| Fit N Active Ltd | Health & social care | 2025 |
| Fit to Grow Limited | Professional & scientific | 2013 |
| Fitaccounts Limited | Professional & scientific | 2024 |
| Fitbooks Accountancy Ltd | Professional & scientific | 2019 |
| Fitcars Ltd | Wholesale & retail | 2020 |
| Fitways Adventures Limited | Arts & recreation | 2013 |
| Fitzgerald Park (Binfield) Management Company Ltd | Real estate | 2016 |
| Five Points Management Company Limited | Real estate | 1995 |
| FIX I.T. Consultancy Ltd | Information & communication | 2015 |
| Fixon Services Ltd | Construction | 2024 |
| Fizz Productions Limited | Professional & scientific | 2018 |
| Fladbury Property Limited | Real estate | 2022 |
| Flame and Spice Limited | Hospitality | 2026 |
| Flash Films Ltd | Information & communication | 2022 |
| Flat 6 Audio Ltd | Information & communication | 2018 |
| Flexible Home Improvement Loans Limited | Financial services | 2008 |
| Flexitforce Ltd | Information & communication | 2024 |
| Flint Lodge Residents' Association Limited | Professional & scientific | 1984 |
| Flitcroft Films Ltd | Information & communication | 2025 |
| Floe Interiors + Staging Ltd | Professional & scientific | 2025 |
| Florentina Court Management Company Limited | Real estate | 2007 |
| Flounce London Limited | Professional & scientific | 2022 |
| Flourish and Thrive Coaching Ltd | Other services | 2023 |
| Flourish PR Ltd | Professional & scientific | 2013 |
| Flow Mathematics Ltd | Education | 2017 |
| Flower Work Shop Limited | Wholesale & retail | 2026 |
| Flowers Traditional Roofing Limited | Construction | 2023 |
| Fluid Record Label Ltd | Information & communication | 2024 |
| Flutter Declutter Ltd | Administrative & support | 2024 |
| Fluxiva Electrical Ltd | Construction | 2026 |
| Fly&Health Limited | Information & communication | 2023 |
| Flying-Spirits Ltd | Professional & scientific | 2008 |
| FM Approvals Limited | Professional & scientific | 2005 |
| FM Supplies Limited | Administrative & support | 2024 |
| Fmallah & Co. Limited | Wholesale & retail | 2026 |
| FME Civil Engineering Ltd | Construction | 2020 |
| FMS Holdco Limited | Financial services | 2016 |
| Foel Fach Wind Farm Limited | Energy | 2022 |
| Folium Cleaning Contracts Ltd | Other services | 2024 |
| Food Consult Limited | Professional & scientific | 1995 |
| Foodpreneurs Collective Limited | Extraterritorial | 2016 |
| Football Education Development Opportunity Limited | Arts & recreation | 2014 |
| Footling Management Limited | Professional & scientific | 2019 |
| Footprint Lettings Ltd | Real estate | 2024 |
| FOR Rangers UK Ltd | Administrative & support | 2019 |
| Forbury Newcastle Limited | Health & social care | 2026 |
| Forelease Labs Ltd | Real estate | 2020 |
| Foresight Business Management Limited | Administrative & support | 2018 |
| Foresight Leasing Limited | Administrative & support | 2013 |
| Foresight Psychology Ltd | Other services | 2019 |
| Forest Bridge School Ltd | Education | 2014 |
| Forest Gate Healthcare Ltd | Health & social care | 2006 |
| Forest Rise Properties Limited | Real estate | 2017 |
| Foreverstar Studios Ltd | Wholesale & retail | 2018 |
| Forexwithharry Ltd | Financial services | 2025 |
| Forge & Fork Ltd | Hospitality | 2025 |
| Forlease 8 Limited | Real estate | 2024 |
| Forlease Limited | Real estate | 2018 |
| Form & Thought Ltd | Professional & scientific | 2025 |
| Fortune International Limited | Other services | 2014 |
| Fortune Pillars Ltd | Real estate | 2020 |
| Fortune Property Services Limited | Real estate | 2020 |
| Forwardview Foundation C.I.C. | Information & communication | 2016 |
| Forwardview Media Group Ltd | Information & communication | 2018 |
| Fossfilms Ltd | Information & communication | 2021 |
| Four Acres Bray Vineyard Ltd | Agriculture & fishing | 2026 |
| Four Horns Ltd | Arts & recreation | 2023 |
| Four Hunjan Group Ltd | Households | 2025 |
| Four O2 Creative Limited | Professional & scientific | 2012 |
| Four Seasons Produce Limited | Administrative & support | 2010 |
| FOURFOR2 Limited | Wholesale & retail | 2007 |
| Fourotters Consultancy Limited | Professional & scientific | 2025 |
| FOX Heywood Limited | Financial services | 2014 |
| Foxbrook Group Ltd | Wholesale & retail | 2018 |
| Foxbury Limited | Professional & scientific | 2015 |
| Foxley Court Equestrian | | 2006 |
| FOZ PVT Ltd | Wholesale & retail | 2023 |
| Frame & Glaze Ltd | Construction | 2024 |
| Frame Focus Media Ltd | Professional & scientific | 2025 |
| Frances Lindsay & Co Family Law Limited | Professional & scientific | 2010 |
| Frank Bush Limited | Real estate | 1947 |
| Frankel Broking Limited | Financial services | 2021 |
| Franklyn Commercial Developments Limited | Construction | 1987 |
| Frarv Limited | Health & social care | 2020 |
| Fraser Vending Ltd | Wholesale & retail | 2025 |
| Frassati Catholic Academy Trust | Education | 2013 |
| Fratons Estate Management Limited | Households | 2004 |
| Freaak OUT Ventures Limited | Hospitality | 2023 |
| Free to Achieve Limited | Information & communication | 2020 |
| Freedom Global Solutions Limited | Administrative & support | 2017 |
| Freedom Home Solutions Limited | Professional & scientific | 2020 |
| Freedom Metals Exchange Ltd | Wholesale & retail | 2025 |
| Freelancers Makeup Ltd | Other services | 2025 |
| Freight Connect Services Limited | Transport & logistics | 2023 |
| French Sports Management Ltd | Arts & recreation | 2022 |
| Fresh & Fabulous Ltd | Other services | 2012 |
| Fresh Approach Design and Build Ltd | Construction | 2011 |
| Friday Design Collective Ltd | Administrative & support | 2017 |
| Frimstone Limited | Mining & quarrying | 1975 |
| Fritazzi Polo Limited | Agriculture & fishing | 2016 |