| China Rose 254 Limited | Hospitality | 2024 |
| Chloe's & Sophie's Special Ears Fund | Health & social care | 2012 |
| Chopan Grill Limited | Hospitality | 2026 |
| CHP Property Holdings Ltd | Real estate | 2025 |
| Chrimi UK Limited | Wholesale & retail | 2025 |
| Christmas Bakery Holdings Limited | Professional & scientific | 2020 |
| Christmas Bakery Limited | Manufacturing | 2015 |
| Church Lane Groundworks & Landscaping Ltd | Administrative & support | 2017 |
| Church Lane Management Ltd | Administrative & support | 2013 |
| Churchill Interior Finishing Limited | Professional & scientific | 1998 |
| Churchwell Tree Services Limited | Agriculture & fishing | 2007 |
| Cirrus Event Management Limited | Administrative & support | 1996 |
| Citipharm Ltd | Other services | 2019 |
| City Construction & Development Ltd | Construction | 2015 |
| City Store PVT Ltd | Wholesale & retail | 2013 |
| Civx Group Ltd | Construction | 2025 |
| CJM HR Services Ltd | Administrative & support | 2018 |
| CJM Industries Ltd | Wholesale & retail | 2022 |
| Clare & Company (Farnborough) Limited | Construction | 2009 |
| Claremont Structures Limited | Financial services | 2022 |
| Claremont Taxis Limited | Information & communication | 2003 |
| Classic & Vintage Wedding Cars Ltd | Transport & logistics | 2016 |
| Clean and Shiny (UK) Limited | Manufacturing | 2013 |
| Clean Andmm Ltd | Administrative & support | 2024 |
| Clean Drive London Ltd | Wholesale & retail | 2026 |
| Cleaner's Club Ltd | Administrative & support | 2026 |
| Cleaning Industry Supplies Ltd | Administrative & support | 2025 |
| Clearex Services Limited | Administrative & support | 2026 |
| Clemsalphanso Afro Carribean Ltd | Wholesale & retail | 2024 |
| Cleveland Auto & Marine Limited | Arts & recreation | 1999 |
| Client Rush Ltd | Professional & scientific | 2024 |
| Climate Advice Limited | Professional & scientific | 2026 |
| Clinix Transport Solutions Ltd | Water & waste | 2025 |
| Cloud Comms Ltd | Education | 2023 |
| Cloud ETC Ltd | Information & communication | 2018 |
| Clouding AI Limited | Information & communication | 2026 |
| Clustriq Limited | Information & communication | 2026 |
| CM Chiro Limited | Health & social care | 2025 |
| CM Properties Solutions Ltd | Construction | 2026 |
| Cmafa Limited | Real estate | 2020 |
| CMS Courier Services Ltd | Transport & logistics | 2019 |
| Coaching Networks Limited | Education | 2018 |
| Coachpoint Ltd | Transport & logistics | 2016 |
| Cobb Investments Ltd | Administrative & support | 2016 |
| Coco Tihm Ltd | Real estate | 2025 |
| Coddan Business Support Services Ltd | Administrative & support | 2021 |
| Coffee Enterprises Limited | Hospitality | 2025 |
| Coffeeparadise Ltd | Wholesale & retail | 2025 |
| COG International Limited | Agriculture & fishing | 1999 |
| Coleman Court Management Company Limited | Real estate | 2013 |
| Collina Rental Property Ltd | Real estate | 2024 |
| Coltonsbuys Ltd | Extraterritorial | 2022 |
| Common Wealth Beauty Council Limited | Professional & scientific | 2025 |
| Community Grub Hub CIC | Hospitality | 2021 |
| Compass Coaching & Yoga Limited | Professional & scientific | 2023 |
| Complete Classics Limited | Information & communication | 2022 |
| Comprehensive Hygienist Ltd | Health & social care | 2022 |
| Compuforce Ltd | Information & communication | 2004 |
| Comquest Technology Limited | Information & communication | 2024 |
| Conasons Ltd | Construction | 2017 |
| Concept Design Solutions ( Surrey ) Ltd | Construction | 2008 |
| Confian Recruitment Limited | Administrative & support | 2019 |
| Connect Marketing Limited | Information & communication | 2016 |
| Connecting Life Ltd | Health & social care | 2018 |
| Conscious Career Ltd | Other services | 2018 |
| Conse Catering Services Limited | Hospitality | 2025 |
| Contact Front Security Ltd | Administrative & support | 2019 |
| Contractors a 2 Z Limited | Construction | 2025 |
| Convenience Ventures Ltd | Wholesale & retail | 2025 |
| Cookman Brothers Limited | Administrative & support | 2012 |
| Coote & Co Developments Ltd | Construction | 2025 |
| Corewire Limited | Manufacturing | 1975 |
| Corinne Bracken Equestrian Limited | Education | 2009 |
| Corkademy Limited | Manufacturing | 2022 |
| Corner Store Aldershot Ltd | Wholesale & retail | 2020 |
| Corner to Corner Cleaning Ltd | Administrative & support | 2024 |
| Cost Confidence Ltd | Professional & scientific | 2019 |
| Costlook Company Limited | Energy | 1993 |
| Cosy Ghar Interior Ltd | Professional & scientific | 2024 |
| Counting Miles Limited | Wholesale & retail | 2019 |
| Courier Tree UK Ltd | Transport & logistics | 2025 |
| Cove Construction Limited | Construction | 1973 |
| Cove Road Management Limited | Real estate | 2023 |
| CP Peja Ltd | Real estate | 2025 |
| CPD for YOU Limited | Education | 2025 |
| CPV Ltd | Manufacturing | 1949 |
| Crab 98 Ltd | Hospitality | 2023 |
| Crafts TOO Limited | Wholesale & retail | 2003 |
| Crank Prints Limited | Manufacturing | 2023 |
| Crawford Management Services LLP | | 2017 |
| Crawford Real Estate Ltd | Real estate | 2026 |
| Creatine in a CAN Ltd | Manufacturing | 2025 |
| Creighton and Shaw Limited | Administrative & support | 2009 |
| Creme New Homes & Developments Ltd | Real estate | 2018 |
| Cresswell Property Management Limited | Households | 2020 |
| Crest Business Cars Limited | Transport & logistics | 2016 |
| Cricos Ltd | Construction | 2023 |
| Croceus Limited | Administrative & support | 2015 |
| Cromwell Chamber Ltd | Professional & scientific | 2024 |
| Crooksbury Auto Recycling Services Ltd | Wholesale & retail | 2013 |