| Fiarana Limited | Real estate | 2020 |
| Fiber Consulting Ltd | Administrative & support | 2015 |
| Fidem Estates Ltd | Real estate | 2023 |
| Fidem Ltd | Real estate | 2023 |
| Fidesign Ltd | Construction | 2020 |
| Fidget Calm Creations Ltd | Wholesale & retail | 2025 |
| Fifty East Ltd | Real estate | 2024 |
| FIL09 Limited | Construction | 2010 |
| Filakia Limited | Financial services | 2024 |
| Finance Base Ltd | Professional & scientific | 2018 |
| Finance Staffing Solutions Limited | Administrative & support | 2009 |
| Financial & Investment Developments Limited | Construction | 2022 |
| Find Building Solutions Ltd | Construction | 2024 |
| Findern Ltd | Administrative & support | 2026 |
| Finemans Limited | Real estate | 1998 |
| Finesash Ltd | Manufacturing | 2023 |
| Firaasah Limited | Real estate | 2024 |
| Firmans Court Management Co Limited | Households | 2021 |
| Firsby Limited | Administrative & support | 2016 |
| Firsby Property Ltd | Real estate | 2026 |
| First Rooms Ltd | Real estate | 2019 |
| Fit Learning Limited | Administrative & support | 2019 |
| Fit OUT and Refurbishment Management Ltd | Construction | 2003 |
| Fit Stunners Ltd | Arts & recreation | 2024 |
| FIT2SKATE Ltd | Education | 2021 |
| Five Flames Ltd | Hospitality | 2026 |
| Five Horizons Limited | Information & communication | 2022 |
| Five Tech Limited | Wholesale & retail | 2010 |
| FIVE5 Entertainment Holding Limited | Financial services | 2025 |
| Fivefold Properties Ltd | Real estate | 2025 |
| FIX N Finish Ltd | Construction | 2025 |
| Fizz Junior Limited | Administrative & support | 2014 |
| FJI Herts Limited | Health & social care | 2011 |
| FK FFF Coaching LLP | | 2026 |
| Flagship Products Ltd | Wholesale & retail | 2025 |
| FLAMES4458 Ltd | Hospitality | 2022 |
| Flamora Import Export Ltd | Wholesale & retail | 2025 |
| Fledge Events Ltd | Hospitality | 2023 |
| Fleet Process Holding Limited | Financial services | 2025 |
| Flexview Limited | Construction | 2013 |
| Floenergy Ltd | Administrative & support | 2021 |
| Floergy Ltd | Energy | 2025 |
| Floor Plan Developments Ltd | Construction | 2012 |
| Florem Ltd | Wholesale & retail | 2025 |
| Florence & Ella Ltd | Wholesale & retail | 2022 |
| Florico Limited | Wholesale & retail | 2025 |
| Flow Life Limited | Arts & recreation | 2018 |
| Flowcode Group Limited | Administrative & support | 2025 |
| Flowers by Tanya Mckenna Ltd | Wholesale & retail | 2016 |
| Floyds of Sidcup Limited | Wholesale & retail | 2008 |
| Flozybaby Ltd | Health & social care | 2015 |
| Flying Bean Cafe Express Limited | Administrative & support | 2021 |
| Flying Bean Cafe Limited | Hospitality | 2014 |
| Flyingbinary Limited | Information & communication | 2010 |
| FM Lighting Ltd | Construction | 2021 |
| FMI Drylining Ltd | Construction | 2019 |
| Focus Security Systems Limited | Wholesale & retail | 1996 |
| Focusing on Youth Limited | Health & social care | 2018 |
| Foley Baldwin Estates Limited | Real estate | 2024 |
| Foley Limited | Construction | 1990 |
| Foley Properties Limited | Professional & scientific | 1994 |
| Folk in Motion C.I.C. | Arts & recreation | 2013 |
| Follicle Fuel Ltd | Wholesale & retail | 2025 |
| Food Geeks Limited | Administrative & support | 2025 |
| Food Safety & Quality Solutions Ltd | Professional & scientific | 2018 |
| Food Services World Wide Limited | Wholesale & retail | 2008 |
| Foodball Lounge Ltd | Hospitality | 2025 |
| Ford Rhodes Holdings Ltd | Real estate | 2020 |
| Ford Rhodes Limited | Real estate | 2018 |
| Fore Street Investments Limited | Real estate | 2014 |
| Forest Court Freeholders Limited | Households | 1999 |
| Forest Edge Limited | Professional & scientific | 2009 |
| Forever Q Limited | Information & communication | 2021 |
| Forever Spring Ltd | Real estate | 2022 |
| Forma London Construction Services Limited | Construction | 2014 |
| Forma London Holdings Limited | Financial services | 2023 |
| Formbase Furniture Ltd | Wholesale & retail | 2006 |
| Forson Properties Ltd | Real estate | 2024 |
| Fort Equity Capital Ltd | Financial services | 2026 |
| Fortune Link Enterprises Limited | Administrative & support | 1997 |
| Forward Focus (London) Limited | Professional & scientific | 2018 |
| Foula Prestige Limited | Wholesale & retail | 2010 |
| Foundation Football Limited | Administrative & support | 2008 |
| Foundation Group C.I.C. | Administrative & support | 2015 |
| Foundation Nurseries (Farnham Green) Limited | Administrative & support | 2022 |
| Foundation Nurseries (Rise Park) Limited | Administrative & support | 2022 |
| Foundation Nurseries Limited | Administrative & support | 2012 |
| Foundation Play Limited | Administrative & support | 2021 |
| Foundation Sports Limited | Arts & recreation | 2000 |
| Foundry Four Limited | Real estate | 2019 |
| Foundry One Limited | Real estate | 2018 |
| Foundry Two Limited | Real estate | 2018 |
| Fountaine Bleau Ltd | Real estate | 2015 |
| Four Red Hats Limited | Information & communication | 2014 |
| Four Two Consulting Ltd | Information & communication | 2021 |
| Fourth Quarter Ltd | Other services | 2025 |
| Fowler Tiling Ltd | Construction | 2007 |
| Foxbase Limited | Real estate | 2008 |
| Foxstone Estates (London) Ltd | Real estate | 2023 |
| Foxstone Estates Limited | Construction | 1992 |