| 110A Causeway Street Ltd | Households | 2026 |
| 3FORECO Ltd | Professional & scientific | 2023 |
| 41 Mount Management Company Limited | Households | 2024 |
| 6 the Crescent Portstewart Management Company Limited | Extraterritorial | 2015 |
| 61-65 Lockview Road Management Company Limited | Households | 2025 |
| 7 Landsdowne Portrush Management Company Limited | Households | 2021 |
| A.J. Clancy (Investments) Limited | Administrative & support | 1998 |
| Abbeyorc Ltd | Real estate | 2023 |
| Abprop Limited | Construction | 2017 |
| AC Medical Aesthetics Limited | Health & social care | 2023 |
| Academic Fish Ltd | Information & communication | 2020 |
| Actuarial Marketplace Ltd | Administrative & support | 2024 |
| Adrian Margey Artwork Ltd | Arts & recreation | 2014 |
| Advanced Courses Ltd | Education | 2022 |
| Aero-Integrity Ltd | Professional & scientific | 2021 |
| Aird Clachan Cottages Limited | Extraterritorial | 2000 |
| Ajsj Holdings Ltd | Financial services | 2025 |
| Alexandra Apartments (NO1) Limited | Households | 2005 |
| Alexandra Apartments (NO2) Limited | Households | 2005 |
| Alexandra Apartments (NO3) Limited | Households | 2006 |
| Alexandra Apartments (NO4) Limited | Households | 2006 |
| Alexandra Apartments Limited | Households | 2005 |
| Alga Catering Equipment Ltd | Hospitality | 2025 |
| Anem Ltd | Construction | 2021 |
| Aquaholics Dive Centre Limited | Arts & recreation | 2010 |
| Aras Barbershop Ltd | Other services | 2025 |
| Ardbana Services Ltd | Extraterritorial | 2003 |
| Ardevaran Court Management Limited | Households | 2001 |
| Armstrong Gordon & Company Limited | Real estate | 2014 |
| Atlantic Bay (Portstewart) Management Limited | Extraterritorial | 2000 |
| Atlantic Circle Car Park Management Company Limited | Extraterritorial | 2000 |
| Atlantic Cove Portstewart Management (NO.2) Limited | Households | 2002 |
| Atlantic Cove Portstewart Management Company Limited | Extraterritorial | 2002 |
| Atlantic Point Management Company Limited | Households | 2017 |
| Atlantic Rock Properties Limited | Real estate | 2014 |
| Atlantic View Management Company Limited | Extraterritorial | 1997 |
| Axial Workforce Consultancy Ltd | Health & social care | 2022 |
| Ballyclough Road Residents Limited | Extraterritorial | 1990 |
| Ballymacran Limited | Real estate | 2021 |
| Bayhead Apartments Limited | Extraterritorial | 1994 |
| BDP Property Investments Ltd | Construction | 2024 |
| Beechvale Stud Limited | Agriculture & fishing | 2025 |
| Big Telly Theatre Company | Arts & recreation | 1989 |
| Billy Leighton Whiskey Consultancy Limited | Professional & scientific | 2025 |
| BKS Developments Limited | Construction | 2015 |
| Blackhill Enterprises Limited | Construction | 1992 |
| Blackrock Court Management Services Ltd | Extraterritorial | 2002 |
| Blondin Limited | Construction | 2025 |
| Bluesky Retail Ltd | Wholesale & retail | 2026 |
| Boguwaclothing Ltd | Wholesale & retail | 2025 |
| Bonalston Caravans Limited | Hospitality | 1984 |
| Broughshane Road Management Company Ltd | Households | 2006 |
| Burnside (Portstewart) Limited | Extraterritorial | 1999 |
| Burnt Soda Ltd | Professional & scientific | 2026 |
| Bushfoot Cottages Management Limited | Hospitality | 1998 |
| Bushford Services Limited | Extraterritorial | 1991 |
| Bwcni Limited | Manufacturing | 2021 |
| C & C Anchor Bar Complex Ltd | Hospitality | 2021 |
| C & V Retailing Ltd | Wholesale & retail | 2014 |
| C Donnelly N.I. Limited | Other services | 2022 |
| Caherty Services Company Limited | Households | 2010 |
| Cairn Electrical Consulting Ltd | Construction | 2013 |
| Cairnhill Apartments Management Limited | Extraterritorial | 2004 |
| Calm & Connected Babies Ltd | Education | 2026 |
| Calo Scientific Ltd | Manufacturing | 2025 |
| Cappagh More Court Management Limited | Extraterritorial | 2008 |
| Castle Linn Management Limited | Households | 2019 |
| Caulfield Mulvenna Limited | Construction | 2005 |
| Causeway Coast Mini Club Limited | Other services | 2004 |
| Causeway Coast Psychology Ltd | Health & social care | 2023 |
| Causeway Coast Rentals Ltd | Real estate | 2014 |
| Causeway Consulting and Investments Limited | Professional & scientific | 2022 |
| Causeway Lofts Management Ltd | Extraterritorial | 2014 |
| Causeway Sports Academy CIC | Education | 2023 |
| Causeway WOK Ltd | Hospitality | 2026 |
| Cherton Ltd | Real estate | 2025 |
| Claraghmore Wind Ltd | Energy | 2011 |
| Coast Connections Ltd | Financial services | 2022 |
| Coleraine Area Child Contact Centre | Other services | 2005 |
| Collision Autobody Repairs Limited | Wholesale & retail | 2022 |
| Content Kings Media Ltd | Administrative & support | 2019 |
| Contractuary Ltd | Administrative & support | 2009 |
| Convention Services Ltd | Extraterritorial | 2003 |
| Cortachey Ltd | Extraterritorial | 2021 |
| Counties Management Company Limited - the | Households | 2000 |
| Craigland Investments Limited | Real estate | 2006 |
| Cromore Castles Limited | Arts & recreation | 2016 |
| Cromore Cloud Solutions Ltd | Information & communication | 2022 |
| Cromore Halt Inn Ltd | Hospitality | 2014 |
| Cromore Station Management Limited | Extraterritorial | 1997 |
| Dalriada Training Services C.I.C. | Administrative & support | 2016 |
| Dempseys of Portstewart Limited | Wholesale & retail | 1988 |
| Dese Developments Ltd | Construction | 2007 |
| Devmont Limited | Construction | 2016 |
| Djgk Holdings Limited | Real estate | 2020 |
| Drumard Apartments Management Limited | Extraterritorial | 2000 |
| Drumeen Construction Ltd | Construction | 2000 |
| Drumlin Homes Ltd | Real estate | 2026 |
| Duneight Limited | Extraterritorial | 2007 |
| Dunsandel Services Limited | Extraterritorial | 1988 |