| Firwood Lodge Management Co. Limited | Households | 1983 |
| Fisher Lake AI Ltd | Manufacturing | 2025 |
| Fisher Property Partnership LLP | | 2015 |
| Fitzwilliam House (Clapham) Management Company Limited | Households | 2008 |
| Five Hammers Ltd. | Information & communication | 2008 |
| Fiveoak Resin Ltd | Construction | 2026 |
| Fix-It and SON Scaffolding Ltd | Construction | 2019 |
| Fixio Kent Limited | Information & communication | 2014 |
| Fixlink Ltd | Construction | 2016 |
| FJI Limited | Real estate | 2016 |
| FJW Holdings Ltd | Financial services | 2021 |
| FJW Sports Ltd | Wholesale & retail | 2001 |
| FL Capital Holdings Limited | Administrative & support | 2000 |
| FL Capital Properties Limited | Administrative & support | 2013 |
| Flamevilla Ltd | Hospitality | 2025 |
| Flarepeople Limited | Professional & scientific | 2025 |
| Flashing Lights Media Limited | Information & communication | 2015 |
| Flashtax Ltd | Information & communication | 2026 |
| Flats 1-14, Grosvenor Court RTM Company Limited | Households | 2020 |
| Fleetwood Stack Solutions Limited | Information & communication | 2022 |
| Fletcher Investment Holdings Limited | Professional & scientific | 2025 |
| Fletching Green Developments Ltd | Construction | 2025 |
| Flicka 24/7 Deep Cleaning Company Limited | Administrative & support | 2020 |
| Flight FOX Interiors Limited | Construction | 2017 |
| Flightvectors Ltd | Manufacturing | 2023 |
| Flinch Group Ltd | Professional & scientific | 2017 |
| Flint Timber (Bromley) Limited | Real estate | 1977 |
| Float Structures Limited | Professional & scientific | 2022 |
| Florafield Limited | Agriculture & fishing | 2001 |
| Florastina Limited | Wholesale & retail | 2014 |
| Florence Business Solutions Limited | Administrative & support | 2017 |
| Flow Figures Limited | Manufacturing | 2025 |
| Flow Salon Ltd | Other services | 2022 |
| Flow Tunbridge Wells Limited | Other services | 2006 |
| Flowerlux Limited | Wholesale & retail | 2008 |
| Flowersmiths at the Pavilion Ltd | Wholesale & retail | 2021 |
| Fluid Business Solutions Ltd | Information & communication | 2014 |
| Flying Fish Properties Limited | Real estate | 2015 |
| Flying Kites Limited | Information & communication | 2008 |
| Flyingmachines Creative Ltd | Professional & scientific | 2012 |
| Fmqstudio Ltd | Professional & scientific | 2025 |
| FN-21 Ltd | Professional & scientific | 2025 |
| Fogel Fencing Limited | Construction | 2025 |
| Folia Space Ltd | Real estate | 2026 |
| Folio Partners Limited | Professional & scientific | 2006 |
| Follow ME TV UK and EU Limited | Information & communication | 2015 |
| Follow the Sun Soaps UK Limited | Wholesale & retail | 2024 |
| Fonthill Limited | Manufacturing | 2009 |
| Food About YOU Limited | Hospitality | 2019 |
| Food for Thought (Cranbrook) Limited | Hospitality | 2013 |
| Foodzotix Ltd | Hospitality | 2025 |
| Foot Davson Ltd | Professional & scientific | 2013 |
| Foot Davson Trustees Limited | Administrative & support | 1994 |
| Foqus Limited | Professional & scientific | 1994 |
| Forbes Financial Limited | Administrative & support | 2007 |
| Forbes Logic Limited | Information & communication | 2010 |
| Fordcombe Preschool Limited | Health & social care | 2023 |
| Fordhook Studio Ltd | Information & communication | 2025 |
| Forefront Finance Ltd | Financial services | 2009 |
| Forefront Property Development and Maintenance Ltd | Construction | 2019 |
| Forest CRM Ltd | Information & communication | 2015 |
| Foresters Apparel Limited | Wholesale & retail | 2022 |
| Foresters Holdings Limited | Financial services | 2022 |
| Forge Garage Repairs Limited | Wholesale & retail | 2002 |
| Forge Steel Installations Ltd | Construction | 2015 |
| Forgetdent Ltd | Health & social care | 2025 |
| Form and Theory Films Ltd | Information & communication | 2021 |
| Form Architectural Limited | Extraterritorial | 2011 |
| Form Media Limited | Information & communication | 2021 |
| Formative Consultancy Limited | Professional & scientific | 2020 |
| Former Ocean Assets Limited | Professional & scientific | 2007 |
| Forrest Business Group Ltd | Other services | 2018 |
| Fort Knox Security Limited | Manufacturing | 2002 |
| Forte Bailey (Southborough) Limited | Real estate | 2016 |
| Forthview Project Controls Limited | Professional & scientific | 2026 |
| Fortnet UK Ltd | Information & communication | 2020 |
| Fortress Realisations Limited | Extraterritorial | 2013 |
| Fortuna Consulting Ltd | Professional & scientific | 2022 |
| Fortuna Fields Estate Management Company Limited | Households | 2025 |
| Forum Music & Arts C.I.C. | Hospitality | 2009 |
| Fougere Limited | Real estate | 2022 |
| Foundation Creative Agency Ltd | Professional & scientific | 2024 |
| Four to Eleven Cambridge House Limited | Households | 2024 |
| Four Whys Ltd | Professional & scientific | 2026 |
| FOURD4 Ltd | Professional & scientific | 2018 |
| Fourteen Arrows Ltd | Hospitality | 2022 |
| Fourteen Arrows Tattoo Ltd | Arts & recreation | 2023 |
| Fourteen Forty Communications Limited | Professional & scientific | 2017 |
| Fourth Drawer Limited | Arts & recreation | 2026 |
| Fowler & Hammond LLP | | 2003 |
| FOX & FOX Mayfield LLP | | 2010 |
| FOX & FOX Vineyards LLP | | 2003 |
| FOX Digital Print Limited | Manufacturing | 2017 |
| FOX Fernley Landscape Office LLP | | 2015 |
| FOX Managed Solutions Limited | Manufacturing | 2017 |
| FOX Media Group Limited | Financial services | 2017 |
| FOX Natural Capital Partners LLP | | 2019 |
| Foxwell Estates Ltd. | Real estate | 1991 |
| FOY (Peckham) Limited | Hospitality | 2025 |
| FPL Property Services Ltd | Real estate | 2017 |