| Fire Safety Management Solutions Limited | Professional & scientific | 2016 |
| Firesafetyofficer.Com Limited | Administrative & support | 2013 |
| Firespark (UK) Limited | Professional & scientific | 2022 |
| First 1 Club Ltd | Arts & recreation | 2010 |
| First Surveying Ltd | Professional & scientific | 2023 |
| First TEE Technology Ltd | Information & communication | 2021 |
| Fish and Chips 366 Limited | Hospitality | 2016 |
| Fisher Holdings Limited | Arts & recreation | 2015 |
| Fisher Property Holdings Limited | Real estate | 2019 |
| Fitzroy & Finch Ltd | Wholesale & retail | 2021 |
| Fitzroy Hotel Ltd | Real estate | 2022 |
| Five Houses Holdings Limited | Financial services | 2024 |
| Five Islands Capital Limited | Information & communication | 2018 |
| Fixed Income Services Consulting Ltd | Professional & scientific | 2020 |
| Fizzies and Sundays Limited | Manufacturing | 2025 |
| FL Richmond Ltd | Real estate | 2026 |
| FL Richmond Property Ltd | Real estate | 2026 |
| Flairshare Limited | Real estate | 1988 |
| Flamingo Public Relations Limited | Professional & scientific | 2017 |
| Flash Electric Services Ltd | Construction | 2025 |
| Flash TM Limited | Construction | 2019 |
| Flatberg Limited | Households | 1984 |
| Flavoil Ltd | Manufacturing | 2011 |
| Flaze (U.K) Limited | Wholesale & retail | 2003 |
| FLC Open Doors Ltd | Real estate | 2015 |
| Flexyfoto Limited | Manufacturing | 2018 |
| Flintview Residents Association Limited | Real estate | 1983 |
| Flooring Trade Ltd | Construction | 2019 |
| Floquote Limited | Information & communication | 2021 |
| Flora Beauty Lounge Ltd | Other services | 2019 |
| Flowers by Primrose Ltd | Manufacturing | 2022 |
| Fluxin Limited | Professional & scientific | 2024 |
| Flying Eagles Yoga Ltd | Education | 2020 |
| Flying Orange Career Academy Ltd | Administrative & support | 2026 |
| Flyingstudionet Ltd | Other services | 2023 |
| Flylife Limited | Administrative & support | 2003 |
| Flynow.Com Limited | Financial services | 2001 |
| FMX Management Ltd | Real estate | 2019 |
| FMX Properties Ltd | Real estate | 2019 |
| FNL Management Ltd | Real estate | 2018 |
| Focus Financial (NE) Limited | Financial services | 2015 |
| Focus Independent Financial Advisers Limited | Extraterritorial | 1990 |
| Focus Insurance Consultants Ltd | Extraterritorial | 2015 |
| Focus Living Ltd | Households | 2025 |
| Focus Metals Ltd | Wholesale & retail | 2008 |
| Focusync (UK) Limited | Information & communication | 2003 |
| Fold Form Ltd | Manufacturing | 2026 |
| Fone Access Limited | Wholesale & retail | 1998 |
| Fonteva Emea Ltd | Professional & scientific | 2016 |
| Food Consulting International Limited | Professional & scientific | 2006 |
| Food for Thought (Guildford) Limited | Wholesale & retail | 1983 |
| Food for Thought (KEW) Limited | Wholesale & retail | 2004 |
| Fooddeli Ltd | Wholesale & retail | 2020 |
| Foodies Find Love Ltd | Other services | 2026 |
| Football Escapes Limited | Arts & recreation | 2016 |
| Football Management Services Limited | Administrative & support | 2003 |
| Footprint PR Limited | Professional & scientific | 2022 |
| Force 4 Good Consultancy Ltd | Professional & scientific | 2014 |
| Forces Homes Limited | Real estate | 2006 |
| Forces Homes Mortgages Ltd | Financial services | 2018 |
| Fore Lexa Limited | Professional & scientific | 2017 |
| Forestry and Countryside Management Limited | Agriculture & fishing | 2003 |
| Forever Wood Floors Ltd | Wholesale & retail | 2024 |
| Forge Lane Ltd | Real estate | 2013 |
| Forget-Me-Not Creations Ltd | Information & communication | 2025 |
| Formium New Malden Ltd | Construction | 2019 |
| Forrest Hospitality Limited | Hospitality | 2022 |
| Fortificy Ltd | Information & communication | 2025 |
| Fortuna Interactive Solutions Limited | Information & communication | 2024 |
| Fortune Estates Holdings Ltd | Real estate | 2025 |
| Forty Five Larkfield Road (Richmond) Limited | Households | 1989 |
| Foskett Trading Limited | Administrative & support | 2002 |
| Foster Hill Properties (Bedford) Limited | Real estate | 1960 |
| Foundling Gallery Ltd | Wholesale & retail | 2024 |
| Fountainhead (Design & Construction) Limited | Professional & scientific | 1989 |
| Four Counties Brickwork Limited | Construction | 2025 |
| Four Houses (Petersham) Management Company Limited | Real estate | 2007 |
| Four Square Corners Limited | Manufacturing | 2024 |
| Fourth Lens Ltd | Information & communication | 2025 |
| FOX CUB Developments Ltd | Construction | 2023 |
| FOX Fire & Security Yorkshire Ltd | Administrative & support | 2024 |
| Fox-Atlantic Communications Limited | Information & communication | 2000 |
| Foxaro Property Services Limited | Construction | 2018 |
| Foxlea Manor Perfumery Company Limited(The) | | 1982 |
| Foxrock Management Limited | Professional & scientific | 2018 |
| Frances LEE House Management Company Limited | Households | 2002 |
| Frangipane Investments LLP | | 2020 |
| Frankie Building Maintenance Ltd | Construction | 2022 |
| Frankland Search Limited | Administrative & support | 2016 |
| Fredflo Electrician Ltd | Construction | 2024 |
| Free Motion Pets Ltd | Wholesale & retail | 2017 |
| Freedom Treks Limited | Administrative & support | 2011 |
| Freeforyou Limited | Professional & scientific | 2023 |
| Freet Footwear Ltd | Manufacturing | 2015 |
| French Expressions Limited | Extraterritorial | 1997 |
| Fresh Kebab Holding Limited | Real estate | 2024 |
| Fresh OFF the Block Limited | Manufacturing | 2025 |
| Freshlaw Services Ltd | Professional & scientific | 2022 |
| Freya Barnes PR Ltd | Professional & scientific | 2024 |
| Friars Stile House Residents Association Limited | Administrative & support | 1966 |