| Fairgreen Property Holdings Limited | Real estate | 2003 |
| Fairway Legends Ltd | Wholesale & retail | 2024 |
| Fairway Seals Limited | Wholesale & retail | 1977 |
| Falcons AFC Trading Limited | Arts & recreation | 2017 |
| Falcons Holdings Limited | Arts & recreation | 2017 |
| Family Consulting Ltd | Professional & scientific | 2018 |
| Fannie Fleur Ltd | Wholesale & retail | 2025 |
| Fanshots Limited | Professional & scientific | 2022 |
| Farm Club Limited | Education | 2011 |
| Farndon Fields (Farndon Road) Management Company Limited | Households | 2011 |
| Farndon Fields (P2) Management Company Ltd | Households | 2013 |
| Farndon Fields Farm Shop Ltd | Wholesale & retail | 1963 |
| Farndon Fields Farming Limited | Agriculture & fishing | 2019 |
| Farndon Fields Property Limited | Real estate | 2012 |
| Farndon Foods Holdings Limited | Financial services | 2025 |
| Farndon Foods Limited | Administrative & support | 2007 |
| Fashoma Ltd | Information & communication | 2026 |
| Fast Movement Ltd | Transport & logistics | 2023 |
| FAT Press Ltd | Manufacturing | 2016 |
| Fawn Hold Co (Two) Limited | Financial services | 2021 |
| FB 2 Limited | Professional & scientific | 2020 |
| FD Goodall Ltd | Administrative & support | 2022 |
| Fellbase Limited | Wholesale & retail | 2010 |
| Femke 47 Ltd | Hospitality | 2026 |
| Fenceanddeck Limited | Wholesale & retail | 1999 |
| Fenton&Blume Ltd | Professional & scientific | 2022 |
| Ferguson Broadbent Developments LLP | | 2010 |
| Fernandes Smith Enterprises Limited | Financial services | 2025 |
| Fernie Hall Ltd | Hospitality | 2023 |
| Fetch and Walk LLP | | 2017 |
| FG Market Ltd | Hospitality | 2023 |
| Fiagh Ltd | Professional & scientific | 2026 |
| Fiducia Developments Ltd | Construction | 2020 |
| Fieco Accountancy & Marketing Ltd | Information & communication | 2020 |
| Fieco Web Design & Marketing Ltd | Information & communication | 2022 |
| Field Farm Flowers Limited | Wholesale & retail | 2024 |
| Field Grain Limited | Wholesale & retail | 2014 |
| Fiesta Sports Coaching Ltd | Education | 2018 |
| Figure of Speech and Language Ltd | Health & social care | 2024 |
| Final Shot Ltd | Information & communication | 2020 |
| Finance Director on Demand Limited | Administrative & support | 2020 |
| Finch 24 Limited | Arts & recreation | 2014 |
| Fineseason Limited | Agriculture & fishing | 1978 |
| Fingertips Media Ltd | Professional & scientific | 2015 |
| First Family Law Ltd | Professional & scientific | 2021 |
| FIS Industrial Services Limited | Professional & scientific | 2012 |
| Fisheye Mirrors Ltd | Manufacturing | 2015 |
| Fit to PIN Ltd | Other services | 2023 |
| FIT4PERFORMANCE Ltd | Health & social care | 2020 |
| Fitness 50+ Market Harborough Limited | Arts & recreation | 2026 |
| Fitwell Furniture Limited | Wholesale & retail | 2026 |
| Fiya Limited | Extraterritorial | 2018 |
| Fizzydo Limited | Extraterritorial | 2021 |
| FK ARB Services Ltd | Administrative & support | 2024 |
| Flatstick Talent Ltd | Professional & scientific | 2021 |
| Fleckers' Coach Trips Ltd | Administrative & support | 2022 |
| Fleet-Eye Limited | Manufacturing | 2016 |
| Flexi Utilities Ltd | Wholesale & retail | 2020 |
| Flexible Retirement Limited | Extraterritorial | 2008 |
| Flexor Solutions Limited | Real estate | 2019 |
| Flinders Technology Limited | Manufacturing | 2015 |
| Flint Electrical Limited | Construction | 2010 |
| Florence and James Marketing Ltd | Professional & scientific | 2023 |
| Florence Avenue Limited | Construction | 2021 |
| Floristart Ltd | Arts & recreation | 2025 |
| Flourish Support Services Ltd | Health & social care | 2024 |
| Flower House Retreats Limited | Real estate | 2024 |
| Fluid Intelligence Ltd | Professional & scientific | 2022 |
| Flyinghippocrocoduck Ltd | Information & communication | 2026 |
| FMA PUB Ltd | Hospitality | 2023 |
| Focal Accountancy Limited | Professional & scientific | 1999 |
| Focal Advisory Limited | Professional & scientific | 2015 |
| Focal Business Group Limited | Professional & scientific | 2015 |
| Focal Financial Limited | Professional & scientific | 2015 |
| Focal IT Limited | Information & communication | 2015 |
| Focal Marketing Limited | Professional & scientific | 2015 |
| Focal People Limited | Professional & scientific | 2019 |
| Food Safe Sales Limited | Other services | 2006 |
| Food Safety and Integrity Group Limited | Professional & scientific | 2014 |
| Food Thinking Ltd. | Professional & scientific | 2014 |
| Footy Away Days Ltd | Administrative & support | 2024 |
| Force Four Creative Limited | Administrative & support | 2013 |
| Fordham's Automation Safety Limited | Administrative & support | 2021 |
| Forefront Audio Visual Limited | Information & communication | 2021 |
| Forever Finance Group Limited | Financial services | 2025 |
| Fortitude Capital Holdings Ltd | Financial services | 2025 |
| Fortnum Home Improvements Ltd | Extraterritorial | 2013 |
| Fortnums Tile Studio Ltd | Extraterritorial | 2013 |
| Fortress TEN Limited | Real estate | 2023 |
| Fortress Twelve Limited | Real estate | 2023 |
| Forty Acre Holdings Ltd | Real estate | 2025 |
| Forward Property Developments Limited | Construction | 1984 |
| Fosters Commercial Properties Limited | Real estate | 2016 |
| Foundry Cores & Moulds Limited | Manufacturing | 2009 |
| Four Words APS Ltd | Information & communication | 2024 |
| Fourseasons Business Consultants Limited | Professional & scientific | 2010 |
| Fourteenth Day Ltd | Information & communication | 2021 |
| Fourth Bridge Investments Limited | Financial services | 2025 |
| FOX & Bear Properties Ltd | Real estate | 2020 |
| FOX & Toon Ltd | Real estate | 2014 |