| Bailey Motors Ltd | Wholesale & retail | 2023 |
| Bairstow Street Limited | Real estate | 2026 |
| Baka North Western Ltd | Wholesale & retail | 2024 |
| Baker Hardman Limited | Professional & scientific | 2020 |
| Bakers (Area 1) Limited | Extraterritorial | 1961 |
| Bako Bidco Ltd | Financial services | 2024 |
| Bako Group Limited | Hospitality | 2013 |
| Bako Limited | Hospitality | 1964 |
| Bako North Western Limited | Extraterritorial | 2018 |
| Bako Northern (Holdings) Limited | Extraterritorial | 1998 |
| Bako Scotland Limited | Extraterritorial | 2003 |
| Bako South Eastern Limited | Extraterritorial | 2013 |
| Bakolians Limited | Wholesale & retail | 2022 |
| Bakr Service Limited | Education | 2026 |
| Baksonvest UK Ltd | Professional & scientific | 2009 |
| Balaji Accountancy Services Limited | Professional & scientific | 2005 |
| Balaji Accountants Limited | Professional & scientific | 2026 |
| Balaji Health Plus Ltd | Health & social care | 2025 |
| BALL2DATA Limited | Information & communication | 2025 |
| Ballistic Artwork Ltd | Arts & recreation | 2024 |
| Ballos Trading & Investment Limited | Wholesale & retail | 2017 |
| Bally Limited | Construction | 2002 |
| Bally-Empire Limited | Wholesale & retail | 2025 |
| Balmoral Blackburn Ltd | Real estate | 2015 |
| Baltic Triangle Hotel Investors Limited | Construction | 2020 |
| Balu Garage Ltd | Wholesale & retail | 2022 |
| Bamber Bridge Auto Electrics Limited | Wholesale & retail | 2013 |
| Bamber Bridge Bargains Ltd | Wholesale & retail | 2026 |
| Bamber Bridge Bathrooms Ltd | Wholesale & retail | 2022 |
| Bamber Bridge Car Wash and Valeting Ltd | Other services | 2023 |
| Bamber Bridge Foods Ltd | Hospitality | 2023 |
| Bamber Bridge Limited | Construction | 2026 |
| Bamber Bridge Medical Ltd | Health & social care | 2015 |
| Bamber Bridge Practice Ltd | Health & social care | 2021 |
| Bamber Bridge Residents Company Limited | Households | 2001 |
| Bamber Bridge Tanning Ltd | Other services | 2017 |
| Bamber Bridge Vape Limited | Wholesale & retail | 2025 |
| Bamber Joinery & Construction Limited | Construction | 2005 |
| Bamber Plumbing & Heating Limited | Construction | 2003 |
| Bamber Projects Ltd | Professional & scientific | 2018 |
| Bamber Properties Ltd | Real estate | 2019 |
| Bambers Remedial Contractors Limited | Construction | 2004 |
| Bambers Removals Limited | Transport & logistics | 2026 |
| Bamboo Food Ltd | Hospitality | 2025 |
| Bamfor Limited | Wholesale & retail | 2025 |
| Bamford Department Ltd | Extraterritorial | 2013 |
| Bamford Design Ltd | Professional & scientific | 2014 |
| Bamford Homes Preston Limited | Real estate | 2025 |
| Bamford Trading Limited | Arts & recreation | 2013 |
| Banana Crate Limited | Wholesale & retail | 2025 |
| BANFY411 Healthcare Solutions Limited | Health & social care | 2022 |
| Bangeez Limited | Professional & scientific | 2025 |
| Bangla School CIC | Education | 2025 |
| Banister Bros. & Co. Limited | Administrative & support | 2014 |
| Bank Hall Kindergarten Limited | Education | 1992 |
| Bank House Lettings Limited | Real estate | 2006 |
| Bankhall (Broughton) Management Company Limited | Households | 2007 |
| Banks Commercials Limited | Manufacturing | 2023 |
| Bankt Ltd | Wholesale & retail | 2025 |
| Banktop Farm Shop Limited | Hospitality | 2026 |
| Bannister Caravan Storage Limited | Hospitality | 1999 |
| Bannister Court Residents Limited | Households | 2007 |
| Bannister Hall Consultancy Ltd | Administrative & support | 2025 |
| Bannister Hall Limited | Wholesale & retail | 2014 |
| Bannister House Fisheries Ltd | Agriculture & fishing | 1999 |
| Bano Foods Lancashire Limited | Wholesale & retail | 2020 |
| Banoo Group Ltd | Wholesale & retail | 2025 |
| Banx Construction Ltd | Construction | 2025 |
| BAO Transport Ltd | Transport & logistics | 2025 |
| Baomit Ltd | Transport & logistics | 2021 |
| Bapp Industrial Supplies (Preston) Limited | Wholesale & retail | 1999 |
| Bapu Investment Group Limited | Real estate | 2020 |
| Bar Lounge Venues Limited | Hospitality | 2016 |
| Bar Ltd | Hospitality | 2025 |
| Bar Pintxos Limited | Hospitality | 2021 |
| Barakah Express Ltd | Wholesale & retail | 2022 |
| Barakah Trading Ltd | Wholesale & retail | 2023 |
| Barakamart Ltd | Wholesale & retail | 2025 |
| Barber Family Holdings Limited | Financial services | 2023 |
| Barber Family Properties Limited | Real estate | 2023 |
| Barber Pumps (Supplies and Repairs) Limited | Wholesale & retail | 1982 |
| Barber Solicitors Limited | Professional & scientific | 2012 |
| Barbican Security Limited | Administrative & support | 2013 |
| Barcode Specialists Limited | Information & communication | 2010 |
| Barcon Holdings Limited | Financial services | 2024 |
| Barcon Hygiene Limited | Wholesale & retail | 2024 |
| Bardsley Estates Limited | Real estate | 2000 |
| Bare Cannon Limited | Real estate | 2025 |
| Bare Capital Ltd | Real estate | 2016 |
| Bare Chorley Limited | Real estate | 2022 |
| Bare Estates Ltd | Administrative & support | 2017 |
| Bare Group Holdings Limited | Financial services | 2025 |
| Bare Interiors Limited | Construction | 2021 |
| Bare Park Limited | Real estate | 2024 |
| Bare Trinity Limited | Real estate | 2025 |
| Bare Willow Limited | Real estate | 2025 |
| Bargainzcentral Ltd | Wholesale & retail | 2022 |
| Baridway Properties Limited | Real estate | 2001 |
| Barista-It Ltd | Hospitality | 2026 |
| Barkabullz Pet Store Limited | Wholesale & retail | 2025 |