| Film Transmission Limited | Arts & recreation | 2018 |
| Filtacool (London South West) Ltd | Professional & scientific | 2009 |
| Filtreo UK Ltd | Wholesale & retail | 2014 |
| Fina Fitrotul Qolbi Trading Limited | Wholesale & retail | 2025 |
| Finadvice Ltd | Information & communication | 2025 |
| Finage Ltd | Information & communication | 2020 |
| Finance Fest Limited | Professional & scientific | 2025 |
| Finance Solutions Jacek Limited | Administrative & support | 2018 |
| Financial Freedom Limited | Wholesale & retail | 2025 |
| Financial Software Group Ltd | Professional & scientific | 2012 |
| Fincare Ltd | Professional & scientific | 2025 |
| Finch Management Services Limited | Construction | 2017 |
| Finchelm Limited | Real estate | 2005 |
| Find a Hand Group Ltd | Information & communication | 2026 |
| Find Your Flow Consulting Limited | Administrative & support | 2021 |
| Findgames Ltd | Information & communication | 2021 |
| Finding Golf Limited | Information & communication | 2013 |
| Fine Finish Southern Ltd | Construction | 2024 |
| Finefield Consulting Ltd | Professional & scientific | 2017 |
| Fineline Fabrications Limited | Construction | 2003 |
| Fineline Group Limited | Construction | 2025 |
| Finelli Consultancy Limited | Professional & scientific | 2025 |
| Finesse Marine Ltd | Manufacturing | 2018 |
| Finezza Limited | Hospitality | 2025 |
| Finishingtouches Ltd | Construction | 2024 |
| Finitor Wealth Platform Ltd | Financial services | 2024 |
| Finnternational Ltd | Information & communication | 2021 |
| Fintail Ltd | Professional & scientific | 2024 |
| Fintora Ltd | Information & communication | 2024 |
| Fioreto Ltd | Wholesale & retail | 2025 |
| FIR Tree Lodge Freehold Limited | Households | 2016 |
| Fire & Insurance Risk Engineering Ltd | Professional & scientific | 2017 |
| Fire Compliance & Safety (Bournemouth) Limited | Administrative & support | 2009 |
| Fire Systems Trading Ltd | Construction | 2017 |
| Fireboy-Xintex UK Operations Limited | Manufacturing | 2017 |
| Firebrick Energy Services Ltd | Wholesale & retail | 2023 |
| Firefly Accounting Ltd | Professional & scientific | 2025 |
| Firehorse Group Limited | Information & communication | 2022 |
| Firepush Ltd | Information & communication | 2017 |
| Firestone Property Ltd | Real estate | 2026 |
| Firmasite Ltd | Information & communication | 2022 |
| Firs Road Investments Limited | Financial services | 2013 |
| First Choice OFF License Ltd | Wholesale & retail | 2024 |
| First Class Kits Ltd | Wholesale & retail | 2015 |
| First Packing Limited | Hospitality | 2025 |
| First Person Design Limited | Professional & scientific | 2019 |
| First Point Photography Ltd | Professional & scientific | 1995 |
| FIRST4GROUP(SOUTH) Ltd | Construction | 2026 |
| FIRSTAID4SPORT Limited | Extraterritorial | 2021 |
| Firstlink I.T. Solutions Limited | Information & communication | 2000 |
| Firth Service Holdings Limited | Health & social care | 2021 |
| Firtree Associates Limited | Health & social care | 1996 |
| Fischel UK Limited | Financial services | 2015 |
| Fiscus Solutions Ltd | Administrative & support | 2012 |
| Fish & Bills Ltd | Information & communication | 2023 |
| Fisher Chips Ltd | Information & communication | 2020 |
| Fishermans Walk Ltd | Households | 2023 |
| Fitkid Limited | Administrative & support | 1995 |
| Fitmediaservicesuk Ltd | Professional & scientific | 2023 |
| Fitnexe Limited | Information & communication | 2013 |
| Fitrite South Central Ltd | Construction | 2019 |
| Fitz- FLO Drainage Solutions Ltd | Water & waste | 2025 |
| Five Financial Wealth Management Ltd | Financial services | 2021 |
| Five Five Fitness Limited | Education | 2006 |
| Five Star Convenience Limited | Wholesale & retail | 2009 |
| Five Star Enterprises (Global) Ltd | Wholesale & retail | 2017 |
| Fiveash Consulting Ltd | Health & social care | 2020 |
| Fiveways Barber Ltd | Other services | 2018 |
| Fiveways Catering Limited | Hospitality | 2003 |
| Fixithut Limited | Wholesale & retail | 2025 |
| Fixt Developments Limited | Professional & scientific | 2025 |
| Fixx'D Ltd | Information & communication | 2025 |
| Fiza Care Homes Ltd | Financial services | 2025 |
| Fizmay Group Ltd | Financial services | 2025 |
| Fizz Bikes Limited | Administrative & support | 2016 |
| Fjcf Holdings Ltd | Financial services | 2024 |
| Flack Manor Brewery Limited | Manufacturing | 2009 |
| Flaco Films Ltd | Information & communication | 2021 |
| Flagging Rights Ltd | Wholesale & retail | 2025 |
| Flaghead Developments Limited | Construction | 2013 |
| Flaghead Photographic Limited | Wholesale & retail | 2005 |
| Flair Sport and Leisure Ltd | Education | 2009 |
| Flamedev Ltd | Information & communication | 2025 |
| Flamingonions Ltd | Professional & scientific | 2019 |
| Flanagan Estates Ltd | Real estate | 2024 |
| Flash Wardrobe Limited | Health & social care | 2022 |
| Flat 29 260 Field END Road Ltd | Real estate | 2026 |
| Flat 4 Avon Court Ltd | Real estate | 2020 |
| Flat Management Limited | Households | 2006 |
| Flatrate Services Group Ltd | Information & communication | 2022 |
| FLC Properties Limited | Real estate | 2006 |
| Fleet Court Flat Management (Poole) Limited | Households | 1974 |
| Fleetally Ltd | Transport & logistics | 2025 |
| Fleetwood MAY Ltd | Professional & scientific | 2026 |
| Fletch Developments Limited | Administrative & support | 2010 |
| Flex Marketing Ltd | Wholesale & retail | 2022 |
| Fleximind Limited | Health & social care | 2024 |
| Flexinorr Ltd | Wholesale & retail | 2025 |
| Flexprice Ltd | Wholesale & retail | 2021 |
| Flexx Cafe Limited | Hospitality | 2025 |