| Barry Essential Store Ltd | Wholesale & retail | 2025 |
| Barry EYE Centre Limited | Health & social care | 1985 |
| Barry Fresh Market Ltd | Wholesale & retail | 2026 |
| Barry Fruit & VEG Ltd | Wholesale & retail | 2025 |
| Barry Grill Ltd | Hospitality | 2025 |
| Barry Gymnasium Limited | Health & social care | 2003 |
| Barry International Foods Ltd | Wholesale & retail | 2024 |
| Barry Island Coffee Company Ltd | Manufacturing | 2026 |
| Barry Island Inns Ltd | Hospitality | 2016 |
| Barry Island Leisure Ltd | Arts & recreation | 2020 |
| Barry Island Retail Ltd | Wholesale & retail | 2024 |
| Barry Island Spirits Co Limited | Wholesale & retail | 2020 |
| Barry Masonic Hall Trust Company Limited(The) | Hospitality | 1905 |
| Barry Meal Limited | Hospitality | 2020 |
| Barry Nails & Beauty Limited | Other services | 2022 |
| Barry Online Sales Limited | Wholesale & retail | 2024 |
| Barry Order Limited | Hospitality | 2024 |
| Barry Road Hand Car Wash Ltd | Wholesale & retail | 2026 |
| Barry Romilly Bowling Club Limited | Arts & recreation | 2019 |
| Barry Rugby Football Club Limited | Arts & recreation | 2017 |
| Barry Star Limited | Hospitality | 2025 |
| Barry Tabernacl Studios CIC | Information & communication | 2022 |
| Barry Therapy Centre Ltd | Health & social care | 2021 |
| Barry Town United AFC | Arts & recreation | 2009 |
| Barry WAR Museum and Heritage Centre CIC | Arts & recreation | 2023 |
| Barry Yacht Club | Arts & recreation | 2001 |
| Battle Bling Limited | Wholesale & retail | 2016 |
| Bay 5 Limited | Extraterritorial | 2025 |
| Bayarch Limited | Health & social care | 2013 |
| Baymarine Services (Marine) Limited | Administrative & support | 2005 |
| Bayroon Solutions Ltd | Administrative & support | 2026 |
| BB Scaffold Services Ltd | Construction | 2026 |
| BC18 Limited | Hospitality | 2018 |
| BCAUTOS#1 Ltd | Wholesale & retail | 2025 |
| BDS Scaffold Limited | Construction | 2023 |
| BDTHOMAS2 Limited | Professional & scientific | 2025 |
| BE Bespoke Ltd | Wholesale & retail | 2022 |
| Beable Ltd | Financial services | 2017 |
| Beacon Building Contractors Ltd | Construction | 2014 |
| Beacon House Barry RTM Company Ltd | Households | 2018 |
| Beaconsfield (Barry) Limited | Households | 1981 |
| Bear Head Conversions Limited | Wholesale & retail | 2021 |
| Beauty Health Dent Ltd | Health & social care | 2022 |
| Beauty Shed Studio Limited | Other services | 2021 |
| Beej Cofffee Limited | Manufacturing | 2025 |
| Beir Limited | Professional & scientific | 2019 |
| Bekkam PVT Ltd | Hospitality | 2022 |
| Bell Property Group Ltd | Real estate | 2024 |
| Bellaciao Restaurant Ltd | Hospitality | 2019 |
| Bellavista Nursing Homes(Wales) Ltd | Health & social care | 2011 |
| Beloved Boutique (Barry) Ltd | Wholesale & retail | 2021 |
| BEN Jones Building Contractor Ltd | Construction | 2024 |
| BEN Pearson Ltd | Health & social care | 2009 |
| Ben&Justine Limited | Health & social care | 2023 |
| Berridge Roofing & Chimney Specialist Ltd | Construction | 2026 |
| Bespoke Boxing Ltd | Wholesale & retail | 2024 |
| Best One (Barry) Ltd | Wholesale & retail | 2020 |
| Best Technology Solution Ltd | Professional & scientific | 2025 |
| Best Valeting Services Ltd | Wholesale & retail | 2025 |
| Bestie Nails Ltd | Other services | 2025 |
| Beyond Running Fitness Ltd | Education | 2018 |
| BGJ Accountants Ltd | Extraterritorial | 2025 |
| Bier Keller Pizza Limited | Hospitality | 2022 |
| Big Fresh Catering Limited | Hospitality | 2019 |
| Binding Contractors Limited | Professional & scientific | 2019 |
| Birchberry Limited | Arts & recreation | 2007 |
| BIT & Byte Enterprises CIC | Wholesale & retail | 2025 |
| BIV Limited | Construction | 2021 |
| Bjpp Limited | Real estate | 2017 |
| BKR (Wales) Limited | Construction | 2014 |
| BL Data Solutions Ltd | Information & communication | 2025 |
| Black Lion FM Limited | Administrative & support | 2021 |
| Blackcat Construction Services Limited | Construction | 2025 |
| Blackletter Games Ltd | Manufacturing | 2017 |
| Blackstone Company in Cardiff Ltd | Wholesale & retail | 2018 |
| Blaines Flames Logburners Ltd | Construction | 2023 |
| Blakeridge Limited | Health & social care | 2011 |
| Blasus Succulent Emporium Limited | Agriculture & fishing | 2020 |
| Blayney Accountancy Limited | Professional & scientific | 2012 |
| Blockridge Limited | Financial services | 2023 |
| Blod Pharma Ltd | Wholesale & retail | 2024 |
| Blonde Ambition (Wales) Limited | Other services | 2014 |
| Blue Oak Audio Ltd | Arts & recreation | 2015 |
| Blue Ridge Canine Academy Ltd | Administrative & support | 2014 |
| Blue Skies Travel Limited | Administrative & support | 2021 |
| Blue Sponge Cleaning Company Ltd | Other services | 2017 |
| Bluebird Aero Ltd | Manufacturing | 2025 |
| Bluebird Property Management Ltd | Real estate | 2022 |
| Bluefix Property Solution Limited | Construction | 2026 |
| Blueprint Planning Ltd | Agriculture & fishing | 2024 |
| Blurr Promotions Ltd | Professional & scientific | 2026 |
| BM Accountancy & Advisory Ltd | Professional & scientific | 2024 |
| BMD Pipework Ltd | Construction | 2024 |
| BMG Bruin Ltd | Health & social care | 2022 |
| Bnbee Limited | Real estate | 2023 |
| Bnro Ltd | Real estate | 2024 |
| BNT Cymru Limited | Information & communication | 2003 |
| Boba Base Ltd | Hospitality | 2020 |
| Boba Time Cardiff Limited | Hospitality | 2024 |
| Boba Time Newport Limited | Hospitality | 2022 |