| Charles Hurley Ltd | Professional & scientific | 2015 |
| Charles Longley Design Limited | Professional & scientific | 2017 |
| Charlesworth Surveyors Limited | Professional & scientific | 2018 |
| Charlotte HB Limited | Transport & logistics | 2023 |
| Charlwood Aesthetics Ltd | Health & social care | 2022 |
| Charlwood Electrical Limited | Construction | 2009 |
| Charlwood Estates Limited | Real estate | 2020 |
| Chatelet Close Management Company Ltd. | Households | 2009 |
| Chaumuroz Ltd | Health & social care | 2022 |
| CHB Demolition Limited | Construction | 2025 |
| Cheema Analytics Ltd | Information & communication | 2025 |
| Cheer Vibes Ltd | Wholesale & retail | 2025 |
| Ches (UK) Limited | Construction | 1988 |
| Chester Promotions Ltd | Other services | 2025 |
| Chia Food Ltd | Hospitality | 2025 |
| Chill Promotions Ltd | Administrative & support | 2011 |
| Chithurst Farm Limited | Agriculture & fishing | 2018 |
| Chloe Elizabeth Well-Being Ltd | Arts & recreation | 2023 |
| Chritom Limited | Real estate | 1986 |
| Church Road Motorworks Ltd | Wholesale & retail | 2022 |
| Church Road Residents Association Limited | Real estate | 1989 |
| Cinecraft Ltd | Manufacturing | 2024 |
| CJC Flooring Ltd | Construction | 2011 |
| Clark Interventions Limited | Administrative & support | 2015 |
| Clark Motor Engineering Limited | Wholesale & retail | 2009 |
| Clear Vision Media Limited | Information & communication | 2018 |
| Clearpath Disposal Ltd | Water & waste | 2026 |
| Clearpath QA Solutions Ltd | Professional & scientific | 2024 |
| Clearpathcollections Ltd | Administrative & support | 2024 |
| Clearpoint Environmental Ltd | Information & communication | 2026 |
| Clever Bean Media Ltd | Professional & scientific | 2011 |
| Click Smart Marketing Ltd | Professional & scientific | 2025 |
| Click UP Limited | Information & communication | 2011 |
| Clint Daniels Ltd | Real estate | 2026 |
| Cloud Consulting KK Ltd | Information & communication | 2024 |
| Clutter Clogs Limited | Administrative & support | 2022 |
| CMC Development Limited | Real estate | 2025 |
| Cmcc Designs Ltd | Professional & scientific | 2025 |
| Coachbase Ltd | Education | 2017 |
| Coders in Hoods Limited | Information & communication | 2019 |
| Cody's Waffles Ltd | Wholesale & retail | 2024 |
| Cogitare Limited | Information & communication | 2001 |
| Coinford Central Ltd | Water & waste | 2009 |
| Coinford Plant Limited | Administrative & support | 2008 |
| Colgate Boathouse Ltd | Hospitality | 2023 |
| Colin Smith Educational Consultancy Limited | Education | 2012 |
| Coline Bach Ltd | Other services | 2017 |
| Collective Newness Ltd | Professional & scientific | 2017 |
| Collier Property Investments Ltd | Construction | 2024 |
| Colonels Property Management Ltd | Real estate | 2023 |
| Colonel’S Catering Ltd | Hospitality | 2025 |
| Colson Home Ltd | Other services | 2023 |
| Colson Properties Limited | Real estate | 2025 |
| Comexuk Ltd | Professional & scientific | 2019 |
| Committed Code Ltd | Information & communication | 2013 |
| Compare and Park Ltd | Transport & logistics | 2017 |
| Complete 3PL Limited | Transport & logistics | 2022 |
| Complete Carpentry and Build Ltd | Construction | 2021 |
| Concept Carpentry (Bucks) Ltd | Construction | 2022 |
| Concept Smoke Systems Ltd | Manufacturing | 2003 |
| Concise Space Limited | Other services | 2026 |
| Conscious Happiness Ltd | Education | 2016 |
| Conscious Intentions Ltd | Other services | 2016 |
| Conservative Humanists Limited | Education | 2019 |
| Constables Property Services Limited | Construction | 2017 |
| Control Fire Services Ltd | Construction | 2023 |
| Cookie Courier Ltd | Hospitality | 2021 |
| Cooking Dilse Ltd | Hospitality | 2020 |
| Cool Kids Limited | Administrative & support | 2016 |
| Cornerways Childrens Services Limited | Health & social care | 2000 |
| Cornerways Fostering Services Limited | Health & social care | 2003 |
| Corniche Real Estate Ltd | Real estate | 2018 |
| Corporate Wealth Management Limited | Real estate | 2002 |
| Corrigan Bentley Executive Ltd | Administrative & support | 2014 |
| Corrigan Bentley Recruitment Ltd | Administrative & support | 2014 |
| Country Cousins Homecare Agencies Ltd | Administrative & support | 2019 |
| Countryside Supplies Limited | Wholesale & retail | 2005 |
| Countrywide Flooring Limited | Construction | 2022 |
| Covrig and Sons Building and Maintenance Limited | Construction | 2025 |
| Cowley Group Ltd | Construction | 2019 |
| CP Planning Services Ltd | Professional & scientific | 2014 |
| Cpj-Installations Ltd | Construction | 2022 |
| CPM Services (Southern) Ltd | Wholesale & retail | 2012 |
| Craftably Ltd | Wholesale & retail | 2020 |
| Crafti Corgi Ltd | Professional & scientific | 2025 |
| Crane Pest Control Ltd | Administrative & support | 2023 |
| Crawley Commercial Limited | Real estate | 2024 |
| Crawley Driver Training Limited | Extraterritorial | 2011 |
| Creative Garden & Landscape Supplies Limited | Administrative & support | 2020 |
| Creative Garden Nurseries Limited | Other services | 2020 |
| Creative Garden Projects Limited | Administrative & support | 2020 |
| Creative Garden Solutions Limited | Administrative & support | 2009 |
| Cressali Limited | Professional & scientific | 2015 |
| Cribzzz Limited | Real estate | 2022 |
| Crisfix Digital Ltd | Information & communication | 2020 |
| Crisfix Ltd | Information & communication | 2016 |
| Croft Studios Ltd | Information & communication | 2019 |
| Crofton Darfield Limited | Real estate | 2010 |
| Cross Country Floor Care Limited | Administrative & support | 2026 |
| Crown Traditional Barber Shop Ltd | Other services | 2024 |