| Craftyedits Limited | Information & communication | 2023 |
| Craig Gardner Designs Ltd | Professional & scientific | 2019 |
| Craig Mcgibbon Ltd | Administrative & support | 2013 |
| Crakers Mead Limited | Households | 1994 |
| Cramer Music Limited | Information & communication | 1991 |
| Cranbrook Rowan Management Limited | Households | 1988 |
| Crandle H Ltd | Professional & scientific | 2013 |
| Cranem Ltd | Financial services | 2021 |
| Cranes Services Ltd | Real estate | 2024 |
| Cranford Parkway Limited | Real estate | 2023 |
| Cranky Dog Limited | Information & communication | 2007 |
| Crash Network Ltd | Other services | 2025 |
| Crash Repair Body Work Ltd | Wholesale & retail | 2026 |
| Cratia Ltd. | Other services | 2012 |
| Craven Lodge (Management) Company Limited | Households | 1966 |
| Crawford Direct Limited | Other services | 2019 |
| Cray Bathrooms Ltd | Manufacturing | 2025 |
| Crayford ASH Limited | Other services | 2003 |
| Crayon Global Limited | Households | 2022 |
| Crazycow Melts Ltd | Wholesale & retail | 2026 |
| CRD Wealth Management Ltd | Financial services | 2018 |
| Crear Group Ltd | Administrative & support | 2022 |
| Create Your Beauty Limited | Other services | 2015 |
| Creative Business Management Ltd | Information & communication | 2023 |
| Creative Contract Furniture Ltd | Wholesale & retail | 2007 |
| Creative Eagles Ltd | Wholesale & retail | 2023 |
| Creative Intent Ltd | Wholesale & retail | 2025 |
| Creative Juices Brewing Company Ltd | Manufacturing | 2018 |
| Creative Marketing Firm Ltd | Professional & scientific | 2025 |
| Creative Punch Limited | Information & communication | 2020 |
| Creative Reef Ltd | Agriculture & fishing | 2024 |
| Creativouse IT Consultancy Ltd | Information & communication | 2019 |
| Credence Apparel Limited | Wholesale & retail | 2019 |
| Credence Enterprise Private Limited | Wholesale & retail | 2025 |
| Creed Asset Management Ltd | Financial services | 2019 |
| Creed Lane Property Ltd | Real estate | 2025 |
| Creeda Limited | Information & communication | 2026 |
| Creo Invent Ltd | Administrative & support | 2019 |
| Crepe Van Limited | Hospitality | 2021 |
| Crescent Biologicals Ltd | Wholesale & retail | 2025 |
| Crescent Financial Consulting Ltd | Administrative & support | 2016 |
| Crescent Point Ltd | Construction | 2025 |
| Cressington Scientific Instruments Limited | Professional & scientific | 1972 |
| Cresswell Cadenhead & Co Limited | Financial services | 2001 |
| Crest Plus Operations Limited | Extraterritorial | 2024 |
| Crest Property Services Ltd | Real estate | 2025 |
| Cretu Contractors Ltd | Construction | 2024 |
| Crftd Studios Ltd | Information & communication | 2026 |
| CRG Interiors Ltd | Construction | 2022 |
| Crick Management Company Limited | Real estate | 2014 |
| Cricket Life Stories Ltd | Professional & scientific | 2020 |
| Crimsora Limited | Wholesale & retail | 2018 |
| Criqtr Limited | Manufacturing | 2025 |
| Cris Speed Ltd | Transport & logistics | 2017 |
| CRIS360 Ltd | Construction | 2015 |
| Crisalist Ltd | Information & communication | 2013 |
| Crispin & Borst Limited | Construction | 1964 |
| Crispin & Borst Retirement Homes Limited | Professional & scientific | 1958 |
| Crispin Street Traders Ltd | Hospitality | 2026 |
| Crispy Dosa Watford Ltd | Hospitality | 2021 |
| Cristal Facades Ltd | Manufacturing | 2022 |
| Cristi Popescu Limited | Transport & logistics | 2022 |
| Criterion Consulting Limited | Information & communication | 2008 |
| Critical Moments Limited | Extraterritorial | 2009 |
| Critical Solutions Ltd | Construction | 2024 |
| Crja Ltd | Wholesale & retail | 2025 |
| CRM Architects Limited | Professional & scientific | 2016 |
| CRM Healthy Solutions Ltd | Wholesale & retail | 2016 |
| Crmj Limited | Health & social care | 2020 |
| Croftmex Consultancy Limited | Health & social care | 2011 |
| Crombach TM Ltd | Construction | 2019 |
| Cromwell Business Centre Management Company Limited | Real estate | 1991 |
| Crontab Ltd | Information & communication | 2019 |
| Cross Keys International Limited | Other services | 2008 |
| Cross Legal Ltd | Professional & scientific | 2021 |
| Cross Swords Construction Ltd | Construction | 2019 |
| Crossfit Luton Limited | Education | 2025 |
| Crosshill Solutions Ltd | Professional & scientific | 2022 |
| Crosstalk Solutions Ltd | Information & communication | 2013 |
| Crowlee Art Ltd | Construction | 2025 |
| Crown & Co. Solutions Ltd | Wholesale & retail | 2022 |
| Crown Axis International Ltd | Wholesale & retail | 2025 |
| Crown Costs Consultants Ltd. | Professional & scientific | 2005 |
| Crown House Property LLP | | 2010 |
| Crown Lodge (Salisbury Avenue) Limited | Real estate | 1998 |
| Crown Lodge Maintenance and Services Ltd | Households | 2024 |
| Crown Perch Ltd | Wholesale & retail | 2025 |
| Crownfield Solicitors Ltd | Professional & scientific | 2026 |
| Crownlights Property Development and Management Limited | Real estate | 2019 |
| Crownstone Investments Ltd | Construction | 2024 |
| Crownstone UK Ltd | Professional & scientific | 2014 |
| Croxleypack Ltd | Administrative & support | 2020 |
| Croydon Care Holding Limited | Health & social care | 2023 |
| CRS Insights Limited | Administrative & support | 2015 |
| CRS Property Investments Limited | Real estate | 2015 |
| Crumbold Holdings Ltd | Financial services | 2025 |
| Crunchlab Cereals Ltd | Manufacturing | 2021 |
| Crusader Properties Ltd. | Real estate | 2021 |
| Crusader Property Solutions Ltd | Real estate | 2023 |
| Crut Construction Ltd | Construction | 2015 |