| Creative Individuals Limited | Information & communication | 2010 |
| Creative Intelligence Limited | Information & communication | 2006 |
| Creative KB (UK) Limited | Professional & scientific | 2021 |
| Creative Lingerie Limited | Professional & scientific | 2015 |
| Creative Midfield Limited | Professional & scientific | 2012 |
| Creative Monkey Innovations Ltd | Wholesale & retail | 2016 |
| Creative Robots Ltd | Information & communication | 2020 |
| Creatives Wings Ltd | Professional & scientific | 2019 |
| Creators of Mischief Limited | Professional & scientific | 2025 |
| Crecy Ventures Ltd | Wholesale & retail | 2025 |
| Credar Limited | Administrative & support | 2004 |
| Credence Online Limited | Professional & scientific | 2016 |
| Credinvest Capital Ltd | Professional & scientific | 2019 |
| Credit and Debit Limited | Administrative & support | 2020 |
| Creese and Mcknight Ltd | Construction | 2004 |
| Creids Group Ltd | Financial services | 2024 |
| Creids Real Estate Ltd | Construction | 2017 |
| Creids Residential Ltd | Real estate | 2024 |
| Creighton Court Management Limited | Households | 1982 |
| Crescendo Advisors Ltd | Arts & recreation | 2013 |
| Crescendo International Ltd | Real estate | 2015 |
| Crescent Court Residents Association (Clapham) Limited | Households | 1986 |
| Cresco Solutions Ltd | Administrative & support | 2012 |
| Crest and More Ltd | Other services | 2020 |
| Crest Commercial Freehold Limited | Professional & scientific | 2015 |
| Crest Commercial Limited | Real estate | 1986 |
| Crest Contracts Limited | Real estate | 2003 |
| Crewmet Pictures Ltd | Information & communication | 2023 |
| CRG Global Ltd | Financial services | 2024 |
| Cricketnext Ltd | Arts & recreation | 2025 |
| Crispy Basket Limited | Hospitality | 2025 |
| Crispy Box Wolverhampton Ltd | Hospitality | 2025 |
| Criss Deco Art Limited | Construction | 2024 |
| Crisstar Services Ltd | Construction | 2025 |
| Cristian Irimescu Ltd | Administrative & support | 2019 |
| Cristina Hair & Beauty Limited | Other services | 2016 |
| CRN Garden Ltd | Professional & scientific | 2018 |
| Croci & Cavalli Motors Ltd | Wholesale & retail | 2023 |
| Crolworth Limited | Information & communication | 1971 |
| Cronicle Gifts Limited | Wholesale & retail | 2025 |
| Croos Enterprise Limited | Wholesale & retail | 2015 |
| Cross Plane Fabrication Limited | Wholesale & retail | 2016 |
| Crosspath Consulting Ltd | Professional & scientific | 2016 |
| Crowd Invest Ltd | Information & communication | 2020 |
| Crowd Marketing Limited | Professional & scientific | 2026 |
| Crown London Developments Ltd | Construction | 2026 |
| Crown Royale Limited | Other services | 2023 |
| Crowncorp Ltd | Real estate | 2019 |
| Cruise Bags Limited | Real estate | 2013 |
| Crunchy Vibes Limited | Hospitality | 2025 |
| Crusty & Creamy Limited | Hospitality | 2023 |
| CRV Gudka & Co Limited | Professional & scientific | 2023 |
| Crylight Ltd | Real estate | 2021 |
| Cryptwage Limited | Information & communication | 2019 |
| Crystal Events Entertainment Limited | Manufacturing | 2021 |
| Crystelle Pereira Limited | Professional & scientific | 2022 |
| Crème & Curl London Ltd | Manufacturing | 2026 |
| CS Accountants Limited | Professional & scientific | 2012 |
| CS Survey Engineering Ltd | Professional & scientific | 2024 |
| CSK London Ltd | Wholesale & retail | 2011 |
| CSN Painting and Decorating Ltd | Construction | 2022 |
| CSR Investment Corporation Ltd | Administrative & support | 2021 |
| Csreimagined Ltd | Information & communication | 2025 |
| CST Utilities and Groundworks Ltd | Construction | 2019 |
| CT Decorating & Cleaning Services Ltd | Construction | 2015 |
| CTC Group Limited | Wholesale & retail | 2015 |
| Ctdt Limited | Information & communication | 2015 |
| CTW Management Limited | Households | 2009 |
| CU London Limited | Hospitality | 2012 |
| Cubana Global Ltd | Administrative & support | 2016 |
| Cube Room Productions Limited | Arts & recreation | 2018 |
| Cubefix Limited | Financial services | 2020 |
| Cubewise Software Ltd | Information & communication | 2021 |
| Cubic Wood (UK) Ltd | Wholesale & retail | 2017 |
| Cubotic Ltd | Real estate | 2021 |
| Cuffley Silver Limited | Real estate | 2025 |
| CUK Properties Ltd | Real estate | 2016 |
| Cumberland Gardens Freehold Limited | Real estate | 2000 |
| Cumberland Gardens Property Management Co. Limited | Real estate | 1967 |
| Cura Partners Ltd | Administrative & support | 2026 |
| Cura Vita Limited | Wholesale & retail | 2026 |
| Curate Space Limited | Other services | 2025 |
| Cure Bytes AI Ltd | Information & communication | 2025 |
| Curea Construction Ltd | Construction | 2025 |
| Curiousiq Limited | Information & communication | 2025 |
| Curtain Blinds 4 YOU Limited | Administrative & support | 2014 |
| Curtains Direct (UK) Limited | Wholesale & retail | 1999 |
| Curtains, Blinds & Shutters Ltd | Wholesale & retail | 2021 |
| Curzon & Webb Ltd | Professional & scientific | 2009 |
| Cushions (UK) Limited | Manufacturing | 2001 |
| Custom Apparel Ltd | Wholesale & retail | 2024 |
| Customized Financial Solutions Limited | Professional & scientific | 2023 |
| CUT and Bent Limited | Wholesale & retail | 2024 |
| CVS Cars Ltd | Wholesale & retail | 2020 |
| CVS Tutoring Limited | Education | 2015 |
| Cwdm Enterprises Ltd | Professional & scientific | 2025 |
| Cwpm Consulting Ltd | Professional & scientific | 2016 |
| Cybanatics Limited | Information & communication | 2021 |
| Cyber Graph Consultancy Limited | Information & communication | 2015 |
| Cybermind Marketing UK Ltd | Information & communication | 2024 |