| Fontaine Arts Ltd | Wholesale & retail | 2025 |
| Food & Courier Services Limited | Hospitality | 2025 |
| Food Adda Ltd | Hospitality | 2025 |
| Food Box Pro Limited | Hospitality | 2025 |
| Food FUN Limited | Hospitality | 2014 |
| Food Heaven Carlisle Ltd | Wholesale & retail | 2018 |
| Food Kart Limited | Wholesale & retail | 2025 |
| Foodie Guyz UK Ltd | Hospitality | 2023 |
| Foodology CF72 Limited | Hospitality | 2021 |
| Foods & Inns (UK) Ltd | Extraterritorial | 1980 |
| Footsy 100 Group Ltd. | Real estate | 2026 |
| FOR the Collective Ltd | Wholesale & retail | 2025 |
| FOR the Grill Ltd | Hospitality | 2025 |
| FOR the Love of Children CIC | Education | 2024 |
| FOR Working Parents Ltd | Education | 2022 |
| FOR YOU 24/7 Ltd | Wholesale & retail | 2024 |
| Forb Medics Limited | Health & social care | 2014 |
| Forcastconstruct Limited | Construction | 2025 |
| Ford Street Ltd | Real estate | 2016 |
| Ford Tech Ltd | Wholesale & retail | 2016 |
| Fordham Investments Ltd | Real estate | 2023 |
| Fordwater Industrial Ltd | Real estate | 2022 |
| Foremost Financial Ltd | Financial services | 2023 |
| Forest Autos Limited | Wholesale & retail | 2014 |
| Forest Estates Property Services Limited | Real estate | 2002 |
| Forest Farm Peace Garden | Agriculture & fishing | 2006 |
| Forest Farm Shop Limited | Wholesale & retail | 2013 |
| Forest Friends Innovation Studio Ltd | Information & communication | 2023 |
| Forest Gate Properties Ltd | Real estate | 2017 |
| Forest Green Developments Limited | Construction | 2016 |
| Forest NOR Freehold Ltd | Real estate | 2023 |
| Forest NOR Ltd | Real estate | 2023 |
| Forest Road Garden Centre Ltd | Agriculture & fishing | 2021 |
| Foret Declat Ltd | Other services | 2025 |
| Forever Group Limited | Other services | 2017 |
| Forever Young Limited | Manufacturing | 1994 |
| Forexcrackedvip Ltd | Wholesale & retail | 2025 |
| Forged Capital Ltd | Wholesale & retail | 2025 |
| Forhopp UK Ltd | Wholesale & retail | 2024 |
| Foris Tiney Home Ltd | Health & social care | 2024 |
| Form Ratio Ltd | Professional & scientific | 2022 |
| Forma House London Ltd | Professional & scientific | 2026 |
| Formationcompany Ltd | Extraterritorial | 2025 |
| Formbound Limited | Real estate | 1998 |
| Forme Creative Ltd | Information & communication | 2010 |
| Forme Limited | Professional & scientific | 2025 |
| Formreed Limited | Hospitality | 2023 |
| Forrestprop Ltd | Construction | 2025 |
| Forsyth Group Executive Search Limited | Professional & scientific | 2015 |
| Forsyth Management Limited | Extraterritorial | 1987 |
| Fortex Electrical Services Ltd | Construction | 2020 |
| Fortis Consultancies Ltd | Administrative & support | 2019 |
| Fortis Green LLP | | 2020 |
| Fortis Green Properties (Management) Limited | Households | 1966 |
| Fortitude Group Limited | Information & communication | 2024 |
| Fortitude Investments (IRE) Limited | Construction | 2020 |
| Fortline Services Ltd | Administrative & support | 2025 |
| Fortnuma Limited | Hospitality | 2025 |
| Fortress 24/7 Security Ltd | Administrative & support | 2024 |
| Fortress Locksmiths London Limited | Administrative & support | 2024 |
| Fortrose Holdings Ltd | Real estate | 2024 |
| Fortstone Cleaning Services Ltd | Administrative & support | 2022 |
| Fortune Forever Ltd | Real estate | 2023 |
| Fortune Property Group Ltd | Real estate | 2017 |
| Fortune Restaurant Limited | | 2013 |
| Fortune Smiles Services Ltd | Administrative & support | 2021 |
| Forty Four JMS Kalsana Restaurant Ltd | Hospitality | 2024 |
| Forum Solutions Ltd | Construction | 2021 |
| Forvance Consulting Ltd | Information & communication | 2026 |
| Forward Drive Limited | Transport & logistics | 2010 |
| Forward Property Ventures Limited | Real estate | 2019 |
| Forward Tech Ltd | Information & communication | 2025 |
| Forward-Together-Uk Limited | Administrative & support | 2015 |
| Forwell Construction Ltd | Construction | 2025 |
| Forwell Glazing Ltd | Construction | 2022 |
| Fosragon Limited | Wholesale & retail | 2025 |
| Fossaro Ltd | Administrative & support | 2023 |
| Fossette Retail Co., Ltd | Wholesale & retail | 2021 |
| Founcy Ltd | Wholesale & retail | 2019 |
| Foundation CGI Limited | Information & communication | 2008 |
| Foundations Management Ltd | Households | 2020 |
| Foundry Docks Ltd | Financial services | 2025 |
| Four Acres Taverns Ltd | Hospitality | 2023 |
| Four Cleaner Services Ltd | Administrative & support | 2021 |
| Four Elements Wellness Limited | Other services | 2024 |
| Four Eyes London Limited | Wholesale & retail | 2021 |
| Four Friends Motors Ltd | Wholesale & retail | 2017 |
| Four HER Ltd | Manufacturing | 2019 |
| Four Leaf Wealth Management Ltd | Professional & scientific | 2020 |
| Four Roots Ltd | Real estate | 2025 |
| Four Seasons Drinks Ltd | Wholesale & retail | 2024 |
| Four Star Constructions (UK) Limited | Construction | 2012 |
| Four Stars Coffee Ltd | Other services | 2017 |
| Fourstar Minicabs Ltd | Transport & logistics | 2011 |
| Fourth Southfleet Maintenance Limited | Households | 1962 |
| Fourways House Whitton Limited | Real estate | 2021 |
| Fourways Trading Limited | Information & communication | 2013 |
| Fourwinds Energy Ltd | Construction | 2023 |
| Fowzia Ltd | Wholesale & retail | 2022 |
| FOX Brothers (London) Ltd | Information & communication | 2020 |