| Clive Anthony Property Limited | Real estate | 2014 |
| Clive Durose Limited | Manufacturing | 1988 |
| Clive Properties Limited | Real estate | 2019 |
| Clivebarcker Limited | Education | 2017 |
| Cliveden Homes Ltd | Real estate | 2000 |
| Clivelake Limited | Professional & scientific | 1982 |
| CLJ Healthcare Ltd | Health & social care | 2023 |
| CLJ International Limited | Transport & logistics | 2024 |
| Cljb Limited | Professional & scientific | 2025 |
| CLK Art Ltd | Wholesale & retail | 2018 |
| Clka Consulting Ltd | Other services | 2024 |
| Clka Holdings Limited | Professional & scientific | 2024 |
| CLL Properties Limited | Real estate | 2024 |
| CLM Consultancy Services Ltd | Information & communication | 2026 |
| CLM Projects and Programmes Ltd | Information & communication | 2018 |
| CLM Property Group Ltd | Real estate | 2025 |
| Clmj Limited | Information & communication | 2025 |
| CLN Community Limited | Other services | 2021 |
| Clnq Limited | Health & social care | 2019 |
| Cloacina Limited | Real estate | 2021 |
| Clocktower Country Estates Ltd | Agriculture & fishing | 2026 |
| Clockwater Limited | Real estate | 2001 |
| Clockwork Automation Ltd | Arts & recreation | 2012 |
| Clockwork Services Security Limited | Administrative & support | 2002 |
| Clodoc Limited | Information & communication | 2014 |
| Cloei AI Limited | Information & communication | 2025 |
| Cloisters Court Residents Association Limited | Households | 2002 |
| Clonoose Chemicals Ltd. | Wholesale & retail | 2003 |
| Close & Convert Consulting Ltd | Professional & scientific | 2024 |
| Close Brothers Properties Ltd | Real estate | 2025 |
| Close Estates Limited | Real estate | 2019 |
| Close UP Entertainment Ltd | Information & communication | 2023 |
| Close Your Company Limited | Extraterritorial | 2023 |
| Closed Door Industries Ltd | Hospitality | 2019 |
| Closedsource Ltd | Information & communication | 2025 |
| Closer Connections Limited | Education | 2018 |
| Closer Craft Limited | Administrative & support | 2026 |
| Closetfuture Limited | Wholesale & retail | 2025 |
| Cloth CAP Productions Limited | Information & communication | 2015 |
| Clothes City Limited | Wholesale & retail | 2025 |
| Clothes X Limited | Wholesale & retail | 2025 |
| Clothing Consultancy Limited | Wholesale & retail | 2012 |
| Clothing Culture Ltd | Wholesale & retail | 2025 |
| Clothing Online Limited | Wholesale & retail | 2021 |
| Cloud 101 Studio Ltd | Manufacturing | 2024 |
| Cloud 2 Limited | Information & communication | 2008 |
| Cloud 24 Ltd | Wholesale & retail | 2024 |
| Cloud 9 Computing Solutions Limited | Information & communication | 2014 |
| Cloud Accountancy & Tax Solutions LLP | | 2022 |
| Cloud Accountancy (Whitefield) Ltd | Professional & scientific | 2018 |
| Cloud AGE Accountancy Ltd | Professional & scientific | 2018 |
| Cloud Agri Ltd | Agriculture & fishing | 2013 |
| Cloud Associates Limited | Information & communication | 2010 |
| Cloud Beds Ltd | Manufacturing | 2025 |
| Cloud Capital Investment Limited | Real estate | 2019 |
| Cloud CFO Solutions Ltd | Professional & scientific | 2020 |
| Cloud Clinic Beauty Ltd | Other services | 2025 |
| Cloud Commerce Group Ltd | Information & communication | 2003 |
| Cloud Commerce MCR Ltd | Wholesale & retail | 2024 |
| Cloud Eighty Eight Ltd | Information & communication | 2022 |
| Cloud Energy Software Limited | Professional & scientific | 2014 |
| Cloud Enterprise Software Limited | Administrative & support | 2010 |
| Cloud Healthcare Ltd | Wholesale & retail | 2017 |
| Cloud HSE Consulting Ltd | Professional & scientific | 2026 |
| Cloud Imperium Games Limited | Manufacturing | 2013 |
| Cloud Imperium Rights Ltd. | Professional & scientific | 2017 |
| Cloud Imperium UK Ltd. | Information & communication | 2013 |
| Cloud Maintenance MCR Ltd | Other services | 2024 |
| Cloud Mobile Limited | Information & communication | 2025 |
| Cloud N SIP Limited | Wholesale & retail | 2025 |
| Cloud NU Limited | Information & communication | 2018 |
| Cloud Properties Solutions Ltd | Households | 2026 |
| Cloud Ridge Investment Group Ltd | Extraterritorial | 2026 |
| Cloud S7VEN Ltd | Wholesale & retail | 2021 |
| Cloud Services (MCR) Ltd | Financial services | 2021 |
| Cloud Seven Clothing Limited | Wholesale & retail | 2024 |
| Cloud Tax Solutions Ltd | Professional & scientific | 2018 |
| Cloud Vape Shop Ltd | Wholesale & retail | 2023 |
| Cloud Wallet Technologies Ltd | Professional & scientific | 2021 |
| CLOUD1MEDIA Ltd | Information & communication | 2019 |
| CLOUD88 Limited | Wholesale & retail | 2026 |
| Cloudara Shop Limited | Wholesale & retail | 2025 |
| Cloudbase App Ltd | Information & communication | 2026 |
| Cloudcompare.Com Limited | Extraterritorial | 2017 |
| Cloudcourier Tech Limited | Information & communication | 2026 |
| Clouddrop Consulting Limited | Information & communication | 2024 |
| Cloudfiber Limited | Wholesale & retail | 2026 |
| Cloudgineers Ltd | Information & communication | 2020 |
| Cloudguard Ltd | Information & communication | 2020 |
| Cloudineers Limited | Information & communication | 2018 |
| Cloudkraze Limited | Hospitality | 2025 |
| Cloudmint Ltd | Wholesale & retail | 2025 |
| Cloudnet Technologies Limited | Information & communication | 2022 |
| Cloudpay Networks Ltd | Wholesale & retail | 2025 |
| Cloudrisk Limited | Administrative & support | 2011 |
| Clouds One Services Ltd | Other services | 2016 |
| Cloudshire Linen Limited | Wholesale & retail | 2025 |
| Cloudstudiosmcr Ltd | Professional & scientific | 2024 |
| Cloudstuff Ltd | Information & communication | 2010 |
| Cloudtag Tech Services Limited | Wholesale & retail | 2019 |