| C & J Denson Ltd | Other services | 2021 |
| C & L Housing Limited | Real estate | 2021 |
| C & S Trading Services Limited | Wholesale & retail | 2015 |
| C C Contract Flooring Limited | Construction | 2006 |
| C Horne Limited | Construction | 2012 |
| C M C Quality Services Limited | Administrative & support | 2014 |
| C P Industrial Cleaning Equipment and Services Ltd | Other services | 2025 |
| C Pack Group Holdings Ltd | Financial services | 2026 |
| C Pack Packaging Machinery Limited | Administrative & support | 2002 |
| C Pack Pendle Limited | Manufacturing | 2008 |
| C R Limited | Construction | 2000 |
| C R Pallets Limited | Water & waste | 2016 |
| C Sanderson & SON Limited | Construction | 2015 |
| C T Xperience Ltd | Wholesale & retail | 2014 |
| C&C Manufacturing Limited | Manufacturing | 2015 |
| C&M Scaffolding Ltd | Construction | 2026 |
| C.E. King Holdings Ltd | Manufacturing | 2020 |
| C.P.C. Property & Gardening Services Ltd | Construction | 2002 |
| C.R. Large Contractors Ltd | Construction | 2018 |
| C.S. Brunt (Freight Services) Limited | Transport & logistics | 1985 |
| C2-UK Communications Limited | Information & communication | 2003 |
| Caeruleum Projects Ltd | Professional & scientific | 2011 |
| CAG Lifting Limited | Construction | 2018 |
| Caistor Distribution Limited | Transport & logistics | 1994 |
| Cake (Dent) Limited | Real estate | 2025 |
| CAL Amusements Ltd | Professional & scientific | 2025 |
| Calder Green Management Company Limited | Real estate | 2013 |
| Calder Valley Scaffolding Ltd | Construction | 2026 |
| Calder Works Limited | Real estate | 2014 |
| Calderprint Pinnacle Limited | Professional & scientific | 2012 |
| Caldervale Car Sales Limited | Professional & scientific | 2017 |
| Calibre Heating Limited | Construction | 2026 |
| Calico Enterprise Limited | Health & social care | 2007 |
| Calico Homes Limited | Real estate | 1999 |
| Calico Housing Ltd | Extraterritorial | 2009 |
| Calndt Ltd | Professional & scientific | 2021 |
| Caltye PUB Co Ltd | Hospitality | 2015 |
| Calverley's Timber Products Limited | Water & waste | 1977 |
| Calvert Bateson Limited | Real estate | 2021 |
| Calyx Drinks Ltd | Manufacturing | 2015 |
| Cambridge Kitchens Limited | Wholesale & retail | 2003 |
| Cambridge Superstore Limited | Wholesale & retail | 2019 |
| Camlau Limited | Manufacturing | 1998 |
| Canal Walk Holdings Ltd | Arts & recreation | 2026 |
| Canalside Academy CIC | Education | 2021 |
| Canalside Solutions Limited | Extraterritorial | 2009 |
| Canopy (TWH) Ltd | Wholesale & retail | 2020 |
| Capital Developments & Construction Ltd | Construction | 2023 |
| Capll Lotteries Limited | Information & communication | 2020 |
| Capll Ltd | Information & communication | 2009 |
| Capsule Group Ltd | Financial services | 2025 |
| Capturemast Ltd | Wholesale & retail | 2023 |
| Car Monkey Garage Limited | Wholesale & retail | 2026 |
| Car Outlet-Uk Ltd | Wholesale & retail | 2022 |
| Car Sales Centre Ltd | Wholesale & retail | 2025 |
| Car Spa Norfolk Ltd | Administrative & support | 2024 |
| Caravan Rentals Ltd | Administrative & support | 2024 |
| Carden & Godfrey Limited | Professional & scientific | 1997 |
| Care and Community Ltd | Health & social care | 2008 |
| Care Direct Lancashire Ltd. | Wholesale & retail | 2012 |
| Careanaesthesia Limited | Health & social care | 2012 |
| Carefit in the Community CIC | Arts & recreation | 2026 |
| Carefit Ltd | Other services | 2025 |
| Caregenics Healthcare Limited | Public administration | 2020 |
| Caritas Healthcare Limited | Health & social care | 2022 |
| Carl Keith Salons Limited | Other services | 1999 |
| Carleton Glen SL 2 Ltd | Real estate | 2025 |
| Carleton Glen SL 3 Ltd | Real estate | 2025 |
| Carleton Glen SL 4 Ltd | Real estate | 2025 |
| Carleton Glen SL 5 Ltd | Real estate | 2025 |
| Carolina Hot Food Limited | Hospitality | 2024 |
| Carter Fabrications Limited | Manufacturing | 1998 |
| Carter Law LLP | | 2009 |
| Cartmels Hair & Beauty Ltd. | Professional & scientific | 2018 |
| CARVAN4U Ltd | Wholesale & retail | 2025 |
| Casa Homes Ltd | Real estate | 2022 |
| CASH4CARZ.ORG Ltd | Wholesale & retail | 2019 |
| Cashew Homes Ltd | Real estate | 2021 |
| Cassie's D & a Services Ltd | Health & social care | 2020 |
| Castle Mount Contracts Limited | Construction | 1999 |
| Castle Packers Ltd | Administrative & support | 2015 |
| Castle Self Store Ltd | Wholesale & retail | 2015 |
| Castle Testing and Safety Services Ltd | Professional & scientific | 2024 |
| Castlerigg Ceramics Ltd | Construction | 2003 |
| Casual Minds Matter C.I.C. | Wholesale & retail | 2022 |
| Cater My Event Ltd | Hospitality | 2017 |
| Catering Supplies Wholesale UK Ltd | Wholesale & retail | 2022 |
| CAW & Co Ltd | Construction | 2018 |
| CB Technical Services (UK) Ltd | Water & waste | 2007 |
| Cbee-Services.Srl Ltd | Other services | 2025 |
| Cbmechanicalhandling Limited | Manufacturing | 2017 |
| Cbor Ltd | Construction | 2021 |
| CBS Solutions Ltd | Information & communication | 2014 |
| Ccfarvision Ltd | Real estate | 2022 |
| Cctv Systems Services Ltd | Administrative & support | 2021 |
| CDF Mortgages Ltd | Financial services | 2023 |
| CDM Holdings (Blackburn) Limited | Administrative & support | 2009 |
| CDS Property NW Ltd | Construction | 2026 |
| CEE Cee’S Cocktail Bar Ltd | Hospitality | 2025 |
| Cega Limited | Hospitality | 2009 |