| C.Q.P.S. Ltd. | Wholesale & retail | 2014 |
| C.R.T. Plant Engineers Limited | Mining & quarrying | 1988 |
| C.T.D. News Limited | Wholesale & retail | 1978 |
| C.W. Plant Hire Limited | Construction | 1974 |
| C11 Limited | Real estate | 2020 |
| C2 Hair Design (Breaston) Limited | Health & social care | 2010 |
| C2-FEA Capital Ltd | Real estate | 2025 |
| C2C Traders Limited | Wholesale & retail | 2016 |
| C2C Training Limited | Education | 2013 |
| Ca-Healthcare Ltd | Administrative & support | 2012 |
| CAA Growth Limited | Real estate | 2023 |
| CAA Stays Limited | Real estate | 2023 |
| CAA Third Limited | Administrative & support | 2023 |
| Cabella Hair Hub Ltd | Information & communication | 2024 |
| Cabello Limited | Other services | 2000 |
| Cabin Fever Games Ltd | Information & communication | 2024 |
| Cable Doctors Ltd | Manufacturing | 2026 |
| Caboodall Limited | Wholesale & retail | 2023 |
| CAD for Fashion Ltd. | Professional & scientific | 2018 |
| Cadence Construction Management Ltd | Professional & scientific | 2021 |
| Cadence Properties Ltd | Real estate | 2019 |
| Cadet (Eco) Ltd | Agriculture & fishing | 2021 |
| Cadley Cauldwell Estate Agents Limited | Real estate | 2009 |
| Cadogan Consultancy Limited | Professional & scientific | 2015 |
| Cadogan Management Limited | Professional & scientific | 2015 |
| Cafe & Snooker Place Ltd | Hospitality | 2025 |
| Cafe 159 Limited | Administrative & support | 2026 |
| Cafe Bake Ltd | Hospitality | 2016 |
| Cafeblanc Coffee House Limited | Hospitality | 2025 |
| Caffeine 88 Limited | Arts & recreation | 2010 |
| Caffrey's Plastering Limited | Construction | 2018 |
| Caft Solar Limited | Wholesale & retail | 2025 |
| Café Rosa Derbion Ltd | Hospitality | 2022 |
| Caged Bear Property Ltd | Real estate | 2021 |
| Cahilig’S Best Ltd | Hospitality | 2025 |
| Cairn Place Limited | Real estate | 2017 |
| Caklov Ltd | Transport & logistics | 2019 |
| Cako Luxe Beauty Hub Limited | Other services | 2026 |
| CAL Property Holdings Ltd | Real estate | 2022 |
| Calaway Services Limited | Construction | 2019 |
| Caldwells Roofing Services Ltd | Construction | 2026 |
| Calesa Construction Ltd | Construction | 2026 |
| Calesa Developments Holdings Ltd | Financial services | 2025 |
| Calesa Developments Ltd | Construction | 2025 |
| Calfreest Limited | Construction | 2009 |
| Calibrate Compliance Limited | Professional & scientific | 2016 |
| California Nails TD Ltd | Other services | 2026 |
| Calimber Ltd | Information & communication | 2026 |
| Call Clean Limited | Administrative & support | 2009 |
| Calla Aesthetics Limited | Health & social care | 2008 |
| Callaz Investments Ltd | Construction | 2024 |
| Callow Capital Ltd | Professional & scientific | 2017 |
| Callum-Westwood Ltd | Households | 2025 |
| Calm Business Enterprise Ltd. | Real estate | 2023 |
| Calma Spaces Limited | Manufacturing | 2024 |
| Calste Solutions Limited | Administrative & support | 2018 |
| Calwich Manor Estate LLP | | 2015 |
| CAM Hoss Group Holdings Ltd | Financial services | 2025 |
| Cambridge Convenience Store Limited | Wholesale & retail | 2021 |
| Cambridge Medicare Limited | Manufacturing | 2025 |
| Camden Court (MC) Limited | Real estate | 2019 |
| Camder FC C.I.C. | Education | 2023 |
| Camdexs Ltd | Construction | 2023 |
| Camdown Consulting Limited | Professional & scientific | 2015 |
| Came UK Limited | Administrative & support | 1996 |
| Cameo Investments Limited | Real estate | 1960 |
| Cameron Hall Engineering Limited | Manufacturing | 2017 |
| Cameron Projects Ltd | Construction | 2019 |
| Cameroon Community Development Centre CIC | Education | 2026 |
| Camille Lingerie Limited | Wholesale & retail | 2008 |
| Camper Ventures Ltd | Wholesale & retail | 2024 |
| Camps Oak Ltd | Hospitality | 2019 |
| Canaan Properties Management Limited | Real estate | 2022 |
| Canal Craft Ltd | Manufacturing | 2007 |
| Canary (Eco) Ltd | Agriculture & fishing | 2021 |
| Candii Screening Limited | Information & communication | 2025 |
| Candor Homes Limited | Real estate | 2024 |
| Candor Services Limited | Wholesale & retail | 1981 |
| Candour Realty Limited | Administrative & support | 2022 |
| Canfield (Coptic Street) Limited | Construction | 1999 |
| Canfield Freehold 151 Limited | Real estate | 2018 |
| Canfield Freehold Limited | Construction | 1996 |
| CANM8 Limited | Extraterritorial | 2008 |
| Cannadoo Ltd | Wholesale & retail | 2017 |
| Canning Property LLP | | 2024 |
| Cannoncraft Limited | Manufacturing | 1999 |
| Canoe.Blue Limited | Wholesale & retail | 2024 |
| Canopia Ltd | Agriculture & fishing | 2026 |
| Canopy Crest Ltd | Agriculture & fishing | 2026 |
| Canopy Propertyco Limited | Real estate | 2025 |
| Canopy Vale Ltd | Agriculture & fishing | 2026 |
| Canvalia Ltd | Manufacturing | 2023 |
| CAO Construction Ltd | Construction | 2020 |
| Capall Tax Ltd | Professional & scientific | 2021 |
| Capallini LLP | | 2006 |
| Cape Cove Properties Limited | Real estate | 2019 |
| Cape to Cairo Ltd | Wholesale & retail | 2012 |
| Capewell-Moran Limited | Wholesale & retail | 2024 |
| Capital Data (Emea) Limited | Information & communication | 2018 |
| Capital M Events Limited | Other services | 2012 |