| Chess Designs Limited | Administrative & support | 2000 |
| Chess Holdings Limited | Agriculture & fishing | 2024 |
| Chess Law Ltd | Professional & scientific | 2025 |
| Chess Valley Autos Ltd | Wholesale & retail | 2023 |
| Chess Valley Kitchen Limited | Manufacturing | 2021 |
| Chess Valley Limited | Professional & scientific | 2018 |
| Chess Valley Livestock Limited | Agriculture & fishing | 2012 |
| Chess Valley Signs Ltd | Real estate | 2022 |
| Chessmill Developments Ltd | Construction | 2019 |
| Chessvale Homes Ltd | Construction | 2017 |
| Chetwode Properties Ltd | Real estate | 2024 |
| CHF Ltd | Other services | 2025 |
| Chilly Hill Management Company Limited | Households | 1986 |
| Chiltern Auto Locksmiths Ltd | Wholesale & retail | 2026 |
| Chiltern Beat Records Limited | Information & communication | 2010 |
| Chiltern Building Surveyors Ltd | Professional & scientific | 2009 |
| Chiltern Carriage Company Limited | Transport & logistics | 2020 |
| Chiltern Christian Trust | Other services | 2004 |
| Chiltern Complete Construction Ltd | Construction | 2023 |
| Chiltern Court Developments Ltd | Construction | 2025 |
| Chiltern Domestic Appliances Ltd | Administrative & support | 2016 |
| Chiltern Engineering Limited | Other services | 2010 |
| Chiltern Forge Limited | Manufacturing | 2025 |
| Chiltern Futsal Ltd | Education | 2025 |
| Chiltern Global Limited | Manufacturing | 2005 |
| Chiltern Heritage Orchards Limited | Agriculture & fishing | 2026 |
| Chiltern Natural Therapies Limited | Health & social care | 2006 |
| Chiltern Plumbing and Heating Limited | Real estate | 1998 |
| Chiltern Projects Limited | Construction | 2023 |
| Chiltern Ridge Apple Juice Limited | Manufacturing | 2011 |
| Chiltern Safaris Limited | Administrative & support | 2025 |
| Chiltern Trades Limited | Professional & scientific | 2025 |
| Chiltern View Homes Limited | Construction | 2023 |
| Chiltern Voice C.I.C. | Information & communication | 2016 |
| Chiltern Youth Matters (Way in) | Education | 2005 |
| Chilterns Heritage & Archaeology Partnership Community Interest Company | Professional & scientific | 2026 |
| Chiltonian Property Ltd | Real estate | 2024 |
| Chiltren Investment Ltd | Real estate | 2019 |
| Chows Emporium Limited | Wholesale & retail | 2023 |
| Christopher Wood Estate Agent Limited | Real estate | 2020 |
| Chronicles of Chesham Ltd | Arts & recreation | 2026 |
| Church Cottage Investments Limited | Real estate | 1963 |
| Church View Funeral Services Limited | Other services | 2015 |
| Cibo Food & Drink Ltd | Hospitality | 2013 |
| Cincopiedras Ltd | Financial services | 2026 |
| Cine Bear Ltd | Information & communication | 2023 |
| Cior Ltd | Professional & scientific | 2021 |
| Ciprian Tarambaca Ltd | Construction | 2018 |
| Ciren Homes Ltd | Real estate | 2018 |
| Ciren Risk Management Ltd | Information & communication | 2019 |
| Cirrus Mining Innovation Limited | Information & communication | 2016 |
| CJH Clinical Consulting Limited | Administrative & support | 2009 |
| Clarity Bound Ltd | Professional & scientific | 2016 |
| Clarity Turnaround Limited | Professional & scientific | 2013 |
| Clarke's Engineering Contracting Ltd. | Manufacturing | 2014 |
| Claystone Capital Ltd | Real estate | 2024 |
| CLC Locums Ltd | Professional & scientific | 2010 |
| Cleapss Premises 2020 Limited | Education | 2019 |
| Clhc Limited | Hospitality | 2024 |
| Click a Motor (UK) Ltd | Wholesale & retail | 2016 |
| Click Two Ltd | Administrative & support | 2004 |
| Click Worldwide Couriers Limited | Transport & logistics | 2006 |
| Clinical Photopro Ltd | Manufacturing | 2019 |
| Clinivista Consulting Ltd | Professional & scientific | 2025 |
| Clint Images Limited | Professional & scientific | 2009 |
| CLM 2.0 Limited | Professional & scientific | 2019 |
| Clocktower Hospitality Ltd | Hospitality | 2023 |
| Cloudchest Limited | Information & communication | 2022 |
| CM Sculpture Ltd | Manufacturing | 2015 |
| CMG Audio Ltd. | Information & communication | 2013 |
| CNB Management Consultancy Limited | Professional & scientific | 2017 |
| Cocktailmaker Limited | Professional & scientific | 2009 |
| Coffee & Coach Limited | Hospitality | 2024 |
| Coffee With Benefits Limited | Professional & scientific | 2026 |
| Cogent Innovation Services Limited | Professional & scientific | 2023 |
| Cohn Transactional Consulting Limited | Professional & scientific | 2013 |
| Cole Mechanical Services Limited | Manufacturing | 1977 |
| Colemanmyers Construction Limited | Construction | 2014 |
| Coleshill House Residents Association Limited | Households | 1978 |
| Colette Film Holdings Ltd | Information & communication | 2016 |
| Colette Film Productions Limited | Information & communication | 2016 |
| Colin Hitch Consultants Limited | Wholesale & retail | 2023 |
| Come Alive Success Coaching Ltd | Health & social care | 2013 |
| Cometbase Limited | Professional & scientific | 1987 |
| Comfortable Properties Limited | Real estate | 1992 |
| Complete Cargo Resource Limited | Transport & logistics | 2025 |
| Component Assemblies Ltd | Households | 2020 |
| Connect Systems Limited | Information & communication | 2020 |
| Consensus Planning Limited | Construction | 2001 |
| Conseq Limited | Administrative & support | 1998 |
| Console Sauce Limited | Wholesale & retail | 2022 |
| Constellate Global Talent Ltd | Professional & scientific | 2022 |
| Control-N Limited | Information & communication | 2024 |
| Convenire Developments Limited | Construction | 2015 |
| Cooking Onions Limited | Administrative & support | 2023 |
| Coolroots Limited | Information & communication | 2025 |
| Coombe Management Services Limited | Administrative & support | 2004 |
| Coombs Automotive Limited | Extraterritorial | 2015 |
| Coombs Electra Ltd | Extraterritorial | 2020 |
| Coombs Heritage Limited | Extraterritorial | 2012 |