| C&A Capital Ltd | Real estate | 2026 |
| C&A Payne Properties Limited | Real estate | 2020 |
| C&S Libertas Limited | Real estate | 2020 |
| C&T UK Services Ltd | Wholesale & retail | 2024 |
| C-Flow Energy Limited | Other services | 2008 |
| C.& E.Piggeries Limited | Wholesale & retail | 1961 |
| C.& J.Haileys Limited | | 1937 |
| C.C.A Services International Limited | Construction | 2017 |
| Cable & Co Plumbing and Heating Limited | Construction | 2025 |
| Cadynamics Ltd | Professional & scientific | 2024 |
| Cafe 432 Ltd | Health & social care | 2025 |
| Cafe Angel (Holdings) Limited | Professional & scientific | 2011 |
| Cafe Angel Limited | Hospitality | 2003 |
| Caleb Spence Financial Services Limited | Financial services | 2010 |
| Callum Harvey Residential Surveying Services Limited | Professional & scientific | 2025 |
| Calouco Ltd | Manufacturing | 2025 |
| Camco Properties Limited | Real estate | 2016 |
| Camcon Security Ltd | Administrative & support | 2024 |
| Candi Gifts Limited | Extraterritorial | 2009 |
| Candler’S Mews Management Ltd | Households | 2022 |
| Cannock 247 Limited | Arts & recreation | 2020 |
| Cannon Holidays Limited | Real estate | 2012 |
| Capps-Jenner Services Limited | Mining & quarrying | 2016 |
| Car and Boat Trimmers Limited | Wholesale & retail | 1980 |
| Care Home Jobs 4 U Limited | Health & social care | 2006 |
| Caring Moments Limited | Administrative & support | 2012 |
| Carivol Limited | Other services | 2018 |
| Carl Wright Training Services Limited | Professional & scientific | 2012 |
| Carlton Cleaning (E.A) Limited | Administrative & support | 2006 |
| Carlton Colville Service Station Limited | Wholesale & retail | 2019 |
| Carlton Paper Sticks Limited | Wholesale & retail | 2014 |
| Carlton Upvc Home Improvements Limited | Construction | 2013 |
| Carlyssocials Ltd | Public administration | 2026 |
| Carol Brown Consulting Limited | Professional & scientific | 2007 |
| Carson's Cleaning Services Limited | Administrative & support | 2002 |
| Case Global Ltd | Professional & scientific | 2024 |
| Cashman Financial Planning Limited | Professional & scientific | 2011 |
| Castle Well Developments Ltd | Construction | 2014 |
| Castleton & Co Properties Ltd | Real estate | 2025 |
| Castlewick Limited | Wholesale & retail | 2024 |
| Catalyst Counselling CIC | Health & social care | 2014 |
| Catchym Limited | Professional & scientific | 2021 |
| Catherine COE Ltd | Arts & recreation | 2015 |
| Cattermole Global Holdings Limited | Real estate | 2020 |
| Cattermole Global Limited | Professional & scientific | 2020 |
| Caveden Limited | Wholesale & retail | 2024 |
| CB Elec Ltd | Construction | 2019 |
| CBS Scaffolding Solutions Ltd | Construction | 2024 |
| CDS - KAS Limited | Information & communication | 2010 |
| CDS Fabrications Limited | Construction | 2025 |
| Cdty Engineering Limited | Professional & scientific | 2020 |
| Cefas Technology Limited | Manufacturing | 2001 |
| Center Point Commercial Services Ltd. | Professional & scientific | 2017 |
| Central City Company Limited(The) | Financial services | 1983 |
| Centred Education Group Ltd | Education | 2025 |
| Century Training Academy Limited | Education | 2013 |
| Cfog Engineering and Construction Ltd | Professional & scientific | 2025 |
| Challis Developments Limited | Real estate | 2016 |
| Chalstoanes Limited | Real estate | 2021 |
| Chameleon Consultancy & Training Limited | Professional & scientific | 2021 |
| Chapel Road Cafe Ltd | Hospitality | 2025 |
| Chapenny Ltd | Wholesale & retail | 2022 |
| Charlene Wright Beauty Limited | Other services | 2019 |
| Charleston Property Development Ltd | Real estate | 2024 |
| Charlotte Mellish Photography Limited | Professional & scientific | 2025 |
| Charnwood Property Management Limited | Real estate | 2004 |
| Chater Properties Development Limited | Construction | 2023 |
| Chater Properties Limited | Real estate | 2021 |
| Chenery Contractors Limited | Construction | 2001 |
| Cheung Therapy Limited | Health & social care | 2026 |
| Chick Kebab Ltd | Hospitality | 2025 |
| Chilton Associates Limited | Professional & scientific | 2022 |
| Chin Chiu Limited | Hospitality | 2025 |
| China Health UK Limited | Other services | 2014 |
| China Star NR33 Ltd | Hospitality | 2026 |
| Chislehurst Limited | Wholesale & retail | 2003 |
| Chorus Boys Ltd | Arts & recreation | 2025 |
| Chorus Girls Ltd | Arts & recreation | 2025 |
| Chorus Productions Limited | Arts & recreation | 2022 |
| Chpv Group Ltd | Financial services | 2025 |
| Chpv Ltd | Information & communication | 2025 |
| Chris Eastaugh Builder Limited | Construction | 2002 |
| Church Road Retreats Ltd | Real estate | 2024 |
| Citizens Advice East Suffolk Ltd | Other services | 2006 |
| City Fish (Norwich) Limited | Wholesale & retail | 2006 |
| City to Coast Day Tours Ltd | Transport & logistics | 2018 |
| CJ & JB Services Ltd | Mining & quarrying | 2026 |
| CJD Enterprises Ltd | Other services | 2025 |
| CJM Renewables Ltd | Construction | 2023 |
| CJR Prime Estates Ltd | Real estate | 2025 |
| CJR TM Ltd | Construction | 2021 |
| CJS Builders East Anglia Ltd | Construction | 2025 |
| CJW Building & Plumbing Services Ltd | Construction | 2010 |
| Claremont Cafe Ltd | Hospitality | 2024 |
| Clark's Offshore Ltd | Mining & quarrying | 2016 |
| Clarke's Driveways/Surfacing and Groundworks Limited | Construction | 2025 |
| Classic Coaches (Lowestoft) Limited | Professional & scientific | 1946 |
| Claw Engineering Ltd | Mining & quarrying | 2024 |
| Claxton Creative Limited | Professional & scientific | 2025 |
| Clayphan Welding & Fabrication Limited | Manufacturing | 2024 |