| Fenvale Limited | Information & communication | 2010 |
| Fermat Capital Management (U.K.) Limited | Financial services | 2022 |
| Fernando Care Limited | Health & social care | 2015 |
| Fernlea Community PRE School | Education | 2011 |
| Field Training Services Limited | Health & social care | 2000 |
| Findperfect Solutions Limited | Professional & scientific | 2013 |
| Fine Celebrations Limited | Other services | 2016 |
| Finpeak Accounting & Bookkeeping Ltd | Professional & scientific | 2025 |
| Finsight Education Limited | Professional & scientific | 2025 |
| Firefly Group International Ltd | Professional & scientific | 2022 |
| Fireline Cleaning Systems Ltd | Administrative & support | 2026 |
| First Step Consultancy Limited | Education | 2023 |
| Fish School of Motoring Ltd | Education | 2010 |
| Fishtail Mortgages Limited | Financial services | 2024 |
| Fishtail Property Solutions Ltd | Real estate | 2024 |
| Fist Design Ltd | Arts & recreation | 2019 |
| Fitch Fabrications Ltd | Manufacturing | 2010 |
| Fitzmaurice-Kemp Consulting Limited | Professional & scientific | 2013 |
| FJ Credit Management Ltd | Professional & scientific | 2024 |
| Flash Drop Limited | Transport & logistics | 2025 |
| Fleet Physiotherapy Limited | Health & social care | 2015 |
| Fleet PJ Limited | Hospitality | 2016 |
| Fleet Shop Ltd | Professional & scientific | 2023 |
| Fleet Station Taxis Limited | Transport & logistics | 2012 |
| Fletcher Fabrications Group UK Ltd | Manufacturing | 2008 |
| Flex Construction Limited | Construction | 2007 |
| Flex Construction Services Ltd | Real estate | 2022 |
| Flex J Holdings Limited | Financial services | 2024 |
| Flex Recovery Limited | Wholesale & retail | 2021 |
| Flexbeetle Products Ltd | Wholesale & retail | 2021 |
| Flexi-Tank (Global) Limited | Professional & scientific | 2012 |
| Flexjet Operations Limited | Transport & logistics | 2008 |
| Flexoplast Limited | Manufacturing | 2025 |
| Flexray Ltd | Wholesale & retail | 2025 |
| Flodman Electrical Limited | Construction | 2020 |
| Floorways Limited | Construction | 2006 |
| Flow Inc. Ltd | Professional & scientific | 2018 |
| Flow State Marketing Ltd | Public administration | 2020 |
| Fluid Financial Consulting Ltd | Professional & scientific | 2014 |
| Fluor Finance Limited | Other services | 2022 |
| Fluor International Limited | Administrative & support | 1978 |
| Fluor Limited | Professional & scientific | 1976 |
| Fluor Pension Trustee Limited | Financial services | 2018 |
| Fluor Projects Limited | Administrative & support | 2007 |
| Fluor Workforce Solutions Limited | Administrative & support | 2000 |
| Fluxon Plumbing Limited | Construction | 2026 |
| Fluxstride Ltd | Information & communication | 2024 |
| Flyertech Limited | Transport & logistics | 2001 |
| FN Accounting Services Limited | Professional & scientific | 2013 |
| Folk Dancing Ltd | Arts & recreation | 2023 |
| Folw Ltd | Wholesale & retail | 2021 |
| Fone World Plus Ltd | Wholesale & retail | 2024 |
| Footprintiq Ltd | Information & communication | 2023 |
| FOR COD Sake Food Ltd | Hospitality | 2023 |
| FOR COD Sake Online Limited | Hospitality | 2025 |
| Forethought Events Limited | Professional & scientific | 2022 |
| Forster Consultants Ltd | Professional & scientific | 2024 |
| Fortify-Services CIC | Administrative & support | 2020 |
| Fortifyguard Ventures Ltd | Information & communication | 2024 |
| Fortucare Ltd | Administrative & support | 2026 |
| Fortuhub Ltd | Transport & logistics | 2025 |
| Fortuwest Academy Ltd | Education | 2025 |
| Fortuwest Global Ltd | Education | 2025 |
| Fortuwest International Ltd | Administrative & support | 2021 |
| Fortuwest International Training and Education Ltd | Education | 2024 |
| Founder Systems Limited | Professional & scientific | 2025 |
| FOX Red Consulting Ltd | Information & communication | 2026 |
| FOX Trade & Investment Ltd | Wholesale & retail | 2024 |
| Fox-Beckett Independent Estate Agents Ltd | Real estate | 2020 |
| Foxtrot AI Ltd | Information & communication | 2025 |
| FP HR Consultancy Limited | Administrative & support | 2018 |
| Francesco Fraioli Ltd | Health & social care | 2023 |
| Frankham (Coningsby) Limited | Households | 2019 |
| Frankham Management Limited | Households | 2018 |
| Franklin Topco Limited | Information & communication | 2021 |
| Frauscher UK Limited | Wholesale & retail | 2010 |
| Freight Products (U.K.) Limited | Manufacturing | 2004 |
| Frimdoc Limited | Health & social care | 2013 |
| Front ROW Travel Limited | Administrative & support | 2025 |
| Frontline Project Management Ltd | Administrative & support | 2008 |
| Froth N Flavour Ltd | Hospitality | 2024 |
| FSO Productions Ltd | Arts & recreation | 2019 |
| FSS Group Ltd | Administrative & support | 2024 |
| Fusion Business Management Limited | Professional & scientific | 2022 |
| Future Frame Build Limited | Construction | 2025 |
| Fwpjv Limited | Administrative & support | 2010 |
| Fyter Wellness Ltd | Wholesale & retail | 2024 |
| G & J Associates Limited | Real estate | 2018 |
| G J Plumbing & Heating Ltd | Construction | 2018 |
| G W Kirkland Ltd | Professional & scientific | 2018 |
| G&R Investors Ltd | Real estate | 2024 |
| G20 Heating & Plumbing Ltd | Construction | 2020 |
| G6PKT Ltd | Wholesale & retail | 2021 |
| G9 Entertainments Ltd | Arts & recreation | 2022 |
| GA Robertson Holdings Ltd | Professional & scientific | 2013 |
| Galf Retro Furniture Ltd | Wholesale & retail | 2022 |
| Gallantry Media Ltd | Professional & scientific | 2026 |
| Galzaga Property Investments Ltd | Real estate | 2022 |
| Gama Aviation (Asset 2) Limited | Transport & logistics | 2013 |
| Gama Aviation (Engineering) Limited | Manufacturing | 2011 |