| Caprica Associates Ltd | Financial services | 2019 |
| Caprica Development Ltd | Construction | 2024 |
| Caprica Group Ltd | Financial services | 2025 |
| Caprica Investments Ltd | Arts & recreation | 2017 |
| Capstone Bridge Solutions Ltd | Information & communication | 2011 |
| Carbis Security Limited | Construction | 2001 |
| Card and Crystal Ltd | Administrative & support | 2024 |
| Cardiac Intervention Limited | Health & social care | 2010 |
| Cardstar Limited | Wholesale & retail | 1979 |
| Care Changes Lives Ltd | Health & social care | 2026 |
| Care Market Research Ltd | Professional & scientific | 2023 |
| Care Plus Innovation Limited | Information & communication | 2015 |
| Careaudits Limited | Information & communication | 2019 |
| Caregiveshare Ltd | Health & social care | 2023 |
| Caretek Medical Ltd | Information & communication | 2016 |
| Carew Lodge Residents Association Limited | Real estate | 1990 |
| Carlos Font Ltd | Professional & scientific | 2018 |
| Carlton Phoenix Limited | Real estate | 2020 |
| Carmen Cracknell Ltd | Professional & scientific | 2021 |
| Carosie Limited | Professional & scientific | 2026 |
| Carrington Services Limited | Real estate | 1994 |
| Carter (2005) Property Limited | Real estate | 2017 |
| Carter Chemist (2005) Limited | Wholesale & retail | 2005 |
| Cartref House Management Company Limited | Households | 1985 |
| Casafortis Ltd | Real estate | 2005 |
| Casamap Ltd | Information & communication | 2025 |
| Cascade Admin Ltd | Professional & scientific | 2016 |
| Cascade Ventures Ltd | Wholesale & retail | 2025 |
| Caseflight Limited | Hospitality | 2005 |
| Cass Thermal Supplies Limited | Construction | 2005 |
| Cassini Sound Ltd | Professional & scientific | 2015 |
| Catalyst Health Economics Consultants Limited | Professional & scientific | 2018 |
| Catena (Nottingham) Limited | Professional & scientific | 2012 |
| Cathedral Consulting Limited | Information & communication | 2003 |
| Cavendish Radiology Limited | Health & social care | 2021 |
| Cavrad Investment Limited | Real estate | 2026 |
| Cbtc Signalling Consultants Ltd | Administrative & support | 2018 |
| CD Ventures Limited | Administrative & support | 2012 |
| CDS Investments Ltd | Real estate | 2017 |
| CDS Plumbing Ltd | Construction | 2021 |
| Cedar Grange (Ducks Hill) Management Company Limited | Professional & scientific | 2000 |
| Cedar Grange Freehold Limited | Households | 2007 |
| Ceemaf Constructions Ltd | Construction | 2022 |
| Ceetee Designs Limited | Hospitality | 2019 |
| Celestine Properties Ltd | Real estate | 2017 |
| Censor Limited | Information & communication | 2014 |
| Century Technology Ventures Ltd | Professional & scientific | 2019 |
| CEO Coaching Ltd | Administrative & support | 2014 |
| Cephtactics Limited | Administrative & support | 2015 |
| Ceylon Ltd | Wholesale & retail | 2016 |
| CGL Installations Ltd | Construction | 2010 |
| CH Formations Ltd | Other services | 2013 |
| CHA CHA Chai Northwood Ltd | Hospitality | 2023 |
| Chain Bridge Estates LLP | | 2019 |
| Chaitanya Homeopathy Limited | Health & social care | 2025 |
| Chalet Hill Dental Ltd | Health & social care | 2017 |
| Chandok Gold Properties Limited | Real estate | 2003 |
| Change Ahead CIC | Health & social care | 2025 |
| Chantry Management Company Limited | Households | 1994 |
| Charard Limited | Extraterritorial | 2008 |
| Charmi Creations Ltd | Manufacturing | 2010 |
| Charuh Ruslan Investments Co. Ltd | Financial services | 2014 |
| Charville Lane (Hayes) Management Limited | Construction | 2017 |
| Chasewood Developments Limited | Construction | 2003 |
| Chat Solutions Ltd | Professional & scientific | 2016 |
| Chatsal Ltd | Real estate | 2026 |
| Chatwell Ltd | Hospitality | 2018 |
| Cheam Residential Limited | Construction | 2022 |
| Cheap Container Storage Ltd | Transport & logistics | 2023 |
| Cheeky Van Limited | Hospitality | 2014 |
| Chemove Limited | Manufacturing | 2001 |
| Chenies Northwood Limited | Professional & scientific | 2003 |
| Chenies Residents Association Limited | Households | 2002 |
| Cherry Blossom Gate Holdings Ltd | Real estate | 2022 |
| Chesham Court Management Limited | Households | 2012 |
| Chess International Ltd | Professional & scientific | 2015 |
| CHESTERHOUSEW1W Ltd | Real estate | 2022 |
| Chez Conseil Capital Ltd | Professional & scientific | 2021 |
| Chic Consultancy & Design Limited | Professional & scientific | 2015 |
| Chick and EGG Limited | Real estate | 2026 |
| Chickenandslice Ltd | Hospitality | 2026 |
| Chillu Property Holdings Ltd | Households | 2019 |
| Chiltern Lettings Limited | Real estate | 2010 |
| China Garden Catering Ltd | Hospitality | 2015 |
| Chiniekka Holding Limited | Financial services | 2021 |
| Chobham Estates Limited | Real estate | 2012 |
| Chorex Consultants Limited | Professional & scientific | 2014 |
| Chorleywood Dental Practice Ltd | Health & social care | 2020 |
| Chowdry Investments Ltd | Real estate | 2023 |
| Church Road Car Park Management Co Limited | Households | 2019 |
| Churchills Lsdm Ltd | Real estate | 2022 |
| Chuzico Ltd | Wholesale & retail | 2025 |
| Cimo Consulting Limited | Professional & scientific | 2022 |
| Cinq Bleu Limited | Professional & scientific | 2025 |
| Circularthreadsproject Ltd | Professional & scientific | 2020 |
| Citibus Limited | Transport & logistics | 2013 |
| Citicore Investments Limited | Real estate | 1997 |
| Citrine & Sage Limited | Real estate | 2024 |
| Citrix IT Solutions Limited | Information & communication | 2022 |
| Citrix Property Management Limited | Real estate | 2019 |