| Crestline Autos Limited | Wholesale & retail | 2025 |
| Crestline Estates Ltd | Construction | 2024 |
| Crestline Solutions Ltd | Information & communication | 2025 |
| Crestmore Trading Limited | Information & communication | 2022 |
| Crestoneuk Limited | Wholesale & retail | 2023 |
| Crestora Limited | Wholesale & retail | 2026 |
| Crestos Care Ltd | Health & social care | 2022 |
| Crestpoint Global Services Limited | Wholesale & retail | 2026 |
| Crestpoint HR Services Ltd | Professional & scientific | 2025 |
| Crestpoint Living Ltd | Real estate | 2025 |
| Crestridge Traders Ltd | Wholesale & retail | 2026 |
| Crestside Ltd | Real estate | 2005 |
| Crestview Housing Ltd | Real estate | 2025 |
| Crestwood Housing Ltd | Real estate | 2025 |
| Crestwood Partners Ltd | Wholesale & retail | 2026 |
| Crestwood Property Investments Ltd | Real estate | 2025 |
| Creteways Limited | Construction | 2018 |
| Crevato Properties Ltd | Real estate | 2022 |
| Crew Electrical Services Ltd | Construction | 2022 |
| Crew Stays Ltd | Hospitality | 2026 |
| Crewcut Barbers Ltd | Other services | 2023 |
| Crewe Properties Ltd | Real estate | 2023 |
| Crewhost Limited | Hospitality | 2025 |
| Crewline Security Ltd | Administrative & support | 2025 |
| Crewline Services Ltd | Financial services | 2021 |
| Crewtic Ltd | Information & communication | 2026 |
| Crexa Ltd | Information & communication | 2025 |
| CRG Build Ltd | Construction | 2025 |
| CRG Education Ltd | Administrative & support | 2025 |
| CRG Homes Limited | Real estate | 2025 |
| CRG Medical Services Ltd | Administrative & support | 2017 |
| CRG Recruitment Ltd | Administrative & support | 2022 |
| CRG2019B Limited | Professional & scientific | 2019 |
| CRH (UK) Limited | Financial services | 1978 |
| CRH Building Products Limited | Financial services | 1961 |
| CRH Finance (U.K.) PLC | Professional & scientific | 1987 |
| CRH France Holdings UK Limited | Financial services | 2015 |
| CRH Investments (UK) Limited | Financial services | 1943 |
| CRH Romania Holdings UK Limited | Professional & scientific | 2010 |
| CRH Serbia Holdings UK Limited | Financial services | 1997 |
| CRH West Midlands Limited | Administrative & support | 2007 |
| Cria Technologies Ltd | Information & communication | 2020 |
| Crib Connect Ltd | Real estate | 2025 |
| Crica Delivery Ltd | Wholesale & retail | 2017 |
| Cricetus Ltd. | Professional & scientific | 2012 |
| Crick Gardens CIC | Other services | 2020 |
| Cricketfields (Phase 2) Management Company Limited | Households | 1990 |
| Cricketfields (Phase 2) RTM Company Limited | Households | 2012 |
| Crickle Limited | Information & communication | 2015 |
| Crickley Fields Management Company Limited | Households | 2024 |
| Crime Intelligence Security Limited | Administrative & support | 2021 |
| Crimestop Security & Fire Ltd | Administrative & support | 1986 |
| Crimscote Construction Limited | Construction | 2003 |
| Crimson Limited | Information & communication | 2000 |
| Crimson Supported Housing Ltd | Real estate | 2026 |
| Crinex Global Ltd | Information & communication | 2024 |
| Crinose (General Engineers) Limited | Professional & scientific | 1915 |
| Crionet UK Limited | Wholesale & retail | 2023 |
| Criou Biochar Limited | Manufacturing | 2025 |
| Criou Carbon Limited | Construction | 2022 |
| Criou Online Limited | Wholesale & retail | 2020 |
| Crisan Cleaning Ltd | Administrative & support | 2025 |
| Crisative Limited | Administrative & support | 2004 |
| Criserb Ltd | Manufacturing | 2025 |
| Crisp and Drip Ltd | Hospitality | 2026 |
| Crisptech Ltd | Information & communication | 2026 |
| Crispy Chicken 1 Ltd | Hospitality | 2026 |
| Crispy Chicken Ltd | Hospitality | 2021 |
| Crispy OX26 Limited | Hospitality | 2024 |
| Crispy Pizza & Grill Ltd | Hospitality | 2022 |
| Crispy Water Limited | Information & communication | 2003 |
| Cristal Clear Solutions Ltd | Administrative & support | 2025 |
| Cristal DE Settat Lighting Limited | Wholesale & retail | 2003 |
| Cristi International Limited | Transport & logistics | 2025 |
| Cristi Serv Ltd | Transport & logistics | 2016 |
| Cristi Transport Ltd | Transport & logistics | 2018 |
| CRISTI18 Ltd | Transport & logistics | 2019 |
| Cristian Cars Ltd | Manufacturing | 2025 |
| Cristian CSB Limited | Transport & logistics | 2017 |
| Cristian Matei Logistics Limited | Transport & logistics | 2021 |
| CRISTINA1 Ltd | Wholesale & retail | 2026 |
| Cristinel’S Good Service Builder Ltd | Construction | 2026 |
| Cristo Group Ltd | Construction | 2020 |
| Criteria Arts Limited | | 1972 |
| Criterion Assets Ltd | Real estate | 2024 |
| Critical Asset Services Group Limited | Financial services | 2025 |
| Critical Care International Limited | Health & social care | 2016 |
| Critical Medical Transport Ltd | Other services | 2025 |
| Critical Path Assets Limited | Real estate | 2022 |
| Critical Path Group Ltd | Information & communication | 2019 |
| Crivelli Ltd | Real estate | 2025 |
| CRJ Living CIC | Real estate | 2024 |
| CRL Realisations 2020 Limited | Transport & logistics | 1993 |
| CRM Care Services Ltd | Health & social care | 2020 |
| CRM Legacy Ltd | Real estate | 2024 |
| CRM Value Ltd | Administrative & support | 2013 |
| Crmc Electrical Ltd | Other services | 2017 |
| Croc Smiles Ltd | Administrative & support | 2021 |
| Croc Stick Ltd | Wholesale & retail | 2024 |
| Crockett Comms Ltd | Information & communication | 2023 |