| Centerra Group (UK) Limited | London | 2019 |
| Central Ace Care UK Ltd | London | 2023 |
| Central Coating Solutions Ltd | Glasgow | 2025 |
| Central Fire Alarms UK Limited | London | 2010 |
| Central Studios Opco Limited | London | 2025 |
| Centre for Governance and Scrutiny | London | 2004 |
| Centre for International Security and Economic Strategy Limited | London | 2026 |
| Centre for Partnering Limited | Petersfield | 2018 |
| Centre for the Study of Wicked Problems Ltd | London | 2026 |
| Centre for Transitional Justice in SRI Lanka | Wembley | 2016 |
| Centred Care Living Ltd | Nottingham | 2022 |
| Centric Power Limited | Leicester | 2022 |
| Centrism Limited | Rotherham | 2010 |
| Centurion Fire Safety Solutions Limited | Sunderland | 2009 |
| Cerelia Tradings (Private) Limited | Oldham, United Kingdom | 2026 |
| Ceres Intelligence Ltd | London | 2026 |
| Cert Fire Ltd | Northampton | 2025 |
| Certafired Safety Ltd | Coulsdon | 2025 |
| Certified Professional Accountants' (CPA) Academy Ltd | London | 2022 |
| Certifireuk Ltd | London | 2023 |
| Certisafe Fire & Interiors Ltd | Nottingham | 2026 |
| Certisafe Passive Fire Systems Ltd | Wigston | 2025 |
| Cervus Defence and Security Limited | Bristol | 2013 |
| Cetam Ltd | Rotherham | 2022 |
| CFD Modelling Limited | Dartford | 2025 |
| CFE Fire Safety Ltd | Manston | 2024 |
| CFE UK Solutions Ltd | Barnet | 2019 |
| CGA Fire Ltd | Dagenham | 2022 |
| CH Compliance Services Limited | Lincoln | 2025 |
| CH2 Home Care Limited | Dudley | 2025 |
| Chakauya Ltd | Slough | 2026 |
| Chakirimedical Limited | Keighley | 2018 |
| Chakra Health Ltd | London | 2020 |
| Chalis Fire Engineering Limited | Dorchester | 2005 |
| Chalky Island Ltd | London | 2019 |
| Chambers Safety Service Ltd | Strood | 2023 |
| Champ Spares Revival Limited | Buckingham | 2012 |
| Chandi Care UK Ltd | Bracknell | 2024 |
| Change by Nude Health Ltd | Nuneaton | 2024 |
| Changing the Game CIC | London | 2013 |
| Channels and Choices Therapeutic Fostering Limited | Dover | 2013 |
| Chaplaincy Consultancy Services Ltd | London | 2022 |
| Chappell Safety Services Limited | Cardiff | 2012 |
| Chaps Healthcare Limited | Welingborough | 2024 |
| Charismatic Holy Spirit Limited | London | 2020 |
| Charles Joyner Limited | London | 2025 |
| Charles Safety Ltd | Weymouth | 2025 |
| Charlotte Barker Limited | Pulborough | 2024 |
| Charlotte Dove's Safety Solutions Limited | Peterlee | 2025 |
| Chartermark Construction Management Services Limited | Hollinwood | 2014 |
| Chas 2013 Limited | Morden | 2013 |
| Chasdei Esther | Woodford Green | 2017 |
| Chasta Healthcare Solutions Limited | Southampton | 2026 |
| Chatsworth Clinic Limited | Bristol | 2025 |
| Chatty Learning Ltd | Daresbury | 2012 |
| Chaudhary Security Ltd | Dagenham | 2018 |
| Chazezesa Medicals Limited | Merseyside | 2020 |
| Check Inventory Ltd | Epsom | 2025 |
| Checkacare Limited | Burgess Hill | 2025 |
| Cheetah RAM Ltd | Pontypool | 2022 |
| Chelmsford Romanian Community CIC | Chelmsford | 2024 |
| Chemring Energetics UK Limited | Stevenston | 2002 |
| Chemring Technology Solutions Limited | Romsey | 1980 |
| Chene Machkumbe Limited | Pontefract | 2022 |
| Cheromon Limited | London | 2024 |
| Cherry Blue Consultants UK Limited | Luton | 2019 |
| Cherry Project Management Ltd | Ipswich | 2025 |
| Cherry Virtual and Cyber Solutions Limited | Bromley | 2024 |
| Cherubim Cross Care Services Limited | Leicester | 2025 |
| Cherwell Leisure Limited | Duxbury Hall Road | 2001 |
| Cheshire Fire Door Inspections Limited | Wilmslow | 2025 |
| Cheshire Fire Safety Ltd | St. Helens | 2022 |
| Chess Consultants Ltd | Northampton | 2025 |
| Cheviot Oak Family Services Ltd | London | 2024 |
| Chevron Hospitality Maintenance Limited | Pontefract | 2025 |
| CHI Combat System Martial Arts Limited | Caterham | 2003 |
| Chiari - an Echo Network Ltd | Lytham St Annes | 2013 |
| Chiazoka Consulting Limited | Rainham | 2026 |
| Chibless Care Limited | Milton Keynes | 2023 |
| Chief Executives' Forum | Belfast | 2003 |
| Chief Fire Consultancy Ltd. | Newbury | 2016 |
| Chiicare Ltd | London | 2020 |
| Chil Fire and Property Management Ltd | Whitstable | 2024 |
| Child Rights and YOU UK | London | 2005 |
| CHILD1957 Child S.O.E. Ltd | Coventry | 2021 |
| Children’S Journey Ltd | Ilford | 2022 |
| Chilham's Future Delivery Board Limited | Chilham | 2007 |
| Chilotaservices Ltd | Plymouth | 2026 |
| Chiltern Fire Risk Solutions Ltd | High Wycombe | 2026 |
| Chimamanda Ltd | Dagenham | 2022 |
| Chimera Law Solutions Limited | Hull | 2025 |
| Chimsom Care Ltd | Harlow, Essex | 2022 |
| China Britain Trust for the Promotion of Buddhist Studies | London | 2018 |
| Chinedu AM Health Serve Limited | Telford | 2018 |
| Chiremba Limited | Nottingham | 2023 |
| Chiropody Care Ltd | Huddersfield | 2025 |
| Chisel PAY Ltd | London | 2024 |
| Chiso MUL Limited | Manchester | 2022 |
| Chizhavens Limited | Haverhill | 2025 |
| Chizzy's World Limited | London | 2023 |