| Centaurus a' Limited | Information & communication | 2013 |
| Central Surfacing Limited | Construction | 2025 |
| Ceunant Automotive Limited | Professional & scientific | 2012 |
| CG Remaps Limited | Professional & scientific | 2020 |
| Chadswell Limited | Professional & scientific | 2014 |
| Charles Wellon Mechanical Services Limited | Manufacturing | 2014 |
| Charley's Car Sales Limited | Wholesale & retail | 2018 |
| Charter Resource Limited | Professional & scientific | 1996 |
| Chatha Brothers Ltd | Real estate | 2021 |
| Cherian George Ltd | Health & social care | 2017 |
| Chester City Transport Ltd | Extraterritorial | 2026 |
| Chetwode (Trading) Ltd | Hospitality | 2019 |
| Chipnall Holdings Limited | Financial services | 2019 |
| Chridam Ltd | Information & communication | 2017 |
| Chris Dale Heating Ltd | Construction | 2024 |
| Chris Evans Farm Services Ltd | Manufacturing | 2012 |
| Chris Fennell Appliance Repairs Limited | Other services | 2018 |
| Church Reform Group | Other services | 2015 |
| Cici’S Happy Ever After Ltd | Wholesale & retail | 2021 |
| CK Solars & Roofing Limited | Construction | 2012 |
| Cladded Campers Ltd | Manufacturing | 2021 |
| Clapton Holdings Limited | Financial services | 2019 |
| Clarity in Numbers Limited | Professional & scientific | 2018 |
| Clark & Kent Contractors Limited | Construction | 2026 |
| Clark & Kent Contracts Limited | Administrative & support | 2013 |
| Classic Racing Cars Historic Motorsport Ltd | Wholesale & retail | 2015 |
| Clay & Sheldon Properties Limited | Other services | 2024 |
| Clean Energy Services Limited | Manufacturing | 1999 |
| Cleanfix Property Services Ltd | Administrative & support | 2024 |
| Clear Day Limited | Health & social care | 2006 |
| Clear Waters Investments Limited | Financial services | 2018 |
| Clearance Outlet MD Ltd | Wholesale & retail | 2018 |
| Click and Protect Limited | Professional & scientific | 2021 |
| Clifford Talbot Holdings Limited | Financial services | 2020 |
| Clifford Talbot Limited Liability Partnership | | 2004 |
| Clive and Coffyne Ltd | Hospitality | 2024 |
| Clive Park Management Limited | Households | 2007 |
| Club Radicool Ltd | Other services | 2024 |
| Coalbrook Holdings Limited | Financial services | 2018 |
| Cognita Communications Limited | Professional & scientific | 2014 |
| Colin Molton Consultancy Ltd | Information & communication | 2017 |
| Colourful Consultant Limited | Wholesale & retail | 2016 |
| Commercial Purchasing Ltd | Hospitality | 2016 |
| Compact Surfacing Limited | Extraterritorial | 2017 |
| Compass Solutions Ltd | Information & communication | 2004 |
| CONNECT11 Ltd | Information & communication | 2024 |
| Cooke & Thomas Limited | Wholesale & retail | 2013 |
| Cooper Lettings MD Ltd | Real estate | 2026 |
| Cooper Poole Ltd | Construction | 2009 |
| Coopers 2013 Limited | Administrative & support | 2013 |
| Cope Farming Limited | Agriculture & fishing | 2020 |
| Corner Cars Ltd | Wholesale & retail | 2021 |
| Corrib Holdings Limited | Professional & scientific | 2023 |
| Coverwell Holdings Ltd | Real estate | 2021 |
| Coverwell Insurance Brokers Limited | Financial services | 2017 |
| Craig Brown Wrong Fuel Recovery Limited | Wholesale & retail | 2012 |
| Cranage (Sales) Limited | Manufacturing | 1993 |
| Cranage EMC Technology Limited | Manufacturing | 1991 |
| Cranage EMC Testing Limited | Professional & scientific | 1992 |
| Creating ME Ltd | Other services | 2024 |
| Crideford Holdings Ltd | Real estate | 2024 |
| Crin Cottage Limited | Hospitality | 2012 |
| Crossland Trucks Limited | Manufacturing | 2022 |
| Crown Mews (Newport) Management Company Limited | Households | 2008 |
| Crystil Engineering Limited | Other services | 2003 |
| CS Lettings & Sales Ltd | Real estate | 2021 |
| CSB Architecture Ltd | Professional & scientific | 2010 |
| Cscsp Ltd | Professional & scientific | 2021 |
| Culina Group Limited | Professional & scientific | 2005 |
| Culina Logistics Limited | Transport & logistics | 2004 |
| Curious Raven Ltd. | Agriculture & fishing | 2022 |
| CW Private Holdings Ltd | Real estate | 2026 |
| D & D Major Limited | Other services | 2003 |
| D & H Trever Dance Promotions Limited | Other services | 2015 |
| D C Coaches Ltd | Transport & logistics | 2014 |
| D Cliff Developments Ltd | Construction | 2020 |
| D Cliff Limited | Real estate | 2018 |
| D E & S E Furnival Limited | Agriculture & fishing | 2005 |
| D J Pink Construction Ltd | Construction | 2015 |
| D J Pink Holdings Limited | Financial services | 2019 |
| D W Eardley Limited | Agriculture & fishing | 2012 |
| D. Grove Plastering Ltd | Construction | 2003 |
| D.H. Car & Commercial Limited | Wholesale & retail | 2005 |
| D2 Plant & Agriculture Ltd | Agriculture & fishing | 2020 |
| Dace Property Investments Rentals & Sales Company Limited | Real estate | 2018 |
| Dafno Ltd | Transport & logistics | 2016 |
| DAH Poultry Services Limited | Agriculture & fishing | 2004 |
| Daisy Dusters Ltd | Administrative & support | 2019 |
| Daleland Stores Ltd | Wholesale & retail | 2021 |
| Danimax Ltd | Professional & scientific | 2019 |
| Danny Clews Construction Limited | Construction | 2011 |
| Danzar Foods Ltd. | Hospitality | 2010 |
| Dartsam Ltd | Professional & scientific | 2008 |
| Datchworths Limited | Administrative & support | 1982 |
| Dave Loughnane Racing Limited | Agriculture & fishing | 2020 |
| David Bagshaw Limited | Construction | 1986 |
| David Bishop Travel Counsellor Ltd | Administrative & support | 2017 |
| David Evans Global Limited | Professional & scientific | 2023 |
| David Hine Limited | Administrative & support | 2022 |
| David Hine Property Limited | Real estate | 2024 |