| BE There Trips Ltd | Administrative & support | 2026 |
| Beauty and Nail Bar Limited | Other services | 2019 |
| Beauty Beat Ltd | Administrative & support | 2017 |
| BEB Media Limited | Information & communication | 2008 |
| BEE Group Holding Limited | Wholesale & retail | 2024 |
| Beechdene Ltd | Wholesale & retail | 2023 |
| Beechill Development Company Limited | Construction | 2003 |
| Beelta International Limited | Wholesale & retail | 2025 |
| Begney Limited | Professional & scientific | 1999 |
| Beijing Greatwall (NI) Ltd | Hospitality | 2011 |
| Belburn Limited | Real estate | 2024 |
| Belfast and County Down Miniature Railway Society Ltd | Arts & recreation | 1991 |
| Belfast Byte Commerce Limited | Wholesale & retail | 2025 |
| Belfast City Sawmills Ltd | Manufacturing | 2018 |
| Belfast Coach Travel Ltd | Transport & logistics | 2025 |
| Belfast Containers (NI) 2000 Ltd | Administrative & support | 1999 |
| Belfast Domi Audiology Specsavers Limited | Wholesale & retail | 2024 |
| Belfast Domiciliary Specsavers Limited | Wholesale & retail | 2016 |
| Belfast DRY EYE Clinic Ltd | Health & social care | 2026 |
| Belfast Equipment Hire Limited | Administrative & support | 1971 |
| Belfast EYE and ENT Ltd | Health & social care | 2019 |
| Belfast Eyes Ltd | Health & social care | 2026 |
| Belfast Fire Studio Limited | Wholesale & retail | 2020 |
| Belfast INK Limited | Other services | 2018 |
| Belfast Locksmith Services Ltd | Other services | 2025 |
| Belfast MA Limited | Arts & recreation | 2020 |
| Belfast Original Tea Tours Ltd | Hospitality | 2025 |
| Belfast Private Ambulance Service Ltd | Health & social care | 2023 |
| Belfast Roof Repairs & Restoration Limited | Construction | 2021 |
| Belfast Skills Development Limited | Education | 2003 |
| Belfast Stays Ltd | Hospitality | 2018 |
| Belfast Ventures Ltd | Hospitality | 2021 |
| Belfastcitystays Ltd | Hospitality | 2018 |
| Bellmont Trading & Associates Ltd | Professional & scientific | 2018 |
| Belmont Plumbing Services Ltd | Construction | 2022 |
| Belsize Services Limited | Real estate | 2004 |
| Beltion Leather Limited | Wholesale & retail | 2026 |
| Bemagical Financial Brokers LLP | | 2018 |
| Bemel Properties Ltd | Real estate | 1999 |
| Benberg Brokers LLP | | 2018 |
| Bengal Lisburn Road Limited | Hospitality | 2011 |
| Bengal Lisburn Road One Limited | Hospitality | 2017 |
| Bengy Global LP | | 2019 |
| Benson Street Management Ltd | Households | 2026 |
| Bentlys Property Ltd | Real estate | 2001 |
| Benzara Properties Ltd | Real estate | 2025 |
| Bercor Associates Limited | Information & communication | 2017 |
| Bergot Ltd | Wholesale & retail | 2020 |
| Berkeley Aesthetics Limited | Health & social care | 2018 |
| Berlin Clothing Limited | Wholesale & retail | 2014 |
| Bernagh Holdings Ltd | Financial services | 2025 |
| Better Price Consulting Ltd | Financial services | 2016 |
| Beziers 6 Limited | Arts & recreation | 2024 |
| Beziers Oval Limited | Arts & recreation | 2024 |
| Beziers Rugby Limited | Arts & recreation | 2024 |
| BHA Capital Ltd | Information & communication | 2021 |
| BHC Propco Ltd | Real estate | 2026 |
| Bibr Limited | Professional & scientific | 2016 |
| BIC - Business Improvement Consulting LLP | | 2018 |
| Big Belfast Property Ltd | Real estate | 2021 |
| Big Day Apps LP | | 2022 |
| Bill Mccann Estate Agency LLP | | 2020 |
| Binder Business LP | | 2018 |
| Birdstone Enterprises Limited | Transport & logistics | 2004 |
| Birhoday Ltd | Wholesale & retail | 2026 |
| BJG Consultants (N.I.) Ltd | Professional & scientific | 2019 |
| BKR & Associates LLP | | 2018 |
| Black Belts Capital LP | | 2021 |
| Black Hive Digital Ltd | Information & communication | 2023 |
| Black Label Holdings Ltd | Financial services | 2025 |
| Black Point Perfumes Ltd | Wholesale & retail | 2024 |
| Blackburn Agri Limited | Agriculture & fishing | 2021 |
| Blackthorn Manor Management Company Limited | Households | 2022 |
| Blaeberry Press Limited | Information & communication | 2015 |
| Blaris Properties Ltd | Real estate | 2014 |
| Blue Rose Global Limited | Other services | 2020 |
| Blue Sky Capital LLP | | 2017 |
| Bluechip Technologies Holdings Limited | Information & communication | 2000 |
| Bluemoon Systems and Software Ltd. | Professional & scientific | 2018 |
| Blush Boutique Limited | Wholesale & retail | 2005 |
| BM Agile Consultancy Ltd | Information & communication | 2025 |
| BM Construction Services (N.I.) Limited | Construction | 2026 |
| BMC Installations Limited | Information & communication | 2015 |
| BMD Holdings Ltd | Financial services | 2018 |
| BML Transport (NI) Limited | Transport & logistics | 2014 |
| Bodega Imaging Limited | Health & social care | 2024 |
| Bodel Distributors Limited | Wholesale & retail | 2016 |
| Bogno Market LP | | 2017 |
| Boilerhouse Services Limited | Manufacturing | 1977 |
| Bolts & Blades Ltd | Manufacturing | 2020 |
| Bona Hong Kong Technology Limited | Wholesale & retail | 2026 |
| Boomer Industries Limited | Manufacturing | 1970 |
| Boomer MBO LLP | | 2007 |
| Borsa DAO LP | | 2021 |
| Boston Grill Limited | Hospitality | 2024 |
| Boundary Fitness Ltd | Arts & recreation | 2022 |
| Boundary Training Ltd | Arts & recreation | 2020 |
| Boutique NO 1 LP | | 2014 |
| Bowden Property Limited | Real estate | 2017 |
| BP Corporate Ltd | Extraterritorial | 2024 |