| Cera Care Central Limited | Information & communication | 2022 |
| Cera Care Operations Limited | Health & social care | 2001 |
| Cera Care Services Ltd | Information & communication | 2023 |
| Cera Care Technology Limited | Information & communication | 2021 |
| Cera Homecare Limited | Administrative & support | 2017 |
| Ceres 2 Limited | Extraterritorial | 2015 |
| Cerise Aesthetics & Beauty Ltd | Other services | 2021 |
| Certified Marketing Ltd | Administrative & support | 2025 |
| Certsync Limited | Construction | 2026 |
| CES Special Site Projects Limited | Professional & scientific | 2017 |
| CEY (Property Developments) Limited | Construction | 2018 |
| CEY Properties Limited | Real estate | 2017 |
| CF Entertainment East Anglia Ltd | Hospitality | 2022 |
| CFB Electrical Ltd | Construction | 2012 |
| CFC Peri Peri Limited | Hospitality | 2026 |
| Cfengineers Ltd | Construction | 2020 |
| CG Influence Ltd | Professional & scientific | 2021 |
| CGC Advisory Ltd | Financial services | 2025 |
| CGH Telecom Ltd | Information & communication | 2026 |
| CGM Property Rental Ltd | Real estate | 2022 |
| CGM Trading Limited | Wholesale & retail | 2007 |
| CGP Long Financial Planning Ltd | Financial services | 2022 |
| CGU Services Limited | Health & social care | 2019 |
| CGU Support Services Ltd | Administrative & support | 2026 |
| CH (Benson) Limited | Health & social care | 2020 |
| CH (Elevation) Holdings Limited | Financial services | 2018 |
| CH (Elevation) Limited | Financial services | 2018 |
| CH Octopus (Holdings) Limited | Financial services | 2020 |
| CH Renovations and Repairs Ltd | Information & communication | 2024 |
| CH Surgical Services Ltd | Health & social care | 2019 |
| Chafford Gorges Limited | Arts & recreation | 2004 |
| Chaffy Limited | Other services | 2007 |
| Chain House School Street Management Company Limited | Real estate | 2007 |
| Chainevent Limited | Administrative & support | 2000 |
| Chalker Holdings Limited | Administrative & support | 2026 |
| Chalkney Meadows (Lowefields) Management Company Limited | Households | 2021 |
| Chalkney View Management Company Limited | Real estate | 2017 |
| Challenge First AID Ltd | Health & social care | 2023 |
| Challenge Running Ltd | Administrative & support | 2012 |
| Chamberlain Homes Ltd | Construction | 2019 |
| Chamberlain Senter Property Limited | Real estate | 2025 |
| Chambers Properties & Renovations Ltd | Construction | 2020 |
| Chameleon Codewing Holdings Ltd | Financial services | 2015 |
| Chameleon Codewing Limited | Other services | 1990 |
| Chameleon Codewing Trustee Limited | Extraterritorial | 2025 |
| Chameleon Dynamics Ltd | Information & communication | 2012 |
| Champain Financial Services Limited | Financial services | 2009 |
| Champery Investments Limited | Administrative & support | 2006 |
| Champion Plumbing and Heating Ltd | Construction | 2010 |
| CHANCE2WORK C.I.C. | Health & social care | 2024 |
| Chancery Farm Limited | Agriculture & fishing | 1964 |
| Chancery West Law Limited | Professional & scientific | 2014 |
| Chances Galore Ltd | Health & social care | 2014 |
| Chandlers Ford (Chelmsford) Management Company Limited | Households | 1984 |
| Chandlers ROW (Management) Limited | Real estate | 2007 |
| Chandos Music Limited | Arts & recreation | 1965 |
| Chandos Records Limited | Arts & recreation | 1979 |
| Chandra SAI Nivas Limited | Real estate | 2023 |
| Chandradil Property Limited | Real estate | 2025 |
| Change Connect Ltd | Wholesale & retail | 2019 |
| Changexphere Limited | Information & communication | 2021 |
| Changing Lives Community Services CIC | Education | 2020 |
| Changing Lives Limited | Administrative & support | 2015 |
| Chantbury Limited | Transport & logistics | 1992 |
| Chantry Drive (Wormingford) Management Company Limited | Households | 2000 |
| Chapel Business Solutions Limited | Professional & scientific | 2014 |
| Chapel Developments (East Anglia) Ltd | Construction | 2003 |
| Chapel Estate Management Ltd | Professional & scientific | 2022 |
| Chapel House (Witham) Management Company Limited | Households | 2015 |
| Chapel New Homes Ltd | Construction | 2004 |
| Chapel Street (Billericay) Management Company Limited | Households | 2001 |
| Chapelwood Joinery Limited | Manufacturing | 2008 |
| Chaplane Accident Repair Centre Ltd | Wholesale & retail | 2007 |
| Chapleo Consultancy Ltd | Professional & scientific | 2022 |
| Chappel Millennium Green Limited | Arts & recreation | 2011 |
| Chappells Limited | Administrative & support | 2020 |
| Chappo Music Limited | Arts & recreation | 1978 |
| Character Campers Ltd | Manufacturing | 2020 |
| Charbon Property Development Limited | Construction | 2025 |
| Charles Porter & Company Limited | Financial services | 2019 |
| Charleston Court (West Mersea) RTM Company Limited | Households | 2013 |
| Charlie & the Content Factory Ltd | Professional & scientific | 2019 |
| Charlie's GAS & Heating Services Ltd | Construction | 2007 |
| Charlotte Productions Ltd | Information & communication | 2019 |
| Charlotte Randall Interiors Limited | Manufacturing | 2022 |
| Charly’Skitchen Ltd | Hospitality | 2020 |
| Charman Limited | Financial services | 2025 |
| Charnallies Ltd | Hospitality | 2022 |
| Charpentier Modi Ltd | Construction | 2025 |
| Charringtons Furnishing's Ltd | Wholesale & retail | 2017 |
| Chartwell Homes (Suffolk) Limited | Construction | 2016 |
| Charvis of Frinton Limited | Other services | 2014 |
| Chasai Property Limited | Real estate | 2025 |
| Chase Court Developments Ltd | Real estate | 2007 |
| Chase Diamond Tools International Limited | Manufacturing | 1992 |
| Chaselet Limited | Real estate | 1947 |
| Chasing the Hazard Ltd | Wholesale & retail | 2025 |
| Chateau Clements Limited | Wholesale & retail | 2025 |
| Chatham Group Ltd | Information & communication | 2016 |
| Chathurash Health Ltd | Health & social care | 2021 |