| Feel Like Home Care Service Limited | Health & social care | 2024 |
| Feel Secure Systems Ltd | Administrative & support | 2012 |
| FEH 2021 Limited | Administrative & support | 2018 |
| Feher Trans Limited | Transport & logistics | 2018 |
| Fehr Brothers Limited | Wholesale & retail | 2011 |
| Fehr Commercial Ltd | Real estate | 2024 |
| Felder UK Limited | Wholesale & retail | 1999 |
| Felix RAM Holdings Ltd | Financial services | 2022 |
| Femcom Transport Limited | Transport & logistics | 2015 |
| Femoclean Ltd | Administrative & support | 2019 |
| Femronk Solutions Limited | Health & social care | 2021 |
| Femtech Heating Services Ltd | Construction | 2011 |
| Fenagh Construction Services Ltd | Construction | 2015 |
| Fences Farm Tyringham Limited | Agriculture & fishing | 2022 |
| Fenland Fire Contracts Limited | Manufacturing | 1997 |
| Fera Construction Ltd | Construction | 2022 |
| Ferall Ltd | Transport & logistics | 2021 |
| Feranare Limited | Professional & scientific | 2006 |
| Feras Construction Ltd | Construction | 2023 |
| Ferdia Civil Engineering Ltd | Construction | 2014 |
| Fergus Maher Construction Limited | Construction | 2018 |
| Ferguson House Management Company Limited | Households | 2005 |
| Fernandes and Sons Ltd | Transport & logistics | 2022 |
| Fernsby Roofing & Damp Specialists Ltd | Construction | 2026 |
| Fernwood Developments (MK) Limited | Real estate | 2006 |
| Ferozi Solution & Services Limited | Wholesale & retail | 2025 |
| Ferrars Academy | Education | 2012 |
| Fetch Sports Ltd | Wholesale & retail | 2022 |
| Fetchflare Limited | Wholesale & retail | 2025 |
| FF Brothers Limited | Wholesale & retail | 2019 |
| FF Records Ltd | Other services | 2024 |
| FFC Foods Limited | Wholesale & retail | 2019 |
| Ffkhan Courier Ltd | Administrative & support | 2019 |
| FFR Properties Limited | Real estate | 2025 |
| FGJ Fese Ltd | Information & communication | 2025 |
| FGS Trading Ltd | Wholesale & retail | 2025 |
| FH Project Management Ltd | Professional & scientific | 2024 |
| FH Red Rooster Ltd | Hospitality | 2020 |
| FH Technologies Ltd | Information & communication | 2019 |
| Fhfamily Media Limited | Professional & scientific | 2025 |
| Fhia Holdings Ltd | Hospitality | 2023 |
| Fiberfast Ltd | Construction | 2025 |
| Fibforge Ltd | Real estate | 2024 |
| Fibre Connections Ltd | Information & communication | 2026 |
| Fibre Optic IQ Ltd | Information & communication | 2025 |
| Fiducia Holdings Limited | Real estate | 2023 |
| Fifi Care Ltd | Health & social care | 2019 |
| Fifty Trades of Skinner Ltd | Construction | 2026 |
| Figures First Accounting Solutions Ltd | Professional & scientific | 2026 |
| FIL Auto Body Service Limited | Wholesale & retail | 2024 |
| Filliano Court 2014 Limited | Households | 2014 |
| Fillmark Ltd | Professional & scientific | 2025 |
| Filofax Distributors Ltd | Wholesale & retail | 2018 |
| Filoo Ltd | Manufacturing | 2026 |
| Filter Trike Limited | Transport & logistics | 2025 |
| FIN and Fork Limited | Wholesale & retail | 2025 |
| Finah Consultancy Ltd | Financial services | 2024 |
| Finalbuy Limited | Wholesale & retail | 2025 |
| Finance Approved Ltd | Professional & scientific | 2017 |
| Finance Economy Solution (Global) Limited | Financial services | 2022 |
| Finch Close Management Company Limited | Households | 2024 |
| Find the Shark Limited | Professional & scientific | 2022 |
| Findmysia Ltd | Information & communication | 2026 |
| Findmytrader Ltd | Information & communication | 2026 |
| Findono Trading Limited | Real estate | 2021 |
| Findsfresh Ltd | Wholesale & retail | 2025 |
| Fine Food Catering Limited | Hospitality | 2009 |
| Fine Shining Services Limited | Administrative & support | 2025 |
| Finesse Forde Physio Limited | Health & social care | 2014 |
| Finesse Property Solutions Ltd | Households | 2021 |
| Finesse Stays Short Lets Ltd | Real estate | 2024 |
| Finest Building & Construction Limited | Construction | 2016 |
| Finexis Accountants Ltd | Professional & scientific | 2024 |
| Finorminal Ltd | Other services | 2013 |
| Finsbury Medical Services Limited | Health & social care | 2026 |
| Finstra Group Limited | Administrative & support | 2025 |
| Finstrive Ltd | Professional & scientific | 2024 |
| Fintech Valley Ltd | Financial services | 2018 |
| Fintek International Ltd | Professional & scientific | 2020 |
| Finway Motors Ltd | Wholesale & retail | 2023 |
| Finway Van Sales Ltd | Wholesale & retail | 2024 |
| FIO Grai & Co Ltd | Manufacturing | 2022 |
| Fiqq Investments Ltd | Real estate | 2024 |
| Firbeson Automation UK Ltd | Manufacturing | 2025 |
| Firdous Designerwear and Textiles Ltd | Wholesale & retail | 2025 |
| Fire Safety Works Limited | Construction | 2017 |
| Fire Sprinklers Ltd | Other services | 2022 |
| Fire Training Bucks & MK Ltd | Administrative & support | 2014 |
| Fireandmagic Ltd | Manufacturing | 2025 |
| Fireaway Luton Limited | Hospitality | 2024 |
| Firebird Conference Systems Ltd | Information & communication | 2016 |
| Fireblitz Extinguisher Limited | Wholesale & retail | 2008 |
| Fireflies Management Ltd | Professional & scientific | 2023 |
| Firehood Limited | Construction | 2023 |
| Firesafe (Fire Safety Management) Consultants Limited | Other services | 2014 |
| Firestar Electronics Limited | Wholesale & retail | 2025 |
| Firm Energy Ltd | Other services | 2023 |
| Firm Global Construction Ltd | Construction | 2024 |
| Firm Impact Services Ltd | Administrative & support | 2022 |
| First Call Childcare Ltd | Administrative & support | 2023 |