| C.J.S. Precision Engineering Limited | Professional & scientific | 2000 |
| C.M.C. Heating Ltd | Construction | 2003 |
| C.M.Enterprises (Dorset) Ltd | Health & social care | 2013 |
| C3 Ergonomics Ltd | Professional & scientific | 2022 |
| C3M Limited | Information & communication | 2025 |
| C3O Limited | Information & communication | 2022 |
| Cable Engineering Ltd | Professional & scientific | 2014 |
| Cacom Limited | Information & communication | 2024 |
| CAD 4 Jewellers Ltd | Manufacturing | 2020 |
| Cadcan Ltd | Other services | 2012 |
| Cadlux Design Ltd | Professional & scientific | 2022 |
| Cadogan Road Management Limited | Households | 2016 |
| Caeruleum Communications Ltd | Professional & scientific | 2018 |
| Cafe on the Square (Wimborne) Limited | Hospitality | 2015 |
| Caffesmith Limited | Manufacturing | 2018 |
| Cairns Copywriting Limited | Professional & scientific | 2018 |
| Caister Consultancy Ltd | Professional & scientific | 2019 |
| Calamita Consulting Ltd | Professional & scientific | 2023 |
| Calcinotto Associates (2007) Ltd | Extraterritorial | 2004 |
| Calcinotto Holdings Limited | Financial services | 2013 |
| Calcinotto Limited | Professional & scientific | 2014 |
| Calder Valley Management Company Limited | Households | 2018 |
| Caleb Moore Specialist Projects Ltd | Construction | 2022 |
| Cali Ltd | Information & communication | 2023 |
| Calibre Inc. Limited | Arts & recreation | 2016 |
| Caliburn Aviation Solutions Limited | Professional & scientific | 2017 |
| Call ME Matt Ltd | Information & communication | 2024 |
| Callan Civil Engineering Ltd | Construction | 2023 |
| Callcott Street Twenty Two Limited | Professional & scientific | 2022 |
| Calm Delivery Limited | Information & communication | 2025 |
| Calmec Ltd | Manufacturing | 2006 |
| Calmec Services Limited | Administrative & support | 2024 |
| Calthenia Limited | Real estate | 2025 |
| Caltheon Ltd | Financial services | 2023 |
| Camellia Kitchen Limited | Manufacturing | 2022 |
| Cameo Systems Holdings Limited | Financial services | 2021 |
| Cameo Systems Limited | Manufacturing | 1990 |
| Cameron-Hemley Limited | Financial services | 1997 |
| Camilla Culley Limited | Other services | 2005 |
| Campain Limited | Education | 2025 |
| Canford Business Park Limited | Real estate | 2011 |
| Canford Carpentry Ltd | Construction | 2014 |
| Canford Developments Ltd | Construction | 2000 |
| Canford Drains Excavation Limited | Construction | 2008 |
| Canford Drains Ltd | Administrative & support | 2000 |
| Canford Energy Park Limited | Other services | 2019 |
| Canford Floral Farm Management Company Limited | Real estate | 1973 |
| Canford Group Holdings Ltd | Administrative & support | 2025 |
| Canford Heights (Poole) Management Company Limited | Households | 2011 |
| Canford Holdings (Dorset) Ltd | Financial services | 2024 |
| Canford Leisure Vehicles Limited | Manufacturing | 2017 |
| Canford Magna Self Storage Ltd | Other services | 2010 |
| Canford Park Holdings Ltd | Real estate | 2021 |
| Canford Park Sports Limited | Arts & recreation | 1999 |
| Canford Projects Ltd | Construction | 2017 |
| Canford Renewable Energy Limited | Agriculture & fishing | 1994 |
| Canford School,Limited | Education | 1923 |
| Canford Software Consultancy Limited | Real estate | 1998 |
| Canford Tankers Limited | Water & waste | 2026 |
| Canine Coders Limited | Information & communication | 2024 |
| Cannon Consulting Group Limited | Information & communication | 2025 |
| Cannon Corporation Limited | Information & communication | 2006 |
| Cantadora Ltd | Professional & scientific | 2018 |
| Capetec Limited | Information & communication | 2023 |
| Capistrano Ltd | Information & communication | 2024 |
| Capital Asset Funding Limited | Wholesale & retail | 2018 |
| Capital Nests Limited | Real estate | 2021 |
| Caprisar Productions Ltd | Information & communication | 2014 |
| Capup Limited | Information & communication | 2022 |
| Carbery Developments Limited | Construction | 2020 |
| Carbo Developments Limited | Manufacturing | 2021 |
| Carbon Based Copy Limited | Professional & scientific | 2025 |
| Carbonart Ltd | Manufacturing | 2016 |
| Carboora Limited | Wholesale & retail | 2023 |
| Care at Limited | Administrative & support | 2000 |
| Care Awesome Ltd | Information & communication | 2018 |
| Careborne Health & Technology Group Ltd | Wholesale & retail | 2025 |
| Carelec Limited | Construction | 2024 |
| Carey & Co Financial Solutions Limited | Professional & scientific | 2026 |
| Caribou Campers Ltd | Manufacturing | 2023 |
| Carine Yacht Services Limited | Other services | 2018 |
| Carlinda Digital Ltd | Information & communication | 2023 |
| Carlos SS Properties Limited | Real estate | 2001 |
| Carmel and Butcher Limited | Professional & scientific | 2019 |
| Carmen ETC Limited | Real estate | 2017 |
| Carmichael Engineering Ccxvi Ltd | Information & communication | 2019 |
| Carnaval Stacks Limited | Information & communication | 2025 |
| Carnival Flowers Ltd | Wholesale & retail | 2024 |
| Caroline Welsh Limited | Health & social care | 2017 |
| Carolyn Jacques Ltd | Professional & scientific | 2019 |
| Carosello Limited | Information & communication | 2024 |
| Carpe Diem Ventures Limited | Information & communication | 2016 |
| Carravindoon Limited | Energy | 2020 |
| Carron Brown Limited | Agriculture & fishing | 2020 |
| Cars of Christchurch Limited | Wholesale & retail | 2016 |
| Carter Contracting Ltd | Construction | 2024 |
| Carter's & Crew Barbershop Ltd | Other services | 2023 |
| CAS32 Consultants Ltd | Information & communication | 2022 |
| Casa Camp Limited | Arts & recreation | 2015 |
| Casa Sports Academy Ltd | Arts & recreation | 2007 |