| BD Plant Hire & Sales Ltd | Construction | 2016 |
| BE a Queen Beauty & Lashes Ltd | Other services | 2020 |
| BE Almai Ltd | Wholesale & retail | 2020 |
| Bead Screed Insulation Ltd | Construction | 2026 |
| Beam Foods Limited | Manufacturing | 2024 |
| Beattie Livestock Sales Ltd | Wholesale & retail | 2017 |
| Beechill Access Ltd | Financial services | 2024 |
| Bees Furniture and Electrical Goods Ltd | Wholesale & retail | 2026 |
| Bellham Limited | Construction | 2021 |
| Bellino Living Ltd | Wholesale & retail | 2024 |
| Bellview Holdings Ltd | Financial services | 2025 |
| Bellwood Property Ltd | Financial services | 2026 |
| Beltany Farming Co Ltd | Wholesale & retail | 2016 |
| Beltany Poultry Ltd | Agriculture & fishing | 2021 |
| Beltec Civil's Ltd | Construction | 2023 |
| Benchmark Sports Technology Limited | Information & communication | 2025 |
| Benford Limited | Real estate | 2011 |
| Beng (N.I) Ltd | Manufacturing | 2026 |
| Beng Group Ltd | Manufacturing | 2023 |
| Benn Properties Limited | Real estate | 2004 |
| Beragh Plumbing & Heating Ltd | Construction | 2022 |
| Better YOU Nutrition Ltd | Other services | 2025 |
| Bfdf Ltd | Agriculture & fishing | 2018 |
| BFO Training Limited | Other services | 2023 |
| Big West Holdings Limited | Administrative & support | 2021 |
| Bilmaw Ltd | Professional & scientific | 2016 |
| Binary Digits Ltd. | Information & communication | 2018 |
| Biogrid Limited | Extraterritorial | 2015 |
| Biogrid Omagh | Manufacturing | 2015 |
| Biomass Renewable Energy Ltd | Energy | 2015 |
| Birch Tree Company NO 2 Limited | Real estate | 2014 |
| Bistro 6IXTEEN Ltd | Hospitality | 2023 |
| Bitta Banter Group Ltd | Information & communication | 2024 |
| BKC Contracts Ltd | Construction | 2017 |
| Blackfort Range Limited | Arts & recreation | 2021 |
| Blackhill Quarries Ltd | Extraterritorial | 2008 |
| Blackline Trading Ltd | Wholesale & retail | 2024 |
| Blair Jones Ltd | Construction | 2026 |
| Bloomfield Property Developments Limited | Construction | 2006 |
| BLS Holdings Ltd | Professional & scientific | 2017 |
| Blue Ridge Developments NI Ltd | Construction | 2019 |
| Blue Tree Hospitality Ltd | Hospitality | 2022 |
| Blueberry Moon Studio Ltd. | Manufacturing | 2021 |
| BM Campbell Properties Ltd | Real estate | 2014 |
| BM Contracts Services Ltd | Construction | 2023 |
| BM Plasterboarding Ltd | Construction | 2025 |
| Bmax IT Solutions Ltd | Information & communication | 2019 |
| BMC Concrete Ltd | Construction | 2014 |
| BML Contracts (N.I.) Ltd | Construction | 2017 |
| BMN Contracts Ltd | Construction | 2018 |
| BN Contracts Limited | Construction | 2016 |
| Bngc Consultancy Limited | Professional & scientific | 2015 |
| BO & Andy's Ltd | Hospitality | 2022 |
| Boaz Properties Ltd. | Construction | 1987 |
| Body Active Functional Medicine Clinic Ltd | Health & social care | 2021 |
| Boneyard Records Limited | Arts & recreation | 2023 |
| Boorinroe Ltd | Health & social care | 2015 |
| Boxer Trading Ltd | Wholesale & retail | 2023 |
| Boyd Bedding (N.I.) Ltd | Manufacturing | 2018 |
| Boyd Bedding Ltd | Manufacturing | 2013 |
| Boyd Renewables Limited | Energy | 2012 |
| Boyturn Farms Limited | Agriculture & fishing | 2017 |
| BP Maguire Ltd | Wholesale & retail | 2009 |
| BPM Contracts (N.I.) Ltd | Construction | 2019 |
| BR Energy Limited | Energy | 2016 |
| Brackagh Poultry Ltd | Agriculture & fishing | 2025 |
| Brackenfield Properties Limited | Real estate | 2017 |
| Brackens Ballycumber Limited | Wholesale & retail | 2023 |
| Bradan Developments Ltd. | Professional & scientific | 2021 |
| Bradkeel Social Farm CIC | Health & social care | 2014 |
| Bradley Camera Services Limited | Other services | 2015 |
| Bradley Construction (MF) Ltd | Construction | 2020 |
| Bradley Financial Services Ltd | Financial services | 2014 |
| Braelight Ltd | Education | 2020 |
| Brass Knucks Ltd | Information & communication | 2024 |
| Brehon Skincare Ltd | Manufacturing | 2025 |
| Brendan Loughran & Sons Ltd | Construction | 2003 |
| Brennan's Bar Limited | Wholesale & retail | 2020 |
| Brexit Movers Limited | Financial services | 2025 |
| Brick Block Construction Ltd | Construction | 2017 |
| Bricon Solutions Ltd | Construction | 2021 |
| Bridgewood Contracts Limited | Professional & scientific | 2017 |
| Bright Stationery Limited | Wholesale & retail | 2022 |
| Brightside Coaching Ltd | Arts & recreation | 2025 |
| Britesmile (Omagh) Limited | Health & social care | 2005 |
| Broclan Retail Limited | Hospitality | 2014 |
| Broderick's (Omagh) Ltd | Hospitality | 2019 |
| Bronagh Starrs Creative Ltd | Arts & recreation | 2025 |
| Bronagh Starrs Ltd | Education | 2024 |
| Brookmount Limited | Real estate | 2026 |
| Broomco (3113) Limited | | 1998 |
| Bryan Johnston Car Sales Ltd | Information & communication | 2017 |
| BSI Wind Ltd | Energy | 2014 |
| BT20 Property Ltd | Real estate | 2022 |
| BTA Global Trading Ltd | Wholesale & retail | 2026 |
| Buchanans of Cavandarragh Ltd | Agriculture & fishing | 2016 |
| Buddies Childtime Centre Ltd | Health & social care | 2012 |
| Bulk Tranz Haulage Ltd | Transport & logistics | 2020 |
| Burnhead Rural Services Ltd | Agriculture & fishing | 2018 |
| Butterlope Farm CIC | Other services | 2015 |