| Catalyst Clinical Psychology Limited | Health & social care | 2018 |
| Catalyst Protection Systems (UK) Limited | Administrative & support | 2026 |
| Catalyst QA Ltd | Education | 2010 |
| Catam Properties Limited | Real estate | 2017 |
| Catch (Yorkshire) Ltd | Hospitality | 2019 |
| Catena Properties Ltd | Construction | 2017 |
| Catering Cleaning Services Limited | Administrative & support | 1988 |
| Catering Parts (UK) Limited | Extraterritorial | 2006 |
| Cathedral Coatings Limited | Construction | 2026 |
| Cathedral Housing Limited | Real estate | 2026 |
| Catherine Knibbs Limited | Health & social care | 2023 |
| Cats Pyjamas Productions Ltd | Arts & recreation | 2011 |
| Catteralls Solicitors Limited | Professional & scientific | 2022 |
| Cavaghan & Gray Group Limited | Manufacturing | 1978 |
| Cavaghan & Gray Limited | Agriculture & fishing | 1919 |
| CAW Maintenance Group Limited | Construction | 2023 |
| Cawdorbythesea Ltd. | Hospitality | 2022 |
| Cayman Advisory Services Limited | Professional & scientific | 2007 |
| CB Deliver Ltd | Transport & logistics | 2023 |
| CB Professional Ltd | Administrative & support | 2026 |
| CB PUB Management Ltd | Hospitality | 2022 |
| CBJ Property Investments Limited | Real estate | 1993 |
| CBR Associates Limited | Information & communication | 2004 |
| CC Glass Limited | Manufacturing | 2024 |
| CC Services Yorkshire Limited | Construction | 2017 |
| CC Special Events Limited | Hospitality | 2012 |
| CC Travel Services Ltd | Administrative & support | 2015 |
| CC Workflow Specialists Limited | Information & communication | 2022 |
| CCE (Energy) Ltd | Construction | 2018 |
| CCH Insurance Brokers Limited | Financial services | 2016 |
| CCL Facades Limited | Construction | 2022 |
| CCS Cool - Clima - Service Limited | Construction | 2006 |
| Cdass Consulting Limited | Health & social care | 2020 |
| CDC Composite Door Company Limited | Construction | 2016 |
| CDH Autos Ltd | Wholesale & retail | 2023 |
| CDK Services Ltd | Professional & scientific | 2021 |
| CDL Electrical Contractors Limited | Construction | 2023 |
| CE Parts Ltd | Wholesale & retail | 2023 |
| Ceata Ltd | Health & social care | 2025 |
| Cectla Limited | Wholesale & retail | 2025 |
| Cedar Rose Fashion Ltd | Manufacturing | 2024 |
| Cedarwood Business Park Limited | Real estate | 2018 |
| Cedat International Ltd. | Information & communication | 2025 |
| CEG Automotive Ltd | Transport & logistics | 2022 |
| CEL Trio Investments Ltd | Real estate | 2025 |
| Celina Joyce Limited | Professional & scientific | 2024 |
| Cenit Solutions Ltd | Professional & scientific | 2017 |
| Central Avenue Function Band Ltd | Arts & recreation | 2018 |
| Central Fieldwork Ltd | Professional & scientific | 2017 |
| Centurio Limited | Administrative & support | 2004 |
| Century Property (Leeds) Limited | Real estate | 2023 |
| Century Riverside Limited | Construction | 2007 |
| Century Way (Number Seven) Limited | Professional & scientific | 1947 |
| Century Way (Wiltshire) Limited | Professional & scientific | 1891 |
| Century Way Dale Limited | Professional & scientific | 1995 |
| Cerebris Consulting Limited | Administrative & support | 2011 |
| Certax Accounting (Barnsley) Limited | Professional & scientific | 2011 |
| Cerum Liahona Ltd | Real estate | 2023 |
| Cesi PR Limited | Professional & scientific | 2025 |
| CF Bidco Limited | Professional & scientific | 2010 |
| CFB Foodservice Limited | Hospitality | 2023 |
| Cfx-Systems Ltd. | Professional & scientific | 2023 |
| CG Building Contractors Ltd | Construction | 2016 |
| CG Medical Ltd | Health & social care | 2022 |
| CG Secretarial Limited | Extraterritorial | 2006 |
| CGL Maintenance Ltd | Construction | 2016 |
| Chadwick Capricorn Limited | Professional & scientific | 2003 |
| Chadwick Property Group Ltd | Households | 2026 |
| Chaincertain Limited | Transport & logistics | 1988 |
| Champion World Holdings Limited Partnership | | 2008 |
| Changing Futures Together C.I.C. | Education | 2024 |
| Chantry Contractors Limited | Construction | 1980 |
| Chaotic Good Company Ltd | Wholesale & retail | 2023 |
| Chappelow Sports Turf Holdings Limited | Financial services | 2026 |
| Chappelow Sports Turf Limited | Arts & recreation | 2006 |
| Chapter by Chapter Keepsakes Ltd | Professional & scientific | 2026 |
| Charisma Ltd | Manufacturing | 2005 |
| Charlesworth Motors Limited | Wholesale & retail | 2015 |
| Charlotte Goodwin Developments Limited | Construction | 2018 |
| Charlotte Jayne Ltd | Wholesale & retail | 2020 |
| Charlton Court Care Home Limited | Health & social care | 2011 |
| Charltons Curtains and Blinds Limited | Wholesale & retail | 2017 |
| Charterlease Limited | Real estate | 2008 |
| Chatsworth International Limited | Real estate | 2024 |
| Chatsworth LP | | 2009 |
| Chattelgrove Limited | Real estate | 1993 |
| Chaudhary Wakefield Ltd | Extraterritorial | 2018 |
| Chb-Jordan Limited | Manufacturing | 1990 |
| Check That Price Ltd | Information & communication | 2024 |
| Cheeky Monkeys (Wakefield) Limited | Health & social care | 2018 |
| Cheetah Hills Ltd | Extraterritorial | 2022 |
| Chelh Ltd | Information & communication | 2025 |
| Chemtech T-C-S Ltd | Wholesale & retail | 2011 |
| Chen Property Management Ltd | Real estate | 2019 |
| Cherie HD Ltd | Other services | 2022 |
| Cheryl Holliday Limited | Other services | 2011 |
| Cherylann Limited | Other services | 2008 |
| Chester Hydraulics Limited | Extraterritorial | 2004 |
| Chevet Associates Ltd | Professional & scientific | 2007 |
| Chevet Construction Limited | Construction | 2017 |