| Crossfray Limited | Wholesale & retail | 2012 |
| Crosskeys Dental Practice Limited | Health & social care | 2013 |
| Crossley Wines Limited | Wholesale & retail | 2016 |
| Crosslink Media Group Ltd | Wholesale & retail | 2025 |
| Crossrail Investments Limited | Real estate | 2014 |
| Crossways House RTM Company Limited | Households | 2010 |
| Crouch Painting Limited | | 1950 |
| Crow Orchards Estate Limited | Real estate | 2014 |
| Crowblack Films Limited | Information & communication | 2017 |
| Crowd Capital Ltd | Professional & scientific | 2019 |
| Crowdblaze Ltd | Other services | 2018 |
| Crowdjoy Network Technology Co., Ltd | Wholesale & retail | 2024 |
| Crowley Law Ltd | Professional & scientific | 2019 |
| Crown & Bezel Ltd | Professional & scientific | 2025 |
| Crown & Cart Ltd | Wholesale & retail | 2026 |
| Crown Brewery PLC | Extraterritorial | 1919 |
| Crown Buckley Limited | Extraterritorial | 1993 |
| Crown Buckley Taverns Limited | Extraterritorial | 1988 |
| Crown Capital 1996 Ltd | Financial services | 2021 |
| Crown Card Services Ltd | Information & communication | 2023 |
| Crown Cruise Limited | Wholesale & retail | 2025 |
| Crown Farms Meats Ltd | Manufacturing | 2020 |
| Crown Gardens Cardiff Limited | Administrative & support | 2013 |
| Crown House Day Nursery Limited | Education | 2006 |
| Crown Imperial Commodities UK Limited | Administrative & support | 2017 |
| Crown Kitchen Ltd | Hospitality | 2023 |
| Crown Quotes Ltd | Construction | 2017 |
| Crown Software Logic Ltd | Information & communication | 2025 |
| Crown Vista Limited | Administrative & support | 2026 |
| Crowncruiser Motors Ltd | Manufacturing | 2018 |
| Crownhill Constructions Ltd. | Construction | 2018 |
| Crownhill Topsoil & Aggregates Limited | Construction | 2021 |
| Crownhive Limited | Wholesale & retail | 2025 |
| Crowns Deal Ltd | Wholesale & retail | 2025 |
| Crowns Logistics Ltd | Transport & logistics | 2018 |
| Crownsmill Ltd | Extraterritorial | 2021 |
| Crownstone Solutions Limited | Construction | 2025 |
| Crowntime Ltd | Other services | 2018 |
| Crownvale Consulting Limited | Information & communication | 2026 |
| Crownwave Ltd | Wholesale & retail | 2024 |
| Croía Homes Ltd | Real estate | 2021 |
| CRS Care Limited | Health & social care | 2013 |
| CRS Cierresse Ltd | Real estate | 2019 |
| CRS Digital Ltd | Information & communication | 2025 |
| CRS Global Ltd | Manufacturing | 2025 |
| CRS Group Logistics Ltd | Transport & logistics | 2022 |
| CRS Trans Limited | Transport & logistics | 2018 |
| Crstiq Ltd | Wholesale & retail | 2025 |
| Crsytal Clear Co Ltd | Administrative & support | 2025 |
| Cruise Express Ltd | Wholesale & retail | 2018 |
| Cruising United Northern Territories Limited | Professional & scientific | 2025 |
| Crumblekind Ltd | Wholesale & retail | 2019 |
| Crumbles Catering Cardiff Limited | Hospitality | 2026 |
| Crumbs Couture Ltd | Wholesale & retail | 2015 |
| Crumbs Kitchen Cardiff Ltd | Hospitality | 2017 |
| Crunx Chicken Limited | Hospitality | 2026 |
| Cruscos Worldwide Ltd | Transport & logistics | 2015 |
| Crust Cream Ltd | Hospitality | 2026 |
| Crutes LA MAR Limited | Wholesale & retail | 1998 |
| Crux Crew Ltd | Water & waste | 2026 |
| Cruxden Developments Limited | Construction | 2014 |
| Crwys CUT Limited | Other services | 2024 |
| Crwys Fish Bar Ltd | Hospitality | 2019 |
| Crwys Loft Co Ltd | Real estate | 2025 |
| Crwys Road Bar Ltd | Hospitality | 2019 |
| Crwys Super Store Limited | Wholesale & retail | 2025 |
| Crwys Takeaway Limited | Hospitality | 2024 |
| CRX Compression Limited | Wholesale & retail | 2019 |
| Cryotech Holdings Limited | Professional & scientific | 2017 |
| Cryptaka Inc Limited | Professional & scientific | 2025 |
| Cryptinite Security Ltd | Administrative & support | 2026 |
| Crypto Banque Ltd | Financial services | 2019 |
| Crypto Cognoscenti Club Limited | Other services | 2021 |
| Crypto Orange Ltd | Professional & scientific | 2021 |
| Cryptondemand Ltd | Wholesale & retail | 2017 |
| Cryptouk Ltd | Financial services | 2018 |
| Crystal Administration Services Limited | Administrative & support | 2025 |
| Crystal Blinds Curtains Limited | Manufacturing | 2019 |
| Crystal Blue Homes Ltd | Real estate | 2017 |
| Crystal Chen Limited | Wholesale & retail | 2023 |
| Crystal Clear Realty Ltd | Wholesale & retail | 2025 |
| Crystal Clear Sussex Ltd | Administrative & support | 2019 |
| Crystal Cymru (Cardiff) Limited | Wholesale & retail | 2004 |
| Crystal Daze Ltd | Wholesale & retail | 2022 |
| Crystal Dental Limited | Health & social care | 2023 |
| Crystal Hospitality and Entertainments Ltd | Hospitality | 2019 |
| Crystal IT Services Limited | Information & communication | 2004 |
| Crystal Light Ltd | Extraterritorial | 2019 |
| Crystal Luxe Limited | Hospitality | 2023 |
| Crystal Precision SDH Ltd | Manufacturing | 2026 |
| Crystal Smart & Security Ltd | Information & communication | 2024 |
| Crystal Smith Limited | Information & communication | 2018 |
| Crystal Technology Group Ltd | Information & communication | 2024 |
| Crystal Trading UK Ltd | Construction | 2019 |
| Crystal Voice Data Ltd | Information & communication | 2021 |
| Crystal-Couture Limited | Wholesale & retail | 2015 |
| Crystalcore Services Ltd | Administrative & support | 2020 |
| Crystaledge Consulting Ltd | Wholesale & retail | 2023 |
| Crystalline Planning Consultants Limited | Professional & scientific | 2014 |
| Crystalp Ltd | Hospitality | 2019 |