| A & C Maginn Limited | Wholesale & retail | 2006 |
| A & D Trading Limited | Financial services | 2006 |
| A.W. Hamilton Engineers Limited | Manufacturing | 2002 |
| ABC Electrical Services Limited | Construction | 2004 |
| ABX Logistics Ireland Limited | | 1981 |
| Active Health Solutions Limited | Health & social care | 2006 |
| Adair Properties Ltd | Real estate | 2000 |
| Advanced Business Enterprises Ltd | Extraterritorial | 2009 |
| Agricultural Vehicle Warranties Limited | | 1997 |
| Alan Cook Architects Limited | Professional & scientific | 2005 |
| Alexander Hanna Limited | Wholesale & retail | 1958 |
| Alexandra Real Estate Limited | Extraterritorial | 2000 |
| Anglo Beef Processors Limited | | 1995 |
| Ardkeen Limited | Wholesale & retail | 2000 |
| Arlington Hotel (NI) Limited | Hospitality | 1999 |
| Armagh Gold Limited | Mining & quarrying | 2001 |
| Armstrong Beattie Tyres, Exhaust & Service Centre Ltd | Wholesale & retail | 2004 |
| Ashdene Grange Management Limited | Households | 1987 |
| ASM Alternative Feeds Limited | Manufacturing | 2007 |
| Association of Old Vehicle Clubs in Northern Ireland Limited - the | Other services | 1979 |
| Auto Windscreens & Motor Spares (NI) Limited | Wholesale & retail | 1994 |
| B&P Property Developments Limited | Construction | 2006 |
| B.L.B.M. Limited | | 1997 |
| Ballantyne Hollinger Limited | Professional & scientific | 2001 |
| Ballinran Community Association | Other services | 2003 |
| Ballycross Contracts Limited | Construction | 2002 |
| Ballymagee Investment Company,Limited | Construction | 1961 |
| Ballymagee Management Services Limited | Households | 1993 |
| Ballywalter Construction Limited | Construction | 1978 |
| Banbridge District Enterprises Limited | Real estate | 1989 |
| Bann House Ltd | Real estate | 2005 |
| Bannview Properties Limited | Real estate | 1986 |
| Baskets Galore Ltd | Wholesale & retail | 2005 |
| Bathroom ETC Ltd | Wholesale & retail | 2008 |
| Bavan Holdings Ltd | Financial services | 2026 |
| BEE BEE Developments Limited | Construction | 1992 |
| Beeches Catering Services Limited - the | Real estate | 2000 |
| Belfast Locksmiths Limited | Extraterritorial | 2002 |
| Bell Security (N.I.) Limited | | 1991 |
| Belltron Ireland & U.K. Ltd | Manufacturing | 2003 |
| Best Property Services (N.I.) Ltd | Real estate | 1990 |
| Blacktie Catering Limited | Hospitality | 2019 |
| Bluebird Agencies Limited | Construction | 1997 |
| Bluekite (UK) Limited | Transport & logistics | 1997 |
| Bodega Properties Limited | Real estate | 2004 |
| Boxed Productions Limited | Arts & recreation | 2002 |
| Boyd Enterprises (N.I.) Ltd | Real estate | 1994 |
| Boyds Stores Ltd | Wholesale & retail | 1988 |
| Boyle Bookmakers Limited | Arts & recreation | 2001 |
| Boyle Gaming Ltd | Arts & recreation | 2007 |
| Brian Owens Contracts Ltd | Construction | 2005 |
| Bridgedale Outdoor Limited | | 2000 |
| Bross Morrison's Ltd | Wholesale & retail | 2009 |
| Butterly (NI) Limited | | 2003 |
| C N Joinery and Building Services LLP | | 2005 |
| C. Coyle Limited | Health & social care | 2007 |
| C.A.R.S. of Newry Limited | Wholesale & retail | 2008 |
| C.J. Utilities Ltd | Construction | 2002 |
| Camlough Construction Limited | Construction | 1996 |
| Cams (NI) Limited | Real estate | 2006 |
| Cana Developments Limited | Wholesale & retail | 2004 |
| Cardona Limited | Manufacturing | 1994 |
| Carnesure Farms Limited | Agriculture & fishing | 1997 |
| Carnview Construction Limited | Construction | 2008 |
| Carpets International (UK) Limited | | 1998 |
| Carrigmanus Ltd | Professional & scientific | 1995 |
| Carson Harland Limited | Professional & scientific | 2006 |
| Cash Flow Services Ltd | | 2001 |
| Casino Palace Ltd | Arts & recreation | 2004 |
| Castit Limited | | 2001 |
| Central Garages Service Station Limited | Extraterritorial | 2000 |
| CET Ltd | | 2003 |
| Cherrymount Investment Co., Limited | Real estate | 1960 |
| Chlorination Services Limited | Professional & scientific | 2006 |
| City West Transport Ltd | Transport & logistics | 2003 |
| Clarke Wholesale Limited | Wholesale & retail | 2004 |
| Cleanways Limited | Other services | 1970 |
| Clemhil Holdings Limited | Wholesale & retail | 1981 |
| Clive Heak Engineering Ltd | Manufacturing | 2003 |
| Clonallon Developments Ltd | Real estate | 2001 |
| Coast Data Security Ltd | Information & communication | 2026 |
| Codico Distributors (N.I.) Limited | Administrative & support | 1991 |
| College Filling Station Limited | Wholesale & retail | 1990 |
| Colm Meehan & Co. Ltd. | Construction | 1990 |
| Conleith Fitzsimons Ltd | Construction | 2002 |
| Conserve Limited | | 1997 |
| Copelands Marina Limited | Arts & recreation | 1977 |
| Corrigs Developments Limited | Construction | 2002 |
| Corrywood Apartments (Management) Ltd | Households | 2002 |
| Craftstone 2000 Limited | Manufacturing | 1996 |
| Craig Henderson Opticians Limited | Health & social care | 2002 |
| Creative Gardens (NI) Limited | Wholesale & retail | 2002 |
| Creative Learning College Limited - the | Extraterritorial | 2005 |
| Creevy Rock's Spring Water Co. Ltd | Extraterritorial | 1998 |
| Cregganduff Farm Ltd | Agriculture & fishing | 2006 |
| Crumlin Livestock Mart Ltd | Agriculture & fishing | 1998 |
| Cunningham Auto Repairs Ltd | Wholesale & retail | 2025 |
| Cunningham Homes Ltd | Construction | 2003 |
| D & M Boden Ltd | Construction | 2003 |
| D T M Insurance Brokers Limited | Financial services | 2005 |