| Fordtography Ltd | Professional & scientific | 2022 |
| Forearth Limited | Water & waste | 2023 |
| Forecast Solutions Planning Limited | Professional & scientific | 2011 |
| Forest Design Ltd | Information & communication | 2011 |
| Forever Devine Ltd | Manufacturing | 2019 |
| Forge Close Management Limited | Households | 1993 |
| Formation Comms Limited | Professional & scientific | 2025 |
| Forrest Block Management Limited | Real estate | 2022 |
| Forrest Signalling Services Ltd | Professional & scientific | 2011 |
| FORSURE1 Ltd | Real estate | 2022 |
| Forth Race Limited | Arts & recreation | 2025 |
| Fortitudine Vincit Ltd | Other services | 2026 |
| Fortius Consultancy Limited | Professional & scientific | 2024 |
| Fortunatus Ltd | Information & communication | 2013 |
| Fortune PVT Ltd | Hospitality | 2024 |
| Forward Forklifters Limited | Manufacturing | 1979 |
| Fossil Well Management Ltd | Information & communication | 2017 |
| Foster Kemp Asset Management Ltd | Real estate | 2009 |
| Foster Kemp Company Services Ltd | Professional & scientific | 2024 |
| Foster Kemp Property Management Limited | Real estate | 1989 |
| Fosters Dental Ceramics Limited | Manufacturing | 2010 |
| Fotopixel Photography Limited | Professional & scientific | 2024 |
| Fouji's Tuition Limited | Education | 2024 |
| Four Bees Services Limited | Professional & scientific | 2025 |
| Four Dimensional Ltd | Information & communication | 2014 |
| Four Pillars Property Management Ltd | Real estate | 2025 |
| Four Seasons Window Cleaning Ltd | Administrative & support | 2025 |
| Four ZED Limited | Health & social care | 2022 |
| FOX Companies Limited | Construction | 2018 |
| Foxten Autos Limited | Wholesale & retail | 1993 |
| Foxwylie Limited | Other services | 2016 |
| Foxxy Tweed Limited | Extraterritorial | 2016 |
| FP Financial Management Ltd | Professional & scientific | 2024 |
| FR Accountants Limited | Professional & scientific | 2015 |
| Frame Glazing Ltd | Construction | 2026 |
| Framework Digital Ltd | Information & communication | 2014 |
| Fran Property Management Ltd | Real estate | 2026 |
| Fran's Property Solutions Ltd | Real estate | 2021 |
| Franc & JO Technologies Ltd | Information & communication | 2020 |
| Franglen Lupino Music Limited | Information & communication | 1988 |
| Frank Christie Services Limited | Manufacturing | 2017 |
| Freca Enterprises Limited | Transport & logistics | 2019 |
| Fred Hodges Training Ltd | Other services | 2008 |
| Fred's AV & Electrical Solutions Limited | Construction | 2024 |
| Fredericks RMN Services Limited | Health & social care | 2021 |
| Free Tides Ltd | Wholesale & retail | 2021 |
| Freedom Warranties Ltd | Wholesale & retail | 2021 |
| Freedom Warranty Ltd | Wholesale & retail | 2022 |
| Freeland 121 Limited | Administrative & support | 2015 |
| Freeman Building and Roofing Services Ltd | Construction | 2014 |
| Freesound Productions Ltd | Arts & recreation | 2026 |
| Freestyle Hair Salon Ltd | Other services | 2020 |
| Fremaux Delorme Company Limited | Wholesale & retail | 1989 |
| Fresh and Free Gardens Ltd | Administrative & support | 2009 |
| Fresh Carpet Team Deep Cleaning Solutions Ltd | Administrative & support | 2025 |
| Fresh From Desh Ltd | Wholesale & retail | 2019 |
| Fresh Lens Consulting Ltd. | Information & communication | 2017 |
| Freysia Ltd | Wholesale & retail | 2026 |
| Friars Aylesbury Ltd | Arts & recreation | 2015 |
| Friary Court Freehold Limited | Real estate | 2019 |
| Friday AI Advisory Limited | Information & communication | 2026 |
| Friendly Helpers Ltd | Other services | 2024 |
| Friends and Flavours Ltd | Hospitality | 2021 |
| Friends of Kampala Music School | Education | 2008 |
| Friends PAW Nights Ltd | Administrative & support | 2026 |
| Friends' House Moscow | Extraterritorial | 1996 |
| Frobisher Court Limited | Households | 2011 |
| Frog Lane Limited | Information & communication | 2025 |
| Froggy Records Limited | Manufacturing | 2016 |
| Frontier Premises Limited | Real estate | 2018 |
| Frontline Health Ltd | Wholesale & retail | 2020 |
| Frostechnic Limited | Construction | 1993 |
| Fruity Imports Ltd | Wholesale & retail | 2024 |
| Fruity Land Ltd | Wholesale & retail | 2026 |
| FTA IP Ltd | Information & communication | 2025 |
| Ftacademy Ltd | Arts & recreation | 2020 |
| FTD75 Limited | Wholesale & retail | 2026 |
| FTY Carpentry Limited | Construction | 2024 |
| Fuddle Ltd | Wholesale & retail | 2023 |
| Fufe Ltd | Construction | 2023 |
| Full Stack Tech Ltd | Information & communication | 2015 |
| Fullcourt Padel Ltd | Wholesale & retail | 2025 |
| Fuller Surfacing Limited | Construction | 2020 |
| Fulwards Limited | Financial services | 2021 |
| Funnex Health Care Services Ltd | Health & social care | 2012 |
| Furniture by Design Ltd | Construction | 2018 |
| Furylab Limited | Information & communication | 2014 |
| Fusion Business Supplies Limited | Wholesale & retail | 2020 |
| Fusion Cars STM Ltd | Wholesale & retail | 2019 |
| Fusion Fabrications (UK) Ltd | Manufacturing | 2012 |
| Fusion Films & TV Limited | Other services | 2002 |
| Future Focus Business Coaching and Development Ltd | Professional & scientific | 2016 |
| Future Houses and Energy Solutions Ltd | Energy | 2025 |
| Future Learning Systems Limited | Information & communication | 1995 |
| Future Path Mentoring Ltd | Education | 2024 |
| Future Sparks Ltd | Construction | 2016 |
| Futurehand Limited | Professional & scientific | 2005 |
| Futurepulse Ventures Ltd | Professional & scientific | 2024 |
| Fuze Europe (UK) Limited | Administrative & support | 2014 |
| Fuze Technologies Limited | Wholesale & retail | 2014 |