| Calderglen Consulting Ltd | Professional & scientific | 2018 |
| Caldhame Farms Limited | Agriculture & fishing | 2018 |
| Caldhame Holdings Limited | Financial services | 2026 |
| Caldhame Lodge Limited | Hospitality | 2020 |
| Caldwell Consulting Engineers Limited | Professional & scientific | 2004 |
| Caldwell Financial Ltd | Professional & scientific | 2025 |
| Caldwell Ritchie Berry Limited | Professional & scientific | 2017 |
| Cali Tanning Ltd | Other services | 2024 |
| Callacab Dundonald Limited | Transport & logistics | 2022 |
| Callender Street Nominees 1 Limited | Professional & scientific | 2017 |
| Callender Street Nominees Limited | Professional & scientific | 1998 |
| Callender Street Properties (NO..5) LP | | 2003 |
| Callender Street Properties (NO.11) LP | | 2003 |
| Callender Street Properties (NO.11) Lphip N. Ireland LP | | 2004 |
| Callender Street Properties (NO.13) LP | | 2004 |
| Callender Street Trustees Limited | Administrative & support | 2001 |
| Callow Event Management Limited | Administrative & support | 2014 |
| Callum Thomson Ltd | Wholesale & retail | 2025 |
| Calona Ltd | Construction | 2019 |
| Calor GAS Northern Ireland Limited | Wholesale & retail | 1971 |
| Cals Cafe Ltd | Arts & recreation | 2025 |
| Calsam Holdings Limited | Financial services | 2024 |
| Calu Holdings Limited | Professional & scientific | 2025 |
| Calvert Capital Holdings NI Ltd | Professional & scientific | 2026 |
| Calzach Limited | Energy | 2012 |
| CAM Amusement Limited | Arts & recreation | 2009 |
| CAM Consultants Ltd | Professional & scientific | 2013 |
| CAM Football Ltd | Other services | 2025 |
| Caman Equipment Ltd | Manufacturing | 2009 |
| Camana Consulting Limited | Construction | 2013 |
| Camberwell Management Company Limited | Households | 2010 |
| Cambosa Ltd | Financial services | 2026 |
| Cambridge Essentials Limited | Education | 2021 |
| Camcg Consulting Limited | Administrative & support | 2017 |
| Camera House Ltd | Hospitality | 2019 |
| Camera Plus Limited | Wholesale & retail | 2014 |
| Cameron Landscapes Limited | Administrative & support | 1972 |
| Camla Holdings Limited | Financial services | 2025 |
| Camlough Wind Limited | Energy | 2012 |
| Camodic Co. Ltd | Wholesale & retail | 2025 |
| Camp Sonshine Portugal Ltd | Other services | 2016 |
| Camp Yolo Ltd | Education | 2017 |
| Campbell Catering (N.I.) Limited | Hospitality | 1995 |
| Campbell Custom Engineering Ltd | Manufacturing | 2022 |
| Campbell Design & Build Contracts Ltd | Construction | 2025 |
| Campbell Developments Holdings Limited | Construction | 2024 |
| Campbell Hearing Aids Limited | Wholesale & retail | 2003 |
| Campbell Mccrudden Limited | Professional & scientific | 2025 |
| Campbell Medical Limited | Wholesale & retail | 2023 |
| Campbell Medicolegal Limited | Health & social care | 2025 |
| Campbell NI Developments Limited | Financial services | 2024 |
| Campbell NI Properties Limited | Real estate | 2024 |
| Campbell Pharmaceuticals Limited | Wholesale & retail | 2021 |
| Campbell Properties Holdings Limited | Financial services | 2024 |
| Campbells Dispensary Limited | Extraterritorial | 1998 |
| Camperdown Developments Limited | Real estate | 2007 |
| Camphill Communities Trust (NI) | Health & social care | 1954 |
| Campsie Management Company Limited | Households | 2004 |
| Campsie Three Limited | Construction | 2022 |
| Campstead Ltd | Information & communication | 2006 |
| Camroc Ltd | Real estate | 2025 |
| Cams Accounting & Management Initiative (N.I) Ltd | Professional & scientific | 2020 |
| Camsafe Ltd | Professional & scientific | 2019 |
| Camseng International Foods Limited | Wholesale & retail | 2013 |
| Camton Ltd | Construction | 2025 |
| Caméire Ltd | Information & communication | 2022 |
| CAN YOU Caddie Ltd | Information & communication | 2025 |
| Cancakes Belfast Ltd | Hospitality | 2026 |
| Cancer Focus Northern Ireland | Health & social care | 2004 |
| Cancer Lifeline | Health & social care | 2005 |
| Cancer Research Office Ltd | Administrative & support | 2022 |
| Candela Enterprises Limited | Financial services | 2009 |
| Canderblinks Film & Music Limited | Information & communication | 2006 |
| Candle Belle Limited | Manufacturing | 2012 |
| Candlelit Love Ltd | Wholesale & retail | 2024 |
| Candor Security Limited | Information & communication | 2023 |
| Candy Nails Ltd | Other services | 2021 |
| Candy World 2 Ltd | Wholesale & retail | 2025 |
| Cane Resolutions Limited | Construction | 2013 |
| Canjad Properties Ltd | Real estate | 2024 |
| Cannes Developments Ltd | Real estate | 2025 |
| Canningmillarsales Ltd | Real estate | 2022 |
| Canofield Premium Brands (UK) Limited | Wholesale & retail | 2022 |
| Canofield Sales & Distribution Limited | Wholesale & retail | 2022 |
| Canopy & Bloom Ltd | Professional & scientific | 2025 |
| Cantab Corporate Finance Limited | Professional & scientific | 2015 |
| Cantaz Services Ltd | Information & communication | 2017 |
| Canteen Belfast Ltd | Hospitality | 2015 |
| Canterdell Management Limited | Households | 2004 |
| Cantua Limited | Professional & scientific | 1995 |
| Canvas Southside Ltd | Arts & recreation | 2025 |
| Canvassr Limited | Wholesale & retail | 2025 |
| Canwear Limited | Manufacturing | 2020 |
| CAO XUE MEI Limited | Wholesale & retail | 2024 |
| Caoldrum Limited | Real estate | 2014 |
| Caora Investments Limited | Construction | 2022 |
| Capaxo Limited | Information & communication | 2012 |
| Capelli(N I ) Limited | Other services | 2015 |
| Capital Autos Car Wash Ltd | Wholesale & retail | 2025 |
| Capital Fire & Security Systems Ltd | Administrative & support | 2015 |