| Ferre Carpentry Limited | Professional & scientific | 2007 |
| Ferros III Limited | Transport & logistics | 2023 |
| FFB Brickwork Ltd | Construction | 2026 |
| FGB Building Services Ltd | Construction | 2007 |
| Fglcp Limited | Real estate | 2013 |
| FGN Services Ltd | Construction | 2016 |
| Fiand Limited | Professional & scientific | 2022 |
| Fidelis Compliance Ltd | Professional & scientific | 2024 |
| Field and Forest Land Management Limited | Agriculture & fishing | 2019 |
| Field View Storage Ltd | Administrative & support | 2024 |
| Fields Apparel Ltd | Wholesale & retail | 2022 |
| Figg House Interiors Ltd | Wholesale & retail | 2024 |
| Figure Eight Creative Limited | Professional & scientific | 2026 |
| Figuregrade Group Limited | Financial services | 2015 |
| Figuregrade Limited | Wholesale & retail | 1994 |
| Fika Lettings Limited | Real estate | 2017 |
| Fika Properties Limited | Real estate | 2020 |
| Filip-Olz Ltd | Construction | 2018 |
| Film Artwork Online Ltd | Professional & scientific | 2006 |
| Filmmojo Ltd | Information & communication | 2024 |
| FIN Skate Ltd | Wholesale & retail | 2024 |
| Final CAD Solutions Ltd | Information & communication | 2015 |
| Financial Beneficial Agenda Ltd | Professional & scientific | 2023 |
| Financial Capital Investment Services Limited | Administrative & support | 2021 |
| Finchwood Homes Ltd | Construction | 2024 |
| Finchwood Lettings Limited | Real estate | 2026 |
| Fine Dining (Sussex) Limited | Hospitality | 2009 |
| Fine Drinks Co. Ltd | Professional & scientific | 2021 |
| Fine Line Decorating Specialists Ltd | Construction | 2025 |
| Finest Finishes Limited | Construction | 2019 |
| Finial Roofing Limited | Construction | 2023 |
| Fiona Allison Ltd | Professional & scientific | 2016 |
| Fire Door Maintenance Group Limited | Manufacturing | 2022 |
| Fire Systems Direct Ltd | Administrative & support | 2011 |
| Firecrest IT Limited | Information & communication | 2009 |
| Firefly Energy Ltd | Construction | 2021 |
| Firestop Contracting Limited | Construction | 2019 |
| Firetrack Ltd | Other services | 2015 |
| Firlands Consulting Ltd | Professional & scientific | 2021 |
| First Design Consultancy Ltd | Information & communication | 2013 |
| First Group (Kingley) Ltd | Construction | 2025 |
| First Option Private Ltd | Administrative & support | 2025 |
| First Step 2 Care Ltd | Administrative & support | 2019 |
| First Triathlon Ltd | Arts & recreation | 2020 |
| Fischer Connectors Limited | Wholesale & retail | 1988 |
| Fishingmatchgame Ltd | Manufacturing | 2008 |
| Fitn App Ltd | Information & communication | 2024 |
| Fitnash Limited | Health & social care | 2016 |
| Fitness Space (Ascot) Ltd | Arts & recreation | 2010 |
| Fitness Space (Franchise) Ltd | Arts & recreation | 2014 |
| Fitness Space (Holdings) Ltd | Financial services | 2010 |
| Fitspace Media Ltd | Information & communication | 2022 |
| Fitzhamon Management Company Limited | Households | 2004 |
| Fivefold Group Limited | Real estate | 2025 |
| FIX IT Handyman Services Limited | Construction | 2009 |
| Fizzy GAS Company Limited | Health & social care | 2013 |
| FJ Rail and Construction Ltd | Construction | 2024 |
| FJS Construction Ltd | Construction | 2018 |
| Flanagan Legal Limited | Professional & scientific | 2020 |
| Flard Ltd | Real estate | 2015 |
| Flash Payroll Ltd | Financial services | 2020 |
| Flash Rail Limited | Transport & logistics | 2017 |
| Flat 2-27 GP LLP | | 2011 |
| Flathouse Electrical Services Ltd | Construction | 2023 |
| Flatpack Flowers Ltd | Extraterritorial | 2014 |
| Flawless Valeting & Detailing Limited | Administrative & support | 2026 |
| FLD Builders Limited | Construction | 2013 |
| Fleet Audits Limited | Professional & scientific | 1983 |
| Fleet Forensics Limited | Information & communication | 2008 |
| Fleet Uk.Com Ltd | Wholesale & retail | 2000 |
| Fletcher Freeman Associates Limited | Extraterritorial | 2017 |
| Flexible Space Solutions Ltd | Construction | 2025 |
| Flexx Services Ltd | Transport & logistics | 2023 |
| Flightbag Ltd | Wholesale & retail | 2025 |
| Flintstone Builders Limited | Construction | 2004 |
| Floatopia Retreat Limited | Financial services | 2020 |
| Flood Risk Mitigation Limited | Professional & scientific | 2010 |
| Flood Tide Limited | Financial services | 2019 |
| Florence Hotels Ltd | Hospitality | 2025 |
| Flourish Day Nursery Ltd | Education | 2021 |
| Flourish Day Nursery Recruitment Ltd | Administrative & support | 2023 |
| Flourish Solutions Consulting Services Limited | Education | 2026 |
| Flow Wave Tech Limited | Information & communication | 2023 |
| Flowseal Limited | Wholesale & retail | 1974 |
| Flux Growth Limited | Administrative & support | 2025 |
| FLY Creative Design Limited | Wholesale & retail | 2011 |
| Flyfish Direct Limited | Wholesale & retail | 2003 |
| Fm:Csi Limited | Professional & scientific | 2014 |
| Fmfm Limited | Financial services | 2002 |
| FMP Solutions Ltd | Other services | 2024 |
| Focus Strategy Consultancy Ltd | Information & communication | 2023 |
| Foley Property Investments Limited | Real estate | 2016 |
| Folium Studio Limited | Information & communication | 2026 |
| Folly Models Limited | Wholesale & retail | 2005 |
| Fontwell Healthcare Ltd. | Health & social care | 2017 |
| Fontwell Physio Ltd. | Health & social care | 2006 |
| Food Conformity Limited | Hospitality | 2024 |
| Footedge Marketing Ltd | Information & communication | 2024 |
| Forcomm Consultancy Limited | Information & communication | 2021 |
| Forestwood Joinery & Building Conservation Ltd | Manufacturing | 2020 |