| Blusky Developments Ltd | Real estate | 2017 |
| BM Autocare Limited | Wholesale & retail | 2020 |
| BM Forensics Limited | Professional & scientific | 2025 |
| BM Wind Ltd | Professional & scientific | 2026 |
| BMA Events Limited | Hospitality | 2025 |
| Bmda Ltd | Wholesale & retail | 2023 |
| BMR International Limited | Transport & logistics | 2026 |
| BOB Reilly Developments Ltd | Real estate | 2024 |
| Bocca Builds Timber Frame Limited | Construction | 2023 |
| Body Perfect (North Wales) Limited | Wholesale & retail | 2014 |
| Bodywork - Pilates Ltd | Arts & recreation | 2002 |
| Bolt (YWJ) Limited | Wholesale & retail | 2009 |
| Bonair Property Renovations Ltd | Construction | 2025 |
| Bonaprene Products Limited | Manufacturing | 1979 |
| Book a Property Ltd | Real estate | 2021 |
| Bootpac Ltd | Wholesale & retail | 2020 |
| Border Cleaning Machines Limited | Wholesale & retail | 2003 |
| Border Group Holdings Limited | Financial services | 2018 |
| Border Maintenance Services Ltd | Administrative & support | 2019 |
| Border Tachograph Services Limited | Wholesale & retail | 1987 |
| Borderpropertygroup Ltd | Real estate | 2024 |
| Borras Bridal Limited | Administrative & support | 2024 |
| Borras DRY Cleaners Limited | Other services | 2025 |
| Borras Investments Limited | Real estate | 2020 |
| Borras Launderette Limited | Administrative & support | 2024 |
| Borras Laundry and Linen Hire Limited | Other services | 2023 |
| Borton Management Services Limited | Professional & scientific | 2012 |
| Bostock Air Conditioning Limited | Construction | 1996 |
| Bostock and Richmond Limited | Real estate | 2025 |
| Bostock Roofing & Leadwork Ltd | Construction | 2026 |
| Boujee Events Ltd | Arts & recreation | 2024 |
| Bounce Brands Limited | Wholesale & retail | 2019 |
| Bounceabout Castle Hire Limited | Administrative & support | 2017 |
| Bournes Cheese Ltd | Manufacturing | 2025 |
| Boutique 33 Ltd | Hospitality | 2024 |
| Bowen Aviation Limited | Manufacturing | 2014 |
| Bowling Bank Garage Limited | Wholesale & retail | 2012 |
| Bowmac Access Services Limited | Construction | 2004 |
| Box and Brew Ltd | Hospitality | 2025 |
| Boxlion International Trading Ltd | Wholesale & retail | 2020 |
| BOXTWENTY7 Ltd | Professional & scientific | 2018 |
| BPC RE Properties Limited | Real estate | 2015 |
| Bracknwell Partners Ltd | Professional & scientific | 2026 |
| Brand Design Creative Limited | Professional & scientific | 2023 |
| Brandt Alexander Ltd. | Professional & scientific | 2011 |
| Bransby Properties Ltd | Real estate | 2026 |
| Branwen Limited | Professional & scientific | 2017 |
| Bravura Hair Studio Limited | Other services | 2004 |
| Brays Roofing North Wales Ltd | Construction | 2019 |
| Breadsmiths Limited | Wholesale & retail | 2022 |
| Break Room Sports Bar Ltd | Hospitality | 2025 |
| Breezybay Media Ltd | Information & communication | 2026 |
| Brelto Optical Limited | Wholesale & retail | 2012 |
| Brereton Developments Limited | Real estate | 2006 |
| BRG Project Management Limited | Professional & scientific | 2019 |
| Brhb Projects Ltd | Professional & scientific | 2025 |
| Brick Children School (Tikathali) | Education | 2003 |
| Bricks & Keys Lettings Ltd | Real estate | 2025 |
| Bricks on Toast Property Ltd. | Real estate | 2022 |
| Bridge END Dental Limited | Health & social care | 2026 |
| Bridge House Clinic Limited | Health & social care | 2024 |
| Bridge Street Property (Wrexham) Limited | Construction | 2001 |
| Bridgewater Upholstery Limited | Manufacturing | 2015 |
| Bridgeway Garage Limited | Wholesale & retail | 2018 |
| Bright Brokers Ltd | Financial services | 2026 |
| Brightsparks 4KIDS Limited | Manufacturing | 2014 |
| Brimfield Breakers Ltd | Wholesale & retail | 2024 |
| British Karate Federation Ltd | Education | 2019 |
| Broadway Leisure Caravans Limited | Manufacturing | 2012 |
| Brook Street Superstore Ltd | Wholesale & retail | 2025 |
| Brother Industries (U.K.) Ltd. | Manufacturing | 1985 |
| Brothers Code Ltd | Information & communication | 2016 |
| Broughton Heights Limited | Other services | 2006 |
| Brownera Limited | Professional & scientific | 2013 |
| Browns Reclamation Ltd | Water & waste | 2024 |
| Brows by Sarah Franchise Limited | Other services | 2025 |
| Brows by Sarah Limited | Other services | 2025 |
| Brows by Sarah London Limited | Other services | 2024 |
| Brows by Sarah: the Brand Limited | Other services | 2021 |
| Bruce Roberts & Co Limited | Professional & scientific | 2002 |
| Brunel Computing Ltd | Information & communication | 2017 |
| Bruno Developments Limited | Construction | 2004 |
| BRW Estates Ltd | Real estate | 2017 |
| Brymbo Sports and Social Complex Limited | Arts & recreation | 1991 |
| Bryn Alco Ltd | Wholesale & retail | 2024 |
| Bryn Coch 23/12/66 Limited | Extraterritorial | 2014 |
| Bryn Darland Surgery Limited | Health & social care | 2019 |
| Bryn Farm Pen-Y-Lan Limited | Real estate | 2017 |
| Bryn Management Company Ltd. | Real estate | 2000 |
| Bryn Property Company Limited | Real estate | 1970 |
| Bryn Roberts Workshops Limited | Manufacturing | 1993 |
| Bryn Y PYS (Overton) Management Company Limited | Households | 2021 |
| Brynkinalt (Trevor) NO.1 Company Limited | Extraterritorial | 2023 |
| Brynkinalt (Trevor) NO.2 Company Limited | Extraterritorial | 2023 |
| Brynkinalt Farming Limited | Agriculture & fishing | 2013 |
| Brynkinalt Investments Limited | Real estate | 2016 |
| Brynkinalt Residential Developments Limited | Construction | 2025 |
| Bryntree Limited | Real estate | 2021 |
| BSJ Electrical Testing Ltd | Construction | 2020 |
| Bspoqe (Northwest) Ltd | Other services | 2019 |