| Fornya Solutions Ltd | Information & communication | 2019 |
| Fortes Transport Ltd | Transport & logistics | 2016 |
| Forthright Roofing Ltd | Construction | 2024 |
| Fortify MR Limited | Professional & scientific | 2023 |
| Fortify Research CIC | Professional & scientific | 2023 |
| Fortis Care Limited | Health & social care | 2012 |
| Fortrus Limited | Information & communication | 2003 |
| Forward Comms Limited | Wholesale & retail | 2007 |
| Foster Films Limited | Information & communication | 2008 |
| Fosters Legal LLP | | 2015 |
| Fosters Legal Solicitors Ltd | Professional & scientific | 2011 |
| Foundations for Hope | Health & social care | 2012 |
| Foundry Walk (Earls Colne) Management Company Limited | Households | 2003 |
| Four Seasons, Plumbing, Heating & Renewables Ltd | Construction | 2025 |
| Fourm Studio Ltd | Arts & recreation | 2026 |
| Fourway Communication Limited | Construction | 1962 |
| Fourway International Limited | Information & communication | 2015 |
| Foxco Plumbing & Heating Limited | Construction | 2023 |
| FQG Ltd | Wholesale & retail | 2017 |
| FRACTAL5 Solutions Ltd | Information & communication | 2023 |
| Fragments Group Ltd | Information & communication | 2021 |
| Fragrance Revolution Limited | Manufacturing | 2025 |
| Framehub Ltd | Wholesale & retail | 2025 |
| Francis House RTM Company Limited | Households | 2024 |
| Franngoz Ltd | Hospitality | 2024 |
| FRC Care Limited | Health & social care | 2021 |
| Fredah's Insightful Coaching Ltd | Professional & scientific | 2024 |
| Freddie Arthur Ltd | Real estate | 2021 |
| Fredericas Limited | Extraterritorial | 2012 |
| Fredrickson Bobadilla Ltd | Public administration | 2023 |
| Free Agent (UK) Limited | Professional & scientific | 2003 |
| Free Trade Wharf Management Company Limited | Real estate | 1994 |
| Freed (Veneers) Limited | Wholesale & retail | 2000 |
| Freeform Fabrication Limited | Manufacturing | 2003 |
| Freeline Holdings (UK) Limited | Financial services | 2020 |
| Freeline Therapeutics Holdings Limited | Financial services | 2020 |
| Fremtid Holdings Limited | Financial services | 2026 |
| Frenzi Apps Global Ltd | Information & communication | 2024 |
| Frenzi Apps UK Ltd | Information & communication | 2020 |
| Fresh Photo House Limited | Professional & scientific | 2012 |
| Fresher Solutions Ltd | Wholesale & retail | 2011 |
| Freshwater Accountancy Services Limited | Professional & scientific | 2014 |
| Fresson Freehold Property Owners Ltd | Real estate | 2010 |
| Friend Foods Limited | Hospitality | 2025 |
| Frith Services Limited | Administrative & support | 2019 |
| Froggy Grips Ltd | Other services | 2019 |
| Froghall BTL Limited | Real estate | 2024 |
| Froghug Films Limited | Information & communication | 2025 |
| Frogmore Alternative Events Limited | Arts & recreation | 2014 |
| Frogmore Farming Ltd | Agriculture & fishing | 2020 |
| Front Street Administration Limited | Administrative & support | 2014 |
| Frostfix Property Maintenance Limited | Construction | 2026 |
| Fruity DON Group Limited | Financial services | 2021 |
| Fruity DON Limited | Other services | 2019 |
| FS Willis Consulting Limited | Professional & scientific | 2006 |
| FSI Ventures & Co. Ltd | Construction | 2024 |
| FSM Consultancy Ltd | Professional & scientific | 2020 |
| FSV SPV 2023 Limited | Other services | 2023 |
| FT Hardware Solutions Ltd | Information & communication | 2011 |
| Fuel Drain Limited | Water & waste | 2010 |
| Full Scope Limited | Real estate | 2023 |
| Full Tilt (London) Limited | Administrative & support | 2019 |
| Fullstack Development Industries Ltd | Professional & scientific | 2025 |
| Funtok Ltd | Manufacturing | 2011 |
| Furniture & Home Improvement Ombudsman | Other services | 2022 |
| Furntec Ltd | Wholesale & retail | 2010 |
| Fuselink Group Ltd | Construction | 2024 |
| Fusion Integration Limited | Information & communication | 1999 |
| Fussell & Earth Ltd | Real estate | 2019 |
| Future Automation Limited | Administrative & support | 2007 |
| Future Ballers Ltd | Arts & recreation | 2023 |
| Future Farm Innovation Ltd | Education | 2026 |
| Future Sound & Vision Limited | Manufacturing | 2004 |
| Future Sound and Vision Holdings Limited | Financial services | 2015 |
| Future Thinking Family Limited | Real estate | 2026 |
| Future Youth Inspired Ltd | Education | 2023 |
| Futurtek Ltd | Wholesale & retail | 1999 |
| FVW Healthcare Ltd | Health & social care | 2021 |
| G & J Car Sales (Bedfordshire) Ltd | Wholesale & retail | 2002 |
| G & J Property Investment Ltd | Real estate | 2020 |
| G & M Ellis Ltd | Administrative & support | 2019 |
| G & T Building Services Limited | Construction | 2017 |
| G a N Training Limited | Transport & logistics | 2014 |
| G Douglas Electrical Ltd | Construction | 2021 |
| G Jones Electrical Services Ltd | Construction | 2022 |
| G Killick Construction Ltd | Construction | 2018 |
| G Naylor Construction Services Ltd | Construction | 2022 |
| G P Cars (Pound Avenue) Limited | Administrative & support | 2009 |
| G P Cars Limited | Wholesale & retail | 2005 |
| G P H Systems Limited | Professional & scientific | 1998 |
| G V Health Limited | Manufacturing | 1993 |
| G V Landscaping Commercial Ltd | Administrative & support | 2023 |
| G V Landscaping Domestic Ltd | Administrative & support | 2023 |
| G V Trading Limited | Extraterritorial | 2016 |
| G&B Electrics Limited | Construction | 2019 |
| G&D Graveley Limited | Hospitality | 2018 |
| G&S Capital Limited | Administrative & support | 2025 |
| G.M. Transport Solutions Ltd | Transport & logistics | 2019 |
| G.O. International (U.K.) Limited | Wholesale & retail | 1994 |
| Gaber Editing Ltd | Professional & scientific | 2018 |