| 1ST Alert Alarm Systems Ltd | Administrative & support | 2006 |
| 5 Star Homes Limited | Extraterritorial | 1996 |
| A & E Cattle Limited | Agriculture & fishing | 2008 |
| A Donnelly Flooring Limited | Construction | 2003 |
| A H Fuel Oils Ltd | Wholesale & retail | 1995 |
| A.A. Ballantyne Limited | Professional & scientific | 2004 |
| A5 Stores Ltd | Administrative & support | 2004 |
| AA Precision Limited | Manufacturing | 2004 |
| Ace Fabrications (IE) Ltd | Manufacturing | 2004 |
| Agri Spares Omagh Limited | Wholesale & retail | 2006 |
| Agri-Cycle Services Limited | Wholesale & retail | 2004 |
| Agritech Solutions N.I. Ltd | Agriculture & fishing | 2008 |
| Akon Developments Limited | Professional & scientific | 1994 |
| Alan Irwin Farm Enterprises Ltd | Agriculture & fishing | 2002 |
| Aldebaran Consultants Limited | Professional & scientific | 2002 |
| Alexander Mills Civils Ltd | Construction | 2019 |
| Allingham Transport Limited | Transport & logistics | 1997 |
| Alskea Ltd | Construction | 2006 |
| Altmore Developments Ltd | Construction | 2001 |
| AN Daingean Ltd. | Agriculture & fishing | 1973 |
| Anchorage Contractors Limited | Real estate | 2002 |
| Annaghbeg Limited | Financial services | 2005 |
| AP MC Crory Engineering Limited | Construction | 2006 |
| Apcon (N.I.) Limited | Information & communication | 2008 |
| Armstrong Structural Limited | Construction | 2006 |
| Ashton Agencies Limited | | 1990 |
| Asset Management (NI) Limited | Real estate | 1992 |
| Astec Industries Europe Limited | Manufacturing | 2001 |
| Aureliusit Limited | Information & communication | 2011 |
| Aurivo (NI) Limited | Wholesale & retail | 1998 |
| B & D Properties (Tyrone) Ltd | Construction | 2007 |
| B H Glazing Ltd | Construction | 1990 |
| B&B Construction (Castlederg) Limited | Wholesale & retail | 2002 |
| Bagnall Limited | Mining & quarrying | 2005 |
| Ballee Farms Limited | Real estate | 1996 |
| Ballygawley Area Development Association Limited | Real estate | 1999 |
| Ballymilligan Pharmacy Limited | Professional & scientific | 2007 |
| Ballyrenan Developments Limited | Real estate | 1971 |
| Bancoff Limited | Real estate | 1994 |
| Barrenscourt Properties Ltd | Real estate | 2003 |
| Barrett Wholesale Limited | Wholesale & retail | 1999 |
| Beaverlodge Farms Ltd | Agriculture & fishing | 2008 |
| Beehive Merchants Limited | Wholesale & retail | 2004 |
| Berryhill Construction Limited | Construction | 2006 |
| Birchwood Property Rentals Ltd | Real estate | 2003 |
| Blackoak Properties Limited | Real estate | 2001 |
| BMI Trailers Limited | Manufacturing | 1999 |
| Boran-Mopack Limited | Manufacturing | 2003 |
| Bramblehedge Properties Limited | Real estate | 2007 |
| Brigar Holdings Limited | Real estate | 1974 |
| C & S Construction (Ireland) Ltd | Construction | 2005 |
| C J M Enterprises Limited | Construction | 2006 |
| C&M Licensing Ltd | Manufacturing | 2006 |
| Cabragh Developments Ltd | Construction | 2002 |
| Caledon Estates Company | Agriculture & fishing | 1929 |
| Campbell & Slevin Limited | Construction | 1991 |
| Capemist Gloves Limited | Wholesale & retail | 1983 |
| Capper (Fuels) Limited | Extraterritorial | 1988 |
| Capper Trading Limited | Manufacturing | 1987 |
| Capper Transport Limited | Extraterritorial | 1978 |
| Capri Properties Limited | Real estate | 2004 |
| Castlederg and District Enterprises Company Limited | Real estate | 1989 |
| Castlederg Childcare Services Ltd | Health & social care | 2007 |
| Charles O'Doherty & Sons Limited | Manufacturing | 1953 |
| Chess TDC Limited | Administrative & support | 2002 |
| Chieftain Trailers | Manufacturing | 1999 |
| Churchtown Community Association | Health & social care | 2004 |
| Churchtown Property Management Limited | Real estate | 2006 |
| CK International Limited | Manufacturing | 2002 |
| Clive Hamilton Motors Ltd | Wholesale & retail | 2002 |
| Clogher Valley Agricultural Society Limited-The | Other services | 1987 |
| Clogher Valley Livestock Producers Company Limited | Wholesale & retail | 1954 |
| Col-Mac Limited | Extraterritorial | 2003 |
| Colhoun Scaffolding Services Limited | Manufacturing | 2006 |
| College Court Properties Limited | Real estate | 1998 |
| Colton Contracts Limited | Agriculture & fishing | 2001 |
| Commercial Recordings Ltd | Wholesale & retail | 2005 |
| Conwell Roofing Contracts Limited | Construction | 1991 |
| Cookstown & District Motor Cycle Club (Road Racing) Limited | Arts & recreation | 2002 |
| Cookstown Clothing Co. Limited | Manufacturing | 1976 |
| Cooley Castles Ltd | Arts & recreation | 2006 |
| Coolfinn Properties Limited | Professional & scientific | 2004 |
| Coolmount Management Company Limited | Extraterritorial | 2006 |
| Cooneen Protection Limited | Manufacturing | 2003 |
| Coote's (Builders Merchants) Limited | Wholesale & retail | 1984 |
| Corkhill Lodge Limited | Health & social care | 2002 |
| Corlat Developments Limited | Real estate | 2004 |
| Corrigan Vehicle Rentals Limited | Administrative & support | 1995 |
| Creative Stone and Tile Ltd | Manufacturing | 2006 |
| Crew Pork Processors Limited | Agriculture & fishing | 1997 |
| CRJ Properties Limited | Real estate | 2025 |
| Cromar Properties Limited | Construction | 2001 |
| D & P Contracts Ltd. | | 2001 |
| D & S Potter Ltd | Extraterritorial | 2006 |
| DC Piling Ltd | Construction | 2006 |
| Dealer "Free-Ads" Paper Ltd - the | Extraterritorial | 1998 |
| Derg Valley Care Limited | Health & social care | 1995 |
| Devine Architecture Limited | Professional & scientific | 2007 |
| Devine Construction Limited | Other services | 2007 |
| Devine Group Limited | Financial services | 2007 |