| Crown Estate Acquisitions Limited | Real estate | 2003 |
| Crown Event Management Ltd | Hospitality | 2024 |
| Crown Healthcare Services Ltd | Health & social care | 2019 |
| Crown Holding Chingford Ltd | Real estate | 2017 |
| Crown JOB Developments Ltd | Construction | 2004 |
| Crown Line Freight Ltd | Wholesale & retail | 2010 |
| Crown Oak Ltd | Real estate | 2023 |
| Crown Property Investment Ltd | Real estate | 2019 |
| Crown Residential Properties Limited | Other services | 2020 |
| Crown Security Limited | Administrative & support | 2024 |
| Crown View Care Ltd | Health & social care | 2025 |
| Crown View Finance Limited | Financial services | 2025 |
| Crownbuild Energy Limited | Construction | 2023 |
| Crowned by DAN Ltd | Other services | 2022 |
| Crowned Combat Fight Gear Ltd | Wholesale & retail | 2026 |
| Crownfield Group Ltd | Real estate | 2023 |
| Crownguard Security Ltd | Administrative & support | 2025 |
| Crownhire Recruitment Ltd | Administrative & support | 2025 |
| Crownkey Letting Ltd | Real estate | 2025 |
| Crownline Logistics Ltd | Transport & logistics | 2015 |
| Crownmart Ltd | Wholesale & retail | 2026 |
| Crownpoint Ventures Ltd | Financial services | 2026 |
| Crownstone Education Group Limited | Administrative & support | 2025 |
| Crownstone Global Ltd | Construction | 2020 |
| Croydon Trading Wholesale Ltd | Wholesale & retail | 2025 |
| Crozier Lettings and Development Limited | Real estate | 2019 |
| Crrow Ltd | Construction | 2022 |
| Crumcraze Ltd | Hospitality | 2026 |
| Cruxstone Development and Investment UK Ltd | Real estate | 2023 |
| Cryms Fire Ltd | Construction | 2026 |
| Crypto & Fintech Consulting Ltd | Administrative & support | 2021 |
| Cryptographic Media Limited | Administrative & support | 2020 |
| Cryptopak Solutions Ltd | Information & communication | 2010 |
| Cryptotax Limited | Information & communication | 2021 |
| Cryptoxhop Ltd | Manufacturing | 2024 |
| Crystal Cleanerz Ltd | Administrative & support | 2025 |
| Crystal Electrical Ltd | Energy | 2014 |
| Crystal Furniture & Flooring Ltd | Wholesale & retail | 2009 |
| Crystal Global Payments Limited | Wholesale & retail | 2023 |
| Crystal Global Property Ltd | Real estate | 2025 |
| Crystal Investments Ltd | Real estate | 2020 |
| Crystal Orchard Ltd | Financial services | 2020 |
| Crystal Peaks Consulting Ltd | Information & communication | 2014 |
| Crystal Peaks Property Ltd | Real estate | 2017 |
| Crystal Shopfronts Ltd | Manufacturing | 2019 |
| Crystal Softech Ltd | Other services | 2025 |
| Crystal WAX Hand Car Wash Ltd | Administrative & support | 2017 |
| Crystal Wolf Films Ltd | Transport & logistics | 2017 |
| Crystalclean RO Ltd | Administrative & support | 2025 |
| Crystalclear Disinfection Ltd | Administrative & support | 2025 |
| Crystals Etax Management Ltd. | Administrative & support | 2012 |
| Crystille Lollipop Honey Ltd. | Other services | 2018 |
| Crystle Home Support Ltd | Health & social care | 2024 |
| CS Property and Consultancy Ltd. | Real estate | 1996 |
| CSA Drylining Ltd | Construction | 2026 |
| CSF Consultants Limited | Professional & scientific | 2014 |
| CSJ Trading Ltd | Wholesale & retail | 2020 |
| CSM Construction Ltd | Construction | 2021 |
| CSM Foundation | Education | 2018 |
| CSR Building Construction Ltd | Construction | 2017 |
| CSV Carpenters Ltd | Construction | 2023 |
| CT & PW Investments Limited | Real estate | 2024 |
| CT Tech Solutions Ltd | Information & communication | 2022 |
| CTA Comms Ltd | Construction | 2022 |
| CTC UK Lift Ltd | Construction | 2023 |
| Ctob Services Ltd | Construction | 2014 |
| CTV Bidco Ltd | Real estate | 2021 |
| Cube EAT Ltd | Hospitality | 2026 |
| Cube Enterprise Ltd | Wholesale & retail | 2018 |
| Cubic Design and Development Limited | Professional & scientific | 2023 |
| Cubify Ltd | Information & communication | 2019 |
| Cublu Ltd | Wholesale & retail | 2025 |
| Cubo Limited | Construction | 2016 |
| Cuckoo Fashion (UK) Limited | Wholesale & retail | 2015 |
| Cuddle Car Ltd | Wholesale & retail | 2024 |
| CUE Homes Ltd | Real estate | 2019 |
| CUE Property Ventures Ltd | Real estate | 2024 |
| Cuedart Limited | Professional & scientific | 2024 |
| Cuffley Service Centre Ltd | Other services | 2014 |
| Culai Mitu Limited | Construction | 2025 |
| Cultx Solutions Ltd | Information & communication | 2025 |
| Cumulus Healthcare Solutions Ltd | Information & communication | 2022 |
| Cunaxa Finance Ltd | Professional & scientific | 2023 |
| Cuppa Bubble Ltd | Wholesale & retail | 2022 |
| Cuppa Dough Ltd | Hospitality | 2024 |
| Cura LUX Holdings Limited | Financial services | 2025 |
| Curacura Ltd | Wholesale & retail | 2024 |
| Curate London Ltd | Wholesale & retail | 2025 |
| Cure Corner Limited | Wholesale & retail | 2025 |
| Cure Way Scientific Ltd | Manufacturing | 2025 |
| Cureclick Holdings Ltd | Wholesale & retail | 2023 |
| Curetechgroup Ltd | Information & communication | 2026 |
| Curious Kids 1 Ltd | Health & social care | 2026 |
| Curo Tutors Limited | Education | 2024 |
| Curran Estate Management Ltd | Real estate | 2026 |
| Currells Metalworks Ltd | Manufacturing | 2019 |
| Currencylink Ltd | Wholesale & retail | 2023 |
| Curry and Cart Limited | Hospitality | 2025 |
| Curry and Crust Ltd | Hospitality | 2024 |
| Curry Indian Limited | Hospitality | 2018 |