| Cherry Brickwork Contractors Limited | Construction | 2018 |
| Cheshire Business Park Management Company Limited | Real estate | 2007 |
| Chestnut Joinery Services Limited | Construction | 2025 |
| Chestnut Lodge (Harrogate Road) Management Company Limited | Households | 2021 |
| Chew PR Limited | Professional & scientific | 2015 |
| Chicken Stop Hoyland Ltd | Hospitality | 2024 |
| Childhood PR Ltd | Administrative & support | 2019 |
| Chilledwine Ltd | Wholesale & retail | 2025 |
| Chilli & Grille Limited | Hospitality | 2022 |
| Chilli Chatkara Ltd | Hospitality | 2025 |
| Chilli Lodge Barnsley Limited | Hospitality | 2019 |
| Chillilodge S/C Ltd | Hospitality | 2024 |
| Chimborazo Limited | Real estate | 2002 |
| China Garden (Barnsley) Limited | Hospitality | 2021 |
| China Lantern Limited | Hospitality | 2021 |
| China Palace ( Barnsley) Limited | Hospitality | 2023 |
| Chique Hair & Beauty Ltd | Other services | 2022 |
| Chirmarn Holdings Limited | Construction | 2003 |
| Chiropractic Centre Limited | Health & social care | 2003 |
| CHL Coffee Ltd | Wholesale & retail | 2025 |
| Chloe Nails 9 Ltd | Other services | 2023 |
| Choice Holdings and Investments Limited | Real estate | 2024 |
| Choice Teachers (South) Ltd | Administrative & support | 2012 |
| Choice Teachers Limited | Administrative & support | 2007 |
| Choices Homecare (Calderdale) Limited | Health & social care | 2000 |
| Choices Homecare (Holdings) Limited | Health & social care | 2024 |
| Choices Homecare (Lancs) Limited | Health & social care | 1996 |
| Choices Homecare (Merseyside) Limited | Health & social care | 2002 |
| Choices Homecare (Oldham) Limited | Health & social care | 2011 |
| Choices Homecare (South Yorks) Limited | Health & social care | 2005 |
| Choices Homecare (Yorkshire) Limited | Health & social care | 1999 |
| Chorlton Ryan Limited | Real estate | 2019 |
| Chris Andrews Ceramics Limited | Construction | 2001 |
| Chris Beal VT Ltd | Information & communication | 2023 |
| Chris Mcgee Ltd | Other services | 2022 |
| Chris Wright Consultancy Ltd | Construction | 2026 |
| Christian Spencer Leisure Limited | Hospitality | 2002 |
| Christopher Neil White Ltd | Wholesale & retail | 2018 |
| Chrysalis Professional Ltd | Health & social care | 2023 |
| Chuckle Ventures Ltd | Real estate | 2024 |
| Church Hill Business Systems Ltd | Information & communication | 2025 |
| Church Road Dentist Limited | Health & social care | 2023 |
| Church Tower View Management Limited | Professional & scientific | 2006 |
| Church View Children's Place Limited | Health & social care | 2025 |
| Churchfield Construction Limited | Construction | 2010 |
| CID Couriers Limited | Transport & logistics | 2014 |
| Cidon Construction Limited | Construction | 2000 |
| Cidon Contracts Limited | Administrative & support | 2004 |
| Cidon Group (UK) Limited | Professional & scientific | 2013 |
| Cidon Holdings Limited | Extraterritorial | 2016 |
| Cipherid Holdings Limited | Financial services | 2017 |
| Ciphertravel Limited | Households | 1986 |
| Circle Engineering Ltd | Administrative & support | 2023 |
| Circle Life Sciences Ltd | Administrative & support | 2023 |
| Circle Select Limited | Administrative & support | 2023 |
| Circle Staffing Foods Ltd | Administrative & support | 2023 |
| CIS Estates Ltd | Real estate | 2018 |
| Cities of Culture Consulting Ltd | Professional & scientific | 2025 |
| CITRUS24 Property Developments Ltd | Real estate | 2023 |
| City Salon (Barnsley) Limited | Other services | 2020 |
| Citypet Lubricants UK Ltd | Wholesale & retail | 2019 |
| CJ Energy Solutions Limited | Construction | 2025 |
| CJ Entertainment (Barnsley) Ltd | Arts & recreation | 2024 |
| CJ Taylor Property Ltd | Real estate | 2026 |
| Cj&A Installations Limited | Construction | 2008 |
| Cjep Electrical Limited | Construction | 2026 |
| CJI Electrical Limited | Construction | 2026 |
| CJN Property Maintenance Limited | Construction | 2020 |
| Cjpf Consulting Ltd | Professional & scientific | 2024 |
| CJS Civils Ltd | Construction | 2025 |
| CJS Travel North East Limited | Transport & logistics | 2025 |
| CJW Business Services Ltd | Administrative & support | 2019 |
| CK Beckett Metals Limited | Water & waste | 2019 |
| CK Beckett OIL Processing 2017 Ltd | Water & waste | 2017 |
| CK Beckett Transformers & Switchgear 2017 Ltd | Manufacturing | 2017 |
| CL Holdings and Developments Ltd | Real estate | 2024 |
| Claire Firth Limited | Hospitality | 2025 |
| Clamp Golf Limited | Manufacturing | 2022 |
| Clarity Postmortem Enterprise Limited | Financial services | 2026 |
| Clarity Postmortem Imaging Limited | Health & social care | 2025 |
| Clarke (Reclaim) Limited | Wholesale & retail | 1984 |
| Clarke Film and Media Ltd | Information & communication | 2017 |
| Clarke Transport (1986) Limited | Information & communication | 1986 |
| Clarky the Sparky Ltd | Construction | 2016 |
| Classa Hairsay Limited | Wholesale & retail | 2010 |
| Classic Motor Auctions Limited | Financial services | 2024 |
| Classic Properties Limited | Real estate | 2009 |
| Classic Turntable Company Limited | Other services | 2012 |
| Claycliffe Cafe Ltd | Hospitality | 2026 |
| Claycliffe Holdings Limited | Real estate | 2026 |
| Claycliffe Office Park Management Limited | Administrative & support | 2006 |
| Claydon Accountancy Limited | Professional & scientific | 2013 |
| Claydon Hardy Associates Limited | Extraterritorial | 2017 |
| Clayton Professional Wealth Ltd | Professional & scientific | 2018 |
| Clayworth Limited | Wholesale & retail | 1990 |
| CLB Social Care Limited | Health & social care | 2016 |
| CLD Pipe and Mechanical Services Limited | Professional & scientific | 2016 |
| Clean Energy Gurus Limited | Energy | 2026 |
| Clean Fresh Tran Limited | Transport & logistics | 2024 |
| Clean-Slate Developments Ltd | Construction | 2023 |