| CHC Consult Ltd | Administrative & support | 2020 |
| Cheek 2 Chic Aesthetics Ltd | Health & social care | 2021 |
| Cheesecakeaway Ltd | Hospitality | 2021 |
| Chef Jomon's #Veedu Limited | Hospitality | 2025 |
| Chef Lopez Ltd | Hospitality | 2020 |
| Chelmsford Elite Fitness Ltd | Professional & scientific | 2013 |
| Chelmsford Scaffolding Services Limited | Construction | 2023 |
| Chelsea Amelie Design Ltd | Professional & scientific | 2022 |
| Chelsea Rail Ltd | Other services | 2016 |
| Chelsea Refurbishment Ltd | Construction | 2018 |
| Chemolinx Healthcare Services Ltd | Health & social care | 2023 |
| Chen Charis Ltd | Real estate | 2021 |
| Cheques and Balances Ltd | Professional & scientific | 2026 |
| Cherished Childcare UK Limited | Health & social care | 2017 |
| Cherished Childminding Service Limited | Health & social care | 2014 |
| Cherry Medlars Properties Limited | Real estate | 2024 |
| Cherry Tree Agricultural Maintenance Limited | Administrative & support | 2024 |
| Cheshire 2020-1 PLC | Financial services | 2020 |
| Cheshunt Group Limited | Administrative & support | 1998 |
| Chester Hall Lane Limited | Administrative & support | 2024 |
| Cheswick Residents Association Limited | Households | 1986 |
| Chibraj Polo Ltd | Wholesale & retail | 2025 |
| Chibueze & Co Limited | Other services | 2017 |
| Chidimma & Co Limited | Health & social care | 2025 |
| Chieys Health Care Ltd | Health & social care | 2023 |
| Chignal Brickworks Ltd | Construction | 2009 |
| Chigo Cargo Ltd | Transport & logistics | 2022 |
| Chikkuchinnu Healthcare Limited | Health & social care | 2014 |
| Chikuruwo Original Investments Limited | Agriculture & fishing | 2025 |
| Chilling Chow Limited | Information & communication | 2025 |
| Chiltern Plumbing and Mechanical Limited | Construction | 2023 |
| Chinny O Limited | Construction | 2014 |
| Chip MOB Ltd | Hospitality | 2026 |
| Chitre Limited | Health & social care | 2011 |
| Chivers Shine Ltd | Wholesale & retail | 2025 |
| Chloe Tickle Consulting Limited | Administrative & support | 2022 |
| Choice Ruby Ltd | Hospitality | 2016 |
| Choices Family Support Service Limited | Health & social care | 2011 |
| CHR Project Ltd | Construction | 2023 |
| Chris Millington Limited | Construction | 2016 |
| Chrisellie Community Care Ltd | Health & social care | 2021 |
| Chrislor Ltd | Professional & scientific | 2015 |
| Christ Glory Word Ministries | Other services | 2013 |
| Christ Universal Bible College | Education | 2003 |
| Christiana Care Services Limited | Health & social care | 2013 |
| Christine MAY Interior Design Ltd | Professional & scientific | 2018 |
| Christland Enterprises Limited | Information & communication | 2010 |
| Chronos Enterprise Limited | Information & communication | 2024 |
| Chugg-On Limited | Agriculture & fishing | 2012 |
| Chunkychips.Net Limited | Information & communication | 2003 |
| Church Street (Dereham) Management Company Limited | Administrative & support | 2015 |
| Churchill NO.3 Limited | Financial services | 2021 |
| Ciam Surveying Limited | Professional & scientific | 2025 |
| Ciboney Limited | Arts & recreation | 2017 |
| Cinecarp TV Ltd | Agriculture & fishing | 2023 |
| Cinegogh Limited | Arts & recreation | 2017 |
| Cinema Management Ltd | Information & communication | 2026 |
| Cinematic Evenings Ltd | Hospitality | 2025 |
| Cinq Partnership Ltd | Administrative & support | 2020 |
| Circle Solutions Ltd | Information & communication | 2008 |
| Circuit Solutions (London) Limited | Construction | 2025 |
| Cism (UK) Limited | Arts & recreation | 2012 |
| Citizens Advice Braintree & South Essex Limited | Information & communication | 2005 |
| Citrus Bloom Designs Ltd | Arts & recreation | 2026 |
| City Box Ltd | Transport & logistics | 2015 |
| City Lockers Limited | Manufacturing | 2013 |
| City Providence Property Holdings Limited | Real estate | 2020 |
| City Safety Management Limited | Professional & scientific | 2021 |
| City Shelter Limited | Real estate | 2023 |
| City Wills (Nationwide) Limited | Financial services | 2026 |
| City Works Solutions Ltd | Construction | 2017 |
| Cityhands Limited | Administrative & support | 2025 |
| Citymain Corporate Ltd | Real estate | 2014 |
| Citynet Datacom Limited | Information & communication | 2002 |
| Ciubotaru Build Ltd | Construction | 2016 |
| CJ Floors Ltd | Construction | 2023 |
| Cj's Tindahang Pinoy Limited | Wholesale & retail | 2024 |
| CJA Retail Maintenance Ltd. | Construction | 2016 |
| CJM Construction (UK) Limited | Construction | 2011 |
| CJR Fire and Security Ltd | Construction | 2025 |
| CJS Contracts Limited | Construction | 2018 |
| CJS Heating & Air Conditioning Services Limited | Energy | 2013 |
| CK Engineering Design Limited | Professional & scientific | 2026 |
| Ckhc Services Limited | Construction | 2026 |
| Cladlec Ltd | Construction | 2021 |
| Claire Does Hair Limited | Other services | 2011 |
| Clamp N Seize Ltd | Financial services | 2022 |
| Clannets Data Analytics Limited | Information & communication | 2024 |
| Clara Ratio Ltd | Information & communication | 2026 |
| Claritusco Ltd | Professional & scientific | 2025 |
| Clarity Properties Limited | Construction | 2002 |
| Clark M Consultancy Ltd | Construction | 2022 |
| Clark Mechanical Installations Limited | Professional & scientific | 2015 |
| Clarke's Windows Doors & Conservatories Ltd | Construction | 2010 |
| Clarkes Accountancy Ltd | Professional & scientific | 2017 |
| Clarkes Restaurant Limited | Professional & scientific | 1996 |
| Clarmond Wealth Limited | Financial services | 2013 |
| Class a Limited | Professional & scientific | 1989 |
| Classic Roofing Contracts Limited | Construction | 2003 |
| Classic Trim (Essex) Ltd | Wholesale & retail | 2018 |