| Crest Global Provisions Limited | Wholesale & retail | 2026 |
| Crest Solutions Slough Ltd | Wholesale & retail | 2026 |
| Crestline Supply Ltd | Wholesale & retail | 2025 |
| Creststone RJK Developments Ltd | Construction | 2025 |
| Crewmate Services Ltd | Wholesale & retail | 2023 |
| Cribfix Ltd | Construction | 2025 |
| Cricket Coaching Academy Ltd | Education | 2022 |
| Crimson Cactus Group Ltd | Financial services | 2025 |
| Cris & Alex Ltd | Construction | 2015 |
| Crisana Care Limited | Administrative & support | 2023 |
| Criss Team Ltd | Construction | 2019 |
| Crissremovals Ltd | Transport & logistics | 2024 |
| Cristalina Cleaning Services Ltd | Administrative & support | 2025 |
| Cristi Services Ltd | Information & communication | 2025 |
| CRJ Installations Ltd | Construction | 2011 |
| CRL Holdings South Ltd | Financial services | 2026 |
| CRM4YOU Consulting Limited | Information & communication | 2008 |
| Crmtechgurus Limited | Professional & scientific | 2025 |
| Crockersfolly Limited | Hospitality | 2014 |
| Croft Education and IT Services Limited | Information & communication | 2010 |
| Croft Hill Court Associates RTE Company Limited | Households | 2005 |
| Croft Television Limited | Information & communication | 1987 |
| Crofthill Residents Association Limited | Households | 1996 |
| Cromer Court Management Company Limited | Households | 1994 |
| Cromsource Ltd | Professional & scientific | 2008 |
| Cromton Consultancy Ltd | Professional & scientific | 2019 |
| Cronasolutions Limited | Information & communication | 2009 |
| Crosschannel Estates Ltd | Real estate | 2025 |
| Crosscube Software Limited | Information & communication | 2021 |
| Crossflight Group Holdings Limited | Extraterritorial | 2021 |
| Crossflight Holdings Limited | Extraterritorial | 2020 |
| Crossflight Limited | Transport & logistics | 1987 |
| Crosslane Construction Ltd | Construction | 2016 |
| Crosslink Services Ltd | Real estate | 2021 |
| Crossrail Estates Ltd | Real estate | 2026 |
| Crowemozone Limited | Administrative & support | 2010 |
| Crown Bar & Lounge Ltd | Hospitality | 2024 |
| Crown Build Constructions Ltd | Construction | 2025 |
| Crown EA Ltd | Real estate | 2024 |
| Crown Executive Cars London Ltd | Transport & logistics | 2025 |
| Crown Garments Limited | Wholesale & retail | 2026 |
| Crown Guard Ltd | Administrative & support | 2025 |
| Crown Kitchens and Bedrooms Limited | Other services | 2021 |
| Crown Marble Ltd | Construction | 2014 |
| Crown Properties Holdings Limited | Real estate | 2023 |
| Crown Render Supplies Ltd | Wholesale & retail | 2025 |
| Crown Rise Ltd | Real estate | 2024 |
| Crown Stone Surveyors Limited | Professional & scientific | 2026 |
| Crown Wrap Customs Ltd | Construction | 2025 |
| Crownbridge Law Ltd | Professional & scientific | 2024 |
| Crowngate Estates Ltd | Real estate | 2025 |
| Crownline Executive Chauffeurs Ltd | Transport & logistics | 2025 |
| Crownpeak Roofing Ltd | Construction | 2026 |
| Crownshield Interiors Ltd | Construction | 2016 |
| Crowthorne Care (Hillingdon) Ltd | Health & social care | 2014 |
| Crowthorne Care Camberley Ltd | Health & social care | 2024 |
| Crowthorne Care Ealing Ltd | Health & social care | 2013 |
| Crowthorne Care Surrey Ltd | Health & social care | 2016 |
| Crowthorne Property Ltd | Real estate | 2026 |
| Crris Limited | Other services | 2020 |
| Cruise Giant Ltd | Administrative & support | 2025 |
| Cruisebrains Ltd | Information & communication | 2025 |
| Crumb to ME Ltd | Manufacturing | 2026 |
| CRW (Carrepairworld) Limited | Wholesale & retail | 2024 |
| Crwt Ltd | Transport & logistics | 2025 |
| CRYO303 Ltd | Other services | 2024 |
| Crypto Technology Limited | Information & communication | 2018 |
| Crystal Asset Management Limited | Real estate | 2014 |
| Crystal Care Agency Ltd | Administrative & support | 2020 |
| Crystal Cleaners (Slough) Limited | Other services | 2015 |
| Crystal Clear Learning Limited | Education | 2022 |
| Crystal Splashbacks Limited | Other services | 2018 |
| Crystal Traders London Ltd | Other services | 2020 |
| Crystal View Cleaning Ltd | Other services | 2014 |
| Crystal Vision Investment Ltd | Real estate | 2024 |
| Crystalex Cars Limited | Transport & logistics | 2024 |
| Crystalpharm Health Limited | Wholesale & retail | 2012 |
| Crystera UK Limited | Wholesale & retail | 2025 |
| Crystolite Ltd | Wholesale & retail | 2025 |
| CS Scenic Limited | Construction | 2024 |
| CSA Literary & Music Limited | Administrative & support | 2017 |
| CSC Screeding Limited | Construction | 2003 |
| CSD Investments Ltd | Real estate | 2021 |
| CSI UK Business Ltd | Transport & logistics | 2025 |
| CSL Trades Limited | Administrative & support | 2019 |
| CSM Consulting Services Ltd | Information & communication | 2017 |
| Csoe Ltd | Information & communication | 2025 |
| Csra Mena Limited | Professional & scientific | 2024 |
| Cssb Limited | Professional & scientific | 2021 |
| CT Business Support Ltd | Administrative & support | 2026 |
| CT Metals Ltd | Manufacturing | 2021 |
| CT84 Transport Ltd | Transport & logistics | 2020 |
| CTA Building Contractors Ltd | Construction | 2020 |
| CTA Marketing Ltd | Professional & scientific | 2025 |
| CTH Property Limited | Real estate | 2023 |
| CTM Biomass Limited | Professional & scientific | 2025 |
| CTM Courier Ltd | Transport & logistics | 2024 |
| Ctmendz Distributional Ltd | Transport & logistics | 2025 |
| CTP Southern Limited | Construction | 2019 |
| CTS Automotive Ltd | Professional & scientific | 2012 |