| Copwork Commerce LP | | 2017 |
| Coracad Ltd | Professional & scientific | 2018 |
| Coral Environmental Ltd | Professional & scientific | 2010 |
| Coral Storm Limited | Administrative & support | 2017 |
| Coravellion Enterprises Ltd | Professional & scientific | 2023 |
| Corbel Limited | Construction | 2003 |
| Corbet Homes (NI) Limited | Construction | 2020 |
| Corbett Loft Conversions Ltd | Construction | 2026 |
| Corby Biomass Systems Limited | Manufacturing | 2015 |
| Corby Knowe Windfarm Limited | Energy | 2010 |
| Corcra Media Ltd | Manufacturing | 2018 |
| Cordners Group Ltd | Wholesale & retail | 2021 |
| Cordovan Acquisitions II Limited | Financial services | 2025 |
| Cordovan Capital Management Limited | Financial services | 2011 |
| Cordovan Capital Partners II GP LLP | | 2020 |
| Cordovan Capital Partners III GP LLP | | 2024 |
| Cordovan Nominees One Ltd | Financial services | 2015 |
| Core 17 Movement Ltd | Health & social care | 2026 |
| Core Compliance and Advisory Ltd | Professional & scientific | 2026 |
| Core Connective Ventures Ltd | Professional & scientific | 2023 |
| Core Dance Designs Ltd | Wholesale & retail | 2024 |
| Core Electrical Distributors (N.I.) Ltd | Wholesale & retail | 2011 |
| Core Embroidery Limited | Manufacturing | 2025 |
| Core Leadership Ltd | Administrative & support | 2015 |
| Core Physiotherapy Limited | Health & social care | 2010 |
| Core Respite Services Ltd. | Other services | 2015 |
| Core Systems Group Limited | Information & communication | 2013 |
| Corela Recruitment Ltd | Administrative & support | 2021 |
| Corgary Ltd | Information & communication | 2016 |
| Corick Facilities Management Limited | Hospitality | 2003 |
| Corin Recruitment Limited | Administrative & support | 2014 |
| Corinne Hitching Ltd | Information & communication | 2015 |
| Coris Creative Company Limited | Wholesale & retail | 2025 |
| Corish Film & Video Productions Limited | Information & communication | 2012 |
| Coritas Limited | Information & communication | 2002 |
| Corla Computing Limited | Information & communication | 2013 |
| Corlacky Energy Limited | Energy | 2020 |
| Corn Bell Ltd | Wholesale & retail | 2025 |
| Cornavarrow Windfarm Ltd | Energy | 2005 |
| Cornelius Study Ltd | Information & communication | 2024 |
| Corner Fast Food Ltd | Hospitality | 2025 |
| Cornerstone Belfast Limited | Other services | 2022 |
| Cornerstone Veterinary Clinic Ltd | Professional & scientific | 2015 |
| Cornett Design Associates Limited | Professional & scientific | 2010 |
| Cornfield Trading Limited | Wholesale & retail | 2008 |
| Cornhill Communications Ltd | Professional & scientific | 2015 |
| Cornicle Mouldings Limited | Construction | 2025 |
| Cornish Apple Ltd | Wholesale & retail | 2025 |
| Cornmarket Insurance Services Limited | Financial services | 1995 |
| Cornorrstone Ltd | Wholesale & retail | 2012 |
| Coronea Estates Limited | Wholesale & retail | 2022 |
| Corporate AV Hire Limited | Professional & scientific | 2012 |
| Corporate Catering Management Limited | Hospitality | 1992 |
| Corporation Street Holdings Limited | Real estate | 2023 |
| Corporation Street Properties Limited | Real estate | 2023 |
| Corr Contracts Ltd | Construction | 2011 |
| Corran Management Company Limited | Real estate | 1989 |
| Corraquil Country Cottages Limited | Households | 2022 |
| Corrective Chiropractic Limited | Health & social care | 2014 |
| Corrib Contracts Limited | Construction | 2022 |
| Corrick Limited | Financial services | 2019 |
| Corrigan Property Investments Ltd | Real estate | 2019 |
| Corrigan Psychology Services Ltd | Health & social care | 2023 |
| Corrinare Wind Limited | Energy | 2016 |
| Corry Car Company Limited | Wholesale & retail | 2012 |
| Corry Classics Ltd | Wholesale & retail | 2015 |
| Corry Utilities Limited | Construction | 2015 |
| Corvla Ltd | Real estate | 2017 |
| Corvus Recruitment Ltd | Administrative & support | 2011 |
| Corwood Homes (UK) Limited | Construction | 2020 |
| Cosa Eshop Limited | Wholesale & retail | 2025 |
| Cosgrove Consulting Limited | Administrative & support | 2011 |
| Coshone Limited | | 1997 |
| Cosmar Property Ltd | Real estate | 2021 |
| Cosmetic Car Repair Ltd | Manufacturing | 2021 |
| Cosmetics Compliance UK EU Limited | Manufacturing | 2021 |
| Cosmic Kids Play Ltd | Arts & recreation | 2018 |
| Cosmic Symbol Aerospace Ltd | Manufacturing | 2018 |
| Cosmicare Limited | Information & communication | 2019 |
| Costa PAY Limited | Administrative & support | 2024 |
| Coti Limited | Financial services | 2022 |
| Cottages in Ireland Limited | Extraterritorial | 2005 |
| Cottars Chase NI Management Co Ltd | Households | 2023 |
| Cotton Print Factory Shop Limited - the | Wholesale & retail | 1982 |
| Cottonmount Arms Ltd | Hospitality | 2024 |
| Cottonmount Properties Ltd | Real estate | 2024 |
| Coulter Engineering Limited | Professional & scientific | 2020 |
| Coulter Holdings Portadown Limited | Construction | 2015 |
| Coulter Transport Ltd | Transport & logistics | 2015 |
| Counselling ALL Nations Services (Cans) | Other services | 2021 |
| Countesswells Development (NO.1) Limited | Construction | 2013 |
| Countesswells Development (NO.2) Limited | Construction | 2013 |
| Countrywide Contracting Limited | Manufacturing | 2013 |
| County Investments Ltd | Real estate | 2020 |
| County Tyrone Chippers Limited | Hospitality | 2026 |
| Coup D'Etat Films Limited | Information & communication | 2022 |
| Courtesy Cabs (Belfast) Ltd | Transport & logistics | 2021 |
| Courtesy Cabs Limited | Transport & logistics | 2019 |
| Courtney & Nelson Investments Limited | Professional & scientific | 2003 |
| Courtney & Nelson Limited | Wholesale & retail | 2003 |