| Clearwater Accounting Services Limited | Professional & scientific | 2022 |
| Clearway Operations Ltd | Water & waste | 2025 |
| Cleckheaton Barbers Limited | Other services | 2026 |
| Clemency Childcare Ltd | Health & social care | 2026 |
| Clems FIX Limited | Construction | 2025 |
| Cleodino Ltd. | Real estate | 2010 |
| Click Filing Ltd | Professional & scientific | 2025 |
| Click IT Beds Ltd | Manufacturing | 2025 |
| Click Next Ltd | Wholesale & retail | 2024 |
| Click Physio Ltd | Health & social care | 2014 |
| Click Shire Ltd | Information & communication | 2025 |
| Click UK Group Ltd | Information & communication | 2020 |
| Click World Shop Limited | Wholesale & retail | 2024 |
| Click-Delivered Ltd | Wholesale & retail | 2021 |
| CLICK2DOOR Ltd | Wholesale & retail | 2026 |
| Clickcarepharma Limited | Wholesale & retail | 2014 |
| Clickedge Solutions Limited | Professional & scientific | 2025 |
| Clickontrends Ltd | Wholesale & retail | 2025 |
| Clicks of Nature Ltd | Wholesale & retail | 2015 |
| Clickworldwide Ltd | Professional & scientific | 2020 |
| Clicpad FZC Ltd | Real estate | 2024 |
| Cliff Hollins RDA Centre | Education | 2014 |
| Cliffewood Property Services Ltd | Real estate | 2025 |
| Cliffhollins Riding School Limited | Education | 2006 |
| Clifford Spectre Ltd | Professional & scientific | 2022 |
| Cliftech Ltd | Wholesale & retail | 2022 |
| Clifton Gate Ltd | Hospitality | 2018 |
| Climaserve Limited | Construction | 2008 |
| Climate Innovation District 312 Utilities Ltd | Energy | 2017 |
| Climate Innovation District Utilities 216 Ltd | Energy | 2022 |
| Climate Innovation District Utilities 247 Ltd | Energy | 2020 |
| Climax Digitizing Ltd | Information & communication | 2022 |
| Clinical Defence Legal Services Ltd | Professional & scientific | 2025 |
| Clinical Systems Solutions Ltd | Information & communication | 2015 |
| Clinipharm Ltd | Health & social care | 2012 |
| Clip on Golf Limited | Wholesale & retail | 2025 |
| Clipper Recruitment Ltd | Administrative & support | 2026 |
| Clive Brook Electrical Limited | Manufacturing | 2015 |
| Clmilne Ltd | Public administration | 2025 |
| Close Watch Security Ltd | Administrative & support | 2020 |
| Close Watch Training Academy Ltd | Administrative & support | 2021 |
| Closetwiz Ltd | Wholesale & retail | 2023 |
| Cloth Craze Ltd | Wholesale & retail | 2025 |
| Clothing Solutions (for Disabled People) | Manufacturing | 2006 |
| Cloud 89 Ltd | Wholesale & retail | 2025 |
| Cloud Monkey Solutions Ltd | Other services | 2024 |
| Cloud Nine Wholesale Ltd | Wholesale & retail | 2025 |
| Cloud Professional Accountants Ltd | Professional & scientific | 2026 |
| CLOUD-9 Trader Limited | Wholesale & retail | 2026 |
| Cloudblobs Ltd | Wholesale & retail | 2023 |
| Cloudburst Enterprise Ltd | Wholesale & retail | 2025 |
| Cloudezee Technologies Limited | Information & communication | 2025 |
| Clouds Cafe Ltd | Hospitality | 2019 |
| Clouds Phone Ltd | Wholesale & retail | 2025 |
| Clouds Trading Limited | Wholesale & retail | 2026 |
| Cloudsta Holding Limited | Financial services | 2026 |
| Cloudsta Ltd | Information & communication | 2020 |
| Cloudwalkr Limited | Wholesale & retail | 2026 |
| Cloudxp Ltd | Information & communication | 2024 |
| Clover Coffee House Ltd | Hospitality | 2025 |
| Cloz Comfort ORI Limited | Wholesale & retail | 2025 |
| Club Alfa UK Ltd | Other services | 2019 |
| Club Food and Hospitality Ltd | Hospitality | 2014 |
| Club Taxis MK Ltd | Transport & logistics | 2019 |
| Clubhouse Sports Media Ltd | Professional & scientific | 2021 |
| Clutch Crew Limited | Administrative & support | 2025 |
| Clyde Consultancy Limited | Administrative & support | 2018 |
| CM Assets Holding Limited | Financial services | 2025 |
| CM Consulting Engineers Ltd | Professional & scientific | 2023 |
| CM Electrical Installation Contractors Ltd | Construction | 2024 |
| CM Properties (Yorkshire) Ltd | Real estate | 2022 |
| CM Trading & Consultancy Limited | Information & communication | 2016 |
| CMB Hire Limited | Administrative & support | 2025 |
| CMC Group Holdings Ltd | Real estate | 2024 |
| CMC Memory Services Ltd | Health & social care | 2025 |
| CMG Accountant Limited | Other services | 2008 |
| CMI Logistics Limited | Transport & logistics | 2009 |
| CMI Property Solutions Ltd | Construction | 2020 |
| Cmitservices Ltd | Information & communication | 2019 |
| CML Bathrooms Ltd | Construction | 2021 |
| CMM Security Services Ltd | Administrative & support | 2022 |
| Cmpyl Storage Ltd | Transport & logistics | 2025 |
| CMT Steel Services Limited | Wholesale & retail | 1999 |
| CN Building Solutions Ltd | Construction | 2016 |
| CN OO Ltd | Health & social care | 2020 |
| CN Security Solutions Ltd | Administrative & support | 2026 |
| CNA Heating & Plumbing Ltd | Construction | 2018 |
| Cncs Consultancy Limited | Wholesale & retail | 2024 |
| CNI Couriers Ltd | Transport & logistics | 2022 |
| Cnmi Limited | Hospitality | 2025 |
| CNN Property Improvements Ltd | Construction | 2022 |
| Co-Op Group Recruit Limited | Administrative & support | 2017 |
| Coach & Horses (Doncaster) Limited | | 2010 |
| Coach House 4X4 Limited | Wholesale & retail | 2016 |
| Coach ZAK Ltd | Arts & recreation | 2026 |
| Coaching Fore Success Ltd | Arts & recreation | 2023 |
| Coachtime Travel Ltd | Transport & logistics | 2019 |
| Coast to Coast Concert Production Limited | Administrative & support | 2003 |
| Coat Bay Limited | Real estate | 2024 |
| Coatman & Sons Construction Ltd | Construction | 2025 |