| Chicken Valley Waterloo Ltd | Hospitality | 2018 |
| Chikodoo Limited | Agriculture & fishing | 2020 |
| Chills Ventures Limited | Real estate | 2025 |
| Chimney Investments Ltd | Real estate | 2020 |
| China Britain Business Resources Limited | Wholesale & retail | 2016 |
| China Style Cake Ltd | Manufacturing | 2023 |
| China Sun Ltd | Health & social care | 2024 |
| Chinook Apparel UK Limited | Wholesale & retail | 2019 |
| Chiropractic Consultant Limited | Health & social care | 2013 |
| Chivelour Ltd | Wholesale & retail | 2025 |
| Chloe Drury Limited | Health & social care | 2013 |
| CHM Building Services Ltd | Construction | 2013 |
| Chocolate Ice Cafe (UK) Limited | Hospitality | 2014 |
| Choice Care Group (Surrey) Limited | Health & social care | 2016 |
| Choiceforce Limited | Construction | 1997 |
| Chois Tours Limited | Administrative & support | 2015 |
| Chokdee Signature Ltd | Hospitality | 2024 |
| Choose Croatia Ltd | Extraterritorial | 2020 |
| Chopra Limited | Wholesale & retail | 2021 |
| Chopsticks Ltd | Hospitality | 2021 |
| Chosko FIX Ltd | Construction | 2016 |
| Choudry DRY Cleaning Ltd | Other services | 2022 |
| Chris & R Ltd | Construction | 2016 |
| Chris Crust Kitchen Limited | Hospitality | 2026 |
| Chris R Robertson Ltd | Administrative & support | 2017 |
| Chrised Limited | Health & social care | 2022 |
| Chriss 75 Ltd | Construction | 2017 |
| Christchurch House Freehold Company Limited | Real estate | 2021 |
| Christine Waldengren Limited | Professional & scientific | 2007 |
| Christofi Investments Ltd | Administrative & support | 2013 |
| Christopher Winston Gordon Ltd | Financial services | 2024 |
| Chrono Corner Ltd | Wholesale & retail | 2024 |
| Chronograph Limited | Health & social care | 2012 |
| Chrysalis Partners Consultancy Ltd | Professional & scientific | 2020 |
| Church Hill Property Solutions Ltd | Construction | 2014 |
| Churchill Electrical Solutions Ltd | Construction | 2022 |
| Churchill Investments (UK) Limited | Real estate | 1994 |
| Churchill Residential Care and Nursing Homes Limited | Health & social care | 1995 |
| Cicce Estate Ltd | Households | 2018 |
| Cicce Homes Ltd | Households | 2018 |
| Cicce Properties Ltd | Real estate | 2022 |
| Cicero League of International Lawyers | Other services | 2013 |
| Cilos UK Services Ltd | Other services | 2025 |
| Cimetrics Ltd | Construction | 2014 |
| Cinetrail Limited | Information & communication | 2025 |
| Cipher Homes Limited | Real estate | 2017 |
| Cipher Testing Limited | Information & communication | 2007 |
| Cipherweaver Ltd | Information & communication | 2026 |
| Circa Property Services Ltd | Construction | 2020 |
| Circle-Z Limited | Professional & scientific | 2020 |
| Circular Investments Limited | Financial services | 2025 |
| Circularising (Southern) Limited | Manufacturing | 2021 |
| Circus Pictures Film Limited | Information & communication | 2016 |
| Circuthon Consulting Ltd | Professional & scientific | 2020 |
| Cirrus Accountants Limited | Professional & scientific | 2020 |
| Citiplace Limited | Extraterritorial | 2001 |
| Citrus Prime Ltd | Information & communication | 2024 |
| City Cleaners Ltd | Administrative & support | 2018 |
| City Connection Limited | Transport & logistics | 2020 |
| City Trading London Ltd | Other services | 2015 |
| City Valuation Advisory Limited | Professional & scientific | 2015 |
| Citymassage Ltd | Health & social care | 2018 |
| Civic Build Solutions Ltd | Construction | 2025 |
| CJ Digital Solutions Ltd | Administrative & support | 2017 |
| CJ Plumbing (London) Limited | Construction | 2019 |
| CJJ Limited | Professional & scientific | 2015 |
| CJK 1 Ltd | Hospitality | 2017 |
| CJK Auto Lease Ltd | Administrative & support | 2019 |
| CJP Accountancy Limited | Administrative & support | 2011 |
| CJS Electrical Solutions Limited | Construction | 2017 |
| CJS Roofing & Building Limited | Construction | 2025 |
| Cktl Investments Ltd | Real estate | 2026 |
| Claisse Property Ltd | Real estate | 2018 |
| Clami Investments Holding Ltd | Other services | 2019 |
| Clapham Common Ltd | Professional & scientific | 2020 |
| Clarbow Services Limited | Administrative & support | 2010 |
| Clare Investments Limited | Professional & scientific | 2022 |
| Clare Real Estate Limited | Real estate | 2022 |
| Clarence Loft & Extensions Ltd | Construction | 2025 |
| Clarity Hair & Beauty Ltd | Other services | 2014 |
| Clark Decorating and Property Maintenance Ltd | Construction | 2021 |
| Clarkes Jewellers Limited | Wholesale & retail | 2012 |
| Clarkson Hyde Company Secretaries Ltd | Administrative & support | 2002 |
| Clarkson Hyde Global Limited | Administrative & support | 2005 |
| Clarkson Hyde LLP | | 2007 |
| Clash Commerce Ltd | Wholesale & retail | 2025 |
| Classbrick Limited | Wholesale & retail | 2025 |
| Classic News Limited | Real estate | 2002 |
| Classic Suits Limited | Wholesale & retail | 2023 |
| Classico Pizza Ltd | Hospitality | 2026 |
| Claughton Building Ltd | Construction | 2016 |
| Claygate Property Solutions Ltd | Construction | 2015 |
| CLC Aesthetic Marketing Ltd | Professional & scientific | 2026 |
| Clean Air Conditioning Installation Limited | Energy | 2017 |
| Clean Drycleaners Ltd | Other services | 2025 |
| Cleanday London Ltd | Administrative & support | 2013 |
| Cleanfox Ltd | Administrative & support | 2026 |
| Cleaning Gurus Agency Ltd | Administrative & support | 2023 |
| Cleaning Gurus Commercial Ltd | Administrative & support | 2019 |
| Cleaning Gurus Limited | Wholesale & retail | 2008 |