| Corfe Building & Maintenance Ltd | Construction | 2023 |
| Corfe Conversions Limited | Financial services | 2022 |
| Corfe Eggs Limited | Agriculture & fishing | 2018 |
| Corfe Mullen GAS Limited | Construction | 2004 |
| Corfe Mullen Scaffolding Ltd | Construction | 2024 |
| Corfe Technical Services Limited | Professional & scientific | 2019 |
| Corne Consulting Ltd | Professional & scientific | 2018 |
| Corner Software Solutions Limited | Information & communication | 2022 |
| Cornerstone Business Services Ltd | Administrative & support | 2016 |
| Cornerstone Content Limited | Information & communication | 2023 |
| Corome Ltd | Professional & scientific | 2024 |
| Corporate Financial Ltd | Information & communication | 2001 |
| Corporate Solutions (Poole) Ltd | Professional & scientific | 2015 |
| Corporate Strengths Ltd | Professional & scientific | 2008 |
| Corpxsglobal Ltd | Extraterritorial | 2017 |
| Corrugated Plastic Products Limited | Manufacturing | 1980 |
| Corser Creative Ltd | Information & communication | 2024 |
| Cortex Delivery Partners Limited | Information & communication | 2026 |
| Cortex Lighting Limited | Manufacturing | 2003 |
| Corvos Astro Engineering Ltd | Professional & scientific | 2010 |
| Costantino Furniture Imports Limited | Wholesale & retail | 2010 |
| Costantino Property Holdings Limited | Real estate | 2016 |
| Costello Motorcycle Training Ltd | Education | 2021 |
| Costello Studios Limited | Information & communication | 2025 |
| Cosy Guttering Limited | Administrative & support | 2014 |
| Cotswold Communications Limited | Information & communication | 1993 |
| Cotswold Edge Limited | Real estate | 2020 |
| Cotswold Financial Solutions Ltd | Financial services | 2018 |
| Cotton Tree Partners Limited | Information & communication | 2026 |
| Counterpress Media Ltd | Information & communication | 2024 |
| Country Care Horticultural Products Ltd | Wholesale & retail | 2010 |
| Country Kennels (West Moors) Ltd | Other services | 2019 |
| Countryman Foods Limited | Extraterritorial | 2018 |
| Coupe IT Limited | Information & communication | 2004 |
| Court Craft Netball Coaching Ltd | Education | 2025 |
| Cove Creations Ltd | Construction | 2018 |
| Covert Enterprises Ltd | Hospitality | 2021 |
| Covington Aircraft EU, Ltd | Manufacturing | 2019 |
| Cowdrys (Wimborne ) Limited | Manufacturing | 1967 |
| Cowgrove Farm Limited | Agriculture & fishing | 2010 |
| Cowles Group Holdings Limited | Financial services | 2023 |
| Cowles Holdings Limited | Financial services | 1993 |
| COX & Haswell Limited | Professional & scientific | 1960 |
| Coxwms Ltd | Information & communication | 2026 |
| CP Projects 360 Ltd | Professional & scientific | 2021 |
| CPB Engineering Services Limited | Professional & scientific | 2017 |
| CPL Consulting Limited | Professional & scientific | 2025 |
| CPM - Construction Planning & Management Limited | Professional & scientific | 2023 |
| CPP Industrial Packaging Ltd. | Manufacturing | 2005 |
| CPQ Solutions Limited | Information & communication | 2020 |
| CR0 Systems Ltd | Information & communication | 2026 |
| Crabton Close Management Company Limited | Households | 2002 |
| Crackerjack Concepts Limited | Wholesale & retail | 2012 |
| Craft Campers (Dorset) Limited | Administrative & support | 2023 |
| Craftudio Limited | Professional & scientific | 2024 |
| Craigmore (Bournemouth) Limited | Administrative & support | 1987 |
| Cranborne Chase Consulting Limited | Information & communication | 2023 |
| Cranborne Garden Centre Limited | Wholesale & retail | 2014 |
| Crane Cleaning Services (Cranborne) Ltd. | Administrative & support | 2003 |
| Creative ALL Stars Limited | Information & communication | 2006 |
| Creative Carpentry (Dorset) Limited | Construction | 2004 |
| Creative Impact (South-West) Limited | Professional & scientific | 2014 |
| Creative Klick Photography Ltd | Professional & scientific | 2019 |
| Creative Media Solutions Ltd | Information & communication | 2021 |
| Creativedge Property Ltd | Hospitality | 2025 |
| Creditplus Finance Ltd | Wholesale & retail | 2004 |
| Crendon Park Consulting Limited | Information & communication | 2026 |
| Crest Court Management Limited | Real estate | 2007 |
| Crichel Capital Ltd | Financial services | 2022 |
| Cricketfield Associates Limited | Professional & scientific | 2021 |
| Crim UK Ltd | Other services | 2012 |
| Crimson Peacock Limited | Wholesale & retail | 2019 |
| Crimsworth Software Limited | Information & communication | 2024 |
| Crofton (Furzehill) Management Company Limited | Households | 2021 |
| Croombs Welding Ltd | Manufacturing | 2025 |
| Cross Claws Project Delivery Limited | Information & communication | 2021 |
| Cross Domain Security Ltd | Information & communication | 2021 |
| Crow Lane Containers Ltd | Transport & logistics | 2023 |
| Crown Laminating Limited | Professional & scientific | 1979 |
| Cruise Technologies Limited | Information & communication | 2010 |
| Crushe Holdings Limited | Real estate | 2025 |
| Cryotronic Limited | Information & communication | 2025 |
| Crypto Secure Ltd | Information & communication | 2023 |
| CS Black Limited | Professional & scientific | 2019 |
| CS Sales Limited | Wholesale & retail | 2025 |
| CSC Marine Limited | Manufacturing | 2022 |
| CSG (Fire and Security) Limited | Administrative & support | 2005 |
| CSG Holdings (Southern) Limited | Financial services | 2024 |
| CSS Miami Holdings Limited | Financial services | 2021 |
| CT Commercial Management Services Ltd | Administrative & support | 2017 |
| CT Nuclear Limited | Professional & scientific | 2020 |
| CTD Safety Limited | Education | 2016 |
| CTR Ltd | Information & communication | 2021 |
| Ctrl Esports Ltd | Arts & recreation | 2023 |
| Ctrlwrx Limited | Information & communication | 2026 |
| Cube Property Group Ltd | Real estate | 2021 |
| Cubic Risk Solutions Limited | Information & communication | 2010 |
| Cueball Actuarial Limited | Financial services | 2017 |
| Culahk Limited | Transport & logistics | 2024 |
| Cullen Digital Solutions Ltd | Information & communication | 2024 |