| Castle Court RTM Company Limited | Households | 2018 |
| Castle Drylining Limited | Construction | 2000 |
| Castle Exterior Cleaning Limited | Administrative & support | 2025 |
| Castle Investment Limited | Real estate | 2024 |
| Castle Kimberley Property Limited | Households | 2018 |
| Castle Lane DRY Cleaners Ltd | Other services | 2023 |
| Castle Lane Express Ltd | Wholesale & retail | 2025 |
| Castle Lane Nails Spa Limited | Other services | 2013 |
| Castle Lane West Ltd | Real estate | 2015 |
| Castle Parade Fish and Chips Ltd | Hospitality | 2021 |
| Castle Real Solutions Limited | Hospitality | 2019 |
| Castle Realty Limited | Real estate | 2019 |
| Castle Square (Brighton) Limited | Real estate | 2004 |
| Castlefun Limited | Administrative & support | 2003 |
| Castleman Accident Repair & Service Ltd | Wholesale & retail | 2015 |
| Castleman Homes Ltd | Real estate | 2024 |
| Castlesoft IT Services UK Limited | Information & communication | 2016 |
| Catch Digital Limited | Professional & scientific | 2007 |
| Catch the Fire Bournemouth | Other services | 1999 |
| Catch Ventures Limited | Professional & scientific | 2016 |
| Cater-Elite Hospitality Services Ltd | Hospitality | 2020 |
| Catherine Close Management Limited | Households | 2020 |
| Cats Whiskers Day Nursery Ltd | Health & social care | 2026 |
| Cauldwell Holdings Limited | Professional & scientific | 1992 |
| Cauldwell Leisure Limited | Arts & recreation | 2004 |
| Causeway Acquisitions Ltd | Real estate | 2023 |
| Cavalon Ltd | Health & social care | 2024 |
| Cavendean Ltd | Wholesale & retail | 2026 |
| Cavendish Court (Westbourne) RTM Company Limited | Real estate | 2005 |
| Cavendish Court Management (Bournemouth) Limited | Households | 1983 |
| Cavendish Estates Dorset Limited | Real estate | 2013 |
| Cavendish Hall Freehold Limited | Households | 2005 |
| Cavendish Manor Management Company Limited | Households | 1986 |
| Cavendish Place Properties Limited | Households | 2003 |
| Cawte Engineering Ltd | Professional & scientific | 2014 |
| Cawte Flowmeters Limited | Professional & scientific | 2015 |
| Cayena Group Ltd | Wholesale & retail | 2020 |
| Cayena Properties Ltd | Real estate | 2025 |
| Cazobe Limited | Information & communication | 1999 |
| CB Legal Services Ltd | Professional & scientific | 2008 |
| CBE Training Ltd | Education | 2026 |
| CBK Ltd | Construction | 2025 |
| CBR Property Holdings Ltd | Real estate | 2021 |
| Cbrnergetics Holdings Limited | Professional & scientific | 2019 |
| Cbrnergetics Limited | Professional & scientific | 2015 |
| Cbsw Solutions Ltd | Energy | 2021 |
| CC Drylining Limited | Construction | 2014 |
| CC Marketing Group UK Ltd | Professional & scientific | 2026 |
| CC Productions Limited | Information & communication | 2025 |
| CC Roofing and Construction Limited | Construction | 2025 |
| Ccholidays Limited | Hospitality | 2021 |
| CCO Property Solutions Limited | Real estate | 2024 |
| CCS Studios Ltd | Information & communication | 2020 |
| Cctuning Service Ltd | Information & communication | 2019 |
| Cctv Training & Consultancy Services Limited | Administrative & support | 2022 |
| CDC Consulting Ltd | Professional & scientific | 2019 |
| CDC Property Services Ltd | Administrative & support | 2023 |
| CDG Distribution Ltd | Wholesale & retail | 2024 |
| Cecil Heights Management (Bournemouth) Limited | Households | 1988 |
| Cecil Silver Limited | Real estate | 1946 |
| Cecm Consultancy Ltd | Administrative & support | 2024 |
| CED Design Limited | Professional & scientific | 2017 |
| Cedar Lake Ltd | Professional & scientific | 2014 |
| Cedar Lodge (Bournemouth) Limited | Real estate | 2022 |
| Cedar Manor Maintenance Company Limited | Households | 1976 |
| Cedar Trade Services Limited | Wholesale & retail | 2014 |
| Cedars (Branksome Wood) Management Limited(The) | Households | 1985 |
| Cedarwood Carpentry Ltd | Manufacturing | 2019 |
| Cedarwood Residents Management Limited | Real estate | 1999 |
| CEE Tradez Ltd | Other services | 2026 |
| Ceecees's Kitchen Ltd | Hospitality | 2026 |
| Ceecee’S World Ltd | Other services | 2025 |
| Celc Limited | Education | 2010 |
| Celest Homes Ltd | Real estate | 2023 |
| Celev Sewing & Alterations Ltd | Other services | 2022 |
| Cell Synergy Ltd | Other services | 2023 |
| Cena Italian Ltd | Hospitality | 2014 |
| Cengizhan Ltd | Real estate | 2024 |
| Cent Global Ltd | Health & social care | 2023 |
| Central College for Education Limited | Education | 2016 |
| Central DRY Cleaners Bmth Limited | Other services | 2026 |
| Centralia Ltd | Wholesale & retail | 2020 |
| Centre Point AV Limited | Information & communication | 2005 |
| Centre VR Limited | Information & communication | 2017 |
| Century Cleaning Limited | Administrative & support | 1997 |
| Cerberus Organic Dog Food Ltd | Manufacturing | 2018 |
| Cernago Limited | Professional & scientific | 2021 |
| Cerne Abbas Residents' Association Limited(The) | Households | 1986 |
| Cerne Estates Limited | Real estate | 2023 |
| Ceto Cloud Ltd | Information & communication | 2026 |
| Ceto Group Ltd | Information & communication | 2014 |
| Ceto Marine Ltd | Manufacturing | 2024 |
| Ceto Systems Ltd | Information & communication | 2026 |
| Ceto Technology Ltd | Information & communication | 2026 |
| Ceyhan Cars Ltd | Transport & logistics | 2016 |
| CF Asset Group Ltd | Financial services | 2026 |
| CF Asset Management Ltd | Real estate | 2026 |
| CF Bmouth Ltd | Arts & recreation | 2012 |
| CF Squared Limited | Professional & scientific | 2026 |
| Cfhl Consultancy Limited | Professional & scientific | 2025 |