| Borisovcomehouse Limited | Households | 2025 |
| Borma Healthcare Ltd | Health & social care | 2023 |
| Borup Fire Protection Ltd | Construction | 2025 |
| BOS Business Office Solutions CIC | Administrative & support | 2016 |
| Boscobel Tavern Limited | Hospitality | 2011 |
| Boss Food Products Ltd | Hospitality | 2022 |
| Boss Property Solutions Ltd | Real estate | 2018 |
| Boss SID Properties Limited | Real estate | 2024 |
| Bostin Design Ltd | Professional & scientific | 2013 |
| Boulton Travel Ltd | Transport & logistics | 2009 |
| Bouncy Bouncy BOO Castle Hire Ltd. | Arts & recreation | 2016 |
| Boundary Fencing and Gate Services Ltd | Manufacturing | 2011 |
| BOURNE2PROPERTY Ltd | Real estate | 2025 |
| BOW Sports Limited | Wholesale & retail | 2009 |
| Bowale Limited | Real estate | 2026 |
| Bowbrook Properties Limited | Real estate | 2019 |
| Bowdee Business Solutions Ltd | Administrative & support | 2022 |
| Bowstridge PC Ltd | Professional & scientific | 2024 |
| Box in Box Limited | Arts & recreation | 2019 |
| Box OFF Construction Ltd | Construction | 2021 |
| Box Printify Ltd | Manufacturing | 2025 |
| Box to Box Academy Ltd | Arts & recreation | 2024 |
| Boxleys of Wombourne Limited | Wholesale & retail | 2007 |
| Boxx Smoke Ltd | Hospitality | 2025 |
| BOZ Temple-Morris Limited | Professional & scientific | 2003 |
| BP Express Ltd | Transport & logistics | 2026 |
| BP Hadley Limited | Professional & scientific | 2016 |
| BP Property Services (WM) Limited | Construction | 2021 |
| BP Wolverhampton Limited | Hospitality | 2023 |
| Bpde Ltd | Hospitality | 2025 |
| BPH Plumbing and Heating Limited | Construction | 2016 |
| BR Overseas UK Limited | Wholesale & retail | 2016 |
| Bracklea Fire Limited | Professional & scientific | 2022 |
| Bracklea Holdings Ltd | Financial services | 2025 |
| Bracklea Property Ltd | Real estate | 2025 |
| Bracx Ltd | Professional & scientific | 2024 |
| Bradburn & Hardiman UK Ltd | Professional & scientific | 2014 |
| Bradburn Motor Services Ltd | Wholesale & retail | 2024 |
| Braddock Property Holdings Ltd | Real estate | 2024 |
| Bradley's Angling & Guns Ltd | Arts & recreation | 2014 |
| Bradmore Newsagents Ltd | Wholesale & retail | 2026 |
| Bradmore Properties (Midlands) Ltd | Real estate | 2025 |
| Bradmore Trading Ltd | Hospitality | 2026 |
| Brahmvir Ltd | Construction | 2017 |
| Brainch Academy Ltd | Education | 2023 |
| Brainchild Digital Ltd | Information & communication | 2023 |
| Braitch Financial Planning Ltd | Financial services | 2023 |
| Braitch Notary Limited | Professional & scientific | 2023 |
| Braking Safe Limited | Wholesale & retail | 2014 |
| Bramhall Furniture Ltd. | Manufacturing | 2020 |
| Brampton Abbey Limited | Real estate | 1999 |
| Branch Mechanics Ltd | Wholesale & retail | 2023 |
| Brand Psyche Limited | Professional & scientific | 2015 |
| Branded Housewares Limited | Wholesale & retail | 2006 |
| Branded International Projects Limited | Construction | 2012 |
| Branding Violet Limited | Professional & scientific | 2023 |
| Brandme Programmes CIC | Information & communication | 2020 |
| Brandy Distributions Ltd | Wholesale & retail | 2016 |
| Brans Transport Limited | Transport & logistics | 2026 |
| Brantley Properties West Midlands Limited | Real estate | 2024 |
| Brar Construction Ltd | Construction | 2026 |
| Brar Pro Driving Ltd | Education | 2025 |
| Brasserie Restaurants Limited | Extraterritorial | 1986 |
| Bratch Consultancy Services Limited | Professional & scientific | 2018 |
| Bravewear Ltd | Wholesale & retail | 2025 |
| Braviner Ltd. | Manufacturing | 2016 |
| Brawn Power Ltd | Information & communication | 2020 |
| Bray Legal Services Limited | Real estate | 2009 |
| Breakloo Holdings Limited | Wholesale & retail | 2026 |
| Breastfeeding Midlands Limited | Health & social care | 2019 |
| Breastfeeding UK Limited | Health & social care | 2025 |
| Breathing Space Consultants Limited | Other services | 2013 |
| Brecon Care (BH) Ltd | Health & social care | 2022 |
| Brecon Care (PYB) Ltd | Extraterritorial | 2017 |
| Brecon Care Limited | Health & social care | 1992 |
| Brecon Healthcare Holdings Limited | Financial services | 2026 |
| Brecon Healthcare Ltd | Real estate | 2014 |
| Bredon Estates Ltd | Real estate | 2021 |
| Breeze Financial Solutions Limited | Financial services | 2012 |
| Brenvalist Ltd | Wholesale & retail | 2026 |
| Brenzilo Ltd | Wholesale & retail | 2025 |
| Brewerton Rentals Ltd | Real estate | 2024 |
| Brewing Technology Services Limited | Other services | 1996 |
| Brewing, Food & Beverage Industry Suppliers' Association | Other services | 2019 |
| Briandorc Ltd | Administrative & support | 2025 |
| Briar Construction Limited | Construction | 2016 |
| Briardale Estates Ltd | Real estate | 2026 |
| Brick by Brick Retail Ltd | Wholesale & retail | 2025 |
| Brick by Loft Ltd | Construction | 2026 |
| Bricklayer Properties Ltd | Real estate | 2020 |
| Bricklaying Construction Ltd | Construction | 2020 |
| Bricks and Mortar Investment Group Ltd | Real estate | 2023 |
| Bricks Kitchen Ltd | Hospitality | 2024 |
| Brickwork RP Ltd | Construction | 2019 |
| Bricliff Sales Consultants Limited | Wholesale & retail | 2014 |
| Bridge 4328 Ltd | Professional & scientific | 2026 |
| Bridge Art Properties Ltd | Real estate | 2021 |
| Bridgend Power Limited | Energy | 2022 |
| Bridgeway Global Ventures Ltd | Wholesale & retail | 2026 |
| Bridgnorth Road Pharmacy Limited | Wholesale & retail | 2003 |