| Chris Gates Legal Services Limited | Administrative & support | 2015 |
| Chris Holman Masts and Rigging Limited | Manufacturing | 1991 |
| Chris Orange Photography Ltd | Professional & scientific | 2011 |
| Chris Robertson Limited | Administrative & support | 2008 |
| Chris Webb Podiatry Limited | Health & social care | 2013 |
| Chris Wilkinson Tennis Solutions Limited | Education | 2013 |
| Christian Youth Enterprises Sailing Centre | Education | 1986 |
| Christine Tizzard Psychology Ltd | Health & social care | 2015 |
| Christopher J Gosden Ceramics Ltd | Extraterritorial | 2019 |
| Christopher Parker Fitness Ltd | Wholesale & retail | 2021 |
| Chronos Sustainability Ltd | Other services | 2017 |
| Chucklehead Cider Ltd | Manufacturing | 2010 |
| Chunkys Truck Limited | Hospitality | 2025 |
| Church Court Management (Selsey) Ltd | Households | 2019 |
| Church Farm (Bosham) Limited | Agriculture & fishing | 1991 |
| Church Farm Lodges Ltd | Real estate | 2025 |
| Church Farm Sidlesham Ltd | Agriculture & fishing | 2022 |
| Church Meadow (Bosham) Limited | Households | 2010 |
| Church Street Ltd | Real estate | 2017 |
| Churchill Country & Equestrian Estate Agents Limited | Real estate | 2003 |
| Churchill Freight Services Limited | Transport & logistics | 1980 |
| Churchill Homes & Estates Limited | Construction | 2008 |
| Chutzpah Investments Limited | Real estate | 2023 |
| Cinemobile Limited | Professional & scientific | 2002 |
| Circle Boutique Ltd | Wholesale & retail | 2024 |
| Circular Accountants Limited | Professional & scientific | 2023 |
| Circulus Limited | Extraterritorial | 2025 |
| Cissbury Consulting Limited | Professional & scientific | 2010 |
| Citation Pilot Services Limited | Real estate | 2014 |
| Citroen Car Club Limited | Other services | 2002 |
| Citygates Development Limited | Construction | 2025 |
| Civiel Publications Ltd | Information & communication | 2026 |
| Civil Engineering Contractors Association (Southern) Ltd | Other services | 1996 |
| CJ Auto Services Ltd | Wholesale & retail | 2025 |
| CJD (Vehicle Engineers) Limited | Wholesale & retail | 2002 |
| CJR Designs Services Ltd | Professional & scientific | 2026 |
| Cjsl Property Limited | Real estate | 2012 |
| CK Mechanical Ltd | Professional & scientific | 2017 |
| CK Welding Ltd | Construction | 2025 |
| CKH Saunders Ltd | Households | 2025 |
| Ckrd Ltd | Information & communication | 2020 |
| Claas Management Solutions Ltd | Professional & scientific | 2018 |
| Claire Lawrence Ltd | Information & communication | 2019 |
| Claire Snowdon-Darling Show Limited | Health & social care | 2021 |
| Clara Films Ltd | Information & communication | 2021 |
| Clara Vitoria Homes Limited | Wholesale & retail | 2022 |
| Clare Hudson Limited | Professional & scientific | 2008 |
| Claridge Creative Limited | Professional & scientific | 2021 |
| Clarke Property Ltd | Real estate | 2015 |
| Clarks Caravan & Boat Haulage Limited | Transport & logistics | 2007 |
| Clarkson-Paul Carpentry & Electrical Ltd | Manufacturing | 2024 |
| Classix Clothing Limited | Wholesale & retail | 2019 |
| Claver Gardens Limited | Real estate | 2014 |
| Clayman Supplies Limited | Wholesale & retail | 2010 |
| Clayton Partners Ltd | Other services | 2012 |
| Cleanroom and Laboratory Management Ltd | Real estate | 2022 |
| Clear Aura Limited | Other services | 2025 |
| Clear People Consulting Ltd | Professional & scientific | 2026 |
| Clear Sense Financial Planning Limited | Financial services | 2017 |
| Clements Automotive Ltd | Wholesale & retail | 2020 |
| Clemsfold Farm Limited | Construction | 2021 |
| Cleveland Mews Freehold Limited | Households | 2023 |
| Cleveland Road PMC Limited | Real estate | 2019 |
| Clever Photographer Limited | Professional & scientific | 2024 |
| Client Services & Support Limited | Other services | 2013 |
| Client Services (Global) Limited | Other services | 2013 |
| Client Services (Investor Relations) Ltd | Other services | 2015 |
| Clifford Enterprises Limited | Real estate | 1933 |
| Clifftop Holdings Limited | Real estate | 2020 |
| Clifftop Limited | Real estate | 2020 |
| Clifton Court (Poole) Limited | Households | 1987 |
| Clifts Catering Ltd | Hospitality | 2011 |
| Climate Eco Heating Ltd | Construction | 2023 |
| Climate Positive Food Limited | Manufacturing | 2021 |
| Climate Project Services Ltd | Professional & scientific | 2012 |
| Clinical Forums Ltd | Information & communication | 2009 |
| Clive Stubbs & SON Builders & Bricklayers Ltd | Construction | 2016 |
| Clockwise Cleaning Services Ltd | Administrative & support | 2017 |
| Closed Loop Homes Ltd | Real estate | 2025 |
| Closer Products Ltd | Manufacturing | 2024 |
| Clothkits Limited | Manufacturing | 2006 |
| Cloud 9 Architecture Ltd | Professional & scientific | 2022 |
| Cloud 9 Design Studio Ltd | Professional & scientific | 2015 |
| Cloud 9 Vets Ltd | Professional & scientific | 2017 |
| CLOUD9SERVICES Limited | Information & communication | 2013 |
| Cloudchefs Ltd | Hospitality | 2026 |
| Cloudgrove Limited | Professional & scientific | 2008 |
| Clrd Waste Ltd | Information & communication | 2026 |
| Clumber Street Properties Limited | Real estate | 2010 |
| CMC Lift UK Ltd | Wholesale & retail | 2021 |
| Cmct Services Ltd | Wholesale & retail | 2019 |
| Cmds Management Limited | Professional & scientific | 2016 |
| Cmenergyinsight Ltd | Information & communication | 2018 |
| CN Engineering Services Ltd | Professional & scientific | 2020 |
| Coach House Land Limited | Transport & logistics | 2009 |
| Coast & Country Family Property Developers Ltd | Real estate | 2026 |
| Coast Star Ltd | Professional & scientific | 2021 |
| Coast to Coast Marine Surveyors & Consultants Limited | Manufacturing | 2022 |
| Coastal Bookkeeping Agency Limited | Professional & scientific | 2000 |
| Coastal Design & Build Ltd | Construction | 2020 |