| Cleos Delicatessen Ltd | Hospitality | 2026 |
| Clerico Limited | Administrative & support | 2010 |
| Clerke Creative Ltd | Information & communication | 2025 |
| Clermont Management Limited | Households | 2009 |
| Clerodendrum Services Limited | Health & social care | 2007 |
| Cleve Lodge Limited | Hospitality | 2005 |
| Clever Clicks Digital Ltd | Professional & scientific | 2021 |
| Clever Sausage Enterprises Limited | Other services | 2025 |
| Cleverflame Limited | Real estate | 1988 |
| Cleverflame Properties Limited | Real estate | 2024 |
| CLF Building Services Ltd | Construction | 2024 |
| CLF Property Group Ltd | Real estate | 2026 |
| CLF Technologies Limited | | 2002 |
| Cliara Technologies Ltd | Information & communication | 2026 |
| Click 19 Ltd | Information & communication | 2013 |
| Click N Collect Couriers Limited | Transport & logistics | 2024 |
| Click to Go Limited | Wholesale & retail | 2015 |
| Click Trade Ltd | Wholesale & retail | 2026 |
| Clickmarketingreps Limited | Information & communication | 2014 |
| Clicknetpro Ltd | Information & communication | 2014 |
| Click’N’Build Ltd | Wholesale & retail | 2025 |
| Client Accounts Ltd | Professional & scientific | 2026 |
| Client Saving Account Limited | Wholesale & retail | 2023 |
| Cliffe Investments Limited | Real estate | 2002 |
| Clifford & Peters Installations Ltd | Construction | 2006 |
| Clifford & Peters Properties Limited | Real estate | 2009 |
| Clifford Electrical Solutions Ltd | Construction | 2016 |
| Clifford EPS Ltd | Construction | 2023 |
| Clifford James Management Ltd | Construction | 2025 |
| Clifford Mccabe Ltd | Real estate | 2021 |
| Clifford Mccabe the Rookery Ltd | Real estate | 2025 |
| Clifford Property Holdings Ltd | Real estate | 2020 |
| Clifford Spink Associates Limited | Professional & scientific | 2003 |
| Cliffside Windows Limited | Manufacturing | 1967 |
| Clifton Cobs Limited | Administrative & support | 2003 |
| Clifton Hall Management Co Ltd | Households | 2010 |
| Clifton Insulation Ltd | Construction | 2025 |
| Clifton Solar INT Ltd | Construction | 2025 |
| Clifton View Ltd | Health & social care | 2015 |
| Clifton Welfare Rights Advice Centre | Administrative & support | 1996 |
| Cliftton Property Investment Ltd | Real estate | 2021 |
| Climb Your Mountain | Health & social care | 2008 |
| Clinicaa Limited | Other services | 2025 |
| Clinicavitalis Ltd | Health & social care | 2025 |
| Clinicianos Limited | Information & communication | 2024 |
| Clinintek Ltd | Information & communication | 2021 |
| Clinisolutions Ltd | Information & communication | 2016 |
| Clint Blinds Ltd | Wholesale & retail | 2020 |
| Clint J Services Ltd | Construction | 2013 |
| Clinton Terrace Properties Limited | Real estate | 2005 |
| Clinton View Ltd | Construction | 2021 |
| Clios Properties Ltd | Households | 2022 |
| Clip Creative Limited | Professional & scientific | 2011 |
| Clipsham Stone Cutting Company Limited | Mining & quarrying | 2017 |
| Clipston Properties Limited | Construction | 2021 |
| Clipstone Park Farms Ltd. | Agriculture & fishing | 2018 |
| Clive Fuller Plumbing & Heating Limited | Construction | 2002 |
| Clive Harrison Consultancy Ltd | Professional & scientific | 2014 |
| Clive Hewitt Architect Limited | Professional & scientific | 2021 |
| Clive Ingram Joinery & Building Services Ltd | Construction | 2026 |
| Cliveden House Consulting Ltd | Professional & scientific | 2019 |
| Clix Digital Limited | Information & communication | 2025 |
| CLO Community Inns Ltd | Hospitality | 2019 |
| Clock Tower Digital Limited | Information & communication | 2017 |
| Clockwork Property Network Ltd | Real estate | 2022 |
| Clockwork Signs (Nottingham) Ltd | Construction | 2017 |
| Clockwork Signs Limited | Professional & scientific | 2022 |
| Clohessy Change Consultancy Ltd | Professional & scientific | 2020 |
| Clop Soft Limited | Health & social care | 2013 |
| Close Order Ltd | Arts & recreation | 2024 |
| Clothes Line Rags Ltd | Water & waste | 2018 |
| Clothing Management Technology Limited | Manufacturing | 1996 |
| Clothing R US Limited | Wholesale & retail | 2025 |
| Clothvsona Limited | Professional & scientific | 2008 |
| Cloud 57 Limited | Wholesale & retail | 2016 |
| Cloud 9 Private Hire Ltd | Transport & logistics | 2018 |
| Cloud and CUP Ltd | Wholesale & retail | 2025 |
| Cloud Artisans Ltd | Information & communication | 2008 |
| Cloud Bridging and Commercial Limited | Financial services | 2024 |
| Cloud Cars Limited | Transport & logistics | 2012 |
| Cloud Database Company Limited | Wholesale & retail | 2020 |
| Cloud Educational ARC Limited | Information & communication | 2026 |
| Cloud House Crafts Limited | Households | 2025 |
| Cloud Mortgages Limited | Financial services | 2020 |
| Cloud Plumbing Ltd | Construction | 2020 |
| Cloud Service Solutions Limited | Construction | 2016 |
| Cloud Surveyors Limited | Professional & scientific | 2014 |
| CLOUD19 Solutions Limited | Hospitality | 2019 |
| CLOUD4FUTURE Limited | Information & communication | 2026 |
| Cloudantic IT Ltd | Information & communication | 2014 |
| Cloudcraft Solutions Limited | Information & communication | 2025 |
| Clouddia Limited | Information & communication | 2024 |
| Cloudnest Ltd | Information & communication | 2025 |
| Cloudport Trading Ltd | Wholesale & retail | 2025 |
| Clouds Vape Store Ltd | Manufacturing | 2018 |
| Cloudsheer UK Ltd | Information & communication | 2026 |
| Cloudworks Services Limited | Information & communication | 2015 |
| Clough Investments Limited | Real estate | 2019 |
| Clough Properties Ltd | Real estate | 2025 |
| Clove-Cb Ltd | Wholesale & retail | 2024 |