| Castleton Road Garage Limited | Wholesale & retail | 2008 |
| CASUALS@143 Ltd | Wholesale & retail | 2021 |
| Cataleya Solutions Ltd | Other services | 2023 |
| Catartes.Aniastudio Limited | Manufacturing | 2023 |
| Catchpole Commercial Ltd | Professional & scientific | 2011 |
| Category One Sales & Marketing Ltd | Professional & scientific | 2021 |
| Caterbay Limited | Wholesale & retail | 2006 |
| Catering Partnership Limited | Manufacturing | 2015 |
| Cath Hitchen Consultancy Ltd | Administrative & support | 2011 |
| Catherine Jane Associates Ltd | Administrative & support | 2016 |
| Cathrow Consultancy Ltd | Information & communication | 2025 |
| Cats Online Limited | Wholesale & retail | 2022 |
| Catterall Lodge Court Management Company Limited | Households | 2020 |
| Caturra Coffee Ltd | Wholesale & retail | 2020 |
| Caunce Buildings Limited | Construction | 2024 |
| Caunce Holdings Limited | Real estate | 1972 |
| Cavalier Products Limited | | 1981 |
| Cavanagh Commercial Holdings Limited | Financial services | 2020 |
| Cavanagh Property Holdings Limited | Financial services | 2020 |
| Cavity Extraction and Building Services Ltd | Construction | 2025 |
| Cavo Poulton Ltd | Hospitality | 2025 |
| Cavvalure Limited | Wholesale & retail | 2024 |
| Cayuga Lake Limited | Extraterritorial | 2007 |
| CB Consultancy Services Limited | Professional & scientific | 2015 |
| CB Machinery Services Ltd | Other services | 2024 |
| Cbcalv LLP | | 2024 |
| Cbdocs Ltd | Wholesale & retail | 2019 |
| CBG Advisory Limited | Administrative & support | 2005 |
| CBG Purchasing Limited | Professional & scientific | 2021 |
| CBS Sealants Ltd | Construction | 2021 |
| CC Event Consulting Limited | Arts & recreation | 2014 |
| CC Metalcraft Ltd | Manufacturing | 2022 |
| CCA Projects Limited | Real estate | 2018 |
| Ccab Media Limited | Wholesale & retail | 2012 |
| CCE Digital Solutions Limited | Professional & scientific | 2024 |
| CCE Vogel Ltd | Real estate | 2013 |
| CCH Joinery (Preston) Limited | Construction | 2013 |
| CCM Group Holdings Ltd | Financial services | 2024 |
| CCN International Ltd | Professional & scientific | 2016 |
| CCO Building Consultancy Limited | Professional & scientific | 2003 |
| Ccos(Uk) Ltd | Wholesale & retail | 2024 |
| Cctvstores Limited | Extraterritorial | 2007 |
| CD & T LLP | | 2013 |
| CD Birch Contractors Ltd | Construction | 2017 |
| CD Gifts and Awards Limited | Manufacturing | 2016 |
| CD Paving Limited | Other services | 2016 |
| CDA Glazing Ltd | Construction | 2021 |
| Cddd Limited | Hospitality | 2019 |
| CDF Motors Limited | Wholesale & retail | 2018 |
| CDL Core Ltd | Water & waste | 2026 |
| CDL Media Limited | Information & communication | 2016 |
| CDL Metal Recycling Limited | Wholesale & retail | 2026 |
| CDL Recycling Ltd | Wholesale & retail | 2026 |
| CDM Kitchen & Bathrooms Limited | Construction | 2022 |
| CDM Site Services Ltd | Construction | 2025 |
| CDM Stainless Ltd | Construction | 2013 |
| Cdms Solutions (UK) Ltd | Construction | 2012 |
| Cdsd Bloxwich Ltd | Real estate | 2025 |
| CDSDR2R001 Limited | Real estate | 2024 |
| CDYOUNG1987 Ltd | Transport & logistics | 2025 |
| CE Landscape Design Limited | Administrative & support | 2010 |
| Cece and TED Ltd | Wholesale & retail | 2021 |
| Cecil James Limited | Construction | 2014 |
| Cedar Estates NW Limited | Real estate | 2014 |
| Cedar Foods Limited | Administrative & support | 2015 |
| Cedar Path Care LLP | | 2024 |
| Cedar Path Holdings Ltd | Real estate | 2025 |
| Cedar Path Ltd | Health & social care | 2025 |
| Cedar Property NW Ltd | Real estate | 2023 |
| Cedar Stone Homes Ltd. | Construction | 2004 |
| Cedar Tree Building Services Ltd | Construction | 2026 |
| Cedar Tree Pads Ltd | Real estate | 2015 |
| Cedarland Property Management Limited | Real estate | 2020 |
| Cedarwood Coffee Company Limited | Hospitality | 2014 |
| Cedarwood Holding Ltd | Real estate | 2018 |
| CEI Supply Solutions Limited | Administrative & support | 2014 |
| Ceiling Designs Limited | Construction | 2024 |
| CEJ Geotech Limited | Professional & scientific | 2012 |
| CEL Properties Limited | Financial services | 2022 |
| Celebrated NOT Tolerated | Education | 2013 |
| Celestine Bloom Ltd | Wholesale & retail | 2025 |
| Celik Family Limited | Hospitality | 2020 |
| Cell Hub Ltd | Wholesale & retail | 2025 |
| CEMENT2.0 Ltd | Construction | 2025 |
| Centaur Properties Limited | Real estate | 2020 |
| Centaur Technologies Limited | Manufacturing | 2010 |
| Centenary Mill Living Ltd | Real estate | 2023 |
| Centeni Limited | Construction | 2012 |
| Centerpiece Events Ltd | Hospitality | 2025 |
| Centodec Limited | Real estate | 2002 |
| Centra Systems Ltd | Information & communication | 2025 |
| Central Imports Limited | Wholesale & retail | 2002 |
| Central Power Services (Topco) Limited | Manufacturing | 2023 |
| Central Radio Ltd | Information & communication | 2021 |
| Centre for Forensic Neuroscience Limited | Administrative & support | 2002 |
| Centre for Research, Training and Policy CIC | Professional & scientific | 2026 |
| Centre Stage Consulting Ltd | Professional & scientific | 2021 |
| Centre Stage Percussion Limited | Wholesale & retail | 2013 |
| Centre Stage Uniforms Limited | Wholesale & retail | 2013 |
| Centreline Group Limited | Professional & scientific | 2016 |