| Ferntree Consulting Limited | Professional & scientific | 2020 |
| Ferrari Demolition Limited | Construction | 2002 |
| Festival for YOU Ltd | Arts & recreation | 2021 |
| Fieldwear & Fineries Limited | Wholesale & retail | 2025 |
| Fifties People Limited | Administrative & support | 2015 |
| FIG Cinematics Limited | Information & communication | 2011 |
| FIH Group PLC | Professional & scientific | 1997 |
| Fina Services Limited | Administrative & support | 1987 |
| Final Boss Pictures Limited | Information & communication | 2019 |
| Finassyst Ltd | Professional & scientific | 2024 |
| Finch Theory Limited | Extraterritorial | 2026 |
| Finding Capital Ltd | Financial services | 2026 |
| Findon Road Properties Limited | Real estate | 1960 |
| Finefloors Restoration Limited | Construction | 2012 |
| Finest Fraction Limited | Manufacturing | 2022 |
| Fintech Alliance Limited | Information & communication | 2019 |
| Fintech Alliance UK Ltd | Information & communication | 2019 |
| Fintechserve Limited | Administrative & support | 2024 |
| Fire and Security Solutions Group Ltd | Other services | 2022 |
| First Choice Properties (London) Limited | Real estate | 2020 |
| First Class Education Recruitment Services Limited | Administrative & support | 2014 |
| First Harbinger Residents Association (Hampstead) Limited | Households | 1984 |
| Fishers Green Sailing Club CIC | Arts & recreation | 2013 |
| Fisita (UK) Limited | Professional & scientific | 1998 |
| Fit LAB Ltd | Other services | 2025 |
| FIT2FITE Limited | Arts & recreation | 2007 |
| Fixman Ltd | Construction | 2019 |
| Flacks Mews (Epping) Management Company Limited | Administrative & support | 2009 |
| Flair Montage Limited | Financial services | 2024 |
| Flare Lighting Limited | Arts & recreation | 2008 |
| Flat Roof Specialists Ltd | Construction | 2024 |
| Flawless AV Ltd | Professional & scientific | 2024 |
| Flawless Wraps Limited | Wholesale & retail | 2025 |
| Fleetwood Services Limited | Other services | 2021 |
| Flex Architects Limited | Professional & scientific | 2022 |
| Flex Electrical Solutions Ltd | Construction | 2025 |
| Flexi Group Limited | Manufacturing | 2015 |
| Flexpricer Limited | Administrative & support | 2020 |
| Flitch Estate Management Co. Limited | Real estate | 1996 |
| FLO Interiors Ltd | Construction | 2022 |
| Flo-Tex Flooring Solutions Limited | Construction | 2023 |
| Flobelle Consultancy Limited | Professional & scientific | 2011 |
| Flooring Brothers and Maintenance Ltd | Administrative & support | 2018 |
| Flow Stet Ltd | Professional & scientific | 2024 |
| Flow Water Hygiene Services Ltd | Water & waste | 2024 |
| Fluegas Limited | Construction | 2016 |
| Flutter-Bye Ltd | Wholesale & retail | 2025 |
| FLY My Cloud Limited | Information & communication | 2015 |
| Flyer Group Media Ltd. | Professional & scientific | 2006 |
| FM Pearce Holdings Limited | Financial services | 2025 |
| FMR Casting Ltd | Professional & scientific | 2026 |
| Foamology Limited | Manufacturing | 2018 |
| Focusguard Limited | Professional & scientific | 2002 |
| Fohlin I/O Ltd. | Information & communication | 2017 |
| Foll&Co Ltd | Information & communication | 2016 |
| Footballbugs Limited | Education | 2022 |
| Foote Stones Ltd. | Construction | 2013 |
| Fordham Heating Services Ltd | Construction | 2016 |
| Foreland Asset Management Limited | Real estate | 2020 |
| Forest Gate Takeley Limited | Households | 2023 |
| Foresters Family Estate Ltd | Agriculture & fishing | 2016 |
| Forever Infernal Ltd | Other services | 2023 |
| Forever Jewellery by Charlotte Ltd | Manufacturing | 2024 |
| Forrest ICT Consulting Limited | Professional & scientific | 2025 |
| Forty Hill Investments Limited | Financial services | 2023 |
| Forward Corporate Finance Limited | Financial services | 2017 |
| Forwardspread Limited | Construction | 1986 |
| Forwood Energy Limited | Professional & scientific | 2013 |
| Foster Site Supplies Ltd | Administrative & support | 2017 |
| Four Countries Communications Limited | Professional & scientific | 2006 |
| Four Monkeys Capital Ltd | Professional & scientific | 2017 |
| Fowowe Investment Limited | Real estate | 2023 |
| FOX Communications Limited | Professional & scientific | 2007 |
| FOX Delivery Ltd | Transport & logistics | 2016 |
| Foxley Joinery Ltd | Construction | 2003 |
| FPC Property Limited | Real estate | 2023 |
| FR3SH Media Limited | Information & communication | 2024 |
| Fractionaut Ltd | Professional & scientific | 2024 |
| Francis LEE Estates Limited | Real estate | 1979 |
| Franks Bagels Ltd | Hospitality | 2022 |
| Fraser Capital Investments Limited | Arts & recreation | 2017 |
| Fraser Cope Limited | Real estate | 2017 |
| Freedom Van LAB Ltd | Manufacturing | 2026 |
| Freeman Paul Services LLP | | 2010 |
| Freemont Escapes Limited | Professional & scientific | 2019 |
| Freya Helps ME Ltd | Professional & scientific | 2023 |
| FRF7 Limited | Arts & recreation | 2025 |
| Friarglade Limited | Extraterritorial | 1998 |
| Friars Wood Residents Company (Bishop's Stortford) Limited | Households | 1987 |
| Friends Dress Agency Ltd | Wholesale & retail | 2023 |
| Friends of Bsrfc Ltd | Arts & recreation | 2020 |
| Fringe Reformer Ltd | Other services | 2025 |
| Fringe.Yoga Epping Limited | Arts & recreation | 2019 |
| Frodo Properties Ltd | Construction | 2022 |
| From the Chair Counselling Limited | Health & social care | 2017 |
| FRP Holdings Limited | Professional & scientific | 2007 |
| Fruit Shack Blends Ltd | Manufacturing | 2025 |
| FT Logic Limited | Information & communication | 2026 |
| Fuel Box Vending Ltd | Administrative & support | 2026 |
| Fulton's Automatic Driving School Ltd | Education | 2022 |