| Chocolate Boulevard Limited | Hospitality | 2017 |
| Chocolicious London Ltd | Wholesale & retail | 2024 |
| Choice Performance Ltd | Arts & recreation | 2018 |
| Chopra & Sons Property Limited | Real estate | 2021 |
| Chort Limited | Professional & scientific | 2012 |
| Choudhry Trading Limited | Wholesale & retail | 2013 |
| Chowz Ltd | Hospitality | 2026 |
| Chpl Holding Limited | Professional & scientific | 2026 |
| Chris Coulson Ltd | Transport & logistics | 2026 |
| Chris Dart Limited | Information & communication | 2013 |
| Chris Rambridge Creative Limited | Professional & scientific | 2014 |
| Christian Patis Limited | Real estate | 1976 |
| Christians&Concepts Ltd | Wholesale & retail | 2016 |
| Christyle Support Services Ltd | Health & social care | 2022 |
| Chrome Connections Ltd | Construction | 2015 |
| Chrome Real Estate Limited | Real estate | 2024 |
| Chromeandcoat Limited | Wholesale & retail | 2025 |
| Chronax Ltd | Wholesale & retail | 2019 |
| Chronbridge Technologies Limited | Information & communication | 2022 |
| Chrysalis Dental Practice Ltd | Health & social care | 2010 |
| Chrysalis JM Properties Limited | Construction | 2018 |
| Chrysalis MK Properties Limited | Construction | 2014 |
| Chrysalis RM Properties Limited | Construction | 2020 |
| Chrystal Care Services Limited | Health & social care | 2023 |
| Chuffed Solutions Limited | Information & communication | 2021 |
| Chuggington Productions Limited | Information & communication | 2019 |
| Chunga Limited | Households | 2016 |
| Church ELM Motors Limited | Wholesale & retail | 2024 |
| Church's Windows (Sales Division) Limited | | 1984 |
| Churchill Engineering Limited | Manufacturing | 2009 |
| Churchview Homes Ltd | Construction | 2021 |
| Churton Commercial Properties Limited | Real estate | 2014 |
| Cibarium Limited | Hospitality | 2019 |
| Cicek Legal Limited | Professional & scientific | 2022 |
| Cicinelli Coaching Ltd | Professional & scientific | 2026 |
| Cider Limited | Real estate | 2003 |
| Ciltrin Limited | Professional & scientific | 2025 |
| Cima Development Limited | Administrative & support | 2011 |
| Cincera Productions Limited | Administrative & support | 2014 |
| Ciobanu Construction Ltd | Construction | 2026 |
| Circleline Design Studio Limited | Other services | 2012 |
| Cissbury Travels Ltd | Transport & logistics | 2024 |
| Citiguard Services Ltd | Administrative & support | 2021 |
| Citilink Properties Ltd | Real estate | 2024 |
| Citrinava Ltd | Manufacturing | 2019 |
| City & South Eastern Developments Limited | Real estate | 1963 |
| City Barbers Canons Park Ltd | Other services | 2025 |
| City Centre Property Developments Limited | Construction | 2016 |
| City Gift Limited | Wholesale & retail | 2024 |
| City Renewables Ltd | Energy | 2011 |
| City Rice & Fish Ltd | Hospitality | 2025 |
| City.Deco Limited | Construction | 2019 |
| Citywall Investments Limited | Real estate | 2014 |
| Citywall Properties Ltd | Real estate | 2013 |
| Civic Works Limited | Professional & scientific | 2008 |
| CJ Adams Pebbledashing Limited | Construction | 2014 |
| CJB Events Limited | Wholesale & retail | 2025 |
| Cjlmr Ltd | Administrative & support | 2026 |
| CKA Driving School Ltd | Education | 2026 |
| CKD Management Limited | Households | 2025 |
| Claisuns Services Ltd | Information & communication | 2019 |
| Clancey Property Services Ltd | Construction | 2019 |
| Clapper Consulting Limited | Professional & scientific | 2009 |
| Clare Mackie Limited | Information & communication | 2013 |
| Clarendon James Investments Limited | Financial services | 2021 |
| Clarke Heating Limited | Construction | 2014 |
| Class Joinery Ltd | Construction | 2009 |
| Class & Style Ltd | Other services | 2025 |
| Class Supermarket Ltd | Wholesale & retail | 2016 |
| Classic Inn Limited | Real estate | 2011 |
| Classique Flowers Limited | Wholesale & retail | 2023 |
| Claygate House Limited | Construction | 2019 |
| Clean Hub Solutions Ltd | Administrative & support | 2025 |
| Clean&Errands Limited | Administrative & support | 2025 |
| Cleaning Zone Ltd | Administrative & support | 2025 |
| Cleanpro Ltd | Administrative & support | 2026 |
| Clear Choice Cleaners Ltd | Administrative & support | 2023 |
| Clear Food Solutions Limited | Hospitality | 2016 |
| Clearhaven Enterprises Limited | Professional & scientific | 2022 |
| Clearview Accounting (CVA) Limited | Professional & scientific | 2025 |
| Clementine Porritt Limited | Real estate | 2003 |
| Cleo Cleaning Services Ltd | Administrative & support | 2025 |
| Clever Cleaning Services Ltd | Administrative & support | 2023 |
| Cliff Face Limited | Professional & scientific | 2025 |
| Clifford Packaging Limited | Administrative & support | 2011 |
| Climatecroft Services Ltd | Construction | 2025 |
| Clinical Hearing Ltd | Health & social care | 2020 |
| Clinically Connected Limited | Professional & scientific | 2014 |
| Close Quarter Productions Ltd | Extraterritorial | 2006 |
| Cloud XLR8R Ltd | Information & communication | 2020 |
| CLOUD7 Delights Ltd | Hospitality | 2025 |
| CLOUD7 HQ Limited | Hospitality | 2023 |
| Cloudaws Limited | Information & communication | 2024 |
| Cloudfocusuk Ltd | Information & communication | 2019 |
| Cloudlike Studio Ltd | Arts & recreation | 2021 |
| Cloudt Consulting Limited | Information & communication | 2016 |
| Cloudy Studios Ltd | Information & communication | 2023 |
| Club Saha Ltd | Hospitality | 2025 |
| Clutsch Limited | Financial services | 2015 |
| Clyde Advisory Services Ltd | Professional & scientific | 2025 |