| Filmed by Limited | Administrative & support | 2026 |
| Films.Gb Ltd | Real estate | 2002 |
| Finance Cornwall Equity Fund | | 2002 |
| Finance Devon Limited | Extraterritorial | 1999 |
| Find ME on the Internet Ltd | Information & communication | 2012 |
| Findy Group Ltd | Professional & scientific | 2025 |
| Fine Art Prints on Demand Limited | Wholesale & retail | 2005 |
| Fine Online Limited | Extraterritorial | 2016 |
| Finestyle Planning Limited | Professional & scientific | 2023 |
| Finney Holdings Limited | Wholesale & retail | 2018 |
| Fire Safety Cornwall Ltd | Public administration | 2017 |
| Firegrass Communications Ltd | Professional & scientific | 2010 |
| First International Lending Limited | Financial services | 2023 |
| First Spark LLP | | 2013 |
| Fisherman's Arms Newlyn Ltd | Hospitality | 2022 |
| Fistral Beach Ltd | Arts & recreation | 2004 |
| Fit 'N' FUN Kids (Cornwall) Limited | Health & social care | 2003 |
| Fixer Property and Management Limited | Households | 2013 |
| Flat Dog Productions Limited | Information & communication | 2000 |
| Flavorscape Meals Limited | Hospitality | 2025 |
| Flawless Floors Cornwall Ltd | Households | 2023 |
| Flint Energy Ltd | Construction | 2022 |
| FLO Cornwall Developments Ltd | Construction | 2023 |
| FLO Cornwall Screed Specialists Ltd | Construction | 2019 |
| FLO Plant Hire Limited | Administrative & support | 2023 |
| Flock Ventures Limited | Administrative & support | 2025 |
| Floodmatik Ltd | Professional & scientific | 2005 |
| Flora Gardens (Helston) Management Company Limited | Households | 2007 |
| Flora Property (SW) Limited | Real estate | 2026 |
| Flourish Cafe Ltd | Extraterritorial | 2020 |
| Floyd Capital Ltd | Financial services | 2014 |
| Flushing Ferry Limited | Transport & logistics | 2006 |
| Fman Group Ltd | Information & communication | 2024 |
| Follands Folly Limited | Energy | 2011 |
| Food&Dairy Ltd | Manufacturing | 2020 |
| Force VR Ltd | Information & communication | 2018 |
| Foresight Construction Ltd | Construction | 2014 |
| Forest and Mint Ltd | Wholesale & retail | 2026 |
| Forest Wood Floors Ltd | Manufacturing | 2024 |
| Forestry UK Limited | Agriculture & fishing | 2009 |
| Forever Flawless Aesthetics by JO Ltd | Other services | 2019 |
| Forever Pawz Limited | Other services | 2024 |
| Forging Forward Limited | Real estate | 1952 |
| Formtech (UK) Ltd | Manufacturing | 2007 |
| Formulate Developments Ltd | Construction | 2015 |
| Formulate Properties Ltd | Construction | 2020 |
| Fort Gardens (Plymouth) Management Company Limited | Households | 2018 |
| Fortdown Developments Limited | Construction | 2012 |
| Fortyfoursixteen Limited | Information & communication | 2007 |
| Forum Assessments Limited | Other services | 2007 |
| Forward Glass Limited | Manufacturing | 1990 |
| Foundry Elementia Limited | Information & communication | 2026 |
| Foundry House Management Company Limited | Households | 2014 |
| Foundry Parc Apartments Management Company Limited | Households | 2012 |
| Foundry Parc Railway Apartments Management Company Limited | Households | 2015 |
| Four Hares Ltd | Education | 2020 |
| Four Monkeys Records Ltd | Arts & recreation | 2022 |
| Four SEE Ltd | Professional & scientific | 2025 |
| FOX and Hound Scorrier Limited | Hospitality | 2026 |
| FOX Construction Solutions Limited | Construction | 2014 |
| Fprl Ltd | Information & communication | 2021 |
| Frances Property Management Limited | Real estate | 2000 |
| Francis Maitland Property Limited | Real estate | 2023 |
| Fraser Perpetual Limited | Professional & scientific | 2019 |
| Frazer Haircutters Ltd | Other services | 2011 |
| French Chateau Weddings Limited | Hospitality | 2018 |
| French Construction (Cornwall) Limited | Construction | 2020 |
| Fresh Produce Advisory Limited | Agriculture & fishing | 2011 |
| Friendly Manager Limited | Information & communication | 2019 |
| From Idea to Independence Ltd | Education | 2025 |
| Fuel Drain Specialist Limited | Wholesale & retail | 2025 |
| Fuelstretcher Limited | Manufacturing | 2001 |
| Full Glow Soul Ltd | Other services | 2025 |
| Fully Coded Solutions Limited | Information & communication | 2013 |
| Funktionhaus Ltd | Construction | 2025 |
| Funky Media Ltd | Information & communication | 2021 |
| Furze Alpine Holdings Limited | Financial services | 2020 |
| Future Construction SW Ltd | Construction | 2019 |
| Future Energy Partners Limited | Public administration | 2012 |
| Future Form Group Limited | Financial services | 2025 |
| Future Terrains International Ltd | Professional & scientific | 2022 |
| Fwcm Limited | Professional & scientific | 2012 |
| G G Holiday Lets Limited | Administrative & support | 2017 |
| G H Buildings Limited | Real estate | 2025 |
| G P Events Cornwall Limited | Administrative & support | 2024 |
| G Pruen Yacht Finishing Ltd | Manufacturing | 2015 |
| G.A. Furr Limited | Real estate | 1977 |
| Gaia Skincare Limited | Administrative & support | 2012 |
| Gaia Spa Developments Limited | Extraterritorial | 2012 |
| Gaia Spa Limited | Extraterritorial | 2012 |
| Gainsborough Recruitment Ltd | Administrative & support | 2020 |
| Gall Real Estate Limited | Real estate | 2026 |
| Galleon Court (Charlestown) Management Company Limited | Households | 2006 |
| Gambaro Ltd | Transport & logistics | 2025 |
| Gambiers Limited | Real estate | 1998 |
| Ganden Ling Kadampa Meditation Centre | Other services | 2000 |
| Gandhi Truro Ltd | Hospitality | 2026 |
| Gani Productions Ltd | Information & communication | 2023 |
| Gannock Park Developments Limited | Construction | 2003 |
| GAP Drainage Limited | Administrative & support | 2005 |