| Colin Nash Restaurant Ltd | Hospitality | 2023 |
| Colin Williams Consultancy Ltd | Professional & scientific | 2022 |
| Collar & Coat Ltd | Other services | 2025 |
| Collate Business Systems Ltd. | Wholesale & retail | 1991 |
| Colman Court Freehold Limited | Households | 2002 |
| Colourstone Resin Ltd | Construction | 2023 |
| Colten Care (1693) Limited | Health & social care | 2008 |
| Colten Care (1993) Limited | Health & social care | 2008 |
| Colten Care (2003) Limited | Health & social care | 2008 |
| Colten Care (2009) Limited | Health & social care | 2011 |
| Colten Care (Construction) Limited | Extraterritorial | 2008 |
| Colten Care Limited | Health & social care | 1988 |
| Colten Developments Limited | Construction | 1971 |
| Colten Land Limited | Professional & scientific | 2018 |
| Committed to Content Ltd | Information & communication | 2017 |
| Compare Business Electricity Limited | Wholesale & retail | 2006 |
| Compare Pet Fees Ltd | Professional & scientific | 2026 |
| Compass & Bonita Limited | Wholesale & retail | 2025 |
| Compass Women's Wellbeing CIC | Health & social care | 2025 |
| Complete Book-Keeping Limited | Professional & scientific | 2008 |
| Complete Plastics Solutions Ltd | Construction | 2014 |
| Compuserve Services Ltd | Information & communication | 2015 |
| Comsci Ltd | Information & communication | 1990 |
| Concept UK Clubs Limited | Arts & recreation | 2015 |
| Concise Fabrications Limited | Manufacturing | 2016 |
| Condor Consulting Services Ltd | Professional & scientific | 2023 |
| Conifer Court (Westby Road) Management Ltd | Real estate | 2005 |
| Conjure Ltd | Information & communication | 2009 |
| Connect Business Technology Limited | Manufacturing | 1996 |
| Connetika Limited | Other services | 2019 |
| Construction Support Services Limited | Construction | 2009 |
| Consultancy Global Limited | Professional & scientific | 2025 |
| Content Ignite Holdings Limited | Financial services | 2018 |
| Content Ignite Limited | Information & communication | 2014 |
| Content With Olivia Ltd | Information & communication | 2023 |
| Contos Consulting Ltd | Professional & scientific | 2021 |
| Contractor Confidence Limited | Information & communication | 2025 |
| Copperleaf Technologies UK Limited | Information & communication | 2020 |
| Core Minutes Ltd | Professional & scientific | 2014 |
| Cork & Board Ltd | Hospitality | 2024 |
| Corporate Breaks Ltd | Information & communication | 2020 |
| Corporate Pension and Trustee Services Limited | Professional & scientific | 2018 |
| Cortex Solutions (UK) Limited | Information & communication | 2006 |
| Cosy Pet Limited | Extraterritorial | 2021 |
| Cottees Management Limited | Households | 2020 |
| Coulomb Group Limited | Arts & recreation | 2022 |
| Cowling Commercial Ltd | Real estate | 2025 |
| CQC Compliance Consultants Ltd | Professional & scientific | 2023 |
| Craftwood UK Interiors Limited | Manufacturing | 2025 |
| Crafty Solutions Limited | Information & communication | 2015 |
| Craigkwest Limited | Information & communication | 2014 |
| Cramcrest Limited | Real estate | 1990 |
| Cratci Restaurants Ltd | Hospitality | 2024 |
| Crazy Tails Limited | Other services | 2019 |
| Creamcow Ltd | Information & communication | 2026 |
| Create Gift Love Ltd | Other services | 2011 |
| Creation Projects Ltd | Professional & scientific | 2009 |
| Creative Building Limited | Construction | 2002 |
| Crescent Court (Boscombe) Management Co. Ltd. | Households | 1994 |
| Crescent House Management (Bournemouth) Limited | Households | 1986 |
| Crete Paving and Design Ltd | Construction | 2021 |
| Croft Homes (Poole) Limited | Construction | 1996 |
| Crooze Control Ltd | Transport & logistics | 2014 |
| Cross Pennine Limited | Administrative & support | 2003 |
| Crow Farm Shop Ltd | Wholesale & retail | 2022 |
| Crow Hill Top Apartments Ltd | Households | 2022 |
| Crown Fit-Out & Refurbishment Ltd | Construction | 2020 |
| Crown House Lettings and Property Management Ltd | Real estate | 2018 |
| Crystalpoint Investments Limited | Administrative & support | 2015 |
| Ctgkw Limited | Real estate | 2024 |
| Curlicue Ltd | Professional & scientific | 2014 |
| Curtis Carpentry & Build Ltd | Construction | 2026 |
| Cutting IT Vine Ltd | Wholesale & retail | 2020 |
| CV Commercial Developments Limited | Other services | 2014 |
| CV Developments Limited | Real estate | 2013 |
| CW Stay Solutions Ltd | Real estate | 2025 |
| Cyberkeyz Ltd | Wholesale & retail | 2019 |
| Cycle Rescue Ltd | Wholesale & retail | 2016 |
| D & M Moule Tree Care Ltd | Agriculture & fishing | 2015 |
| D Bryant Ltd | Administrative & support | 2018 |
| D Coutts Engineering Limited | Professional & scientific | 2024 |
| D G Booth Ltd | Financial services | 2017 |
| D G Flowers Limited | Wholesale & retail | 2025 |
| D H Tiling Ltd | Construction | 2023 |
| D R Smith Properties Group Limited | Extraterritorial | 2011 |
| D R Smith Properties Limited | Real estate | 2011 |
| D T Goodall Property Ltd | Real estate | 2024 |
| D W S Drainage & Water Specialist Ltd | Other services | 2022 |
| D.D Bars Ltd | Administrative & support | 2009 |
| D.G. Wholesale Flowers Limited | Wholesale & retail | 2005 |
| D.J. Short Brickwork Limited | Construction | 1997 |
| D.J.Turner Electrical Services Ltd | Manufacturing | 2020 |
| D.R.W Electrical Ltd | Construction | 2014 |
| Daawat Ringwood Ltd | Hospitality | 2024 |
| DAL Strategy Limited | Public administration | 2012 |
| Dalkeith Assets Limited | Real estate | 2022 |
| Danfoss Power Solutions II Ltd | Manufacturing | 2020 |
| Daren Dukan Limited | Other services | 2024 |
| Datasim Limited | Administrative & support | 2009 |
| Datum Design and Build Limited | Energy | 2017 |