| Ardhowen Coffee Shop Limited | Hospitality | 2019 |
| Ardore Farms Limited | Agriculture & fishing | 2022 |
| Ards Cafe Limited | Hospitality | 2026 |
| Ards Dining Limited | Hospitality | 2026 |
| Ards Eateries Limited | Hospitality | 2026 |
| Ards Enterprises Limited | Hospitality | 2023 |
| Ards Fast Foods Limited | Hospitality | 2026 |
| Ards Restaurants Limited | Hospitality | 2024 |
| ARJ Civils Ltd | Construction | 2026 |
| Arlish Homes Limited | Construction | 2017 |
| Armanach Limited | Administrative & support | 2023 |
| Armstrong Financial Solutions Ltd | Real estate | 2009 |
| Asam Properties Ltd | Real estate | 2005 |
| Ashview Trading Limited | Information & communication | 2013 |
| Asian MIX Market Limited | Wholesale & retail | 2023 |
| Asian Noodle Box Ltd | Hospitality | 2021 |
| Aspen Trading Ltd | Wholesale & retail | 2025 |
| Assert Consultancy Ltd | Administrative & support | 2023 |
| Atbec Renewables Ltd | Construction | 2022 |
| Atom Properties Ltd | Real estate | 2001 |
| Atzusni Limited | Mining & quarrying | 2023 |
| Aughakillymaude Community Association | Other services | 1990 |
| Aura Competitions Ltd | Other services | 2025 |
| Aurelius Security & Protection Ltd | Administrative & support | 2012 |
| Autism Assessment West Ltd | Health & social care | 2026 |
| Auto Moto Factory Ltd | Wholesale & retail | 2017 |
| Autodrive Ireland Ltd | Wholesale & retail | 2016 |
| Autofleet Consulting N.I Ltd | Wholesale & retail | 2025 |
| Automation UK & Ireland Ltd | Wholesale & retail | 2024 |
| Autopart Centre Limited - the | Wholesale & retail | 2004 |
| Avng Limited | Health & social care | 2020 |
| Avrio Environmental Management Limited | Professional & scientific | 2020 |
| Avrio Group Limited | Financial services | 2026 |
| Avrio Nature Solutions Limited | Water & waste | 2026 |
| Avrio Renewables Limited | Professional & scientific | 2020 |
| B & G Wines, Beers and Spirits Co Limited | Hospitality | 2026 |
| B.H.C. Limited | Manufacturing | 1995 |
| B.I.G. Contracts Limited | Construction | 2011 |
| B.Mccaffrey & Sons Limited | Mining & quarrying | 1968 |
| B4BROADWAY Limited | Wholesale & retail | 2025 |
| Baileyhil 2 Limited | Agriculture & fishing | 2018 |
| Balanced Healthcare Bhci Limited | Wholesale & retail | 2017 |
| Balcas Bioenergy Limited | Energy | 1993 |
| Balcas Limited | Manufacturing | 1962 |
| Balcas Timber Limited | Manufacturing | 1991 |
| Balla Ltd | Transport & logistics | 2024 |
| Ballabee Ltd | Wholesale & retail | 2019 |
| Ballaboats Ltd | Transport & logistics | 2024 |
| Ballabox Ltd | Real estate | 2020 |
| Balladata Ltd | Information & communication | 2024 |
| Ballinamallard Enterprise Company Limited | Real estate | 1998 |
| Ballinamallard Fisher Park | Arts & recreation | 2013 |
| Ballycassidy Sawmills Limited | Extraterritorial | 1989 |
| Ballydoolagh Enterprises Limited | Energy | 2015 |
| Ballygowan Properties Limited | Real estate | 2006 |
| Ballyhannon Park Limited | Households | 2020 |
| Ballymak BIO GAS Ltd | Extraterritorial | 2011 |
| Ballymoney Garden Centre Limited | Wholesale & retail | 1982 |
| Balmoral Spine Clinic Ltd | Health & social care | 2018 |
| Bamboo Garden (Enniskillen) Limited | Hospitality | 2020 |
| Bankfield Investments Limited | Health & social care | 1999 |
| Baron Enterprises Limited | Extraterritorial | 2007 |
| Barrole Solutions Ltd | Professional & scientific | 2025 |
| Baseline Civils Ltd | Construction | 2021 |
| Battle Camp Activity Centre Ltd | Arts & recreation | 2021 |
| Baxter Edits Ltd | Information & communication | 2020 |
| Baytree Investments Limited | Real estate | 2004 |
| Bb&D Group Ltd | Professional & scientific | 2025 |
| BBE (N.I.) Limited | Real estate | 2012 |
| Bbrdni Limited | Hospitality | 2022 |
| BD Darts Limited | Arts & recreation | 2013 |
| BE Prepped Ltd | Hospitality | 2017 |
| Beatty Hardware & Farm Supplies Ltd | Wholesale & retail | 2001 |
| Beatty Retail BM Ltd | Wholesale & retail | 2024 |
| Beatty Retail Ltd | Wholesale & retail | 2019 |
| Beautissimo Ltd | Wholesale & retail | 2021 |
| BEE Uneek Ltd. | Professional & scientific | 2012 |
| Beech Tree Hill Limited | Agriculture & fishing | 2021 |
| Beechvale Natural Water Ltd | Manufacturing | 2005 |
| Beechvale Property Management Ltd | Real estate | 2006 |
| Beeexa Ltd | Extraterritorial | 2022 |
| Beefpark NI Ltd | Wholesale & retail | 2025 |
| Bekon NET Limited | Manufacturing | 2014 |
| Belcoo Pharmacy Limited | Wholesale & retail | 2011 |
| Belgrave Holding Company Limited | Financial services | 2016 |
| Believe IT Ltd | Manufacturing | 2025 |
| Bellanaleck Partnership Limited | Real estate | 2005 |
| Belle Isle Limited | Real estate | 2001 |
| Belleek CIC | Hospitality | 2024 |
| Belleek Motor Supplies Ltd | Wholesale & retail | 2020 |
| Belmore Dental Implant & Facial Aesthetic Clinic Ltd | Health & social care | 2019 |
| Belmore Facial Aesthetics Ltd | Health & social care | 2021 |
| Belmore Holding Ltd | Financial services | 2021 |
| Belmore LAB Ltd | Administrative & support | 2021 |
| Belmore Property Investments Ltd | Extraterritorial | 2016 |
| Belmore Property Ltd | Real estate | 2021 |
| Belmore Sporting Limited | Agriculture & fishing | 2025 |
| Belmore Training Ltd | Education | 2021 |
| Belna Projects Ltd | Construction | 2026 |
| Belter Meats Ltd | Wholesale & retail | 2020 |