| Berto Trading Limited | Hospitality | 2019 |
| Bertware Limited | Wholesale & retail | 2019 |
| BES PPP Limited | Financial services | 2014 |
| Besd-Bbbb Ltd | Wholesale & retail | 2024 |
| Besd-Ovog Ltd | Wholesale & retail | 2024 |
| Bespoke Academy Ltd | Other services | 2013 |
| Bespoke Access Panels Limited | Wholesale & retail | 2022 |
| Bespoke Audio Visual Ltd | Wholesale & retail | 2018 |
| Bespoke Barbershop Belfast Ltd | Other services | 2025 |
| Bespoke Engineering Contracts Ltd | Professional & scientific | 2022 |
| Bespoke Flooring (2019) Ltd | Construction | 2019 |
| Bespoke Media Solutions Ltd | Professional & scientific | 2019 |
| Bespoke Music Solutions Ltd | Information & communication | 2024 |
| Bespoke Sofa Studio & Interiors Ltd | Manufacturing | 2022 |
| Bespro Chemicals Ltd | Manufacturing | 2002 |
| Best Buy Silicone Technology Co Limited | Wholesale & retail | 2025 |
| Best Clean UP Ltd | Wholesale & retail | 2024 |
| Best Food 125 House Limited | Hospitality | 2026 |
| Best Food House Ltd | Hospitality | 2026 |
| Best Heating Limited | Wholesale & retail | 2023 |
| Best Maintenance Services Ltd | Construction | 2017 |
| Best Mountain Limited | Wholesale & retail | 2025 |
| Best Nails Belfast Ltd | Other services | 2023 |
| Best Sincere Industry Limited | Wholesale & retail | 2025 |
| Best Technologies Solution Ltd | Wholesale & retail | 2019 |
| Best West Housing Ltd | Construction | 2019 |
| Best-Tang Limited | Wholesale & retail | 2024 |
| Best-Zaqw Ltd | Wholesale & retail | 2024 |
| Best-Zydx Limited | Wholesale & retail | 2024 |
| Besters NI Ltd | Hospitality | 2024 |
| Bestself Co Ltd | Wholesale & retail | 2024 |
| Besttex Company Holdings Ltd | Wholesale & retail | 2023 |
| Besttex Ltd | Water & waste | 2020 |
| Bestway Belfast Chemists Limited | Wholesale & retail | 2014 |
| BET2LET Ltd | Real estate | 2024 |
| Betajax Limited | | 2007 |
| Bethany Fruit Co Ltd | Wholesale & retail | 2021 |
| Bethel and Co Properties Limited | Real estate | 2025 |
| Beths Bakery Ltd | Wholesale & retail | 2024 |
| Betsy Graham Investments Ltd | Real estate | 2024 |
| Betsy Graham Properties Ltd | Real estate | 2024 |
| Better Life Talking Therapy CIC | Education | 2024 |
| Better Than One Ltd | Professional & scientific | 2025 |
| Better Things Ahead Productions Ltd | Information & communication | 2025 |
| Bettercare Capital Limited | Professional & scientific | 2017 |
| Bettercare Lucas Limited | Health & social care | 2018 |
| Betterpath Limited | Professional & scientific | 2026 |
| Betty's Cafe & Bistro Limited | Hospitality | 2024 |
| Bettychen Limited | Wholesale & retail | 2023 |
| Betu Holdings Limited | Financial services | 2006 |
| Betweenthewaves Ltd | Health & social care | 2017 |
| Bewley's Oriental Cafes Limited | Hospitality | 1991 |
| Bexley Apartments Limited | Real estate | 1982 |
| Beyond Capital Investments Limited | Financial services | 2019 |
| Beyond Kufa Unlimited | Administrative & support | 2024 |
| Beyond Limits Power Coaching Ltd | Professional & scientific | 2026 |
| Beyond Repair Ltd | Wholesale & retail | 2018 |
| Beyond Skin Clinic Ltd | Other services | 2016 |
| Beyond Skin Ltd | Education | 2019 |
| Beyond Teak NI Ltd | Professional & scientific | 2025 |
| Beyond Training & Consultation Limited | Information & communication | 2016 |
| Beyond Trends Ltd | Real estate | 2022 |
| Beyond Visible Films Ltd | Information & communication | 2022 |
| Bezaleel Engineering Ltd | Information & communication | 2024 |
| Bezaleel Limited | Real estate | 2011 |
| BF Marketing Services Ltd | Transport & logistics | 2023 |
| BF Projects Ltd | Transport & logistics | 2010 |
| Bfast Shop Ltd | Wholesale & retail | 2026 |
| Bfee Lifting Services Ltd | Administrative & support | 2025 |
| BFH Holdings Ltd | Financial services | 2024 |
| BFM Contracts Limited | Construction | 2021 |
| BFS Healthcare Ltd. | Administrative & support | 2020 |
| BFS Multiservices Ltd | Administrative & support | 2024 |
| Bfst Property Limited | Real estate | 2020 |
| BG Medical Consulting Limited | Health & social care | 2018 |
| BG Reliable FIX Ltd | Professional & scientific | 2025 |
| Bgccs Limited | Health & social care | 2019 |
| BGM Investments Limited | Real estate | 2020 |
| BGN Music CIC | Education | 2023 |
| BGS Contractors Ltd | Construction | 2016 |
| BGS Contracts Ltd | Construction | 2020 |
| BGV MGT Ltd | Real estate | 2024 |
| BH Solutions Ltd | Construction | 2016 |
| BH Wind Farm Limited | Real estate | 2014 |
| Bhaved Solutions Limited | Information & communication | 2010 |
| BHC Estates Limited | Real estate | 2016 |
| BHD Finance Limited | Extraterritorial | 2013 |
| BIA Analytical Ltd | Professional & scientific | 2018 |
| BIA Loch LAO Ltd | Hospitality | 2023 |
| BIA Rebel Limited | Extraterritorial | 2016 |
| BIA Restaurant Ltd | Hospitality | 2018 |
| BIA Support Ltd | Arts & recreation | 2020 |
| Bianchi Claudio Ltd | Wholesale & retail | 2025 |
| Bible Society Northern Ireland | Other services | 2025 |
| Bickiepegs N.I. Ltd | Manufacturing | 2023 |
| Bicter Christie Ltd | Professional & scientific | 2025 |
| Bicycle Coffee Shop Limited | Wholesale & retail | 2018 |
| Bidbank Ltd | Information & communication | 2020 |
| Biddy Farrelly's Cafe Limited | Hospitality | 2017 |
| Big and Bold Limited | Manufacturing | 2023 |