| Copper Beech Veterinary Surgery Limited | Professional & scientific | 2022 |
| Copper Investment Trading Limited | Professional & scientific | 2016 |
| Copper Key Solutions Limited | Information & communication | 2013 |
| Copper Metallised Film Ltd | Professional & scientific | 2023 |
| Copthorne Consultancy Ltd | Real estate | 2018 |
| Copy OR DIE Ltd | Professional & scientific | 2023 |
| Copycad Ltd | Professional & scientific | 2016 |
| Copyright and Trademark Protection Ltd | Arts & recreation | 2025 |
| COR24 Ltd | Education | 2023 |
| Cora Car Limited | Wholesale & retail | 2005 |
| Cora Car Recovery and Storage Limited | Wholesale & retail | 2013 |
| Coral Jput Limited | Professional & scientific | 2008 |
| Coral Residences Limited | Real estate | 2026 |
| Coralcoveaquatics Ltd | Wholesale & retail | 2025 |
| Corbett & Co Accountants Limited | Professional & scientific | 2012 |
| Corbett Properties Limited | Extraterritorial | 2020 |
| Corbid Property Investments Limited | Real estate | 2020 |
| Corbin Hospitality International Ltd | Administrative & support | 2026 |
| Corbin Hospitality Ltd | Administrative & support | 2025 |
| Core Appraisal Training Ltd | Education | 2025 |
| Core Coffee Liverpool Ltd | Hospitality | 2023 |
| Core Coffee Ready to EAT Ltd | Manufacturing | 2019 |
| Core Euro General Trading Ltd | Wholesale & retail | 2026 |
| Core Guidance CIC | Education | 2024 |
| Core Health Safety and Environmental Solutions Ltd | Professional & scientific | 2011 |
| Core Mechanical & Maintenance Services Limited | Construction | 2023 |
| Core Nutrition, Health and Wellness Limited | Administrative & support | 2019 |
| Coreal Ltd | Real estate | 2019 |
| Corebridge Future Limited | Hospitality | 2022 |
| Coremco Limited | Professional & scientific | 2017 |
| Corerfid Holdings Limited | Financial services | 2016 |
| Corerfid Limited | Wholesale & retail | 2007 |
| Corestone Property Limited | Construction | 2025 |
| Corey Ventures Ltd | Wholesale & retail | 2024 |
| Corga Consulting Ltd | Professional & scientific | 2018 |
| Corkery Smith Ltd | Construction | 2025 |
| Corkill Medical Services Ltd | Administrative & support | 2016 |
| Cormo Film Ltd | Information & communication | 2021 |
| Cornelius Inspection Services Ltd | Construction | 2021 |
| Cornell Consultancy Ltd | Information & communication | 2016 |
| Cornerstone (Northwest) Limited | Wholesale & retail | 2004 |
| Cornerstone Care (NW) Limited | Health & social care | 2025 |
| Cornerstone Cleaning Ltd | Extraterritorial | 2024 |
| Cornerstone Contracts Ltd. | Construction | 2003 |
| Cornerstone Damp Solutions Ltd | Construction | 2019 |
| Cornerstone Partners Limited | Professional & scientific | 2011 |
| Cornerstone Real Properties Ltd | Real estate | 2024 |
| Cornhill Works Ltd | Households | 2025 |
| Cornitrans Ltd | Transport & logistics | 2022 |
| Cornwallis Court Management Company Limited | Households | 2003 |
| Coronation Minimart Ltd | Wholesale & retail | 2025 |
| Coronation Properties Limited | Real estate | 1989 |
| Coronation Road Valeting Ltd | Administrative & support | 2026 |
| Coronet Topco Limited | Professional & scientific | 2015 |
| Corpalco Limited | Manufacturing | 2018 |
| Corpast Limited | Real estate | 2025 |
| Corperate Domestic Ltd | Administrative & support | 2023 |
| Corporate Landscape Management Limited | Administrative & support | 2014 |
| Corporate Lettin Ltd | Hospitality | 2018 |
| Corporate Mobile Connections Limited | Information & communication | 2006 |
| Corporate Travel Connections Limited | Professional & scientific | 2015 |
| Corporate Wellness Limited | Health & social care | 2021 |
| Corrib Leisure (UK) Limited | Hospitality | 1993 |
| Corrie Closes Ltd | Administrative & support | 2026 |
| Corrine Lloyd Learning C.I.C. | Education | 2018 |
| Corrstruction Limited | Construction | 2025 |
| Corsa Construction Ltd | Construction | 2017 |
| Corsa Digital Ltd | Information & communication | 2024 |
| Corta International Ltd | Transport & logistics | 2022 |
| Corwen Properties Ltd | Real estate | 2025 |
| Cosan Consulting Limited | Financial services | 2014 |
| Cosanta Care Consultancy Ltd | Education | 2022 |
| Cosgrove (North West) Limited | Administrative & support | 2011 |
| Cosgrove's IFC Limited | Other services | 2019 |
| Cosi Capital Ltd | Real estate | 2023 |
| Cosi Developments Limited | Real estate | 2017 |
| Cosmeceutical Brands (UK) Limited | Wholesale & retail | 2021 |
| Cosmetic HQ Ltd | Wholesale & retail | 2025 |
| Cosmetic Surgery at the Royal Liver Building Ltd | Health & social care | 2022 |
| Cosmetic Teeth Whitening NW Ltd | Other services | 2025 |
| Cosmetology Clinic & Training Ltd | Other services | 2020 |
| Cosmetology Clinic Limited | Other services | 2023 |
| Cosmetology With Elegance Ltd | Manufacturing | 2023 |
| Cosmic Builds Ltd | Construction | 2023 |
| Cosmic Gateways Ltd | Other services | 2022 |
| Cosmic Monocle Limited | Information & communication | 2017 |
| Cosmo L&T Ltd | Education | 2021 |
| Cosmo's Park Cafe CIC | Hospitality | 2024 |
| Cosmonaut Studios Limited | Professional & scientific | 2015 |
| Cosmopolitan Drinks Limited | Wholesale & retail | 2010 |
| Cosmora Ltd | Wholesale & retail | 2026 |
| Cosmos Chippy Ltd | Hospitality | 2025 |
| Cosmos Holdings NW Ltd | Financial services | 2023 |
| Cosmozo Ltd | Professional & scientific | 2025 |
| Cospicua Commercials Limited | Households | 2025 |
| Cossham Homes Limited | Construction | 2025 |
| Cossiga (Europe) Limited | Wholesale & retail | 2015 |
| Cost Saver Ridgewood Ltd | Wholesale & retail | 2019 |
| Costa's Tyres Wholesale Limited | Wholesale & retail | 2015 |
| Costech Ltd | Extraterritorial | 2020 |