| Chayofa Place Management Company Limited | Households | 1999 |
| Cherrytree Shutters Ltd | Construction | 2012 |
| Chesters Dog Walking Limited | Other services | 2024 |
| Chewton Developments Limited | Construction | 2017 |
| Chewton Developments New Build Limited | Real estate | 2020 |
| Chickook Ltd | Manufacturing | 2022 |
| Chilli HUT Limited | Hospitality | 2016 |
| Chiron Consulting Group Ltd | Professional & scientific | 2025 |
| Chitova Couriers Ltd | Transport & logistics | 2025 |
| Chlo Enterprises Ltd | Wholesale & retail | 2021 |
| Christ Apostolic Church Mountain of Peace & Power of GOD Ministry Ltd | Professional & scientific | 2023 |
| Chrysalis Partners Hampshire Ltd | Professional & scientific | 2023 |
| Chunky Chips Gosport Ltd | Hospitality | 2024 |
| Churchers Construction Ltd | Construction | 2023 |
| Churchill Mobile Bodyshop Ltd | Wholesale & retail | 2024 |
| Ciaran Barker Ltd | Manufacturing | 2024 |
| Cirus Management Limited | Professional & scientific | 1995 |
| Citizens Advice Gosport | Other services | 2006 |
| City Retreats Limited | Real estate | 2018 |
| CJS Property Services (South Coast) Limited | Construction | 2017 |
| CL Real Estate Ltd | Real estate | 2019 |
| Clarence Investments Ltd | Real estate | 2021 |
| Clarity 8 Limited | Professional & scientific | 2021 |
| Clark Motorsport Engineering Ltd | Wholesale & retail | 2026 |
| Clarke ENG Ltd | Construction | 2016 |
| Clarkes Arundel Limited | Real estate | 2005 |
| Clarkes Residential Estate Agents Limited | Real estate | 2005 |
| Classic Wheels Limited | Energy | 1993 |
| Claypole Limited | Administrative & support | 2011 |
| Cleanair Ventilation Systems Ltd | Construction | 2016 |
| Cleanspace (Commercial Cleaning Services) Ltd | Other services | 2010 |
| Clearview Cleaning Services (Wessex) Limited | Administrative & support | 2020 |
| Clegg Investments Limited | Real estate | 2019 |
| Clever Car Collection Ltd | Wholesale & retail | 2023 |
| CLF Wind Ltd | Professional & scientific | 2024 |
| Clickgran Limited | Wholesale & retail | 2025 |
| Clipper Ventures Holdings PLC | Professional & scientific | 2009 |
| Clipper Ventures Online Limited | Other services | 1996 |
| Clipper Ventures PLC | Administrative & support | 1995 |
| Clique NOT Ltd | Construction | 2026 |
| Clique Roofing & Cladding Ltd | Construction | 2022 |
| Closed Cell Removal Ltd | Construction | 2026 |
| CMA Aviation Ltd | Manufacturing | 2014 |
| CMS Construction Ltd | Construction | 2021 |
| CMS Marine Ltd | Professional & scientific | 2025 |
| Cmsecretarial Ltd | Administrative & support | 2025 |
| Co-Lab People Limited | Administrative & support | 2008 |
| Coach Ellie JO Ltd | Administrative & support | 2026 |
| Coastal Legacy Ltd | Professional & scientific | 2025 |
| Codingbeard Limited | Information & communication | 2015 |
| Coffee Place 2 (UK) Ltd | Hospitality | 2010 |
| Coldstream Coldrooms - Garden Offices Ltd | Manufacturing | 2010 |
| Collingwood Homecare Ltd | Health & social care | 2021 |
| Collins Fire Consultants Ltd | Professional & scientific | 2016 |
| Collins Security Installations Limited | Administrative & support | 2016 |
| Colourworx Garage Services Ltd | Wholesale & retail | 2010 |
| Colznet Ltd | Information & communication | 2023 |
| Com-Part Products Limited | Extraterritorial | 2023 |
| Comcat Recruitment Ltd | Administrative & support | 2021 |
| Comet Classics Limited | Other services | 2014 |
| Commercial & Defence Auditing Solutions Ltd | Professional & scientific | 2025 |
| Compass Electrical Projects Limited | Construction | 2016 |
| Complete Holiday Homes Ltd | Hospitality | 2012 |
| Comval Limited | Health & social care | 2019 |
| Consult Shaw Limited | Professional & scientific | 2023 |
| Content With Lydia Ltd | Professional & scientific | 2024 |
| Cooper Heating Ltd | Construction | 2025 |
| COR Plus Limited | Wholesale & retail | 2023 |
| Coreway Pro Ltd | Information & communication | 2026 |
| Cornerstone System Engineering Limited | Professional & scientific | 2026 |
| Corvus Design Ltd | Real estate | 2015 |
| Costa Consultants Solent UK Ltd | Professional & scientific | 2020 |
| Coursomni Ltd | Education | 2025 |
| Court Barn Catering (Commercial) Limited | Hospitality | 2023 |
| Court Barn Catering (Retail) Ltd | Hospitality | 2023 |
| Courtside Sports Limited | Arts & recreation | 2008 |
| Cpba Ltd | Information & communication | 2010 |
| CPG Capital Limited | Financial services | 2024 |
| CPG Holdings Limited | Professional & scientific | 2003 |
| CPG Logistics Limited | Transport & logistics | 1991 |
| CPM Civils Ltd | Construction | 2025 |
| CR Composites Ltd | Manufacturing | 2018 |
| Craft Yourself Happy Ltd | Professional & scientific | 2023 |
| Cray House Residents Company Limited | Households | 2005 |
| CRC Installs Limited | Construction | 2023 |
| Crestwood Realty Limited | Real estate | 2025 |
| Crius Enterprises Ltd | Information & communication | 2016 |
| Croft Holdings Limited | Arts & recreation | 2016 |
| Crosley Associates Limited | Manufacturing | 2002 |
| Crowded Room Ltd | Arts & recreation | 2022 |
| Crown Mews (Gosport) Freehold Company Limited | Households | 2014 |
| Crown Mews (Gosport) Management Company Limited | Households | 1989 |
| Crusader Comics Ltd | Extraterritorial | 2025 |
| Cryodried Limited | Manufacturing | 2025 |
| Crystal Property Experts Ltd | Real estate | 2017 |
| CS - Digital Management Ltd | Information & communication | 2025 |
| Cs-Domestic Investments Limited | Real estate | 2021 |
| CSM Pipe Services Limited | Construction | 2018 |
| Cssc Projects Ltd | Construction | 2020 |
| CTN Leisure Limited | Wholesale & retail | 2023 |