| Forward Thinking Advisory Ltd | Professional & scientific | 2024 |
| FOS MC 126 Limited | Wholesale & retail | 2022 |
| Fosprop Limited | Real estate | 2012 |
| Fotia Greek Ltd | Hospitality | 2024 |
| Fotia Restaurant Ltd | Hospitality | 2022 |
| Fotofast Property Company Limited | | 1980 |
| Fouad 1933 Ltd | Real estate | 2022 |
| Found Capital Limited | Other services | 2021 |
| Foundry Bargain Store Ltd | Wholesale & retail | 2020 |
| Fountain Court (Evesham) Limited | Households | 1996 |
| Fountain House Bath Management Company Limited | Households | 2018 |
| Four Abbeville Road Limited | Households | 1983 |
| Four Elements Wear Limited | Wholesale & retail | 2015 |
| Four Philbeach Gardens Management Company Limited | Households | 1988 |
| Four S Auto Service Ltd | Wholesale & retail | 2016 |
| Four Seasons Euphoria Ltd | Manufacturing | 2014 |
| Four Seasons Hastings Ltd | Wholesale & retail | 2015 |
| Four Seasons Wines Ltd | Wholesale & retail | 2022 |
| FOUR58 Creative Limited | Information & communication | 2015 |
| Fouresses Consults Limited | Professional & scientific | 2014 |
| FOURTEEN06 Ltd | Professional & scientific | 2025 |
| Fowler & Sons Design Ltd | Professional & scientific | 2018 |
| FOX & Sticks Ltd | Health & social care | 2020 |
| FOX Umbrellas Limited | Manufacturing | 1999 |
| Foxartis Limited | Construction | 2025 |
| Foxbourne Investments Limited | Households | 2021 |
| Foxglove Gardens (Addlestone) Management Company Limited | Households | 2008 |
| Foxgrove Associates Limited | Administrative & support | 2010 |
| Foxhollow Management Company Limited | Households | 1985 |
| Foxleyhall Limited | Real estate | 1994 |
| Foxton Services Limited | Other services | 2003 |
| Foxtory Ltd | Wholesale & retail | 2026 |
| Foxtrot Defence Ltd | Information & communication | 2022 |
| Fozia Ashiq Enterprise Ltd | Wholesale & retail | 2025 |
| FP 2025 Ltd | Other services | 2025 |
| Fplm Limited | Real estate | 2018 |
| FR (Beaumont) Management Company Limited | Households | 2000 |
| FR (Greenwood) Management Company Limited | Households | 2000 |
| Fractal Invest Limited | Other services | 2008 |
| Fractional Assets Registration and Exchange Ltd | Information & communication | 2024 |
| Frame Express Limited | Wholesale & retail | 2021 |
| Francis Accountancy Services UK Ltd | Professional & scientific | 2020 |
| Francis Court Residents Association Limited | Households | 1997 |
| Francus and Co Ltd | Other services | 2017 |
| Frandanol Developments Ltd | Real estate | 2007 |
| Frank KAY (Flat Management) Limited | Households | 1979 |
| Frankjoma Limited | Health & social care | 2025 |
| Franklins ROW Limited | Households | 1978 |
| Frankllyn & Christian Ltd | Hospitality | 2025 |
| Frankrene Ltd | Professional & scientific | 2021 |
| Fraser Apex Group Ltd | Construction | 2024 |
| Fratork Limited | Professional & scientific | 2017 |
| Frebel Wear Ltd | Wholesale & retail | 2021 |
| Frecrest Properties Limited | Construction | 1961 |
| Fred Care Services Limited | Health & social care | 2019 |
| Fredarren Limited | Health & social care | 2013 |
| Frederick London Limited | Hospitality | 2021 |
| Free Angel Ltd | Households | 2017 |
| Free Cross Limited | Other services | 2024 |
| Free Diamonds Ltd | Hospitality | 2019 |
| Free the Children (UK) | Education | 2010 |
| Freedom Fighters Arts Ltd | Arts & recreation | 2021 |
| FREEDOM1STRIDE-UK. CIC | Transport & logistics | 2020 |
| Freeman Media Ltd | Information & communication | 2025 |
| Freemen's Meadow Residents Management Company Limited | Households | 2004 |
| Freesia Films Ltd | Information & communication | 2022 |
| French Spoon Ltd | Hospitality | 2021 |
| French Street Management Company Limited | Households | 2001 |
| Fresco Supplies Ltd | Wholesale & retail | 2010 |
| Fresh & Easy Coombe Lane Ltd | Wholesale & retail | 2025 |
| Fresh & Tasty Grill Chicken Ltd | Hospitality | 2024 |
| Fresh Accounting Limited | Professional & scientific | 2015 |
| Fresh and Easy London Limited | Wholesale & retail | 2024 |
| Fresh AS a Daisy Food Stores Ltd | Real estate | 2007 |
| Fresh Chippy Limited | Hospitality | 2019 |
| Fresh Food and Beverage Ltd | Wholesale & retail | 2022 |
| Fresh Food and News Limited | Wholesale & retail | 2020 |
| Fresh for Life Limited | Wholesale & retail | 2015 |
| Fresh FRY Limited | Hospitality | 2021 |
| Fresh Market Limited | Wholesale & retail | 2016 |
| Fresh N Fruity London Ltd | Manufacturing | 2024 |
| Fresh Oriental Foods Express Ltd | Hospitality | 2025 |
| Freshcrop Ltd | Water & waste | 2025 |
| Freshstart Care Solutions Limited | Administrative & support | 2013 |
| Frew Building and Construction Ltd | Construction | 2024 |
| Frew's Property Ltd | Real estate | 2024 |
| Freya and Meera Food Ltd | Hospitality | 2025 |
| Friars Walk Management Company Limited | Households | 2001 |
| Friday Ventures Private Limited | Wholesale & retail | 2025 |
| Friendly Cayman LLP | | 2022 |
| Fritz & Gherman Limited | Other services | 2011 |
| Frobisher Court (Greenwich) RTM Company Ltd | Households | 2013 |
| Frontalbytolani Limited | Other services | 2021 |
| Frontcare Ltd | Health & social care | 2023 |
| Frontline Enterprise Limited | Administrative & support | 2024 |
| Frontline Group of Companies Limited | Professional & scientific | 2015 |
| Frontsidecutback Limited | Information & communication | 2015 |
| Frontspruce Property Management Limited | Households | 1991 |
| Frosty Outwear Limited | Manufacturing | 2025 |
| Frothy Coffee HUT Limited | Hospitality | 2024 |