| 10YARDS Limited | Professional & scientific | 2024 |
| 5 Mile Straight Limited | Hospitality | 2014 |
| A.J. Armstrong & Sons Ltd | Manufacturing | 2011 |
| Aaron Connell Farm Services Ltd | Wholesale & retail | 2022 |
| Advanced Cash Control Systems Limited | Administrative & support | 2011 |
| AEL Consult Ltd | Professional & scientific | 2022 |
| AEM Industries Ltd | Professional & scientific | 2022 |
| Agrihand Ltd | Professional & scientific | 2021 |
| Alternative Sports Ltd | Administrative & support | 2021 |
| Altkeeran Limited | Agriculture & fishing | 2016 |
| Alugatesireland Limited | Professional & scientific | 2023 |
| AMC Beauty Ltd | Other services | 2024 |
| AMC Training Academy Ltd | Other services | 2025 |
| AMD (N.I.) Limited | Real estate | 2019 |
| AME Electrical Smart Homes Limited | Construction | 2023 |
| AMG Contracts Ltd | Construction | 2015 |
| AMG I&R Ltd | Construction | 2024 |
| AMG Infrastructure Ltd | Construction | 2024 |
| AMG Renewables Ltd | Construction | 2024 |
| AMG Traffic Management Ltd | Public administration | 2024 |
| AN Carn Limited | Wholesale & retail | 2006 |
| AN Coire | Arts & recreation | 2013 |
| AN Croí Ltd | Other services | 2019 |
| Analyzed (NI) Ltd | Professional & scientific | 2023 |
| AR Nadeem Ltd | Hospitality | 2025 |
| Arbor Investments Limited | Real estate | 1993 |
| Arca Heavy Engineering Ltd | Water & waste | 2018 |
| Ardmore Stone Company Ltd | Manufacturing | 2016 |
| Armstrong Hire Ltd | Administrative & support | 2024 |
| B & F Group Holdings Ltd | Financial services | 2024 |
| B & F Properties Limited | Real estate | 2018 |
| B J Kelso Limited | Agriculture & fishing | 2012 |
| B Young Properties Limited | Real estate | 2017 |
| B-P OLB Property Ltd | Construction | 2021 |
| Ballinderry Bridge Development Limited | Construction | 2018 |
| Ballycraig Joinery Contracts Ltd | Construction | 2019 |
| Barney's Ruins Ltd | Hospitality | 2022 |
| Beaver 1959 Limited | Extraterritorial | 2013 |
| Bizsales Business Brokers Limited | Real estate | 2006 |
| Blindr Box Ltd | Transport & logistics | 2026 |
| Brackagh Developments Ltd | Construction | 2022 |
| Brackaghreilly and District Community Association Limited | Other services | 2002 |
| Bracken Windows & Doors Ltd | Manufacturing | 2015 |
| BRM Retail Ltd | Wholesale & retail | 2024 |
| BSG Civil Engineering Limited | Construction | 1987 |
| BSG Holdco Ltd | Financial services | 2019 |
| Bsg-Agw Group Ltd | Construction | 2020 |
| Bsg-Phace Group Ltd | Construction | 2020 |
| Bteach Ltd | Real estate | 2026 |
| Building Systems (NI) Limited | Construction | 2014 |
| Burger Republic (N.I.) Botanic Limited | Hospitality | 2017 |
| Burger Republic Callender Limited | Hospitality | 2018 |
| Burns & Co Maghera Ltd | Real estate | 2011 |
| BWW Water NI Ltd | Construction | 2009 |
| C&R Property Ltd | Real estate | 2026 |
| C.M Software Solutions Ltd | Information & communication | 2018 |
| Cadler Cadler Ltd | Wholesale & retail | 2024 |
| Cappell Consulting Limited | Professional & scientific | 2016 |
| Captains Hill Farm Ltd | Agriculture & fishing | 2016 |
| Carhill Contracts Ltd | Construction | 2015 |
| Carhill Interiors Ltd | Wholesale & retail | 2014 |
| Carmar Ltd | Financial services | 2024 |
| Carn Civil Solutions Ltd | Construction | 2023 |
| Carn Construction Services Ltd | Construction | 2021 |
| Carn Media | Education | 2005 |
| Carntech Ltd | Information & communication | 2023 |
| Carntogher Cabins Ltd | Arts & recreation | 2018 |
| Carntogher Community Association | Arts & recreation | 1998 |
| Carnview Consultancy Limited | Professional & scientific | 2020 |
| Carrowmenagh Surveying Ltd | Administrative & support | 2026 |
| Carta Education and Leadership Consultancy Limited | Professional & scientific | 2022 |
| CB Engineering (Maghera) Ltd | Manufacturing | 2023 |
| CDC Sales Ltd | Wholesale & retail | 2017 |
| Cenako Limited | Mining & quarrying | 2020 |
| Chambers Coaches Limited | Transport & logistics | 2013 |
| Civco Holdings Ltd | Financial services | 2024 |
| Civco Ltd | Construction | 2014 |
| CL Catering @ Drenagh Ltd | Hospitality | 2015 |
| CL Catering Properties Ltd | Real estate | 2022 |
| Claremount (Maghera) Limited | Professional & scientific | 2015 |
| Clarmov Ltd | Arts & recreation | 2010 |
| Cleansimple (STR) Limited | Administrative & support | 2024 |
| Clear Dental Care Ltd | Health & social care | 2011 |
| Cloneen Brickwork Ltd. | Construction | 2013 |
| Cloverhill Fuels Limited | Wholesale & retail | 2005 |
| Cloverhill Hatcheries Limited | Agriculture & fishing | 2014 |
| Cloverhill Properties Limited | Financial services | 2017 |
| CMG Contract Services Limited | Administrative & support | 2023 |
| Complete Electrical Contract Ltd | Construction | 2023 |
| Concrete and Quarry Services Ltd | Manufacturing | 2025 |
| Conecks Limited | Professional & scientific | 2023 |
| Connolly Consultancy Limited | Manufacturing | 2022 |
| Connri Sports & Leisure Ltd | Administrative & support | 2025 |
| Coolnaslee Homes Limited | Construction | 2019 |
| Coolsaragh Limited | Real estate | 2022 |
| Cormac Contracts Ltd | Construction | 2026 |
| Coventry Management Co Ltd | Extraterritorial | 2004 |
| CR Maintenance Solutions Ltd | Construction | 2022 |
| Craftec Ltd | Manufacturing | 2024 |
| Craigmore & District Community Association | Health & social care | 2012 |