| Flexgc Limited | Professional & scientific | 2014 |
| Flexypix Limited | Manufacturing | 2016 |
| Flintailab Ltd | Information & communication | 2026 |
| Floheat Services Ltd | Construction | 2008 |
| Flomor Ltd | Professional & scientific | 2017 |
| Floordrobe Ltd | Wholesale & retail | 2024 |
| Flora Games Ltd | Information & communication | 2023 |
| Floreo RMC Ltd | Wholesale & retail | 2024 |
| Flour and Family Ltd | Wholesale & retail | 2024 |
| Flourish and Farm Ltd | Real estate | 2025 |
| Flower Power Remedy Ltd | Wholesale & retail | 2025 |
| Flowweb AI Limited | Information & communication | 2025 |
| Fluent Supply Limited | Wholesale & retail | 2026 |
| Flutex Industrial Ltd | Wholesale & retail | 2026 |
| Fluvette Ltd | Information & communication | 2025 |
| Fluvialycs Ltd | Information & communication | 2024 |
| Flux Leather Supply Limited | Wholesale & retail | 2026 |
| Flyhorizon Limited | Wholesale & retail | 2025 |
| Flyphobia Media Ltd | Education | 2024 |
| Flypro Developments Ltd | Construction | 2025 |
| FMA Autos Ltd | Wholesale & retail | 2022 |
| FMG Finance Consulting Limited | Professional & scientific | 2015 |
| Foan Ltd | Information & communication | 2026 |
| Foci Properties Ltd | Real estate | 2025 |
| Folio English Language Services Ltd | Education | 2023 |
| Fominant Ltd | Wholesale & retail | 2024 |
| Fonepay Limited | Information & communication | 2006 |
| Food Challenge Hub Ltd | Information & communication | 2026 |
| Food Kiosk Ltd | Hospitality | 2025 |
| Foomville Homes Ltd | Real estate | 2023 |
| Football IS for the Fans Community CIC | Other services | 2025 |
| Football IS for the Fans Ltd | Arts & recreation | 2025 |
| Footcozy Ltd | Wholesale & retail | 2023 |
| FOR the Good of Care Ltd | Financial services | 2021 |
| Forawell Ltd | Wholesale & retail | 2025 |
| Foresight Common Ltd | Real estate | 2024 |
| Foresight Consultants Ltd | Financial services | 2019 |
| Foresight Property Group Ltd | Real estate | 2020 |
| Forest Heath Electrical Wholesale Limited | Wholesale & retail | 2000 |
| Foresyt Property Solutions Ltd | Administrative & support | 2024 |
| Forever Emphatic Limited | Wholesale & retail | 2026 |
| Forever Performance Limited | Arts & recreation | 2025 |
| Forevibe Ltd | Information & communication | 2026 |
| Forge Clarity Limited | Professional & scientific | 2026 |
| Forge Strength and Conditioning Limited | Arts & recreation | 2018 |
| Forgesynapse Ltd | Information & communication | 2025 |
| Forgify Ltd | Information & communication | 2023 |
| Forgold Limited | Real estate | 1989 |
| Forma Labs Ltd | Information & communication | 2026 |
| Formativetv Limited | Arts & recreation | 2019 |
| Formuly Ltd | Professional & scientific | 2025 |
| Forseti Employment Law Solutions Ltd | Professional & scientific | 2025 |
| Forseven Financial Services (Europe) Ltd | Financial services | 2024 |
| Forseven Financial Services (UK) Limited | Financial services | 2024 |
| Fortis Mechanical Ltd | Construction | 2025 |
| Fortress Freedom Phone Ltd | Wholesale & retail | 2026 |
| Fortress Fungi Ltd | Agriculture & fishing | 2024 |
| Fortress Worldwide Ltd | Information & communication | 2021 |
| Fortuneforge Ltd | Information & communication | 2026 |
| Forward Qualifications Ltd | Education | 2026 |
| Forward Think Collective Ltd | Wholesale & retail | 2026 |
| Forward Thinking Cambridge Ltd | Real estate | 2024 |
| Founders Launchhub Ltd | Professional & scientific | 2023 |
| Four Integers Ltd | Information & communication | 2024 |
| Four Lights Ltd | Information & communication | 2019 |
| Four Seasons Decorating Ltd | Construction | 2024 |
| Fouracres Property Group Ltd | Real estate | 2024 |
| Fourseasons Housing Solutions LLP | | 2025 |
| Fowler Optical Testing LLP | | 2023 |
| FOX Cove Publishing Limited | Information & communication | 2026 |
| FOX FIX Property Maintenance Ltd | Extraterritorial | 2024 |
| FOX Land Ltd | Construction | 2023 |
| FOX Worx Ltd | Wholesale & retail | 2023 |
| Foxcote Events Ltd | Hospitality | 2025 |
| FRACTAL8 Ltd | Information & communication | 2025 |
| Fractional Tech Ltd | Information & communication | 2023 |
| Framing Solutions Ltd | Wholesale & retail | 2026 |
| Francesmead Ltd | Extraterritorial | 2017 |
| Frandustry Limited | Information & communication | 2025 |
| Fraser Family Capital Ltd | Real estate | 2025 |
| Frata Ltd | Information & communication | 2025 |
| Free Invest Dubai Ltd | Information & communication | 2025 |
| Freedom Applications Ltd | Information & communication | 2025 |
| Freedom IS Capital Ltd | Information & communication | 2026 |
| Freewillhealth LLP | | 2025 |
| Freeze Media Ltd | Professional & scientific | 2007 |
| Freightspace Ltd | Transport & logistics | 2018 |
| Fresco Group Ltd | Manufacturing | 2025 |
| Fresh Ideabox Ltd | Information & communication | 2013 |
| Fresh Look Media Limited | Information & communication | 2001 |
| Freshsetuk Ltd | Wholesale & retail | 2025 |
| Fretum Brene Limited | Professional & scientific | 2010 |
| Friars Technologies Limited | Information & communication | 2026 |
| Friday Sports Club Limited | Wholesale & retail | 2026 |
| Friends & Family Pet Food Limited | Manufacturing | 2024 |
| Friends of Poynton Pool Ltd | Professional & scientific | 2024 |
| Fringeit Ltd | Information & communication | 2010 |
| Frithgarth Properties Ltd | Real estate | 1977 |
| Froffey Coffee Ltd | Hospitality | 2022 |
| Frog House Limited | Real estate | 2022 |