| A & J Property Trading | Real estate | 2021 |
| Adam Pearson Ltd | Wholesale & retail | 2024 |
| ADL Building & Civil Engineering Limited | Construction | 2018 |
| Adora Fashion Ltd | Wholesale & retail | 2025 |
| Aghyaran Development Association CIC | Health & social care | 2011 |
| Allparts NI Tractor Plant & Agri Spares Ltd | Wholesale & retail | 2015 |
| Almac Contracts Limited | Construction | 2015 |
| Altmor Limited | Agriculture & fishing | 2004 |
| Anglers Inn Ltd | Hospitality | 2024 |
| AO Autos Ltd | Wholesale & retail | 2017 |
| Apple Blossom Consulting Ltd | Construction | 2024 |
| Arco Sourcing Ltd | Wholesale & retail | 2023 |
| Ardbarren Construction and Civils Ltd | Construction | 2021 |
| Ardmore Dairy Ltd | Agriculture & fishing | 2025 |
| Arkinson Transport Ltd | Transport & logistics | 2026 |
| Arolco (Ireland) Limited | Manufacturing | 1992 |
| Arvagh Ltd | Wholesale & retail | 2024 |
| AS Sales Ltd | Wholesale & retail | 2017 |
| Autolink Motors Ltd | Wholesale & retail | 2021 |
| Ballyfolliard Stoneware Ltd | Manufacturing | 2017 |
| BGE Enterprises Limited | Construction | 2021 |
| BJM Plant & Commercials Ltd | Wholesale & retail | 2021 |
| BK Construction (Castlederg) Ltd | Construction | 2021 |
| Blane Steel Services Limited | Construction | 2003 |
| BN Property Investments Ltd | Real estate | 2016 |
| Bradley Branding Ltd | Wholesale & retail | 2025 |
| Brassneck Saints Ltd | Arts & recreation | 2020 |
| Braton Construction Limited | Construction | 2010 |
| Bridgehill Education & Training Ltd | Education | 2023 |
| Brook Plant Hire Ltd | Administrative & support | 2020 |
| Burke & SON Construction Ltd | Construction | 2022 |
| C & R Hamilton Limited | Construction | 2016 |
| C and T K Farm Limited | Agriculture & fishing | 2011 |
| C O'Kane and SON Plant Hire Ltd | Construction | 2026 |
| C. G. Safety Solutions Limited | Construction | 2022 |
| Caldwell Steel Ltd | Manufacturing | 2012 |
| Calida Construction Ltd | Construction | 2016 |
| Cashel Contracts and Plant Hire Limited | Construction | 2017 |
| Castle Glass Limited | Manufacturing | 2003 |
| Castlederg Building Supplies Ltd. | Wholesale & retail | 2011 |
| Castlederg Christian Fellowship | Other services | 2022 |
| Castlederg Developments Ltd | Construction | 2018 |
| Castlegore Car Sales Ltd | Wholesale & retail | 2020 |
| CB Livestock Transport Limited | Transport & logistics | 2024 |
| CE Cars Ltd | Wholesale & retail | 2024 |
| Ceini Limited | Professional & scientific | 2014 |
| CK Prizes Ltd | Arts & recreation | 2025 |
| Ckmr Contracts Ltd | Construction | 2014 |
| Clares Hot Chair Limited | Other services | 2016 |
| Clarke Dairies Ltd | Agriculture & fishing | 2011 |
| Cloon Agri & Plant Ltd | Administrative & support | 2025 |
| Cloon Equestrian & Livery Ltd | Agriculture & fishing | 2025 |
| Cloon Farm Ltd | Agriculture & fishing | 2025 |
| Cloon Solutions Ltd | Manufacturing | 2025 |
| Commercial King's Ltd | Wholesale & retail | 2025 |
| Concrush Plant Ltd | Manufacturing | 2022 |
| Conor Browne Foundation | Other services | 2025 |
| Coolnaherin Contracts Ltd | Administrative & support | 2026 |
| Corrs Construction Ltd | Construction | 2025 |
| Corry's Chemists Ltd | Wholesale & retail | 2008 |
| Crawford MC Callion Ltd | Construction | 2018 |
| Creative Arts & Social Team C.I.C. | Arts & recreation | 2018 |
| Crivens (UK) Ltd | Real estate | 2015 |
| Custom Construction Contracts Limited | Construction | 2019 |
| Custom Plant Hire and Sales Limited | Construction | 2019 |
| D Roulston & Sons (NI) Ltd | Construction | 2023 |
| D&M Events Ltd | Arts & recreation | 2021 |
| Dan's Barbers Group Ltd | Other services | 2026 |
| DC Haulage Cross Channel Ltd | Transport & logistics | 2022 |
| Dcgr Ltd | Hospitality | 2013 |
| DEE Contracts Ltd | Construction | 2020 |
| Deirge Brewery Ltd | Manufacturing | 2023 |
| Delphland Investments Limited | Financial services | 2025 |
| Derant Investments Limited | Professional & scientific | 2014 |
| Derg Castle Trading Ltd | Real estate | 2013 |
| Derg Commercials Limited | Administrative & support | 2006 |
| Derg Valley Hospitality Association | Arts & recreation | 2015 |
| Derg Valley Properties Limited | Real estate | 2003 |
| Derg Valley Rentals Ltd | Real estate | 2024 |
| DL Livestock & Haulage Ltd | Agriculture & fishing | 2024 |
| DMD Steel Erecting Ltd | Construction | 2025 |
| Donnell & Ellis Engineering Limited | Construction | 2014 |
| DTK Contracts Ltd | Construction | 2018 |
| Dunraven Retail Limited | Wholesale & retail | 2016 |
| Edymore Contracts Ltd | Professional & scientific | 2024 |
| Elite Labour and Groundworks Limited | Construction | 2012 |
| Ellis Engineering Services Limited | Manufacturing | 1996 |
| Encon-Ni Ltd | Professional & scientific | 2021 |
| Enhance Skin Spa Ltd | Other services | 2024 |
| Erganagh Concrete Limited | Construction | 2019 |
| Erganagh Farm Group Ltd | Agriculture & fishing | 2021 |
| Erganagh Motors Limited | Wholesale & retail | 2024 |
| Erne Recovery Ltd | Wholesale & retail | 2019 |
| Essan Cottage CIC | Education | 2018 |
| Evish Energy Ltd | Energy | 2011 |
| EVO Simulation (NI) Ltd | Arts & recreation | 2016 |
| First Steps Community Group | Real estate | 1998 |
| Flame by the Forge Ltd | Hospitality | 2026 |
| Garvagh & District Community Association | Professional & scientific | 1999 |
| Garvagh INT Limited | Transport & logistics | 2024 |