| AXN Solutions Limited | Professional & scientific | 2011 |
| B C Garden Design Limited | Professional & scientific | 2023 |
| B L Management Company (N.I.) Limited | Households | 2023 |
| B2 Engineering Solutions Ltd | Manufacturing | 2016 |
| Backstreets Kitchen Ltd | Hospitality | 2024 |
| BAD BOY Vapes Ltd | Wholesale & retail | 2020 |
| Baebyha Ltd | Wholesale & retail | 2025 |
| Bailie Property Management Ltd | Real estate | 2000 |
| Balerno Interiors Ltd | Manufacturing | 2023 |
| Ballantine Garden Village Management Company Limited | Households | 2007 |
| Ballinderry (Richlea) Management Limited | Households | 2008 |
| Ballinderry Management Company Limited | Households | 2005 |
| Ballintray Contracts Limited | Wholesale & retail | 2020 |
| Ballyrobert Manor Management Company Ltd | Households | 2018 |
| Ballytweedy Dale Management Company Ltd | Households | 2021 |
| Balmoral Estates Property Management Limited | Households | 2025 |
| Balmoral Gate Limited | Extraterritorial | 2020 |
| Barcbuild N.I. Ltd | Construction | 2022 |
| Barns Mills Management Company Limited | Households | 2004 |
| Baronscourt Manor Management Company Ltd | Real estate | 2016 |
| Barsouth Sports Ltd | Wholesale & retail | 2024 |
| Barsouth Sportswear Ltd | Wholesale & retail | 2025 |
| Basalt Property Ltd | Real estate | 2026 |
| Bashford Gate Management Company Ltd | Households | 2025 |
| Bashforde Management Company Limited | Households | 2019 |
| Battleram Studios Ltd | Information & communication | 2025 |
| Bccm Ltd | Other services | 2025 |
| BCW Advisory Limited | Hospitality | 2020 |
| BDE Secure Power Ltd | Manufacturing | 2016 |
| Be-Youthiful Beauty Limited | Other services | 2024 |
| Beard Grips Ltd | Information & communication | 2017 |
| Beattie Facilities Ltd | Construction | 2025 |
| Belfast City Skinworks (Holdings) Ltd | Arts & recreation | 2018 |
| Belfast City Skinworks (N.I.) Ltd | Arts & recreation | 2018 |
| Belfast Coffee Roasters Ltd | Manufacturing | 2017 |
| Belfast Knead Limited | Hospitality | 2024 |
| Belfast Pizza Lads Ltd | Hospitality | 2022 |
| Belle Fleur & Co Aesthetics Ltd | Health & social care | 2024 |
| Belmont Spas Ltd | Other services | 2024 |
| Beltoy Investments Limited | Construction | 1980 |
| Belvedere Development Management Company (NO 2) Limited | Households | 2013 |
| Belvedere Development Management Company Limited | Households | 2003 |
| Benecafe Ltd | Hospitality | 2023 |
| Bentayga Companies Limited | Wholesale & retail | 2024 |
| Berkeley Hall Court Management Limited | Households | 2004 |
| BEU777 Limited | Other services | 2024 |
| Beyond Signage Ltd | Professional & scientific | 2009 |
| BGB Electrical (N.I.) Ltd | Construction | 2026 |
| BHM Fabrication Ltd | Professional & scientific | 2022 |
| Big Ying Limited | Hospitality | 2024 |
| Bill Webb Limited | Wholesale & retail | 1999 |
| Birch Theatre Ltd | Arts & recreation | 2025 |
| Bishopshill Management Company Limited | Households | 2004 |
| Bitronix Cryptoworks Limited | Extraterritorial | 2018 |
| Black Diamond Renovations Ltd | Construction | 2020 |
| Blackbird Design Ltd | Professional & scientific | 2023 |
| Blacks Gate Apartments Management Company Limited | Households | 2025 |
| Blackthorn Building & Maintenance Ltd | Construction | 2022 |
| Blades Management Services Limited | Households | 1985 |
| Blank Supply Ltd | Wholesale & retail | 2023 |
| Blastoffni Limited | Other services | 2010 |
| Bluestone Hall Development Management Company Limited | Households | 2005 |
| BM Manufacturing Ltd | Manufacturing | 2018 |
| BND Solutions Ltd | Wholesale & retail | 2025 |
| Bodrum Kebabs Ltd | Wholesale & retail | 2017 |
| Bodrum Pizza House N.I. Ltd | Wholesale & retail | 2025 |
| Bolder Inspection Ltd | Professional & scientific | 2015 |
| Boneybefore Ltd. | Real estate | 2011 |
| Boost Hockey Academy Limited | Arts & recreation | 2022 |
| Bosca Ltd | Professional & scientific | 2026 |
| Boxite Limited | Manufacturing | 2007 |
| Boyce Anderson Motors Limited | Extraterritorial | 1973 |
| Brackenridge Foods Ltd | Wholesale & retail | 2012 |
| Brackenridge Restaurants Ltd | Hospitality | 2024 |
| Braehead Apparel Limited | Wholesale & retail | 2024 |
| Brecosu Weil Ltd | Wholesale & retail | 2025 |
| Bricam Ltd | Manufacturing | 2021 |
| Bricks and KIN Ltd | Wholesale & retail | 2025 |
| Bridewell House of Beauty Nail Supplies Limited | Wholesale & retail | 2022 |
| Bridewells House of Beauty Limited | Other services | 2017 |
| Brill Design Ltd | Professional & scientific | 2012 |
| Brixy Properties Ltd | Real estate | 2026 |
| BRL Catering Ltd | Hospitality | 2020 |
| Brook Avenue 1960 Limited | Extraterritorial | 2014 |
| BS Aero Ltd | Manufacturing | 2025 |
| BUA Ltd | Manufacturing | 2009 |
| Burnbrae Properties Limited | Households | 1986 |
| Buskin Place Management Limited | Real estate | 2007 |
| Butlers Barber Shop Limited | Other services | 2018 |
| BWF Hosting Limited | Information & communication | 2013 |
| Bytesupplies Limited | Wholesale & retail | 2025 |
| C & H Electrical | Manufacturing | 2013 |
| C & H Electrical Services (Antrim) Limited | Manufacturing | 2023 |
| C&S Butcher & Catering Ltd | Manufacturing | 2022 |
| C-Mac Network Systems Limited | | 2001 |
| Cable Apartments Limited | Households | 2025 |
| Cadhan Limited | Real estate | 2013 |
| Calixta Design Ltd | Arts & recreation | 2025 |
| Calliee Limited | Wholesale & retail | 2025 |
| Camni Logistics Ltd | Transport & logistics | 2024 |