bionet Investments Limited | Real estate | 2024 |
| Biopercept Ltd | Manufacturing | 2017 |
| Bioscape Developments Ltd | Construction | 2021 |
| Bioshred Games Ltd | Information & communication | 2025 |
| Biotech Resources (NL) Ltd | Professional & scientific | 2014 |
| Birchall Blackburn Limited | Extraterritorial | 1995 |
| Birchall Electrical Services Ltd | Construction | 2017 |
| Birchall Enterprises Limited | Real estate | 2020 |
| Birchwood Digital Assets Ltd | Wholesale & retail | 2022 |
| Birchwood NW Ltd | Other services | 2012 |
| Bird Marketing and Design Consultancy Ltd | Professional & scientific | 2015 |
| Birdential Limited | Health & social care | 2025 |
| Birdie's Coffee & Cakes Limited | Wholesale & retail | 2017 |
| Birkinshaw Raven Limited | Professional & scientific | 2001 |
| Birley Grange Management Company Limited | Households | 1994 |
| Birleys Solicitors Ltd | Professional & scientific | 2009 |
| Birr Trade Limited | Other services | 2023 |
| Birrell Design Partnership Limited | Administrative & support | 2007 |
| Birth & Beyond Nursing and Midwifery Services Ltd | Health & social care | 2024 |
| Birtwistle Property Investments Ltd | Real estate | 2022 |
| Bishop's Crook Brewery Ltd. | Manufacturing | 2013 |
| Bismillah Holdings Limited | Real estate | 2024 |
| Bison Products Limited | Administrative & support | 2011 |
| Bison Resin Limited | Construction | 2026 |
| BIT Accounting Limited | Professional & scientific | 2024 |