| Cavetech Consulting Limited | Professional & scientific | 2018 |
| Cawton for ALL Ltd | Administrative & support | 2024 |
| Cawton Ltd | Administrative & support | 2021 |
| CB (Leicester) Limited | Financial services | 2014 |
| CB Deeping Ltd | Other services | 2025 |
| CBA Asbestos Limited | Wholesale & retail | 2011 |
| CBA Environmental Limited | Extraterritorial | 2015 |
| CBA Group Limited | Professional & scientific | 2006 |
| CBA Limited | Extraterritorial | 2010 |
| CBL Engineering Limited | Manufacturing | 1980 |
| CBL Hydraulics Ltd | Manufacturing | 2020 |
| CBS Contractors (Lincs) Limited | Construction | 2016 |
| CC Elec Services Limited | Construction | 2024 |
| CC Heat Pumps Limited | Construction | 2024 |
| CC Heating & Plumbing Ltd | Construction | 2015 |
| CCC19 Ltd | Hospitality | 2025 |
| Ccnc Ltd | Transport & logistics | 2024 |
| Ccpw Limited | Administrative & support | 2012 |
| Ccrc (Oakham) Limited | Administrative & support | 2018 |
| CD Holding Limited | Construction | 2015 |
| CD Vehicle Services Ltd | Professional & scientific | 2026 |
| Cdbhfam Ltd | Administrative & support | 2025 |
| CDD Automation Solutions Limited | Information & communication | 1981 |
| Cddc Engineering Ltd | Administrative & support | 2021 |
| CDF Build Ltd | Administrative & support | 2024 |
| CDM Property Development Limited | Real estate | 2023 |
| CDS Trans Services Ltd | Administrative & support | 2017 |
| CE Analysis Ltd | Financial services | 2022 |
| CE Care Consultancy Ltd | Professional & scientific | 2026 |
| CE Innovations LLP | | 2025 |
| Cecil Instruments Limited | Real estate | 1967 |
| Cedar House Accounting Ltd | Professional & scientific | 2019 |
| Cedony Group Limited | Real estate | 2023 |
| CEH Recruitment Limited | Administrative & support | 2019 |
| Ceibo Production Ltd | Wholesale & retail | 2022 |
| Celdos Ltd | Wholesale & retail | 2024 |
| Celebrant Ltd | Wholesale & retail | 2020 |
| Celect Management Services Ltd | Professional & scientific | 2014 |
| Celestial Smart Homes (UK) Limited | Other services | 2024 |
| Celik Limited | Hospitality | 2019 |
| Cell Care Limited | Wholesale & retail | 2018 |
| Cell Phone Peterborough Ltd | Wholesale & retail | 2024 |
| Cell Regeneration Ltd | Health & social care | 2011 |
| Cellys Peterborough Ltd | Other services | 2023 |
| Celta Distribution Limited | Real estate | 2008 |
| Celta Holding Ltd | Financial services | 2026 |
| Celta Limited | Wholesale & retail | 2017 |
| Cembrowski Ltd | Transport & logistics | 2018 |
| Cemflo Limited | Construction | 2016 |
| Cencura Ltd | Health & social care | 2023 |
| Cent'Anni Cosmetics Limited | Wholesale & retail | 2023 |
| Center Line Limited | Manufacturing | 2012 |
| Central Auto Care Ltd | Wholesale & retail | 2005 |
| Central Car Sales Ltd | Wholesale & retail | 2016 |
| Central Carpets Pboro Ltd | Wholesale & retail | 2024 |
| Central Driving School Limited | Education | 2025 |
| Central Estimating Limited | Professional & scientific | 2002 |
| Central Garage(Uppingham)Limited | Wholesale & retail | 1952 |
| Central Health Barrow Limited | Health & social care | 2024 |
| Central London Aesthetics Limited | Health & social care | 2018 |
| Central Mini Market Ltd | Wholesale & retail | 2025 |
| Central Office Equipment Limited | Wholesale & retail | 1983 |
| Central Point Personnel Ltd | Administrative & support | 2023 |
| Centralized Ambulance Transport Services Ltd | Transport & logistics | 2021 |
| Centralvape.Shop Ltd | Wholesale & retail | 2017 |
| Centregrange Limited | Financial services | 2012 |
| Centrocare Ltd | Health & social care | 2024 |
| Centty Ltd | Wholesale & retail | 2024 |
| Century Cables and Controls Ltd | Professional & scientific | 2018 |
| CEO Made Ltd | Wholesale & retail | 2023 |
| Ceres Health Ltd | Health & social care | 2022 |
| Cereste Consultancy Limited | Professional & scientific | 2011 |
| Cereste Holdings Limited | Financial services | 2011 |
| Cerko Trans Ltd | Transport & logistics | 2015 |
| Cernunnos Capital Ltd | Financial services | 2026 |
| Certified Home Improvements Ltd | Construction | 2024 |
| Certum IT Connect Limited | Wholesale & retail | 2024 |
| Certus Risk Management Limited | Financial services | 2014 |
| Cervidae Ltd | Hospitality | 2014 |
| CES Group UK Ltd | Construction | 2005 |
| CES Ventilation Hygiene Limited | Manufacturing | 2015 |
| Cesar & Co Dog Walking Ltd | Other services | 2025 |
| Cesare Robotics Limited | Manufacturing | 2015 |
| Cesna Ltd | Transport & logistics | 2017 |
| Ceyla & YOU Ltd | Wholesale & retail | 2026 |
| Cezair Limited | Transport & logistics | 2017 |
| Cezar Spedition Ltd | Transport & logistics | 2025 |
| CF Pharma UK Ltd | Manufacturing | 2021 |
| CFD Auto Repairs Ltd | Wholesale & retail | 2025 |
| CFD Drivers Ltd | Transport & logistics | 2023 |
| CFS Consulting Ltd | Professional & scientific | 2020 |
| CFS Frelog Ltd | Transport & logistics | 2025 |
| CG Quick Store Ltd | Wholesale & retail | 2024 |
| CG11 Ltd | Wholesale & retail | 2026 |
| CGB Properties Limited | Real estate | 2000 |
| Cggas LLP | | 2001 |
| CGP Electrics Limited | Manufacturing | 2013 |
| CGR Offshore Renewables Limited | Professional & scientific | 2026 |
| Cgsprinz Limited | Professional & scientific | 2009 |
| CH Gorsi Ltd | Transport & logistics | 2026 |