| Castle Wellss Limited | Information & communication | 2023 |
| CASTLE786 Food Limited | Other services | 2022 |
| Castlebricks Development Limited | Construction | 2018 |
| Castly Ltd | Information & communication | 2025 |
| Cat Grooming School Limited | Education | 2012 |
| Cat Investment Capital Ltd | Real estate | 2018 |
| Cat Plumbing Ltd | Construction | 2017 |
| Catalyst BDM Limited | Professional & scientific | 2014 |
| Catalyst Crew Limited | Professional & scientific | 2025 |
| Catalytic Contracting Limited | Other services | 2014 |
| Catch the Builders Ltd | Construction | 2025 |
| Cateriyah Limited | Health & social care | 2026 |
| Cathena Healthcare Limited | Health & social care | 2008 |
| Catherham Lodge Limited | Health & social care | 2023 |
| Catherine School of London Limited | Education | 2025 |
| Cati Transport Ltd | Transport & logistics | 2018 |
| Catichify Ltd | Wholesale & retail | 2025 |
| Catriona and Evergreen Trading Ltd | Wholesale & retail | 2019 |
| Catval Ltd | Administrative & support | 2022 |
| Cava Guard SW London Limited | Administrative & support | 2013 |
| Cavendish Eco Ltd | Construction | 2025 |
| Cavendish London Limited | Information & communication | 2022 |
| Cavendish Portman Ltd. | Real estate | 2013 |
| Cavendish Trading Ltd | Real estate | 2020 |
| Caviale Ltd | Wholesale & retail | 2022 |
| Cavoli Trading Ltd | Wholesale & retail | 2021 |
| Cbce Consultancy Ltd | Construction | 2019 |
| CBI Logistics Ltd | Transport & logistics | 2019 |
| CBM Accounting Ltd | Professional & scientific | 2010 |
| CBT Services Ltd | Transport & logistics | 2025 |
| CC & Cole Developments Ltd | Real estate | 2017 |
| CC Equatorial Ltd | Wholesale & retail | 2022 |
| Ccak Holdings Limited | Administrative & support | 2024 |
| CCG SPV 03 Limited | Real estate | 2019 |
| CCG SPV 04 Limited | Real estate | 2020 |
| CCG SPV 05 Limited | Real estate | 2020 |
| CCG SPV 06 Limited | Real estate | 2020 |
| CCG SPV 07 Limited | Real estate | 2020 |
| Ccgf Ltd | Wholesale & retail | 2023 |
| CCM Construction Ltd | Construction | 2025 |
| Cctv Giant Ltd | Wholesale & retail | 2023 |
| Cctv Wise Ltd | Administrative & support | 2023 |
| CD Morgan Consultants Ltd | Information & communication | 2016 |
| CD Socials Ltd | Professional & scientific | 2022 |
| CDA Interiors Limited | Construction | 2019 |
| Cdbx Ltd | Construction | 2026 |
| CDC Group Ltd | Extraterritorial | 2023 |
| CDC Property Developments Ltd | Real estate | 2022 |
| CDC Property Management Ltd | Real estate | 2023 |
| CDC Waste Management Ltd | Water & waste | 2023 |
| Cdct Ltd | Education | 2022 |
| Cdesan Limited | Hospitality | 2024 |
| Cdfa Ltd | Information & communication | 2021 |
| CDM Design Services Ltd | Professional & scientific | 2018 |
| CDN International Ltd | Other services | 2025 |
| CE CAB Services Ltd | Transport & logistics | 2026 |
| Cean Systems Ltd | Information & communication | 2025 |
| Ceccun Limited | Information & communication | 2026 |
| Cece Sportswear Limited | Wholesale & retail | 2014 |
| Cecilia Broker Services Limited | Financial services | 2023 |
| Cedana Investments Ltd | Real estate | 2025 |
| Cedar Consultancy 247 Limited | Health & social care | 2025 |
| Cedar Hotel Limited | Hospitality | 2004 |
| Cedar Oasis Consultancy Ltd | Professional & scientific | 2023 |
| Cedar Rutts Properties Limited | Real estate | 2014 |
| Cedars Construction Solutions Ltd | Real estate | 2022 |
| Cedrus Supplies Limited | Wholesale & retail | 2020 |
| Cekd Limited | Real estate | 2022 |
| CEL Consultants Ltd | Professional & scientific | 2013 |
| Celebration Cakes Ltd | Wholesale & retail | 2021 |
| Celebrations Global Limited | Other services | 2007 |
| Celesta Entertainment Ltd | Administrative & support | 2024 |
| Celestial Leather Limited | Wholesale & retail | 2024 |
| Celestial Trading Limited | Wholesale & retail | 2021 |
| Cell Spot 786 Ltd | Wholesale & retail | 2023 |
| Cell Story Ltd | Wholesale & retail | 2024 |
| Cell Xchange Limited | Wholesale & retail | 2025 |
| Cellentric Ltd | Wholesale & retail | 2022 |
| Cellsonic (UK) Limited | Wholesale & retail | 2000 |
| Cellutron Limited | Wholesale & retail | 2026 |
| Celphy Ltd | Wholesale & retail | 2018 |
| Celvora Elan Limited | Wholesale & retail | 2025 |
| Ceme Consultancy Services Ltd | Other services | 2022 |
| Ceme Foood Ltd | Other services | 2022 |
| Ceme Traders Ltd | Other services | 2022 |
| CEN Business and Training Services Ltd | Professional & scientific | 2010 |
| Centasys Ltd | Information & communication | 2014 |
| Centaurus Estates Ltd | Construction | 2016 |
| Center for Natural Science & Engineering Research Limited | Professional & scientific | 2024 |
| Center of Integration in Learning and Teaching (Cilt) Limited | Education | 2021 |
| Central City Plumbers Limited | Construction | 2025 |
| Central Cleaning London Ltd | Administrative & support | 2021 |
| Central Glass Designs Ltd | Construction | 2022 |
| Central Kitchen Ltd | Hospitality | 2019 |
| Central Media Services Limited | Professional & scientific | 2005 |
| Central Tech Ltd | Administrative & support | 2010 |
| Centralized UK Ltd | Information & communication | 2018 |
| Centrals Automotive Ltd | Wholesale & retail | 2026 |
| Centre for Bangladesh Research & Youth Development - Cbryd Ltd | Professional & scientific | 2025 |
| Centre for British Bangladeshis (Cfbb) | Other services | 2020 |