| Fcs(Mk) Ltd | Administrative & support | 2019 |
| FD & Sons Ltd | Hospitality | 2025 |
| FD Plastering Ltd | Construction | 2019 |
| FDH Global Ltd | Professional & scientific | 2018 |
| FDL Investments Limited | Real estate | 2017 |
| Fdta Limited | Financial services | 2024 |
| Fealty Limited | Information & communication | 2017 |
| Fearlessfit CIC | Arts & recreation | 2025 |
| Feat Works Ltd | Information & communication | 2022 |
| Feather Prime Ltd | Wholesale & retail | 2018 |
| Feather Skin Clinic Ltd | Other services | 2017 |
| Featherfoot High Street WB Limited | Real estate | 2017 |
| Featherfoot ST Stephens Limited | Financial services | 2021 |
| Featherlight Professionals Limited | Professional & scientific | 2016 |
| Feathernest Property Management Limited | Real estate | 2023 |
| Featherpost Limited | Manufacturing | 1989 |
| Featherstone Fuels Limited | Professional & scientific | 2021 |
| Feature Solutions Limited | Information & communication | 1997 |
| Federation of Engine Re-Manufacturers Limited | Other services | 2004 |
| Feel IT Ltd | Other services | 2024 |
| Feelin Fine UK Ltd | Other services | 2024 |
| Feeling Beautiful Ltd | Other services | 2013 |
| Feeling Fruity MK Ltd | Wholesale & retail | 2023 |
| Feelingontrack Limited | Information & communication | 2007 |
| Feezer Limited | Health & social care | 2022 |
| FEF by FEF Collections Ltd | Wholesale & retail | 2019 |
| Fefam Limited | Health & social care | 2021 |
| Fehr Labs Ltd | Information & communication | 2020 |
| FEL Group Limited | Construction | 1997 |
| Felgate IT Solutions Limited | Information & communication | 2011 |
| Felicia Nursery Limited | Agriculture & fishing | 2014 |
| Felicity Smart Infrastructure UK Limited | Information & communication | 2017 |
| Felix Techlabs UK Limited | Information & communication | 2017 |
| Felixstowe Travel Limited | Transport & logistics | 2012 |
| Felomic Ltd | Information & communication | 2017 |
| Femat Ventures Ltd | Real estate | 2023 |
| Fembi Foods Ltd | Wholesale & retail | 2021 |
| Fembi Ltd | Professional & scientific | 2009 |
| Fempire Marketing Limited | Professional & scientific | 2022 |
| Femz and Friends Limited | Administrative & support | 2025 |
| FEN Business Ltd | Wholesale & retail | 2019 |
| Fenchurch Renewables Ltd | Administrative & support | 2015 |
| Fenchurch ST Collective Limited | Professional & scientific | 2026 |
| Feng Shui Life Essence Ltd | Professional & scientific | 2024 |
| Feng YU Ltd | Health & social care | 2011 |
| Fengxi Digital Technology Ltd | Wholesale & retail | 2025 |
| Fengyi Digital Technology Ltd | Wholesale & retail | 2024 |
| Fenis Properties Holdings Limited | Real estate | 2022 |
| Fenix Productions Ltd | Information & communication | 2019 |
| Fenixrising Ltd | Professional & scientific | 2014 |
| Fenny MK Garage Limited | Wholesale & retail | 2026 |
| Fenny Stratford Car Repairs & Mot’S Ltd | Wholesale & retail | 2026 |
| Fenster Glazing & Locks Ltd | Construction | 2018 |
| Fentrap Properties Limited | Real estate | 1998 |
| Ferebee Holdings Limited | Real estate | 2023 |
| Fergies Transport Ltd | Transport & logistics | 2025 |
| Ferguson Engineering Consultants Ltd | Professional & scientific | 2022 |
| Ferguson Property and Investments Limited | Households | 2025 |
| Fern Heath Field Limited | Real estate | 2013 |
| Fern Howard (International) Limited | Manufacturing | 2022 |
| Fern Media Creative Agency Ltd | Information & communication | 2025 |
| Fern-Howard Limited | Manufacturing | 1996 |
| Fernando Housing Solutions Ltd | Real estate | 2020 |
| Ferntree Family Centre Ltd | Health & social care | 2025 |
| Ferren Ltd | Construction | 2025 |
| Ferri Montana Limited | Professional & scientific | 2007 |
| Ferris Builders Limited | Construction | 2012 |
| Fervent Hub Limited | Information & communication | 2020 |
| Festivus Ltd | Arts & recreation | 2014 |
| Feta and Olive Ltd | Hospitality | 2025 |
| Fetch Network Ltd. | Information & communication | 2015 |
| Feud Ltd | Wholesale & retail | 2025 |
| Fevore (ST Albans) Limited | Real estate | 2009 |
| Fevore Group Limited | Professional & scientific | 2006 |
| Fevore Limited | Professional & scientific | 1977 |
| Fewdesigns Limited | Professional & scientific | 2016 |
| Fewertools Ltd | Information & communication | 2026 |
| Fewings TM Ltd | Construction | 2023 |
| Feyia Serwah Ltd | Health & social care | 2009 |
| FEZ Delivery Co. UK Limited | Transport & logistics | 2023 |
| FFF Luca Luppi Limited | Arts & recreation | 2025 |
| FFM Properties Limited | Real estate | 2023 |
| Ffolaji London Ltd | Manufacturing | 2020 |
| FFR Management Limited | Professional & scientific | 2015 |
| FFY Limited | Wholesale & retail | 2010 |
| FG Library Products Limited | Professional & scientific | 2000 |
| FG Studios Limited | Information & communication | 2016 |
| FG Trading Limited | Construction | 2023 |
| FG3 Manufacturing Limited | Manufacturing | 2004 |
| FGC Holdings Ltd | Wholesale & retail | 2016 |
| FGC Land 4 Limited | Construction | 2023 |
| FGM Services Limited | Other services | 2020 |
| Fgmh Services Ltd | Other services | 2012 |
| Fgul Coding Ltd | Information & communication | 2025 |
| FH Executive Letting Ltd | Real estate | 2024 |
| FHL Creative Limited | Information & communication | 2021 |
| FHS Invest Ltd | Real estate | 2024 |
| Fhsr Ltd | Professional & scientific | 2025 |
| FI Data Services Limited | Information & communication | 2013 |
| FI Medicos Limited | Health & social care | 2014 |