| C&M Trading Ltd | Wholesale & retail | 2023 |
| C. Oakes & SON Limited | Construction | 2004 |
| C2E Ltd | Information & communication | 2020 |
| C4K Education Ltd | Administrative & support | 2015 |
| Caddyconnect Limited | Construction | 2017 |
| Cadpress Ltd. | Professional & scientific | 2016 |
| Cakecity Ltd | Manufacturing | 2025 |
| Camborne Joinery Limited | Manufacturing | 1994 |
| Camdena Ltd | Extraterritorial | 2011 |
| CAN YOU Hear ME Ltd | Health & social care | 2023 |
| CAN YOU Hear ME South West Limited | Health & social care | 2026 |
| Cannyquiz Ltd | Information & communication | 2026 |
| Cardrew Management Company Limited | Construction | 2006 |
| Care on Call Limited | Health & social care | 2025 |
| Carefree Cornwall | Education | 2008 |
| Carers Break Community Interest Company | Health & social care | 2013 |
| Carlton Apartments Penzance Management Ltd | Real estate | 2025 |
| Carmichael's Properties Ltd | Real estate | 2024 |
| Carn Brea Leisure Centre (Trading) Ltd | Arts & recreation | 2001 |
| Carn Brea Leisure Centre Trust | Arts & recreation | 1999 |
| Carnleigh Ltd | Wholesale & retail | 2005 |
| Carnview Associates Limited | Information & communication | 2005 |
| Carrak Consulting Ltd | Professional & scientific | 2016 |
| Carrick Consultancy Ltd | Construction | 2023 |
| Carter's Trading Co. Ltd | Hospitality | 2019 |
| Carters Cornish Shellfish Limited | Agriculture & fishing | 2018 |
| Casas Jones Property Choice Ltd | Real estate | 2025 |
| Castle Bay Management Company (Falmouth) Ltd | Households | 2010 |
| Castle Hill Court Management Company Limited | Households | 1987 |
| Castlewedge Limited | Real estate | 1984 |
| Castria Group Limited | Professional & scientific | 2018 |
| Castria Infra Limited | Professional & scientific | 2021 |
| Castria Limited | Professional & scientific | 1995 |
| Caswell Carpentry Limited | Manufacturing | 2025 |
| Catherine Bennett Ltd | Professional & scientific | 2015 |
| Cayforth Management Limited | Households | 1985 |
| CCS Heating & Renewables Ltd | Construction | 2023 |
| Ceejay and FAM Limited | Health & social care | 2016 |
| Celebi 34 Limited | Hospitality | 2019 |
| Celt Creative Ltd | Professional & scientific | 2016 |
| Celtic Bookkeeping and Accountancy Services Ltd | Professional & scientific | 2019 |
| Celtic Connexions Properties Ltd | Construction | 2020 |
| Celtic Offshore Services Ltd | Professional & scientific | 2024 |
| Celtic Properties SW Limited | Real estate | 2022 |
| Central Garage MOT and Repair Centre Ltd. | Wholesale & retail | 2016 |
| Central Tench Limited | Wholesale & retail | 2025 |
| CFC Wellness Ltd | Health & social care | 2026 |
| Cfsnet Ltd | Wholesale & retail | 2012 |
| Chalk Pink Limited | Wholesale & retail | 2017 |
| Chalk Pink Linen Company Limited | Wholesale & retail | 2017 |
| Chapel Motors Ltd | Wholesale & retail | 2023 |
| Chapmed Ltd | Health & social care | 2023 |
| Charlie Grace Limited | Information & communication | 2020 |
| Charlotte James IFA Limited | Financial services | 2008 |
| Chavigny Ltd | Hospitality | 2017 |
| Check on Recruitment Ltd | Administrative & support | 2022 |
| Chelec BP Ltd | Manufacturing | 2026 |
| Chess 4U Ltd | Arts & recreation | 2025 |
| Chfs Developments Ltd | Construction | 2022 |
| Chillflow Solutions Limited | Construction | 2006 |
| Choose Good Design Limited | Administrative & support | 2007 |
| Christian Services Ltd | Information & communication | 2025 |
| Christopher Edward Gladwell Limited | Extraterritorial | 2025 |
| Chrononauts Club Ltd | Wholesale & retail | 2025 |
| Chrysalis Projects Limited | Construction | 2020 |
| CHT Trading Ltd | Other services | 2026 |
| CHY Holdings Limited | Agriculture & fishing | 2021 |
| CHY Porth Mortgage & Protection Planning Ltd | Financial services | 2023 |
| Chy-An-Mor Ltd | Households | 2026 |
| CIM Catering Ltd | Hospitality | 2019 |
| Cinder Healthcare Ltd | Health & social care | 2024 |
| Ckhms Ltd | Professional & scientific | 2025 |
| Claremont Vean Management Company Limited | Households | 2021 |
| Clark Jenner Angove Accountants Ltd | Professional & scientific | 2013 |
| Clean and Simple Cornwall Ltd | Administrative & support | 2021 |
| Cloud 9 Hang Gliding & Paragliding Limited | Arts & recreation | 2010 |
| Clymo Property Investments Limited | Construction | 2021 |
| CMI Synergy Limited | Professional & scientific | 2007 |
| Co Living Cornwall Ltd | Real estate | 2026 |
| Co/Motion Projects CIC | Information & communication | 2023 |
| Coast to Coast Carpentry Ltd | Manufacturing | 2025 |
| Coast to Coast Windscreens Limited | Wholesale & retail | 2023 |
| Coastal Adventures Ltd | Arts & recreation | 2023 |
| Coastline Care Limited | Health & social care | 2008 |
| Coastline Design and Build Limited | Professional & scientific | 2015 |
| Coastline Homes Limited | Construction | 2017 |
| Coastline Housing Limited | Real estate | 1996 |
| Coastline Services Limited | Construction | 2005 |
| Codeslayer Ltd | Information & communication | 2015 |
| Coherent Training Ltd | Professional & scientific | 2024 |
| Coinagehall Place Management Company Limited | Households | 2007 |
| Collection and Repair Garage Services Limited | Wholesale & retail | 2019 |
| Colletts Court Management Company Limited | Households | 2023 |
| Colwill Properties Ltd | Households | 2024 |
| Commercial Park Management Limited | Real estate | 2025 |
| Communication Experts Limited | Education | 1989 |
| Compact Rails & Systems Limited | Manufacturing | 2013 |
| Concept Cooling Ltd | Manufacturing | 2020 |
| Concept Yachts Europe Limited | Construction | 2011 |
| Concrete & Reinforcement Solutions Ltd | Construction | 2024 |