| Cinnamon Daisy Ltd | Extraterritorial | 2023 |
| Circle HD Ltd | Wholesale & retail | 2008 |
| Circle Home Improvements Ltd | Construction | 2023 |
| Cire Societe Ltd | Wholesale & retail | 2026 |
| Cirkits Limited | Education | 2021 |
| Cirrus Building Technologies Ltd | Information & communication | 2024 |
| City Leisure Limited | Hospitality | 2024 |
| City Park Solutions Limited | Transport & logistics | 2024 |
| City Partnership Trustee Limited | Administrative & support | 2014 |
| City Studios Ltd | Real estate | 2021 |
| Cityforge Properties Limited | Construction | 2025 |
| CJ Bartonwood Ltd | Professional & scientific | 2014 |
| CJC Property Group Ltd | Real estate | 2025 |
| CJC Property Sourcing Ltd | Real estate | 2025 |
| CJC Tax Ltd | Professional & scientific | 2021 |
| Cjdyson Property Ltd | Real estate | 2026 |
| CJW Design Limited | Professional & scientific | 2018 |
| CK Huddersfield Ltd | Hospitality | 2023 |
| CK Survey Services Ltd | Professional & scientific | 2015 |
| CKP Holmfirth Ltd | Wholesale & retail | 2010 |
| CKR Traders Limited | Wholesale & retail | 2024 |
| CL Maintenance Limited | Construction | 2022 |
| CL Properties Yorkshire Limited | Real estate | 2021 |
| CL Virtual Assist Services Limited | Administrative & support | 2021 |
| Cladd Homes Ltd | Real estate | 2025 |
| Cladd Jointing Ltd | Administrative & support | 2024 |
| Claire Wood Photography Limited | Arts & recreation | 2006 |
| Claires Hair and Beauty Ltd | Other services | 2022 |
| Clarant Hair Ltd | Other services | 2019 |
| Claremont Finance Ltd | Financial services | 2022 |
| Claret & Stone Limited | Real estate | 2024 |
| Clarick Family Investment Company Ltd | Real estate | 2016 |
| Claridge & Pearson Limited | Real estate | 2021 |
| Claritus Properties Limited | Real estate | 2020 |
| Claritus Properties Management Limited | Real estate | 2020 |
| Clarity Consulting (Yorkshire) Ltd | Professional & scientific | 2010 |
| Clarity Window Cleaning Services Ltd | Administrative & support | 2020 |
| Clarke Commercial Property Limited | Real estate | 2008 |
| Clarke Fiddes and Company Limited | Construction | 1975 |
| Clarke Meats Limited | Manufacturing | 1999 |
| Clarke Plumbing and Heating Solutions Ltd | Construction | 2023 |
| Clarkson Homes Limited | Real estate | 2018 |
| Clarus (Hudd) Limited | Wholesale & retail | 2018 |
| Class Projects & Maintenance Limited | Administrative & support | 2023 |
| Classic Concrete & Masterpave Ltd | Construction | 2012 |
| Classified Property Maintenance Limited | Construction | 2021 |
| Clauds Angel Limited | Other services | 2021 |
| CLAUSE9 Solutions Limited | Professional & scientific | 2020 |
| Clay Construction (Huddersfield) Ltd | Construction | 1997 |
| Clay Well Consultancy Ltd | Administrative & support | 2022 |
| Claydxa Limited Partnership | | 2024 |
| Clayson & Sons Limited | Wholesale & retail | 2024 |
| Clayton Court Apartments Manco Ltd | Households | 2020 |
| Clayton Creative Limited | Professional & scientific | 2002 |
| Clayton Hall Farm Bioenergy LLP | | 2009 |
| Clayton Property Investment Limited | Real estate | 2016 |
| Clayton Village Stores Ltd | Wholesale & retail | 2025 |
| Clean Shine Hand Car Wash Ltd | Administrative & support | 2025 |
| Clean Sweep 4 YOU Ltd | Administrative & support | 2024 |
| Cleaner Clean Limited | Administrative & support | 2016 |
| Cleaning and Removal Services Limited | Administrative & support | 2019 |
| Cleanyourcar Limited | Wholesale & retail | 2011 |
| Clear Ears Yorkshire Ltd | Health & social care | 2024 |
| Clear Interventions Ltd | Professional & scientific | 2021 |
| Clear Light Advisory Limited | Transport & logistics | 2015 |
| Clear View Bifolding Doors Limited | Administrative & support | 2009 |
| Clear View L.A Cleaning Ltd | Administrative & support | 2025 |
| Clearesult Ltd | Administrative & support | 2017 |
| Clearooms Limited | Information & communication | 2020 |
| Clearsight Solutions Ltd | Health & social care | 2023 |
| Cleartask Limited | Wholesale & retail | 1995 |
| Cleartech Accounting Limited | Professional & scientific | 2024 |
| Clearview Optics Limited | Wholesale & retail | 2008 |
| Clearview Tracking Ltd | Information & communication | 2025 |
| Clearwater (Capernwray) Management Company Limited | Extraterritorial | 2009 |
| Cleens Sneakers Ltd | Manufacturing | 2021 |
| Clemence Hair Beauty Limited | Other services | 2022 |
| Clement Group Ltd | Wholesale & retail | 2022 |
| Cleo Aesthetic Limited | Health & social care | 2018 |
| Cleo Developments Limited | Real estate | 2024 |
| Clerks of Works Inspector Services Ltd | Other services | 2014 |
| Cleveland Holdings Limited | Health & social care | 2016 |
| Cleverbee Services Ltd | Education | 2022 |
| Click IP Ltd | Information & communication | 2019 |
| Click the Goods Ltd | Wholesale & retail | 2024 |
| Clickandbuying Limited | Wholesale & retail | 2023 |
| Clickandshop Limited | Wholesale & retail | 2025 |
| Cliffe END Yarns Limited | Manufacturing | 2017 |
| Cliffe House (Organics) Limited | Manufacturing | 2014 |
| Cliffside Assist Ltd | Administrative & support | 2025 |
| Clinaxis Ltd | Health & social care | 2026 |
| Clinic S Podiatry & Chiropody Ltd | Health & social care | 2026 |
| Clinical Consultancy Ltd | Professional & scientific | 2016 |
| Clinical Support Solutions Limited | Health & social care | 2020 |
| Clint Caribbean Cuisine Ltd | Hospitality | 2022 |
| Clive Hudson Associates Ltd | Professional & scientific | 2004 |
| Clive Hudson Limited | Professional & scientific | 2019 |
| Clix Studios Ltd | Information & communication | 2018 |
| Clobber Swap Limited | Wholesale & retail | 2020 |
| Clocktower Commercial Ltd | Professional & scientific | 2024 |