| Feel Good Clothing Ltd | Wholesale & retail | 2019 |
| Feel.Hq Ltd | Information & communication | 2026 |
| Feenix Holding Ltd | Financial services | 2026 |
| Feery Railway Consultants Limited | Construction | 2019 |
| Fegi IP Limited | Wholesale & retail | 2025 |
| FEM Shoyez UK Ltd | Administrative & support | 2025 |
| Femas Quality Services Limited | Professional & scientific | 2024 |
| Femty Limited | Health & social care | 2024 |
| FEN Plant & Aggregates Limited | Administrative & support | 2014 |
| FEN VEG Ltd | Hospitality | 2022 |
| FEN Windows Cambs Ltd | Construction | 2025 |
| Fencor Packaging Group Limited | Professional & scientific | 1999 |
| Fendex Holdings Limited | Financial services | 2015 |
| Fendex Limited | Construction | 2008 |
| Fenea Holdings Ltd | Financial services | 2025 |
| Feng WAH Express Limited | Hospitality | 2023 |
| Fengate Auto Repair Limited | Wholesale & retail | 2023 |
| Fengate Breakers Limited | Administrative & support | 2016 |
| Fengate Investments Ltd | Construction | 2020 |
| Fengate Limited | Hospitality | 2016 |
| Fengate Property Services Limited | Administrative & support | 2025 |
| Fengate Service Centre Ltd | Wholesale & retail | 2025 |
| Fengate Tyres & Services Ltd | Wholesale & retail | 2025 |
| Fenix Trans Ltd | Transport & logistics | 2023 |
| Fenlake Business Centre Management Company Limited | Professional & scientific | 1988 |
| Fenlake Car Sales Ltd | Wholesale & retail | 2019 |
| Fenlake Properties Limited | Real estate | 2021 |
| Fenland Adventure Limited | Education | 2020 |
| Fenland Air Conditioning Limited | Construction | 2025 |
| Fenland Aquapark Ltd | Arts & recreation | 2021 |
| Fenland Autos Limited | Wholesale & retail | 2015 |
| Fenland Community Radio CIC | Information & communication | 2024 |
| Fenland Direct Cremation Services Ltd | Other services | 2026 |
| Fenland Electrical Services Ltd | Manufacturing | 2024 |
| Fenland Fresh Logistics Limited | Transport & logistics | 2019 |
| Fenland Furniture Ltd | Manufacturing | 2017 |
| Fenland Grow CIC | Agriculture & fishing | 2026 |
| Fenland Site Safe Ltd | Construction | 2022 |
| Fenland Stoneworks Ltd. | Wholesale & retail | 2008 |
| Fenland Used Car Sales Limited | Wholesale & retail | 2019 |
| Fenland Youth Radio CIC | Education | 2020 |
| Fenlandia CIC | Other services | 2023 |
| Fenmere Industries Ltd | Water & waste | 2026 |
| Fens Leisure Group Ltd | Agriculture & fishing | 2024 |
| Fenton Developments (Cambs) Limited | Real estate | 2024 |
| Fenton Industrial Ltd | Real estate | 2023 |
| Fercu Brothers Construction Ltd | Construction | 2024 |
| Ferghaus Properties Ltd | Real estate | 2025 |
| Ferments and Cultures Limited | Manufacturing | 2021 |
| Fermor Property Group Limited | Real estate | 2019 |
| Fern Asset Management Limited | Construction | 2024 |
| Fern Music UK Ltd Ltd | Arts & recreation | 2022 |
| Fernandes Property Investments Ltd | Administrative & support | 2023 |
| Ferndale Electronics Limited | Manufacturing | 2007 |
| Fernwood K.M. Residents Management Company Limited | Households | 2021 |
| Festivo Ltd | Administrative & support | 2024 |
| Fettiplace Consulting Limited | Professional & scientific | 2023 |
| FEW Holding Limited | Financial services | 2022 |
| FF Compassionate Care Ltd | Health & social care | 2025 |
| FFF Jamie Woodall Limited | Arts & recreation | 2025 |
| Fflv Ltd | Wholesale & retail | 2021 |
| FFS (Ashton) Ltd | Real estate | 2016 |
| FFT1 Limited | Hospitality | 2022 |
| FG Wilson (Engineering) Limited | Extraterritorial | 1989 |
| FH Assets Ltd | Real estate | 2021 |
| FH Store Ltd | Wholesale & retail | 2025 |
| Fhreedom Ltd | Administrative & support | 2023 |
| Fibre Consulting Limited | Other services | 2025 |
| Fibre Optech Ltd | Information & communication | 2017 |
| Fidoto Ltd | Wholesale & retail | 2021 |
| Fidus Accounting Ltd | Extraterritorial | 2018 |
| Fidus Achates Ltd | Real estate | 2022 |
| Fieldfair Escapes Limited | Administrative & support | 2025 |
| Fieldpax Limited | Manufacturing | 1998 |
| Fields END Trucks Limited | Administrative & support | 1970 |
| Fields END Water Limited | Hospitality | 2009 |
| Fiffik Limited | Information & communication | 2021 |
| Fifteen Seventy Three Limited | Hospitality | 2009 |
| Fifth Avenue Leisure Ltd | Hospitality | 2024 |
| Fifty Five (Estates Management) Ltd | Professional & scientific | 2016 |
| Fifty Five (Products) Ltd | Construction | 2022 |
| FIG & Olive Group (UK) Limited | Real estate | 2020 |
| Fighting Panther Ltd | Administrative & support | 2016 |
| Figtail Ltd | Real estate | 2023 |
| Figtree House Ltd | Information & communication | 2021 |
| Figures (UK) Accountancy Services Limited | Professional & scientific | 2007 |
| Fiji Cink Ltd | Real estate | 2020 |
| Fiji Health Limited | Health & social care | 2021 |
| Fijian Tropical Hardwoods Limited | Wholesale & retail | 2021 |
| Fika by Baker Ltd | Hospitality | 2025 |
| Fikafinity Limited | Hospitality | 2025 |
| Fikkerts Limited | Manufacturing | 1990 |
| Fikuma Ltd | Information & communication | 2025 |
| Filgo Trans Ltd | Transport & logistics | 2015 |
| Filip IT Limited | Information & communication | 2020 |
| Filmsim Ltd | Arts & recreation | 2008 |
| Filo Group Holdings Ltd | Financial services | 2023 |
| FILTR8 (Water Filtration) Limited | Manufacturing | 2026 |
| Final Chapter Limited | Wholesale & retail | 2025 |
| Financial Line Limited | Extraterritorial | 2019 |