| Carpet Monkey Ltd | Administrative & support | 2020 |
| Cassels Farm Limited | Agriculture & fishing | 1962 |
| Cavy Krazy [Dorset] Ltd | Agriculture & fishing | 2022 |
| CDT Housing Ltd | Real estate | 2024 |
| Cedar Direct Limited | Wholesale & retail | 2017 |
| Centre for European Interfirm Comparison Limited | Professional & scientific | 1973 |
| Cernuschi a Ltd | Information & communication | 2026 |
| CG Piling Limited | Construction | 2019 |
| CGA Membership Services Limited | Financial services | 1995 |
| Chalkstream Wines Limited | Professional & scientific | 2022 |
| Chant Design Limited | Information & communication | 2016 |
| Chapelstone Construction Ltd | Construction | 2023 |
| Chapelstone Ltd | Construction | 2008 |
| Chapmans & Bishop Ltd | Hospitality | 2024 |
| Charismatic Pets Ltd | Other services | 2013 |
| Charles Farris Limited | Manufacturing | 1988 |
| Charles Platt Consulting Limited | Professional & scientific | 2023 |
| Charlie Foxtrot Vintage Limited | Wholesale & retail | 2017 |
| Chat Global Ltd | Professional & scientific | 2011 |
| Cheddar From Cheddar Limited | Manufacturing | 2015 |
| Chefs on Stage Limited | Manufacturing | 2010 |
| Chestnut Close (Warminster) Management Company Limited | Real estate | 2007 |
| Chestnut Tree Gardens Management Company Limited | Households | 2006 |
| Cheventing Limited | Real estate | 2021 |
| Chibasha Ltd | Health & social care | 2025 |
| Choice Illustration Limited | Professional & scientific | 2009 |
| Chorddata Ltd | Professional & scientific | 2019 |
| Chris Mitchell Consulting Ltd | Professional & scientific | 2018 |
| Chris Potter Site Management Ltd | Construction | 2014 |
| Chris Turner Accounting Ltd | Professional & scientific | 2025 |
| Chronity Ltd | Information & communication | 2026 |
| Church Street Mews Management Company Limited | Households | 2007 |
| Cifc Limited | Professional & scientific | 1988 |
| CJR Dentistry Ltd | Health & social care | 2024 |
| CJS Farming Limited | Financial services | 2025 |
| CK Equestrian Limited | Arts & recreation | 2020 |
| Classic Fitness Ltd | Arts & recreation | 2021 |
| Claypits Power Limited | Administrative & support | 2020 |
| Clean Works for YOU Ltd | Administrative & support | 2022 |
| Clock Cottages Limited | Real estate | 1998 |
| Cloud Charge Defence Ltd | Professional & scientific | 2025 |
| Cloud Homecare Limited | Health & social care | 2007 |
| Codford Broadleaze Bar Limited | Hospitality | 2015 |
| Codford Tea Rooms Ltd | Health & social care | 2026 |
| Coffee Lusso Limited | Wholesale & retail | 2019 |
| Cognaterra Limited | Information & communication | 2025 |
| Colliss Motors Limited | Wholesale & retail | 2003 |
| Colwood Consultancy Limited | Professional & scientific | 2025 |
| Comley Racing Ltd | Arts & recreation | 2024 |
| Community Organisers Limited | Education | 2012 |
| Complete Fire Services SW Ltd | Other services | 2016 |
| Connelly Industries Limited | Professional & scientific | 2007 |
| Connelly Property Services Ltd | Real estate | 2006 |
| Conservatories, Orangeries and Windows by King Limited | Construction | 2004 |
| Contracting Services (Education and Skills) Limited | Professional & scientific | 2015 |
| Coochie Rhodes Limited | Extraterritorial | 2016 |
| Coracle Archaeology Ltd | Professional & scientific | 2019 |
| Cordial Safety Limited | Public administration | 2024 |
| Cornish Electrical Services Limited | Construction | 1997 |
| Corrington Estates Limited | Real estate | 1937 |
| Corsley Show Ltd | Education | 2016 |
| Cosycork Insulation Ltd | Construction | 2026 |
| Cotswold International Transport Limited | Transport & logistics | 2024 |
| Country Warehouse (Crockerton) Ltd (the) | Real estate | 1973 |
| Court Electrical Limited | Construction | 2002 |
| Cousinz Limited | Hospitality | 2020 |
| Coward Contracting Limited | Agriculture & fishing | 2019 |
| Cranborne International Limited | Professional & scientific | 2015 |
| Crea PAX Ltd | Health & social care | 2022 |
| Creative Titan Limited | Arts & recreation | 2012 |
| Creo Design & Build Limited | Construction | 2023 |
| Cross Keys Corsley Limited | Hospitality | 2016 |
| Crossfit Warminster Ltd | Arts & recreation | 2023 |
| Crusader House Management Company Limited | Professional & scientific | 2022 |
| CU Healthy Limited | Manufacturing | 2016 |
| Cube HR (South) Ltd | Professional & scientific | 2018 |
| Custom Built of Westbury Limited | Construction | 2004 |
| CUT to the Chase Active Wear Limited | Wholesale & retail | 2022 |
| D J Doors Limited | Construction | 2014 |
| D Short (Bath) Limited | Construction | 2002 |
| D Tite Ltd | Construction | 2023 |
| D. Munster Building Contractor Ltd | Construction | 2015 |
| Dalal Street Limited | Extraterritorial | 2010 |
| Dalesway Daymer LLP | | 2023 |
| Dalesway Daymer NO.2 LLP | | 2024 |
| DAN Patch General Building Ltd | Construction | 2018 |
| Daniel Keene Limited | Construction | 2016 |
| Danmaid Limited | Manufacturing | 1986 |
| Danogips Limited | Wholesale & retail | 1997 |
| Dapl Ltd | Wholesale & retail | 2024 |
| David Cobley Ltd | Arts & recreation | 2006 |
| David J Edmunds & Co Limited | Professional & scientific | 2005 |
| David Santhouse Consulting Limited | Professional & scientific | 2009 |
| David Sharp Architecture Ltd | Professional & scientific | 2014 |
| David Timms Consulting Limited | Education | 2011 |
| Daymer Dalesway Ltd | Financial services | 2020 |
| Daysheet Ltd | Arts & recreation | 2024 |
| Dean Fletcher Building Contractor LLP | | 2005 |
| Delegations Ltd | Professional & scientific | 2021 |
| Dent Corrector Ltd | Wholesale & retail | 2024 |