| Cedar Mansions Ltd | Households | 2019 |
| Cedar Properties (South Yorkshire) Limited | Real estate | 2019 |
| Cedarwood Accountancy Limited | Professional & scientific | 2025 |
| CEE Properties Limited | Real estate | 2024 |
| CEE Sourcing Ltd | Administrative & support | 2018 |
| Ceilings Plus Limited | Construction | 2002 |
| CEK Transport Ltd | Transport & logistics | 2024 |
| CEL Investments Ltd | Financial services | 2024 |
| Celcoat Limited | Professional & scientific | 1990 |
| Celik Decoration Ltd | Construction | 2020 |
| Celine Transport Ltd | Transport & logistics | 2023 |
| Celine-Food Ltd | Hospitality | 2023 |
| Celix Ltd | Information & communication | 2025 |
| Cellcoat UK Ltd | Manufacturing | 2020 |
| Cellfactory UK Ltd | Professional & scientific | 2024 |
| Celluloid Screams Ltd | Information & communication | 2023 |
| Cellupure Limited | Wholesale & retail | 2025 |
| Celtic Social Ltd | Hospitality | 2025 |
| Celticfood Limited | Hospitality | 2026 |
| Census Holdings Limited | Financial services | 2006 |
| Census Limited | Construction | 1994 |
| Centenary Business Park Limited | Administrative & support | 2003 |
| Central European Aggregates Limited | Professional & scientific | 2004 |
| Central Executive Transfers Ltd | Transport & logistics | 2024 |
| Central Garage (Kiveton) Limited | Wholesale & retail | 2004 |
| Central Glass Limited | Manufacturing | 2013 |
| Central Monitoring Station Ltd | Administrative & support | 2011 |
| Central Network Supplies Ltd | Information & communication | 2016 |
| Central Training Partners Ltd | Education | 2024 |
| Central Travel Sheffield Limited | Transport & logistics | 2002 |
| Centralbid Residents Management Limited | Households | 1986 |
| Centre Barks @ Moscar Ltd | Other services | 2017 |
| Centre for Islamic Social Finance Limited | Professional & scientific | 2021 |
| Centre Stage Scenery Limited | Other services | 2024 |
| Centred Healthcare Limited | Health & social care | 2025 |
| Centreline Productions Ltd | Administrative & support | 2024 |
| Centreplain Limited | Construction | 1978 |
| Centrix Estates Limited | Real estate | 2002 |
| Centro Lettings Ltd | Real estate | 2020 |
| Centroco Developments Limited | Real estate | 1979 |
| Century Building Services (UK) Ltd | Construction | 2021 |
| Century Comms Limited | Information & communication | 2004 |
| Century House Holdings Limited | Financial services | 2017 |
| Century Motors (Sheffield) Limited | Wholesale & retail | 1960 |
| Century One Estates Limited | Real estate | 2018 |
| Century Space Limited | Real estate | 2011 |
| Century Street LLP | | 2020 |
| CEO Cutz Ltd | Other services | 2024 |
| CEO Motor Trading Ltd | Wholesale & retail | 2022 |
| Ceramicas Tiles Limited | | 1988 |
| Ceramisys EOT Limited | Professional & scientific | 2024 |
| Ceramisys Limited | Manufacturing | 2001 |
| Ceratizit UK & Ireland Limited | Wholesale & retail | 1999 |
| Cerberus Automotive Limited | Wholesale & retail | 2020 |
| Cerebral Agency Limited | Information & communication | 2016 |
| Cerebro Ltd | Health & social care | 2018 |
| Ceres Growth Limited | Wholesale & retail | 2024 |
| Cerex Limited | Wholesale & retail | 2002 |
| Cerimasters Ltd | Hospitality | 2021 |
| Cerra Ventures Limited | Real estate | 2026 |
| Certa Cito Global Ltd | Professional & scientific | 2024 |
| Certa-Nutrition Ltd | Manufacturing | 2025 |
| Certified Social Ltd | Professional & scientific | 2026 |
| Cervenak Couriers Limited | Transport & logistics | 2025 |
| Ceso Consulting Ltd | Professional & scientific | 2023 |
| Cessford Leisure Ltd | Hospitality | 2025 |
| Ceyara Ltd | Wholesale & retail | 2025 |
| Ceylanoglu Ltd | Wholesale & retail | 2022 |
| Ceylanoglu Properties Ltd | Real estate | 2025 |
| CFA Group Limited | Financial services | 2018 |
| CFC Accountancy Services Limited | Professional & scientific | 1998 |
| CFD Technologies Ltd | Professional & scientific | 2017 |
| CFR Group Limited | Arts & recreation | 2020 |
| CFR Property Management Limited | Real estate | 2022 |
| CFS Formulation Services Ltd | Wholesale & retail | 2025 |
| CFS Investments Ltd | Hospitality | 2020 |
| CG & a Property Services Ltd | Construction | 2012 |
| CG Evans Limited | Professional & scientific | 2006 |
| CG Motorz Ltd | Wholesale & retail | 2023 |
| CG Pipework Ltd | Construction | 2015 |
| CGB Flooring Limited | Wholesale & retail | 2025 |
| Cgbuilding Services Limited | Construction | 2024 |
| Cgee Care Limited | Health & social care | 2019 |
| CGF Carpets & Flooring Ltd | Construction | 2025 |
| CGJ Consulting Limited | Professional & scientific | 2023 |
| CGM Electrical Ltd | Construction | 2025 |
| CGT Bathroom Solutions Ltd | Construction | 2018 |
| Cgtg Limited | Administrative & support | 2018 |
| CH Jewellery Ltd | Manufacturing | 2011 |
| CH Tyre Ltd | Wholesale & retail | 2025 |
| CH80 Consultancy Ltd | Professional & scientific | 2020 |
| CHA CHA Chai Sheff Ltd | Hospitality | 2024 |
| CHA Ting Catering Investment Limited | Hospitality | 2023 |
| Chaat & Roll Co. Ltd | Hospitality | 2025 |
| Chad Future Impact CIC | Education | 2024 |
| Chadha's Enterprise Limited | Wholesale & retail | 2013 |
| Chadha's Properties Limited | Real estate | 2023 |
| Chafer Machinery Limited | Manufacturing | 2000 |
| Chaffinch Housing Ltd | Real estate | 2025 |
| Chaffinch Radiology Reporting Ltd | Health & social care | 2022 |