| Copper Shows Ltd | Arts & recreation | 2025 |
| Copper Studios (Nottingham) Ltd | Arts & recreation | 2020 |
| Copper Swan Limited | Professional & scientific | 2018 |
| Copper Tax Limited | Professional & scientific | 2019 |
| Copper Tulip Ltd | Professional & scientific | 2012 |
| Copperfields Hucknall Limited | Other services | 2026 |
| Copperhaus Limited | Wholesale & retail | 2022 |
| Coppersolar Limited | Construction | 2022 |
| Coppice Hanger Ltd | Construction | 2021 |
| Coppice Holdings Group Limited | Administrative & support | 1997 |
| Coppice Holdings Group Topco Limited | Financial services | 2019 |
| Coppice Side (Swadlincote) Limited | Construction | 2021 |
| Copse Construction Ltd | Construction | 2024 |
| Copse Homes Limited | Real estate | 2025 |
| Copt Hill Energy Ltd | Real estate | 2022 |
| Copthorne Keep Management Company Limited | Households | 2019 |
| Coptoak Limited | Professional & scientific | 1985 |
| COR Rentals Limited | Real estate | 2023 |
| Coral Beauty Ltd | Wholesale & retail | 2021 |
| Coral Electrical Limited | Construction | 2018 |
| Coral Lewis Animal Physiotherapy Ltd | Professional & scientific | 2022 |
| Coral Nest Limited | Real estate | 2026 |
| Coralie Services Limited | Health & social care | 2022 |
| Coralshell Limited | Extraterritorial | 2003 |
| Coram DEO Homes Ltd | Construction | 2022 |
| Corax Group Limited | Construction | 2020 |
| Corbin Shaw Ltd | Manufacturing | 2022 |
| Corden & Townsend Limited | Construction | 2015 |
| Corden Group Limited | Extraterritorial | 2006 |
| Corden Hardware Company Limited | Wholesale & retail | 1971 |
| Corden Manufacturing Limited | Manufacturing | 2004 |
| Cordial Care Services Limited | Administrative & support | 2022 |
| Cordline Services Limited | Professional & scientific | 2001 |
| Cordum Transport Limited | Transport & logistics | 2016 |
| Cordyceps Management Limited | Administrative & support | 2023 |
| Core + KIN Ltd | Arts & recreation | 2026 |
| Core Electrical Contractors Ltd | Construction | 2016 |
| Core Ledger Accountancy Ltd | Professional & scientific | 2026 |
| Core Mechanical Limited | Construction | 2022 |
| Core Nexus Ltd | Professional & scientific | 2026 |
| Core Quantity Surveying Ltd | Professional & scientific | 2018 |
| Core Support Services Ltd | Professional & scientific | 2012 |
| Core Therapy Limited | Health & social care | 2019 |
| Core Transport Training Ltd | Education | 2016 |
| Core Workwear Ltd | Wholesale & retail | 2018 |
| Corecare West Limited | Health & social care | 2026 |
| Coremedic DX Limited | Health & social care | 2025 |
| Coreser Limited | Information & communication | 2025 |
| Corestunts Ltd | Wholesale & retail | 2026 |
| Coretech Studios Ltd | Information & communication | 2026 |
| Coreten Limited | Construction | 2021 |
| Coretruetech Ltd | Information & communication | 2025 |
| Corevison Consulting Ltd | Education | 2024 |
| Coriel Limited | Information & communication | 2008 |
| Corinth Transport Ltd | Transport & logistics | 2018 |
| Corinthian Architectural Ltd | Professional & scientific | 2020 |
| Coriolis Limited | Professional & scientific | 1996 |
| Corktree Industries Limited | Wholesale & retail | 2020 |
| Corkymandle Limited | Wholesale & retail | 2016 |
| Corkys Heating Services Limited | Construction | 2017 |
| Corkzbar Ltd | Hospitality | 2024 |
| Cornell Solicitors Limited | Professional & scientific | 2025 |
| Cornerstone Construction Services Ltd | Real estate | 2015 |
| Cornerstone Evangelical Church | Other services | 2009 |
| Cornerstone Fellowship UK Ltd | Other services | 2025 |
| Cornerstone Jerk HUT Ltd | Hospitality | 2019 |
| Cornerstone Legacy Planning & Probate Limited | Professional & scientific | 2026 |
| Cornhill Greenwood Ltd | Real estate | 2022 |
| Cornish Engineering,Limited | Manufacturing | 1944 |
| Cornmill Homes Management Ltd | Real estate | 2019 |
| Cornsea Limited | Real estate | 1983 |
| Cornwall Waverunner Safaris Limited | Arts & recreation | 2013 |
| Corona Group of Companies Limited | Financial services | 2025 |
| Coronato Ices Limited | Manufacturing | 2003 |
| Corotec Limited | Extraterritorial | 2000 |
| Corporate Balance Ltd | Professional & scientific | 2009 |
| Corporate Design Services Limited | Professional & scientific | 2010 |
| Corporate Leisure and Events Limited | Financial services | 2025 |
| Corporate Money Matters Ltd | Professional & scientific | 1989 |
| Corporate NET Solutions Limited | Information & communication | 2024 |
| Corporate Project Finance Limited | Professional & scientific | 1998 |
| Corporate Sourcing Solutions Ltd | Professional & scientific | 2009 |
| Corporate Wealth Limited | Financial services | 2013 |
| CORPORATE365 Limited | Health & social care | 2018 |
| Corptex Ltd | Wholesale & retail | 2019 |
| Correct Hearing Limited | Wholesale & retail | 2008 |
| Correct Service Limited | Other services | 2002 |
| Cors Plumbing & Heating Limited | Construction | 2019 |
| Corsa Cultura Ltd | Wholesale & retail | 2024 |
| Corsa Ricambi LLP | | 2006 |
| Corsair Properties Limited | Households | 2025 |
| Corstorphine & Wright (London) Ltd | Professional & scientific | 2002 |
| Cortec Consultants Limited | Information & communication | 2013 |
| Cortec Engineering Limited | Professional & scientific | 2016 |
| Cortex Bidco Limited | Financial services | 2023 |
| Cortex Topco Limited | Financial services | 2023 |
| Cortra Limited | Professional & scientific | 2013 |
| Cortrex Group Ltd | Construction | 2026 |
| Corvette Crown (Nottingham) Holdings Limited | Construction | 2021 |
| Corvette Nottingham Limited | Financial services | 2021 |