| CG Sales and Marketing Ltd | Professional & scientific | 2025 |
| CH Security Ltd | Administrative & support | 2025 |
| Chadburn Bloctube Marine Ltd | Manufacturing | 2021 |
| Chapman Retail Limited | Wholesale & retail | 2026 |
| Charles Andre UK Limited | Professional & scientific | 1995 |
| Charlotte Hannah Limited | Professional & scientific | 2011 |
| Chasey Bridal Ltd | Wholesale & retail | 2025 |
| Chemdose Limited | Water & waste | 2006 |
| Chemsafe (Yorks) Limited | Wholesale & retail | 2012 |
| Chenar Kutz Ltd | Other services | 2025 |
| Cherry Tree Fold Management Company Ltd | Households | 2018 |
| Chesterton Groundworks Limited | Construction | 2014 |
| Chief Auto Solutions Limited | Wholesale & retail | 2015 |
| Chilton Consultancy Ltd | Professional & scientific | 2026 |
| Chimu Projects Limited | Professional & scientific | 2002 |
| Chiswell Roofing Ltd | Construction | 2017 |
| Choc and Cheese Ltd | Extraterritorial | 2021 |
| Christison and Rowland LLP | | 2006 |
| Christison Mortgages Ltd | Financial services | 2021 |
| Chronicle Publications Limited | Information & communication | 1983 |
| Church Investment Holdings Ltd | Real estate | 2025 |
| Churchside Properties Limited | Real estate | 2017 |
| Cinetico Consulting Limited | Professional & scientific | 2020 |
| Circles Investments Limited | Real estate | 2020 |
| Circular Renewables Ltd | Manufacturing | 2021 |
| CJ Motor Traders Limited | Wholesale & retail | 2011 |
| CJW Homes Limited | Real estate | 2020 |
| Clan Melton Limited | Financial services | 2018 |
| Clark Fleet Services Ltd | Wholesale & retail | 2024 |
| Clarkeswood Limited | Wholesale & retail | 2008 |
| Classic Cleaners Retail Limited | Other services | 2003 |
| Clean Contracts UK Limited | Wholesale & retail | 2023 |
| Cleanpave Ltd | Administrative & support | 2026 |
| Clear Hearing (UK) Ltd. | Wholesale & retail | 2003 |
| Clique Visuals Ltd | Information & communication | 2024 |
| CLK Legal Limited | Professional & scientific | 2023 |
| Close Engineering Services Limited | Manufacturing | 2003 |
| Clover Leaf Home Developments Limited | Construction | 2017 |
| CM Blade Tech Ltd | Manufacturing | 2018 |
| Coates & Coates Ltd | Professional & scientific | 2011 |
| Coffee and Wine by Tommy Ltd | Hospitality | 2019 |
| Cole Management Consulting Limited | Professional & scientific | 2025 |
| Collared Creatures Ltd | Wholesale & retail | 2021 |
| Comech Plumbing Services Ltd | Construction | 2018 |
| Complex Materials Consultants Ltd | Professional & scientific | 2025 |
| Conga Europe Ltd | Information & communication | 2012 |
| Conroy's Conversions Limited | Manufacturing | 2019 |
| Contecx Ltd. | Professional & scientific | 2024 |
| Cooke & Oldfield Building Services Limited | Construction | 2003 |
| Cooper Yard Properties Ltd | Real estate | 2017 |
| Copeland UK Limited | Extraterritorial | 2007 |
| Coral Security Ltd | Manufacturing | 2012 |
| Corelink Ltd | Wholesale & retail | 2025 |
| Corka Ltd | Arts & recreation | 2025 |
| Cormac Leonard (Selby) Ltd | Wholesale & retail | 2021 |
| Corner Studios (London) Limited | Professional & scientific | 2010 |
| Cosgroves Truck Services Ltd | Wholesale & retail | 2017 |
| Cosmic Magpie Ltd | Professional & scientific | 2023 |
| Costrite Limited | Real estate | 1992 |
| Countryside Recycling Limited | Professional & scientific | 2005 |
| County Salad Growers Limited | Wholesale & retail | 1991 |
| Cowick Hall Trustees Limited | Administrative & support | 1997 |
| Cowling Energy Limited | Energy | 2012 |
| Cox-Doyle Properties Ltd | Real estate | 2024 |
| Createdfor Limited | Professional & scientific | 2014 |
| Creative Kitchens Yorkshire Ltd | Professional & scientific | 2024 |
| Crest Brick Slate & Tile Limited | Wholesale & retail | 1998 |
| Crewcutz Limited | Other services | 2020 |
| Cridling Oak Developments Ltd | Construction | 2024 |
| Croda Bakery Services Limited | Professional & scientific | 1954 |
| Croda Chemicals Limited | Professional & scientific | 1948 |
| Croda Colloids Limited | Professional & scientific | 1906 |
| Croda Cosmetics & Toiletries Limited | Professional & scientific | 1891 |
| Croda Distillates Limited | Financial services | 1916 |
| Croda Fire Fighting Chemicals Limited | Professional & scientific | 1976 |
| Croda Hydrocarbons Limited | Professional & scientific | 1926 |
| Croda International Public Limited Company | Professional & scientific | 1925 |
| Croda Investments Limited | Professional & scientific | 2012 |
| Croda Investments NO 2 Limited | Professional & scientific | 2012 |
| Croda Investments NO 3 Limited | Professional & scientific | 2015 |
| Croda JDH Limited | Professional & scientific | 1998 |
| Croda Leek Limited | Professional & scientific | 1946 |
| Croda Limited | Professional & scientific | 1947 |
| Croda Overseas Holdings Limited | Professional & scientific | 1997 |
| Croda Pension Trustees Limited | Professional & scientific | 2010 |
| Croda Resins Limited | Professional & scientific | 1944 |
| Croda Solvents Limited | Professional & scientific | 1988 |
| Croda Trustees Limited | Professional & scientific | 1947 |
| Croda Universal Limited | Professional & scientific | 1911 |
| Croda(Goole)Limited | Professional & scientific | 1959 |
| Crofton Bradfield Wealth Protection Limited | Professional & scientific | 2017 |
| Cromar Building Products Limited | Wholesale & retail | 1996 |
| Crown Garden Centre Limited | Wholesale & retail | 2003 |
| Crwp (Honey POT) Limited | Real estate | 2017 |
| Crwp (Muskham) Limited | Real estate | 2020 |
| Crwp (Spalding) Limited | Real estate | 2016 |
| Crystal Car Wash 2 Ltd | Administrative & support | 2023 |
| CSM Signs & Branding Ltd | Professional & scientific | 2024 |
| CTS Recovery Ltd | Wholesale & retail | 2017 |
| CTW Electrical Contracting Ltd | Manufacturing | 2021 |