| CMW Drainage Solutions Ltd | Other services | 2023 |
| CMW Property and Machinery Limited | Administrative & support | 1995 |
| CMW Property Topco Limited | Financial services | 2024 |
| Cmwb Holdings Limited | Financial services | 2025 |
| Cmwoutlet Ltd | Wholesale & retail | 2025 |
| CN OIL and GAS Services Limited | Professional & scientific | 2018 |
| Cnbd Ltd | Other services | 2017 |
| CNG Ltd | Administrative & support | 2021 |
| Cnjs Consulting Limited | Administrative & support | 2014 |
| Cnslt Logistics Consulting Ltd | Professional & scientific | 2025 |
| Co-Ordinate (UK) Limited | Professional & scientific | 2006 |
| Co-Ordinate Digital Ltd | Professional & scientific | 2021 |
| Coach Driver Alex Ltd | Transport & logistics | 2025 |
| Coachlines of Warrington Limited | Transport & logistics | 1987 |
| Coast & Canal Ltd | Information & communication | 2025 |
| Coatec Ltd | Professional & scientific | 2022 |
| Coates Project Management Limited | Professional & scientific | 2021 |
| COB Investments Ltd | Real estate | 2018 |
| COB Projects Ltd | Construction | 2017 |
| Coba Business Solutions Ltd | Professional & scientific | 2018 |
| Cobalt 13A Management Limited | Extraterritorial | 2009 |
| Cobalt Business Exchange Limited | Real estate | 2012 |
| Cobalt Business Park Limited | Real estate | 2016 |
| Cobalt CBX LLP | | 2012 |
| Cobalt Contractors Limited | Construction | 2006 |
| Cobalt Data Centres Limited | Construction | 2005 |
| Cobalt Real Estate Limited | Professional & scientific | 2013 |
| Cobalt South Land Limited | Construction | 2014 |
| Cobi Aesthetics Ltd | Other services | 2024 |
| Cobrail Ltd | Administrative & support | 2022 |
| Cocco Engineering Limited | Professional & scientific | 2018 |
| Coco's 85 Limited | Hospitality | 2010 |
| Cocovista Ltd | Administrative & support | 2025 |
| Coda Music Academy Limited | Education | 2025 |
| Code and Create Ltd | Information & communication | 2017 |
| Code Beast Ltd | Administrative & support | 2016 |
| Code Coaching & Development Limited | Other services | 2026 |
| Code IT Labels Limited | Information & communication | 2007 |
| Code Rewind Limited | Information & communication | 2018 |
| Code Word Live Ltd | Wholesale & retail | 2025 |
| Codel Solutions Ltd | Professional & scientific | 2018 |
| Codelattice UK Ltd | Information & communication | 2023 |
| Cody Estates NW Limited | Real estate | 2025 |
| COF Construction Limited | Construction | 2020 |
| COF Solutions Group Limited | Extraterritorial | 2019 |
| COF Solutions Ltd | Financial services | 2020 |
| Coffeeonthego Ltd | Hospitality | 2022 |
| Coffey Consultancy Ltd | Professional & scientific | 2026 |
| Cofie Limited | Professional & scientific | 2001 |
| Cogent Skills Limited | Education | 2014 |
| Cogent Skills Services Ltd | Professional & scientific | 2011 |
| Cogent Skills Training Limited | Public administration | 2007 |
| Cognativ Limited | Information & communication | 2018 |
| Cognibuild Ltd | Information & communication | 2024 |
| Cognizance Software Limited | Information & communication | 2016 |
| Cohens Glass Limited | Professional & scientific | 2016 |
| Cojective Solutions LT Limited | Administrative & support | 2019 |
| Coko Group Limited | Manufacturing | 2020 |
| Colchester Education Limited | Education | 2021 |
| Coldsaver (Selby) Limited | Manufacturing | 1998 |
| Coldsaver Panels Limited | Manufacturing | 2009 |
| Cole Park Consultancy Limited | Other services | 2018 |
| Cole Retail Ltd | Wholesale & retail | 2009 |
| Cole SDR Ltd | Administrative & support | 2023 |
| Coleman and Mcclory Property Ltd | Real estate | 2019 |
| Coleman’S Cooking Ltd | Manufacturing | 2020 |
| Colin Addis Design Limited | Administrative & support | 2024 |
| Colin Noble Consulting Ltd | Administrative & support | 2023 |
| Colin William Limited | Other services | 2017 |
| COLIN45FASHION Connections Limited | Wholesale & retail | 2018 |
| Colinwilliam(Nw) Ltd | Education | 2025 |
| Collaborative Building Services (MEP) Ltd | Administrative & support | 2024 |
| Collaborative Insolvency Compliance Services Limited | Professional & scientific | 2024 |
| Collections and Stuff Ltd | Wholesale & retail | 2020 |
| Collier Developments Limited | Real estate | 2023 |
| Collins Consulting Limited | Administrative & support | 2020 |
| Collins USD Ltd | Administrative & support | 2026 |
| Colne Dental Care Limited | Health & social care | 2023 |
| Colombe Property Limited | Real estate | 2013 |
| Colworth Design Services Limited | Administrative & support | 2007 |
| Combi Care Maintenance Limited | Construction | 2017 |
| Combi Doctor Ltd | Construction | 2026 |
| Combined Chemical Services (UK) Ltd | Wholesale & retail | 2008 |
| Combined Lift Solutions Ltd | Professional & scientific | 2020 |
| Combs Valley Environmental Limited | Professional & scientific | 2019 |
| Comfi Dwellings Limited | Real estate | 2017 |
| Comfortably Derek Ltd | Administrative & support | 2025 |
| Comma Sense Limited | Professional & scientific | 2016 |
| Commercial and Leisure Contractors (UK) Ltd. | Construction | 1997 |
| Commercial Cleans Cheshire Ltd | Administrative & support | 2025 |
| Commercial Curtain Wall Installations Limited | Construction | 2006 |
| Commercial Finance Made Simple Ltd | Financial services | 2024 |
| Commercial Management Solutions Ltd | Other services | 2019 |
| Commercial Tiling Solutions Ltd | Construction | 2019 |
| Commgroup Limited | Extraterritorial | 2008 |
| Commhoist Communications Limited | Professional & scientific | 2004 |
| Commhoist Limited | Construction | 1996 |
| Commhoist Logistics Limited | Professional & scientific | 2003 |
| Commissioning Validation Independent Services Ltd | Administrative & support | 2023 |
| Commodore Estates Limited | Real estate | 1989 |