| Chris Sidwells Ltd | Information & communication | 2008 |
| Chrisbia Trans Ltd | Transport & logistics | 2026 |
| Christ Performers Ministries Ltd | Administrative & support | 2023 |
| Christchurch Holland Limited | Extraterritorial | 2022 |
| Christian and Hodges Limited | Construction | 2020 |
| Christian Fellows Colour Limited | Other services | 2025 |
| Christian Transport Ltd | Transport & logistics | 2022 |
| Christine's Antiques Limited | Wholesale & retail | 2025 |
| Christmas Retail UK Ltd | Wholesale & retail | 2022 |
| Christmas Shop Doncaster Limited | Wholesale & retail | 2023 |
| Christopher Alexander Properties Limited | Real estate | 2025 |
| Christopher James Contract Interiors Limited | Manufacturing | 2018 |
| Christopher James Contracts Limited | Manufacturing | 1999 |
| Christopher James Rowland Spark Services Ltd | Construction | 2025 |
| Chrome Marketing Ltd | Other services | 2019 |
| Chrysalets Ltd | Real estate | 2014 |
| Chuanqi Ltd | Hospitality | 2022 |
| Chuc Joinery Limited | Manufacturing | 2024 |
| Chuck Chucks Ltd | Wholesale & retail | 2026 |
| Church Street (Epworth) Freehold Company Limited | Households | 2025 |
| Church Street Bawtry Limited | Construction | 2022 |
| Church View (1-4) Management Limited | Other services | 2006 |
| Churchill Motor Company (Doncaster) Ltd | Wholesale & retail | 2022 |
| Churchill Properties Doncaster Limited | Real estate | 2020 |
| Churchill Storage Limited | Wholesale & retail | 2015 |
| Churchview Dental Practice (Doncaster) Limited | Health & social care | 2014 |
| Churm Financial Management Limited | Professional & scientific | 2025 |
| Ciao Box Grill Ltd | Hospitality | 2023 |
| Ciao CHE Bello Ltd | Wholesale & retail | 2023 |
| Ciao Coffee Limited | Hospitality | 2018 |
| Cinderpath Ltd | Extraterritorial | 2026 |
| Cinderpath Solutions Ltd | Extraterritorial | 2026 |
| Cinderpeak AI Ltd | Extraterritorial | 2026 |
| Cinggl Ltd | Professional & scientific | 2026 |
| Ciopic Transport Ltd | Transport & logistics | 2026 |
| Cip&Day Limited | Transport & logistics | 2020 |
| Ciprian Anchidin Ltd | Transport & logistics | 2022 |
| Circe Health Ltd | Professional & scientific | 2020 |
| Circle of Connection CIC | Administrative & support | 2024 |
| Circled Around Limited | Education | 2019 |
| Circular Ceilings Ltd | Wholesale & retail | 2025 |
| Cirkin Kral Limited | Hospitality | 2025 |
| Cirqle Bar & Cafe Limited | Extraterritorial | 2026 |
| Cirqle Cafe & Bar Limited | Extraterritorial | 2026 |
| Cirqle Cafe Limited | Extraterritorial | 2026 |
| CIS Homes Ltd | Construction | 2019 |
| Citi Accountancy Ltd | Professional & scientific | 2021 |
| Citi Healthcare Ltd | Education | 2022 |
| Citi Recruitment Ltd | Administrative & support | 2022 |
| Citizens Advice Doncaster Borough | Information & communication | 2017 |
| Citlock Glossop Ltd | Administrative & support | 2019 |
| City Care Providers Ltd | Health & social care | 2021 |
| City Point Block Management Ltd | Households | 2024 |
| City Point Hull Ltd | Construction | 2017 |
| City Space UK (Property Lettings) Limited | Real estate | 2020 |
| City Transit Ltd | Transport & logistics | 2026 |
| Citylynx Transport Ltd | Transport & logistics | 2026 |
| Ciucu Express Ltd | Transport & logistics | 2016 |
| Ciuculescu Trans Ltd | Transport & logistics | 2019 |
| CIV Trans Ltd | Transport & logistics | 2024 |
| CJ Audit Services Limited | Professional & scientific | 1999 |
| CJ International Group Ltd | Wholesale & retail | 2018 |
| CJ Storage Ltd | Administrative & support | 2024 |
| CJ25 Ltd | Hospitality | 2023 |
| CJB Construction Services Ltd | Construction | 2025 |
| CJB Haulage (Yorkshire) Limited | Transport & logistics | 2018 |
| CJF Logistics Ltd | Households | 2024 |
| CJH Groundforce Ltd | Administrative & support | 2024 |
| CJN Consulting Limited | Professional & scientific | 2026 |
| CJP Assets Limited | Information & communication | 2025 |
| CJP Consultancy Solutions Ltd | Professional & scientific | 2024 |
| CJS Print Limited | Manufacturing | 2024 |
| CK Bentley Ltd | Hospitality | 2025 |
| CK Excels Ltd | Professional & scientific | 2025 |
| Ck's Fruit and VEG Ltd | Wholesale & retail | 2022 |
| CL Caravan Services and Repairs Limited | Wholesale & retail | 2013 |
| CL Fitness Ltd | Education | 2024 |
| CL Medicall AID U Ltd | Administrative & support | 2016 |
| CL Rentals Ltd | Arts & recreation | 2013 |
| CLADCAD2020 Ltd | Administrative & support | 2020 |
| Claddagh Communications Ltd | Information & communication | 2025 |
| Claire Anthony Homes Limited | Real estate | 2021 |
| Claire Mcentee Ltd | Health & social care | 2014 |
| Claire Mills Consultancy Ltd | Health & social care | 2014 |
| Claire West Interior Design Ltd | Professional & scientific | 2025 |
| Clam and Cork Sea Food Bar Limited | Hospitality | 2019 |
| Clanbond Limited | Real estate | 1976 |
| Clare Topham Clinical Practitions Ltd | Administrative & support | 2017 |
| Claret Accounting Ltd | Professional & scientific | 2020 |
| Clari Health Ltd | Education | 2026 |
| Claribee Consultants Ltd | Professional & scientific | 2025 |
| Clark Electrical Holdings Ltd | Financial services | 2020 |
| Clark Electrical Limited | Construction | 2005 |
| Clark Vehicle Solutions Limited | Wholesale & retail | 2014 |
| Clarke Anthony Limited | Hospitality | 2021 |
| Clarke Events Ltd | Administrative & support | 2017 |
| Clarke Heavey Stonemasonry Ltd | Manufacturing | 2024 |
| Clarke Stonemasonry & Restoration Ltd | Manufacturing | 2017 |
| Clarke-Bailey Systems Limited | Professional & scientific | 2015 |
| Clarking Construction Ltd | Construction | 2020 |