| Ballycrummy Developments Ltd | Construction | 2024 |
| Ballyeden Group Ltd | Professional & scientific | 2011 |
| Ballyharden Holdings Limited | Hospitality | 2021 |
| Ballyhoe Bridge Holdings Ltd | Real estate | 2020 |
| Ballyhoy Farms Ltd | Agriculture & fishing | 2022 |
| Ballyloughan Stables Limited | Agriculture & fishing | 2025 |
| Ballymac Builders Ltd | Construction | 2012 |
| Ballymooney Foods UK Limited | Wholesale & retail | 2011 |
| Ballymoran Construction Ltd | Construction | 2022 |
| Ballysarran Drainage & Groundwork Ltd | Construction | 2025 |
| Ballywillan Ltd | Hospitality | 2025 |
| Balteagh Farms Ltd | Agriculture & fishing | 2025 |
| Bare and Bronze Limited | Other services | 2022 |
| Bare Marketing Limited | Other services | 2024 |
| Baridek Services (NI) Ltd | Construction | 2018 |
| Barney Bowl Foundation | Other services | 2024 |
| Barros D'Sa & Leyburn Limited | Arts & recreation | 2018 |
| Barry Hughes Transport Limited | Transport & logistics | 2019 |
| BAS Account Services Ltd | Extraterritorial | 2010 |
| Basecamp Technical Ltd | Information & communication | 2021 |
| Basil Sheils Bar & OFF Sales Ltd | Hospitality | 2023 |
| Basil Sheils Bar & Provisions Ltd | Wholesale & retail | 2023 |
| Basil Sheils Bar & Restaurant Ltd | Hospitality | 2019 |
| BCD Contracts Ltd | Construction | 2017 |
| Beagan Transport Ltd | Transport & logistics | 2025 |
| Beauty DOT Studio Ltd | Health & social care | 2025 |
| Beech Hill Investments Limited | Real estate | 2013 |
| Beechhill Property Management Ltd | Real estate | 2019 |
| Beechtree Farm Limited | Agriculture & fishing | 2014 |
| Belarm Properties Limited | Real estate | 2016 |
| Bella Blue Décor Ltd | Wholesale & retail | 2021 |
| Belmont Farms Limited | Agriculture & fishing | 1991 |
| Bespoke Stone Surface NI Ltd | Manufacturing | 2024 |
| Bethesda Building Solutions Ltd | Construction | 2025 |
| Bhloscaidh Enterprises Limited | Real estate | 2015 |
| Bilinco Limited | Administrative & support | 2025 |
| Bitz 4 Work Limited | Wholesale & retail | 2015 |
| Bjcs Coffee Limited | Hospitality | 2020 |
| BJS Bricklaying Ltd | Construction | 2022 |
| BJV Ltd | Hospitality | 2019 |
| Black Mountain Property Ltd | Real estate | 2023 |
| Black Solutions Ltd | Manufacturing | 2013 |
| Black's Nursery Limited | Agriculture & fishing | 2006 |
| Black's Tractors Limited | Wholesale & retail | 2014 |
| Blackberry Road Farm Ltd | Agriculture & fishing | 2012 |
| Blackwater Private Clinic Ltd | Health & social care | 2021 |
| Blackwater Skin Ltd | Health & social care | 2026 |
| Black’S Horticulture Limited | Agriculture & fishing | 2022 |
| Blambed Ltd | Information & communication | 2015 |
| Blaney Pharmacies Ltd | Wholesale & retail | 2013 |
| Bloomhill Cars Ltd | Wholesale & retail | 2019 |
| Blossoms&Brew Ltd | Hospitality | 2025 |
| Blue Bridge Properties Limited | Real estate | 2017 |
| BMA Utilities Limited | Construction | 2016 |
| BMB Property Rentals Ltd | Real estate | 2025 |
| BMC Brickwork Limited | Construction | 2019 |
| BMC Services Limited | Construction | 2021 |
| BMN Distribution Limited | Wholesale & retail | 2005 |
| BMV Promotions Ltd | Wholesale & retail | 2024 |
| BOH Properties Ltd | Construction | 2022 |
| Border Self Storage Ltd | Transport & logistics | 2021 |
| Borderless Agencies Limited | Wholesale & retail | 2025 |
| Borderline Tiles Ltd | Wholesale & retail | 2013 |
| Boron Construction Limited | Construction | 2017 |
| Boron Developments Limited | Real estate | 2017 |
| Boron Holdings Ltd | Construction | 2015 |
| Boron Inns Ltd | Financial services | 2022 |
| Bosco Arts Ltd | Education | 2020 |
| Boylan Commercials Ltd | Wholesale & retail | 2018 |
| Boylan Transport Ltd | Transport & logistics | 2016 |
| BP Joinery Contracts Ltd | Construction | 2017 |
| BP Plant Sales Limited | Wholesale & retail | 2018 |
| BP Property and Services Ltd | Real estate | 2025 |
| Brackley Dairies Limited | Agriculture & fishing | 2017 |
| Brackly Electrical Services Ltd | Construction | 2019 |
| Brackly Property Management Ltd | Real estate | 2025 |
| Bracknagh Consultancy Services Ltd | Professional & scientific | 2024 |
| Bradbury Opco Ltd | Hospitality | 2026 |
| Bramley Haven Ltd | Hospitality | 2022 |
| BRC Services Ltd | Information & communication | 2021 |
| Breen Catering Limited | Hospitality | 2016 |
| Breen Real Estate Limited | Real estate | 2025 |
| Brian Short & Co Ltd | Professional & scientific | 2012 |
| Bribar Construction Ltd | Construction | 2012 |
| Bridge Motor Works (Dromore) Limited | Wholesale & retail | 1964 |
| Bridgewater Properties Ireland Ltd | Real estate | 2024 |
| Bright Vision Accountancy Limited | Professional & scientific | 2019 |
| Bronze (NI) Limited | Other services | 2010 |
| Bronze International Ltd | Professional & scientific | 2025 |
| Brookwood Clinic Ltd | Health & social care | 2022 |
| Brookwood Kitchens Ltd | Manufacturing | 2011 |
| Broughan Ltd | Real estate | 2021 |
| Broughan Transport Ltd | Transport & logistics | 2013 |
| BSB Tassagh Ltd | Hospitality | 2025 |
| Buckman Property Management Ltd | Real estate | 2025 |
| Buildtec Innovations (NI) Limited | Construction | 2019 |
| Burren Balsamics Ltd | Manufacturing | 2014 |
| Bush Road Developments Ltd | Construction | 2022 |
| Business Account Services Ltd | Professional & scientific | 2015 |
| BW Engineering Equipment Ltd | Professional & scientific | 2024 |