| Fetec Limited | Wholesale & retail | 2025 |
| Feuz Electrical Ltd | Construction | 2017 |
| Feyn Agribusiness UK Limited | Wholesale & retail | 2021 |
| FF Legal Services Limited | Other services | 2012 |
| FF Properties & Lettings Limited | Real estate | 2022 |
| Ffee & Co Limited | Manufacturing | 2026 |
| FFF Giovani Siwak Limited | Arts & recreation | 2024 |
| Fftb Limited | Real estate | 2025 |
| FG2H Limited | Professional & scientific | 2008 |
| FGG Properties Limited | Real estate | 2021 |
| FGG Ventures Ltd | Financial services | 2025 |
| FGI (Holdings) Ltd | Financial services | 2024 |
| Fgme Limited | Wholesale & retail | 2013 |
| Fgrc PROJECT97 CIC | Health & social care | 2022 |
| FGS Nexus Ltd | Transport & logistics | 2025 |
| Fgscc Holdings Limited | Financial services | 2019 |
| FH Key Ltd. | Real estate | 2021 |
| FH Takeaway Ltd | Hospitality | 2016 |
| FHA Architectural Services Ltd | Professional & scientific | 2020 |
| FHA Holdings Ltd | Financial services | 2023 |
| FHA Investments Ltd | Hospitality | 2022 |
| FHI (UK) Limited | Financial services | 1998 |
| FHI Holdings Limited | Financial services | 2021 |
| FHL Pharma Limited | Wholesale & retail | 2017 |
| FHP Accounting Services Limited | Professional & scientific | 2018 |
| FHP Living 2026 Limited | Financial services | 2026 |
| FHP Living Holdings Limited | Financial services | 2026 |
| FHP Living Limited | Real estate | 2014 |
| Fibonacci Designs Ltd | Wholesale & retail | 2025 |
| Fibre Comm Solutions Limited | Construction | 1995 |
| Fibre Force Solutions Ltd | Information & communication | 2020 |
| Fibre Technology Ltd | Manufacturing | 1980 |
| Fibreflo Technology Limited | Information & communication | 2024 |
| Fibreshore Limited | Real estate | 2011 |
| FIC Properties Ltd | Real estate | 2025 |
| Fida Medical Ltd | Professional & scientific | 2023 |
| Fida Residential Ltd | Real estate | 2022 |
| Fidak Housing Limited | Real estate | 2022 |
| Fiddian Enterprises Ltd | Administrative & support | 2020 |
| Fidelfadez Limited | Other services | 2023 |
| Fidem Properties Ltd | Real estate | 2020 |
| Fidere Ltd | Wholesale & retail | 2024 |
| Fidhizy Ltd | Administrative & support | 2023 |
| Fidinial Limited | Wholesale & retail | 2018 |
| Fidler Wood Limited | Information & communication | 2020 |
| Fiduciam Solutions Limited | Professional & scientific | 2021 |
| Fiduciary Asset Management Limited | Financial services | 2020 |
| Field Boxmore Bourne (Holdings) Limited | Extraterritorial | 1993 |
| Field Boxmore Bristol (Holdings) Limited | Financial services | 1995 |
| Field Boxmore GB Limited | Extraterritorial | 1932 |
| Field Boxmore II Limited | Professional & scientific | 2004 |
| Field Farm Management Ltd | Households | 2020 |
| Field First Limited | Extraterritorial | 1968 |
| Field Group and Chesapeake Pension Trustee Limited | Financial services | 1991 |
| Field House Radcliffe on Trent Limited | Health & social care | 2015 |
| Field Nestory Limited | Information & communication | 2025 |
| Field Practice Limited | Professional & scientific | 2020 |
| Field Ready Ltd | Information & communication | 2026 |
| Field Trip Midlands Ltd | Administrative & support | 2017 |
| Field View Portfolio Ltd | Real estate | 2019 |
| Field View Residents' Management Company Limited | Households | 2006 |
| Fieldair Limited | Construction | 1954 |
| Fieldbonds Limited | Real estate | 1990 |
| Fieldbonds Southport Limited | Real estate | 2023 |
| Fieldhouse Ltd | Health & social care | 1999 |
| Fieldroom Limited | Manufacturing | 2026 |
| Fields Properties Limited | Real estate | 2002 |
| Fields Property Limited | Real estate | 2015 |
| Fieldwell Estates Ltd | Real estate | 2004 |
| Fieldxhatch Limited | Information & communication | 2025 |
| Fiero Studio Ltd | Information & communication | 2022 |
| Fife Holdco Limited | Construction | 2024 |
| Fifi Bridal Limited | Administrative & support | 2012 |
| Fifty Degrees North Marine Ltd | Professional & scientific | 2016 |
| FIG Olives Limited | Hospitality | 2024 |
| FIG One Solutions Ltd | Education | 2014 |
| FIG. Design Studio Ltd | Professional & scientific | 2020 |
| Figgy Stick Limited | Construction | 2018 |
| Fight's on Simulations Limited | Information & communication | 2025 |
| Fighter Training Online Academy Ltd | Arts & recreation | 2020 |
| Fightr Limited | Information & communication | 2025 |
| Figos Telecom Limited | Professional & scientific | 2010 |
| Fil-Mar Ltd | Transport & logistics | 2018 |
| Fill Pool Ltd | Water & waste | 2016 |
| Fillsafe Systems Limited | Manufacturing | 2003 |
| Filluc Ltd | Transport & logistics | 2019 |
| Film & Broadcast Sound Limited | Information & communication | 2004 |
| Filo Ltd | Real estate | 2026 |
| Filterfinder Limited | Manufacturing | 2023 |
| Filtertechnik Ltd | Wholesale & retail | 2000 |
| Fimarkets Ltd | Information & communication | 2016 |
| FIN Koffee Limited | Hospitality | 2026 |
| FIN Productions Ltd | Information & communication | 2025 |
| Final Touch P & D Ltd | Construction | 2023 |
| Finally Fan-Fair Limited | Other services | 1986 |
| Finalpush Limited | Information & communication | 2019 |
| Finance Payments Limited | Information & communication | 2023 |
| Finance-Cube Ltd | Professional & scientific | 2022 |
| Financial Director Support Ltd | Professional & scientific | 2010 |
| Finapex Holdings Ltd | Financial services | 2026 |