| COX Costello & Horne Limited | Professional & scientific | 2002 |
| Cozentus Technologies UK Limited | Information & communication | 2019 |
| Cozmaetic Repairs Ltd | Other services | 2018 |
| CP (London) Services Ltd | Manufacturing | 2018 |
| CP and Sons Ltd | Other services | 2023 |
| CP Fast Track Ltd | Transport & logistics | 2026 |
| CP Park Road Ltd | Real estate | 2019 |
| CPD Investuk Limited | Real estate | 2016 |
| CPF Building Limited | Construction | 2018 |
| Cpfm Construction Ltd | Construction | 2019 |
| Cplm Construction Services Limited | Extraterritorial | 2019 |
| CPM Decorating Ltd | Construction | 2023 |
| CPM Locations Ltd | Information & communication | 2012 |
| Cpnr Transport Ltd | Transport & logistics | 2026 |
| CPR Communications Limited | Professional & scientific | 2018 |
| CPS Prime Contractors Limited | Construction | 2022 |
| Cptel Ltd | Construction | 2025 |
| CPU Close Protection Unit UK Ltd | Administrative & support | 2026 |
| CR Food and Wine Limited | Wholesale & retail | 2025 |
| CR Intertrade Ltd | Wholesale & retail | 2014 |
| CR Investment Properties Limited | Real estate | 2018 |
| CR2MB Properties Limited | Real estate | 2024 |
| CR84 Limited | Financial services | 2017 |
| Crackerjack Hire Limited | Administrative & support | 2016 |
| Crackerjack Holdings Limited | Administrative & support | 2016 |
| Craft Contracts Limited | Construction | 2020 |
| Crafters Global Ltd | Construction | 2022 |
| Craggle Productions Ltd | Information & communication | 2023 |
| Craig & Company (Properties) Limited | Construction | 1950 |
| Craig G Jones Limited | Professional & scientific | 2017 |
| Craig Hairdressing Limited | Other services | 2002 |
| Craig Mclean Limited | Administrative & support | 2008 |
| Craig Norman Print & Promotionals Limited | Professional & scientific | 2009 |
| Craig Norman Properties Ltd | Real estate | 2021 |
| Craigholme Girl Limited | Arts & recreation | 2024 |
| Cramlington Precision Forge Limited | Manufacturing | 2003 |
| Cranenburgh Limited | Professional & scientific | 1995 |
| Cranford Holdings Limited | Real estate | 2019 |
| Cranleigh Strategy Limited | Professional & scientific | 2025 |
| Craqit Ltd | Wholesale & retail | 2019 |
| Craven Hill Capital Investments Limited | Financial services | 2025 |
| Craven Hill Capital Limited | Financial services | 2019 |
| Cravy Express Ltd | Hospitality | 2025 |
| Crawley Resourcing Limited | Information & communication | 2021 |
| Craze Sports Ltd | Wholesale & retail | 2023 |
| Crazyfood Takeaway Ltd | Hospitality | 2025 |
| CRC Builders Ltd | Construction | 2020 |
| CRC Developments Limited | Real estate | 2024 |
| CRC Trans Ltd | Transport & logistics | 2023 |
| CRE8 Portfolio Limited | Construction | 2016 |
| Cream Estates Ltd | Financial services | 2016 |
| Creamix Limited | Hospitality | 2026 |
| Creamypan Roll Patrick Limited | Hospitality | 2025 |
| Create Digital Solutions Ltd | Information & communication | 2017 |
| Createcraft Limited | Other services | 2010 |
| Creative & Commercial Communications Limited | Arts & recreation | 1999 |
| Creative Bites Ltd | Hospitality | 2024 |
| Creative Cloud LAB Limited | Information & communication | 2012 |
| Creative Cores Media Group Ltd | Information & communication | 2011 |
| Creative Dawn Limited | Professional & scientific | 2011 |
| Creative Entertainment Ltd | Other services | 2009 |
| Creative Entertainment Two Limited | Wholesale & retail | 2020 |
| Creative IQ West Ealing Ltd | Education | 2025 |
| Creative Licence Ltd | Real estate | 2022 |
| Creative Media Ltd | Professional & scientific | 2017 |
| Creative Mess Ltd | Professional & scientific | 2018 |
| Creative Prints 56 Ltd | Manufacturing | 2024 |
| Creative Travel & Event Management Limited | Extraterritorial | 1993 |
| Creatively Dunn Limited | Professional & scientific | 2011 |
| Creativezones Solutions Limited | Information & communication | 2011 |
| Creativmind Ltd | Information & communication | 2025 |
| Cred Platform CIC | Administrative & support | 2024 |
| Credax Limited | Wholesale & retail | 2014 |
| Credcoll Holdings Limited | Real estate | 2022 |
| Creden Care Ltd | Health & social care | 2026 |
| Credence Advisors Ltd | Professional & scientific | 2018 |
| Credence Business Services Ltd | Professional & scientific | 2023 |
| Credence Records Limited | Administrative & support | 2021 |
| Credent Finserv Limited | Real estate | 2018 |
| Credenz Limited | Information & communication | 2012 |
| Creedar Limited | Real estate | 2015 |
| Creekside Village West Limited | Households | 2008 |
| Creepy Scrawlers Ltd | Information & communication | 2016 |
| Creffield Home Limited | Real estate | 2016 |
| Creme DE LA Cakes Limited | Manufacturing | 2017 |
| Crepe Ltd | Wholesale & retail | 2022 |
| Crepes Masters Ltd | Hospitality | 2019 |
| Crescent Capital Holdings Ltd | Real estate | 2019 |
| Crescent Computer Consultants Limited | Information & communication | 1993 |
| Crescent Head Properties Limited | Real estate | 2012 |
| Crescent Pharmacy Limited | Wholesale & retail | 2024 |
| Crescent River Consultancy Ltd | Administrative & support | 2013 |
| Crescere Property Investments Ltd | Real estate | 2024 |
| Cresco Estates 1 Ltd | Real estate | 2018 |
| Cresco Estates Management Ltd | Real estate | 2018 |
| Cresco Surya Limited | Real estate | 2019 |
| Cressar Limited | Professional & scientific | 2006 |
| Cresswell Development Ltd | Construction | 2021 |
| Crest College Ltd | Administrative & support | 2016 |
| Crest Estates Holdings Ltd | Real estate | 2018 |