| Carte Blanche Media Ltd | Information & communication | 2018 |
| Carter & Brown (Yorkshire) Ltd | Wholesale & retail | 2012 |
| Carter Bidco Ltd | Financial services | 2025 |
| Carter Cowley Partnership Ltd | Wholesale & retail | 2018 |
| Carter Debtco II Ltd | Financial services | 2025 |
| Carter Debtco Ltd | Financial services | 2025 |
| Carter DEE Limited | Professional & scientific | 2025 |
| Carter Enterprises Holdings Ltd | Hospitality | 2026 |
| Carter Fernandez Associates Limited | Professional & scientific | 2016 |
| Carter Financial Solutions Ltd | Financial services | 2023 |
| Carter Reynolds Holdings Ltd | Financial services | 2024 |
| Carter Towler Holdings Limited | Financial services | 2020 |
| Carter Towler Limited | Professional & scientific | 2013 |
| Carter Wealth Management Ltd | Financial services | 2012 |
| Carters BTL Limited | Real estate | 2019 |
| Carters CCS Limited | Hospitality | 2025 |
| Carters Land Limited | Construction | 2021 |
| Carters Plumbing and GAS Ltd | Construction | 2018 |
| Carthy Building Ltd | Construction | 2017 |
| Carthy Contracting Limited | Construction | 2019 |
| Carthy Garden Maintenance Ltd | Administrative & support | 2017 |
| Carthy Properties Ltd | Real estate | 2025 |
| Cartluxe Limited | Administrative & support | 2025 |
| Cartonage Holdings Limited | Financial services | 2026 |
| Cartonage Limited | Manufacturing | 2006 |
| Cartride Limited | Construction | 1978 |
| Cartridge Monster Ltd | Wholesale & retail | 2013 |
| Cartwright Care Balmoral Management Ltd | Health & social care | 2019 |
| Cartwright Care Balmoral Property Ltd | Real estate | 2019 |
| Cartwright Care Holdings Ltd | Professional & scientific | 2019 |
| Cartwright Flooring Limited | Construction | 2026 |
| Carvill Property Ltd | Households | 2021 |
| Carwale UK Ltd | Wholesale & retail | 2025 |
| Carweb Limited | Professional & scientific | 2007 |
| Carwest Ltd | Wholesale & retail | 2024 |
| Carwood Solutions Limited | Information & communication | 2019 |
| Carwurx Garage Services Limited | Wholesale & retail | 2013 |
| Casa Colombiana Limited | Wholesale & retail | 2007 |
| Casa DI Luxe Ltd | Manufacturing | 2026 |
| Casa Gialla Property Management Ltd | Real estate | 2025 |
| Casa Gyros Ltd | Hospitality | 2023 |
| Casa HPR Ltd | Real estate | 2024 |
| Casa Italia Leeds Ltd | Hospitality | 2022 |
| Casa Latina Foods Ltd | Information & communication | 2024 |
| Casa Morgan Ltd | Construction | 2026 |
| Casa Property Partners Holdings Ltd | Real estate | 2024 |
| Casa Property Partners Investments Ltd | Real estate | 2025 |
| Casa Property Partners Ltd | Real estate | 2023 |
| Casa Skin Clinic Ltd | Other services | 2025 |
| Casa Tattoo Ltd | Other services | 2025 |
| Casablanca Development Phase One Limited | Construction | 2024 |
| Casablanca Lounge Leeds Limited | Hospitality | 2024 |
| Casablanca Menston Limited | Construction | 2025 |
| Casamigos Properties Ltd | Real estate | 2025 |
| Casanz Ltd | Information & communication | 2016 |
| Casayeadon Limited | Hospitality | 2017 |
| Cascade Barracks Ltd | Real estate | 2020 |
| Cascade Healthcare Ltd | Health & social care | 2024 |
| Cascade Heights Limited | Other services | 2017 |
| Cascade Homes Group ( Y & H ) Limited | Real estate | 2013 |
| Cascade Homes Group Limited | Real estate | 2007 |
| Cascade Homes Ltd | Real estate | 2001 |
| Cascade Homes Yorkshire Limited | Real estate | 2018 |
| Cascade North East Limited | Other services | 2019 |
| Case LMS Limited | Information & communication | 2026 |
| Case Productions CIC | Arts & recreation | 2025 |
| Case to Answer Limited | Other services | 2018 |
| Casemax Limited | Health & social care | 2013 |
| Casestream Limited | Professional & scientific | 2010 |
| Casey Designs Ltd | Professional & scientific | 2017 |
| Cash 4 YOU Leeds Ltd | Wholesale & retail | 2025 |
| Cash Creators Cleethorpes Ltd. | Wholesale & retail | 2010 |
| Cash Direct (UK) Limited | Financial services | 2003 |
| Cash Direct 361 Ltd | Wholesale & retail | 2022 |
| Cash Express Leeds Ltd | Other services | 2010 |
| Cash in Ltd. | Wholesale & retail | 2013 |
| Cash Market Limited | Wholesale & retail | 2024 |
| Cash Store Ltd | Wholesale & retail | 2019 |
| CASH4CARS Leeds Limited | Extraterritorial | 2014 |
| Cashmoon Limited | Wholesale & retail | 2023 |
| Cashplanet Ltd | Wholesale & retail | 2017 |
| Cask Leeds Limited | Health & social care | 2014 |
| Casper Beds Ltd | Wholesale & retail | 2024 |
| Casper Trading Co Ltd | Wholesale & retail | 2015 |
| Caspian Auto Ltd | Wholesale & retail | 2025 |
| Caspian Metals Ltd | Manufacturing | 2025 |
| Cass Booth Limited | Education | 2025 |
| Cassiel Group Ltd | Real estate | 2025 |
| Cassini Properties Estate and Lettings Limited | Administrative & support | 2017 |
| Cassiopeia 1958 Holdings Limited | Financial services | 2022 |
| Cassius (ST) Limited | Professional & scientific | 2025 |
| Cassius Cliffe Bar Ltd | Hospitality | 2026 |
| Cassius Couture Clothing Ltd | Wholesale & retail | 2021 |
| Cassius Healthcare Limited | Administrative & support | 2019 |
| Cast Heat Ltd. | Manufacturing | 1985 |
| Cast Media Group Limited | Manufacturing | 1994 |
| Cast Productions Limited | Wholesale & retail | 2021 |
| Castelet Properties Ltd | Real estate | 2024 |
| Castings Solutions Ltd | Professional & scientific | 2026 |
| Castle Bites Limited | Other services | 2019 |