| Chasdei Aharon Limited | Administrative & support | 2011 |
| Chasdei Esther | Public administration | 2017 |
| Chatdeck Limited | Information & communication | 2020 |
| Chauffeur Executive Ltd | Other services | 2015 |
| Cheek Ltd. | Manufacturing | 2012 |
| Cheer Quest Ltd | Wholesale & retail | 2018 |
| Chef GC Limited | Hospitality | 2019 |
| Chelmer Fine Art Limited | Extraterritorial | 2002 |
| Chemglassware Manufacturers Limited | Administrative & support | 1972 |
| Cheshunt Wimpy Ltd | Hospitality | 2017 |
| Chew Productions Limited | Information & communication | 2023 |
| Cheyne Court Flats Limited | Households | 1971 |
| CHH Property Investments Limited | Financial services | 2021 |
| CHI Nine Ltd | Wholesale & retail | 2021 |
| Chicclique Ltd | Wholesale & retail | 2025 |
| Chickeez Limited | Hospitality | 2025 |
| Chiem Global Services Ltd | Transport & logistics | 2022 |
| Chigwell Cars Trader Ltd | Wholesale & retail | 2025 |
| Chigwell Consultancy Limited | Information & communication | 2020 |
| Chigwell Estates Limited | Real estate | 2021 |
| Chigwell Foods Limited | Hospitality | 2025 |
| Chigwell Plumbers Ltd | Construction | 2006 |
| Chigwell Property Maintenance Solutions Ltd | Administrative & support | 2025 |
| Chigwell Services Ltd | Information & communication | 2020 |
| Chimes Garden Village Ltd | Construction | 2026 |
| China Properties Ltd | Financial services | 2012 |
| China Trade House Limited | Wholesale & retail | 2026 |
| Chinese Learning Centre Ltd | Education | 2011 |
| Chinese Tuition Centre Ltd | Education | 2015 |
| Chingford Gates Ltd | Construction | 2025 |
| Chingford Mount Funeral Directors Limited | Other services | 2005 |
| Chingford Plumbing & Heating Limited | Construction | 2014 |
| Chinghill Ltd | Real estate | 2006 |
| Chipped Entertainment Ltd | Arts & recreation | 2017 |
| Chisel and Vice Ltd | Other services | 2014 |
| Chjonescoaching Limited | Arts & recreation | 2025 |
| Chohan Catering Limited | Hospitality | 2025 |
| CHOICEUK247 Limited | Wholesale & retail | 2017 |
| Cholcroft Limited | Wholesale & retail | 1977 |
| Choray Commercial Limited | Wholesale & retail | 2020 |
| Chris KAY Consultants Limited | Professional & scientific | 2009 |
| Chris Willis Design Ltd | Professional & scientific | 2022 |
| Chris-Aneebas Ltd | Education | 2019 |
| Chrisfix Ltd | Construction | 2016 |
| Chrisp Street & Co Limited | Construction | 2018 |
| Christ Restoration Ministries CIC | Health & social care | 2024 |
| Christopher Butler Limited | Financial services | 2013 |
| Christopher Fitch Associates Ltd | Information & communication | 2016 |
| Chrome Contracting Ltd | Construction | 2018 |
| Chrome Square Developments Limited | Construction | 2013 |
| Chronic Fonk Ltd | Administrative & support | 2014 |
| Chronic Love CIC | Information & communication | 2024 |
| Chronograph Finance Limited | Professional & scientific | 2003 |
| Church's Residential Ltd | Real estate | 2019 |
| Churchill Woodford Limited | Hospitality | 2019 |
| Churchills Castle Ltd | Hospitality | 2024 |
| Churchills Fish & Chips Ltd | Hospitality | 2024 |
| Ciechan Holdings Ltd | Real estate | 2019 |
| Cinnamon Cleaning Company Ltd | Administrative & support | 2017 |
| Cino Investments Limited | Real estate | 2022 |
| CIR Consulting Ltd. | Administrative & support | 2020 |
| Circ Design and Build Ltd | Construction | 2018 |
| Circa Residential Property Limited | Administrative & support | 2000 |
| Cireon Limited | Information & communication | 2025 |
| Cirq Hiit Limited | Other services | 2022 |
| Cirque DU SO GAY Limited | Administrative & support | 2020 |
| Cities of Gold Limited | Administrative & support | 2009 |
| City Copy Centre Limited | Manufacturing | 1994 |
| City Executive Consultants Holdings Ltd | Financial services | 2023 |
| City Executive Consultants Limited | Administrative & support | 1994 |
| City Serviced Living Limited | Administrative & support | 2021 |
| City View Estates (London) Limited | Real estate | 1999 |
| Cityscape Property Developments Ltd | Real estate | 2018 |
| Civil Service Flying Club (Biggin Hill) Limited | Arts & recreation | 1979 |
| CJ Webb Property Limited | Real estate | 2017 |
| CJS Barbers Ltd | Administrative & support | 2026 |
| CKP Decorating Services Ltd | Construction | 2025 |
| CKW Building Solutions Ltd | Construction | 2014 |
| CL Construction Group Ltd | Construction | 2026 |
| CL GAS Services Ltd | Construction | 2014 |
| Claire Marshall Property Services Limited | Real estate | 2022 |
| Clarice Elise Limited | Real estate | 2003 |
| Clarigem Limited | Administrative & support | 2020 |
| Clarity Pro AV Limited | Information & communication | 2025 |
| Clark White Publications Limited | Information & communication | 1991 |
| Classic Designs Limited | Administrative & support | 2020 |
| Classic Designs Perfect Art Limited | Administrative & support | 2022 |
| Clay & Bean Ltd | Hospitality | 2024 |
| Clay Shots Limited | Arts & recreation | 2014 |
| Claybrook Medical Services Limited | Health & social care | 2017 |
| Claybury Hall Freehold Limited | Real estate | 2010 |
| Clayhall Financial Services Limited | Financial services | 2002 |
| Clayton Investments Ltd | Real estate | 2018 |
| Clean East LDN Ltd | Administrative & support | 2016 |
| Cleaning Tribe Ltd | Administrative & support | 2024 |
| Clear Book Accountants Ltd | Professional & scientific | 2019 |
| Clear IT Waste Services Ltd | Water & waste | 2019 |
| Clear PAY Ltd | Administrative & support | 2023 |
| Clear Secretarial Services Ltd | Administrative & support | 2019 |
| Clearfair Limited | Real estate | 1997 |