| Cleardon Developments Limited | Real estate | 2019 |
| Clearing Hearing Ltd | Health & social care | 2023 |
| Clearipple Ltd | Wholesale & retail | 2024 |
| Clearledgeruk Limited | Professional & scientific | 2025 |
| Clearline Online Retail Ltd | Wholesale & retail | 2024 |
| Clearpath AI Consulting Limited | Information & communication | 2026 |
| Clearpath Assest Limited | Real estate | 2026 |
| Clearpath Real Estate Group Limited | Real estate | 2026 |
| Clearpath Real Estate Limited | Real estate | 2026 |
| Clearpath Realty Limited | Real estate | 2025 |
| Clearpoint Transformation Limited | Professional & scientific | 2026 |
| Clearport Shipping Ltd | Transport & logistics | 2026 |
| Clearsight Accountants Limited | Professional & scientific | 2023 |
| Clearsight Group Limited | Financial services | 2026 |
| Clearsight HR Limited | Administrative & support | 2022 |
| Clearwater Business Services Limited | Professional & scientific | 2014 |
| Clearway Property Ltd | Real estate | 2022 |
| Clem's Accountancy Services Limited | Professional & scientific | 1999 |
| Clembrook (Properties) Limited | Real estate | 1961 |
| Clementi Capital Investment Limited | Real estate | 2022 |
| Clementine Gardens Property Ltd | Real estate | 2015 |
| Clements Management Company Limited | Real estate | 1989 |
| Clements Property Investments Ltd | Real estate | 2019 |
| Cleopatra Cleaning Ltd | Administrative & support | 2017 |
| Cleopatra Transporting Ltd | Transport & logistics | 2018 |
| Cleosa Global Ltd | Health & social care | 2016 |
| Clero AI Ltd | Information & communication | 2025 |
| Clevara Ltd | Wholesale & retail | 2026 |
| Cleves Builders Limited | Construction | 2018 |
| Clexpert Auto Solutions Ltd | Professional & scientific | 2020 |
| Clexpro Limited | Wholesale & retail | 2017 |
| CLI Secure Ltd | Information & communication | 2017 |
| Click & Buy PK Ltd | Wholesale & retail | 2025 |
| Click & GOT Ltd | Wholesale & retail | 2026 |
| Click 4 a Cake Ltd | Manufacturing | 2012 |
| Click and EAT Limited | Other services | 2023 |
| Click Comfort Ltd | Wholesale & retail | 2024 |
| Click Feast Ltd | Wholesale & retail | 2025 |
| Click Halal Ltd | Wholesale & retail | 2020 |
| Click Online Shopperz Limited | Wholesale & retail | 2024 |
| Clickcharmsolutions Limited | Wholesale & retail | 2025 |
| Clickrx Limited | Wholesale & retail | 2016 |
| Clickshopcenter Limited | Wholesale & retail | 2025 |
| Clickyourcart Ltd | Wholesale & retail | 2025 |
| Cliff Care Homes Ltd | Health & social care | 2007 |
| Clifton Medical Services Ltd | Health & social care | 2017 |
| Clifton Prime Estates Ltd | Real estate | 2023 |
| Climate Change London Ltd | Professional & scientific | 2024 |
| Clin Clin Ltd | Construction | 2022 |
| Clinicalpro Ltd | Administrative & support | 2012 |
| Clique Creative Limited | Information & communication | 2015 |
| Clique Management Limited | Construction | 2011 |
| Clisad Properties Limited | Real estate | 2024 |
| Clock Cark Ltd | Wholesale & retail | 2026 |
| Clock Court (Freehold) Limited | Other services | 2013 |
| Clockhouse Commercial Holdings Limited | Real estate | 2026 |
| Clocklease Limited | Other services | 2013 |
| Cloister Court Properties PLC | Construction | 1982 |
| Clore Tikva School Foundation | Education | 1997 |
| Closebay Ltd | Wholesale & retail | 2025 |
| Cloth Care Limited | Other services | 2016 |
| Clothing FUN Entertainment Games Ltd | Wholesale & retail | 2017 |
| Clothing Wear Limited | Wholesale & retail | 2013 |
| Cloud Accountant London Ltd | Professional & scientific | 2021 |
| Cloud Accounting Pros Ltd | Professional & scientific | 2021 |
| Cloud Affiniti Ltd | Professional & scientific | 2024 |
| Cloud Deals UK Ltd | Wholesale & retail | 2025 |
| Cloud Digital Marketing Ltd | Information & communication | 2025 |
| Cloud Enginering Experts Ltd | Information & communication | 2020 |
| Cloud Kinetic Solutions Limited | Information & communication | 2007 |
| Cloud Mission Ltd | Information & communication | 2022 |
| Cloud Neuron IT Solutions Limited | Information & communication | 2022 |
| Cloud Treatz Ltd | Wholesale & retail | 2025 |
| Cloudberry Gardens Holdings Ltd | Financial services | 2019 |
| Cloudex Skills Limited | Education | 2023 |
| CLOUDG9 Ltd | Information & communication | 2021 |
| Cloudious Limited | Information & communication | 2022 |
| Cloudivine Ltd | Wholesale & retail | 2025 |
| Cloudnest Properties Ltd | Real estate | 2024 |
| Cloudnine Limited | Energy | 2016 |
| Cloudnukes Ltd | Information & communication | 2022 |
| Cloudora Host Ltd | Information & communication | 2025 |
| Clouds Accountancy Limited | Professional & scientific | 2020 |
| Clover Contracting Ltd | Construction | 2019 |
| Cloverheart Properties Ltd | Real estate | 2025 |
| Cloverleaf Associates Limited | Hospitality | 2014 |
| Club.Ydl Ltd | Wholesale & retail | 2026 |
| Cluckers Ltd | Hospitality | 2022 |
| Clydeview Care Home Limited | Health & social care | 2011 |
| CM Community Ltd Ltd | Arts & recreation | 2024 |
| CM Fixing Limited | Construction | 2021 |
| CM Groundworks Essex Ltd | Construction | 2022 |
| CM Marketing Consultancy Ltd | Information & communication | 2014 |
| CM Necula Solution Ltd | Construction | 2019 |
| CM Panco Limited | Transport & logistics | 2017 |
| CM Sports Consultant Ltd | Arts & recreation | 2021 |
| CMA Consultancy Ltd | Professional & scientific | 2002 |
| CMC T-Shirts Limited | Wholesale & retail | 2023 |
| CME Fire Ltd | Construction | 2022 |
| Cmem Ltd | Hospitality | 2025 |