| CSH Electrical Contractors Ltd | Construction | 2021 |
| Cuddra Skate Limited | Construction | 2024 |
| Currendon Garages Limited | | 1964 |
| Cycle Logic Limited | Wholesale & retail | 2007 |
| D Nottle Scaffolding Limited | Construction | 2006 |
| D7 Enterprises Limited | Wholesale & retail | 1995 |
| Dakota Shine (UK) Limited | Manufacturing | 2004 |
| Dale Isbell Construction Limited | Construction | 2007 |
| Data Talks Limited | Real estate | 1997 |
| Dave Peat Waste Limited | Water & waste | 1998 |
| David Parish Menswear Ltd | Wholesale & retail | 2002 |
| Davies Groundworks Limited | Construction | 2007 |
| Delaviews Limited | | 1973 |
| Demelzas (Penzance) Limited | | 1983 |
| Dennis Barnicoat and SON Ltd | Professional & scientific | 2002 |
| Denovo Retail Limited | Wholesale & retail | 2017 |
| DH Investment Property Ltd | Real estate | 2024 |
| Digital Peninsula Network Limited | Other services | 2001 |
| Dinham Farm Holidays Limited | Hospitality | 2006 |
| Dinneres Trading Company Limited | Wholesale & retail | 2002 |
| Direct Welding Limited | Manufacturing | 2000 |
| Discovery Quay Enterprises (Trading) Limited | Wholesale & retail | 2002 |
| Discovery Quay Enterprises Limited | Real estate | 1999 |
| DJR Roof Trusses Limited | Manufacturing | 1984 |
| Door Stop (South West) Limited | Construction | 2000 |
| Dorset Down Sheep Breeders' Association(The) | Other services | 1905 |
| Dovey Premier Products Limited | Hospitality | 2020 |
| Downs Farm Limited | Water & waste | 2002 |
| Drayton Mere Properties Ltd | Real estate | 2023 |
| Dream Boat Property Management Limited | Real estate | 2006 |
| Dredging Marine (South West) Limited | | 1981 |
| Drummer Developments Limited | Construction | 1999 |
| Duchy China Limited | | 1987 |
| Duchy Fabrications Limited | Manufacturing | 2003 |
| Duloe Jubilee Community Centre Limited | Hospitality | 2006 |
| Duporth Residents Ltd | Real estate | 2006 |
| E L Tonkin & Sons Limited | Construction | 1971 |
| East Cornwall Garage Limited | Manufacturing | 2002 |
| Eastone Recordings C.I.C. | Arts & recreation | 2013 |
| EAT Art Limited | Manufacturing | 2002 |
| Ebony Consulting Limited | Professional & scientific | 2001 |
| Ecological Press Limited | Wholesale & retail | 1989 |
| Ecometals Cornwall Limited | Extraterritorial | 2021 |
| Eden Project Campaigns Limited | Education | 2010 |
| Eden Project Limited | Education | 1996 |
| Edward Bence Hotels Limited | Professional & scientific | 2003 |
| Electrospace Developments Limited | | 1981 |
| Elephant Walk Properties Limited | Real estate | 1973 |
| Elevate Minerals Limited | Mining & quarrying | 2021 |
| EMB Aviation Limited | Manufacturing | 2008 |
| Energy Access (Southwest) Limited | Professional & scientific | 2006 |
| England Property Management Limited | Real estate | 2007 |
| Enterprise Garage (ST Columb) Limited | Wholesale & retail | 1962 |
| Entropy Partners Limited | Professional & scientific | 2005 |
| Eric Distin Financial Services Limited | Extraterritorial | 1985 |
| Essendon Advisors Ltd | Professional & scientific | 2016 |
| Estate Management 117 Limited | Real estate | 2004 |
| European Converting Machinery | | 1998 |
| Ex-Press S W Limited | Manufacturing | 2001 |
| F & K Electrical & Refrigeration Limited | Manufacturing | 2004 |
| F D Hall and SON Limited | Manufacturing | 2003 |
| Fairfield Country Rest Home Limited | Health & social care | 2020 |
| Falmouth Boat Construction Limited | Manufacturing | 1970 |
| Falmouth Water Sports Association | Arts & recreation | 1992 |
| Farm Cuddra Ltd | Hospitality | 2023 |
| Farrington Ravenscroft Partnership Limited | | 2003 |
| Fascinuk Limited | Arts & recreation | 2002 |
| Favournotice Limited | | 1992 |
| Fee-Only Planning Limited | Professional & scientific | 2001 |
| Felicity Cottages Limited | Hospitality | 2023 |
| Felt Branding Limited | Professional & scientific | 2007 |
| Ferndale Developers (Cornwall) Limited | Construction | 2007 |
| Fieldhead Hotel Management Limited | Hospitality | 2024 |
| Finn Consultants Limited | Information & communication | 2005 |
| First City Rental Limited | Administrative & support | 2001 |
| FJ Sleeman and SON Limited | Construction | 2006 |
| Flann Microwave Limited | Manufacturing | 1956 |
| Flavour Productions Limited | Wholesale & retail | 2004 |
| Flora Motors (Cornwall) Ltd. | Wholesale & retail | 1997 |
| Flora Motors (Turnpike) Limited | Wholesale & retail | 2005 |
| Focus Educational Software Limited | Information & communication | 1998 |
| Forhawk Limited | Transport & logistics | 2000 |
| Foulkes Properties Limited | Real estate | 2018 |
| Francis Hotels (UK) Limited | Hospitality | 2003 |
| Frantic | Arts & recreation | 2000 |
| Freetek Ltd | Information & communication | 1998 |
| Froomies Limited | Hospitality | 2025 |
| Future Property Sales Limited | Real estate | 2005 |
| G M Computer Systems Limited | Information & communication | 2001 |
| G Osborne Limited | Professional & scientific | 2003 |
| G.J. Hendra Limited | Wholesale & retail | 1977 |
| Gaiatek Consultants Ltd | Information & communication | 1995 |
| Galbraiths Ventures Limited | Real estate | 2002 |
| Gardiner & Gardiner Limited | Professional & scientific | 2008 |
| Gardinia Windows (South West) Limited | | 1981 |
| Gary Taberer Limited | Construction | 2002 |
| Gazgolf Limited | Real estate | 2008 |
| GCB Management Ltd | Professional & scientific | 2008 |
| GCL 2016 Limited | Wholesale & retail | 2016 |
| Gentle Dental UK Limited | Health & social care | 2006 |