| Ashers Ballyeaston Road Ltd | Wholesale & retail | 2021 |
| Aspen Mulbery Investments Limited | Hospitality | 2015 |
| Asphalt and Aggregates Trading Limited | Construction | 2016 |
| Atmosphere Agency Ltd | Professional & scientific | 2011 |
| Aurora Audiology Ltd | Wholesale & retail | 2024 |
| Automedia (NI) Ltd | Professional & scientific | 2011 |
| Autumn Archer Author Ltd | Information & communication | 2022 |
| Avontel Limited | Information & communication | 2011 |
| Axitex Ltd | Manufacturing | 2025 |
| B & a Rentals Limited | Real estate | 2022 |
| B-On Fitness Limited | Arts & recreation | 2022 |
| B. Craig & Co. Limited | Wholesale & retail | 1977 |
| B.P. Management Ltd | Real estate | 2010 |
| Bachelors Avenue Property Management Ltd | Extraterritorial | 2008 |
| Baines Bakery Limited | Manufacturing | 2019 |
| Ballad Developments Ltd | Construction | 2012 |
| Ballad Mews Management Ltd | Extraterritorial | 2013 |
| Ballybarnes Land Management Ltd | Households | 2017 |
| Ballybracken Consulting Ltd | Professional & scientific | 2026 |
| Ballycairn Holdings Ltd | Wholesale & retail | 2016 |
| Ballyclare Community Enterprises Limited | Administrative & support | 2005 |
| Ballyclare Fuels Ltd | Wholesale & retail | 2020 |
| Ballyclare Nails & Spa Limited | Other services | 2024 |
| Ballyclare RFC Ltd | Arts & recreation | 2025 |
| Ballyclare Self Storage Ltd | Transport & logistics | 2019 |
| Ballyclare Tyre Centre Ltd | Wholesale & retail | 2023 |
| Ballycorr Lodge Management Company Limited | Households | 2013 |
| Ballycorr Road Mews Management Company Limited | Households | 2016 |
| Ballycullen (Newtownards) Management Ltd | Households | 2017 |
| Ballyeaston Road Apartments Ltd | Extraterritorial | 2008 |
| Ballyhamage Farms Ltd | Construction | 2009 |
| Ballyhamage Management Limited | Extraterritorial | 2006 |
| Ballyhenry Mews Property Management Ltd | Extraterritorial | 2008 |
| Ballyloren Apartments Ltd | Extraterritorial | 2006 |
| Ballynagilliagh Mews Land Management Ltd | Households | 2016 |
| Ballynahinch Road Management Company Limited | Households | 2018 |
| Ballynashee Properties Limited | Construction | 2024 |
| Ballyneill Land Management Ltd | Extraterritorial | 2003 |
| Ballynure Foods Limited | Hospitality | 2019 |
| Ballyoran Manor Management Company Limited | Households | 2005 |
| Ballyrobert Trailers Limited | Transport & logistics | 2012 |
| Ballyronan Management Company Limited | Extraterritorial | 2008 |
| Ballyvarnet Lane Management Ltd | Households | 2018 |
| Ballyvoy Property Limited | Real estate | 2021 |
| Balmoral Holdings PTY Ltd | Professional & scientific | 2020 |
| Balon UK Ltd | Wholesale & retail | 2021 |
| Bannvale Holdings Limited | Transport & logistics | 2017 |
| Bannview Court Management Ltd | Households | 2015 |
| Barklie Grove Limited | Households | 2011 |
| Barnfield Manor Apartments Management Co Ltd | Extraterritorial | 2009 |
| Baronsgrange Carryduff Management Company Limited | Households | 2016 |
| Barrack Street Property Management Ltd | Extraterritorial | 2007 |
| BCF Holdings Ltd | Financial services | 2023 |
| Beech Hill (Larne) Management Ltd | Households | 2017 |
| Beech Hill (NO 3) Management Ltd | Households | 2022 |
| Beechview Apartments Management Limited | Households | 2017 |
| Beechview Management NO. 2 Ltd | Extraterritorial | 2002 |
| Beechview Management NO.1 Ltd | Extraterritorial | 2001 |
| Beechwood Laboratories Limited | Professional & scientific | 2003 |
| Belfast Platform for the Arts | Arts & recreation | 2009 |
| Belfast Platter Ltd | Hospitality | 2018 |
| Belfast Tea House Ltd | Hospitality | 2024 |
| Bellevue Estates NI Ltd | Extraterritorial | 2003 |
| Bellevue Manor Limited | Extraterritorial | 1998 |
| Benamara Properties Limited | Administrative & support | 1995 |
| Benavon Court Management NO. 1 Limited | Households | 1992 |
| Bent Metal Consulting Ltd | Information & communication | 2026 |
| Bentragh Hall Land Management Ltd | Households | 2026 |
| Berkeley Hall Management Limited | Households | 2004 |
| Berkeley Hughes Limited | Financial services | 2026 |
| Bernard Hughes Bakery Limited | Manufacturing | 2019 |
| Bert's Recovery Ltd | Administrative & support | 2026 |
| Beshouse Residential Properties Limited | Administrative & support | 1989 |
| Beyond Performance 4X4 Ltd | Wholesale & retail | 2015 |
| BFS Traders Ltd | Wholesale & retail | 2024 |
| Black Arch Software Solutions Limited | Information & communication | 2018 |
| Blacksmith Corner Apartments Ltd | Extraterritorial | 2008 |
| Blades & Beauty Limited | Other services | 2022 |
| Blessington Court Management Services Ltd | Administrative & support | 1997 |
| Bleubird Limited | Manufacturing | 2019 |
| Blood & Canvas Ltd | Manufacturing | 2025 |
| Blooming Communications NI Ltd | Professional & scientific | 2025 |
| Blooms Tea Rooms Ltd | Hospitality | 2022 |
| Bloomsdale Management Limited | Households | 2016 |
| Blue Lily Consulting Ltd | Administrative & support | 2025 |
| Blue Skies Group Ltd | Wholesale & retail | 2016 |
| Blythswood Ireland Limited | Wholesale & retail | 2004 |
| BNI Compare Ltd | Financial services | 2024 |
| BNI Travel Club Ltd | Administrative & support | 2024 |
| BO Gadget Ltd | Wholesale & retail | 2026 |
| Bocombra Hill Management Co.Ltd | Households | 2005 |
| Bodcon Inner Circle Ltd | Other services | 2025 |
| Bolands Bakery Limited | Manufacturing | 2020 |
| Boldbridge Ltd | Real estate | 2023 |
| Boom Properties Ltd | | 2007 |
| Bothar Construction Limited | Construction | 2017 |
| Bothar Inns Limited | Hospitality | 2017 |
| Bothwell Black Property Ltd | Real estate | 2022 |
| Bracken Bawn Management Co Ltd | Households | 2018 |
| Bradley Testing and Consulting Limited | Professional & scientific | 2018 |