| City Gate Construction (Scotland) Limited | | | workplace safety or health violation | 2020 | UK-HSE | £0 |
| City Gate Construction (Scotland) Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| City Gate Construction (Scotland) Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| City Gate Construction (Scotland) Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| City Hospitals Sunderland Foundation NHS Trust | | | workplace safety or health violation | 2012 | UK-HSE | £7,582 |
| City of London College Centre for Advanced Studies | | | care quality violation | 2018 | UK-OFSTED | £0 |
| City of London Corporation | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| City Property (Glasgow) LLP | | | workplace safety or health violation | 2022 | UK-HSE | £200,000 |
| City Salvage Ltd | | | workplace safety or health violation | 2019 | UK-HSE | £0 |
| City Scrap Limited | | | workplace safety or health violation | 2011 | UK-HSE | £28,965 |
| City Screen Printers (U.K.) Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| City Vision Construction Limited | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| City Vision Construction Limited | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| City West Works Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| City West Works Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| City Wheel Refurbishment Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| City Wheel Refurbishment Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| Citygate Holdings Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| CJL Bricklaying Contractors Limited | | | workplace safety or health violation | 2019 | UK-HSE | £0 |
| CJN Concept Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| CK International Limited | | | workplace safety or health violation | 2022 | UK-HSENI | £0 |
| CKMR Contracts Ltd | | | workplace safety or health violation | 2021 | UK-HSENI | £30,000 |
| CKStone Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| CKStone Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| CKStone Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| Clad Build UK Limited | | | workplace safety or health violation | 2023 | UK-HSE | £57,000 |
| Cladceil Limited | | | workplace safety or health violation | 2016 | UK-HSE | £59,184 |
| Cladceil Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| Cladrite Limited | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| Clady Quarry | | | workplace safety or health violation | 2019 | UK-HSENI | £0 |
| Clady Quarry | | | workplace safety or health violation | 2019 | UK-HSENI | £0 |
| Clairehill Plastics Limited | | | workplace safety or health violation | 2012 | UK-HSENI | £8,000 |
| Clan Contracting Limited | | | workplace safety or health violation | 2020 | UK-HSE | £0 |
| Clancy Docwra Limited | | | workplace safety or health violation | 2014 | UK-HSE | £1,108,502 |
| Clansman Dynamics Limited | | | workplace safety or health violation | 2020 | UK-HSE | £0 |
| Clanville Sawmills Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clanville Sawmills Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clanville Sawmills Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clanville Sawmills Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clanville Sawmills Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Claragh Homes | | | workplace safety or health violation | 2022 | UK-HSENI | £0 |
| Claragh Homes | | | workplace safety or health violation | 2022 | UK-HSENI | £0 |
| Clare Lallow Limited | | | workplace safety or health violation | 2011 | UK-HSE | £2,000 |
| Claremont Designs Ltd | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Claremont Group Interiors Limited | | | workplace safety or health violation | 2017 | UK-HSE | £0 |
| Claremont Joinery North East Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Claremont Joinery North East Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Claremont Motor Engineers (Dartford) Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| Claremont Nursery | | | care quality violation | 2022 | UK-OFSTED | £0 |
| Clarence House March | | | care quality violation | 2022 | UK-OFSTED | £0 |
| Clarendon Food Company Limited | | | workplace safety or health violation | 2022 | UK-HSE | £45,344 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Claridge One-Stop Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarity Independent School | | | care quality violation | 2023 | UK-OFSTED | £0 |
| Clark & Sutherland Limited | | | workplace safety or health violation | 2017 | UK-HSE | £0 |
| Clark & Sutherland Limited | | | workplace safety or health violation | 2017 | UK-HSE | £0 |
| Clark & Sutherland Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clark Brothers (Builders & Developers) Limited | | | workplace safety or health violation | 2012 | UK-HSE | £11,864 |
| Clark Gough Joinery Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clark Homes Limited | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| Clark Masts Teksam Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clark Masts Teksam Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clark Masts Teksam Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clark Technologies Wales Ltd | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clark Transport Limited | | | workplace safety or health violation | 2016 | UK-HSE | £0 |
| Clarke & Co Property Ltd | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clarke Group Construction Limited | | | workplace safety or health violation | 2017 | UK-HSE | £0 |
| Clarke Lane Engineering Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clarke Lane Engineering Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clarke Lane Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarke Lane Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarke Lane Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarke Telecom Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clarke Tin Whistle Company Limited(The) | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| Clarke Tin Whistle Company Limited(The) | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| Clarke's Environmental Limited | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Clarke-Rendall Business Furniture Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarkes of Bowley Ltd | | | workplace safety or health violation | 2023 | UK-HSE | £0 |
| Clarks (Wantage) Limited | | | workplace safety or health violation | 2019 | UK-HSE | £0 |
| Clarks Construction Limited | | | workplace safety or health violation | 2013 | UK-HSE | £3,963 |
| Clarks Pies Ltd | | | workplace safety or health violation | 2019 | UK-HSE | £0 |
| Clarks Pies Ltd | | | workplace safety or health violation | 2019 | UK-HSE | £0 |
| Clarkson Joinery & Furniture Ltd | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarkwood Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarkwood Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarkwood Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarkwood Engineering Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Clarman Joinery (Lincoln) Ltd | | | workplace safety or health violation | 2020 | UK-HSE | £0 |
| Clarman Joinery (Lincoln) Ltd | | | workplace safety or health violation | 2020 | UK-HSE | £0 |
| Clarus Homes (HOP POCKET) Limited | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| Clarus Homes (HOP POCKET) Limited | | | workplace safety or health violation | 2017 | UK-HSE | £0 |
| CLARUS SOLUTIONS LIMITED | | | workplace safety or health violation | 2021 | UK-HSE | £0 |
| Clarus Solutions Limited | | | workplace safety or health violation | 2022 | UK-HSE | £0 |
| Classic Barfitting Ltd. | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
| Classic Barfitting Ltd. | | | workplace safety or health violation | 2018 | UK-HSE | £0 |
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