| Coastal Landscaping Ltd | Administrative & support | 2025 |
| Coastal Learning Partnership | Education | 2015 |
| Coastal Properties South West Ltd | Real estate | 2018 |
| Coastal Radiology Limited | Health & social care | 2019 |
| Coastal Reach Management Company Limited | Households | 2012 |
| Coastcarpentry Ltd | Construction | 2023 |
| Coastline Capital Ltd | Financial services | 2022 |
| Coastline Community Trust | Administrative & support | 2022 |
| Coastline Electrical Services Ltd | Construction | 2020 |
| Coastline Group Ltd | Wholesale & retail | 2025 |
| Coastline Print Ltd | Manufacturing | 2019 |
| Coastline Retreats Ltd | Hospitality | 2021 |
| Coastline Solutions Limited | Wholesale & retail | 2018 |
| Coastline Vineyard Church | Other services | 2015 |
| Coastmoor Limited | | 1984 |
| Coastside Owners Limited | Households | 2018 |
| Cobby Professional Cleaning Services Limited | Administrative & support | 2025 |
| Cochrane Futures Ltd | Real estate | 2022 |
| Coco Sobo Ltd | Professional & scientific | 2023 |
| Cocobolo Carpentry & Construction Ltd | Manufacturing | 2024 |
| Cococharms Thai Therapy Limited | Other services | 2025 |
| Cocreate Dorset CIC | Education | 2019 |
| Coda Hotels Limited | Hospitality | 2008 |
| Code 4 Life Academy Ltd. | Other services | 2009 |
| Code Orange Ltd | Information & communication | 2012 |
| Codenative Limited | Information & communication | 2022 |
| Codeworks Innovations Limited | Information & communication | 2006 |
| COE & Jamieson (Okeford Fitzpaine) Limited | Construction | 2025 |
| Coffee Drivers Ltd | Hospitality | 2024 |
| Cogensoft Limited | Information & communication | 2018 |
| Cogitas Ltd | Other services | 2013 |
| Cognative Marketing Ltd | Professional & scientific | 2026 |
| Cognitive Reserve Limited | Information & communication | 2023 |
| Cojocia Engineering Limited | Manufacturing | 2014 |
| Col-Tec (Holdings) Ltd | Financial services | 2019 |
| Colant Limited | Information & communication | 2026 |
| Colavita Limited | Hospitality | 2025 |
| Cold Banana Commercial Ltd | Real estate | 2022 |
| Cold Banana Holdings Limited | Financial services | 2020 |
| Cold Banana Limited | Information & communication | 2015 |
| Cold Banana Properties Limited | Real estate | 2020 |
| Cole Rose Limited | Professional & scientific | 2022 |
| Coleface Ltd | Professional & scientific | 2010 |
| Colehill Community Library Limited | Arts & recreation | 2012 |
| Colehill Land Limited | Real estate | 2009 |
| Colehill Limited | Real estate | 1996 |
| Coleman FOX Limited | Financial services | 2022 |
| Coleman GM Limited | Wholesale & retail | 2022 |
| Colin Clark Builders Limited | Construction | 2002 |
| Collaborative People Solutions Ltd | Professional & scientific | 2025 |
| Collaboris Limited | Information & communication | 2007 |
| Collect & Deliver Cars Limited | Other services | 2021 |
| Collectible Club Limited | Wholesale & retail | 2026 |
| Collective Bournemouth Limited | Real estate | 2021 |
| Collective Investment Holdings Limited | Professional & scientific | 2022 |
| Collective Property Holdings Limited | Real estate | 2022 |
| Collectorsenvy Ltd | Wholesale & retail | 2026 |
| College Fields Ltd | Real estate | 2006 |
| Collett Design Ltd | Professional & scientific | 2024 |
| Collide Technical Recruitment Ltd | Administrative & support | 2023 |
| Collwood 37 Limited | Real estate | 2026 |
| Colonnade Court Residents Limited | Households | 2004 |
| Colour Marketing Limited | Professional & scientific | 2009 |
| Colourworks Painting & Decorating Limited | Construction | 2025 |
| Colts Sports Academy Limited | Arts & recreation | 2015 |
| Columbia 149 Limited | Households | 2006 |
| Columbia Pump Station and Driveway Limited | Households | 2024 |
| Colvin Apps Ltd | Information & communication | 2016 |
| Colvin Developments Ltd | Real estate | 2022 |
| Comast Holdings Limited | Financial services | 2019 |
| Comast Properties Limited | Real estate | 2021 |
| Combine Software Consultancy Limited | Information & communication | 2016 |
| Come PAN Limited | Administrative & support | 2017 |
| Comestibles International Ltd | Wholesale & retail | 2019 |
| Comfort Acres Ltd | Agriculture & fishing | 2022 |
| Commercial Components (Midlands) Limited | Wholesale & retail | 2014 |
| Commercial Components (Property) Ltd | Wholesale & retail | 2024 |
| Commercial Property (Bournemouth) Limited | Real estate | 2003 |
| Commercial Window Systems Ltd | Construction | 2018 |
| Commission Apostolic Trust Ltd | Other services | 2012 |
| Common Roots Bournemouth CIC | Education | 2024 |
| Commorancy Ltd | Real estate | 2018 |
| Comms Unplugged LLP | | 2018 |
| Communicate Clean Ltd | Administrative & support | 2021 |
| Communications Consultants Worldwide Limited | Information & communication | 2000 |
| Como Associates Holdings Limited | Financial services | 2025 |
| Como Associates Ltd | Real estate | 2019 |
| Companions at Home Limited | Other services | 2017 |
| Company Events 24/7 Limited | Hospitality | 2026 |
| Company Finance House Limited | Financial services | 2018 |
| Compass Business Support Limited | Administrative & support | 2026 |
| Compass Consultancy in Construction Ltd. | Professional & scientific | 2021 |
| Compass Court Management Company Limited | Households | 1990 |
| Complete Accountancy Plus Limited | Professional & scientific | 2001 |
| Complete ARB Services Limited | Administrative & support | 2014 |
| Complete Builds Dorset Ltd | Construction | 2025 |
| Complete Clothes Care 392 Ltd | Other services | 2015 |
| Complete Computer Solutions (South) Limited | Information & communication | 2011 |
| Complete Energy Savings Ltd | Wholesale & retail | 2019 |
| Complete Heating & Cooling Solutions Limited | Construction | 2020 |