| Fempower | Other services | 2019 |
| Femroll Property Limited | Hospitality | 2024 |
| Femsam Global Limited | Health & social care | 2022 |
| Femsco Energy Services Ltd | Construction | 2025 |
| Femsco Properties Ltd | Financial services | 2025 |
| Femson International Ltd | Health & social care | 2020 |
| Femsportex Limited | Arts & recreation | 2025 |
| Femto Ltd | Information & communication | 2024 |
| Femvibe Ltd. | Wholesale & retail | 2024 |
| FEN 153 NO 2 Ltd | Extraterritorial | 2019 |
| Fence - Scape Ltd | Manufacturing | 2018 |
| Fence Buddy (UK) Ltd | Wholesale & retail | 2021 |
| Fenchem GB Limited | Wholesale & retail | 2024 |
| Fenchurch Recovery SPV Limited | Financial services | 2026 |
| Fenflower Developments Limited | Construction | 2016 |
| Feng LI Ltd | Hospitality | 2024 |
| Feng Yida Ltd | Hospitality | 2026 |
| Fengwhoo Trade Ltd | Wholesale & retail | 2025 |
| Fenix Forge Ltd | Wholesale & retail | 2025 |
| Fenix Modelling Solutions Ltd | Information & communication | 2025 |
| Fenix Property Limited | Real estate | 2024 |
| Fenix Restaurants Limited | Hospitality | 2020 |
| Fennelrestaurant Limited | Hospitality | 2026 |
| Fenoché Audrey Ltd | Wholesale & retail | 2025 |
| Fenqo Path Ltd | Wholesale & retail | 2025 |
| Fenso Co Ltd | Wholesale & retail | 2026 |
| Fenstanton Transport Ltd | Transport & logistics | 2014 |
| Fenston Hill Ltd | Construction | 2026 |
| Fentech Solutions Limited | Extraterritorial | 2021 |
| Fentol Limited | Professional & scientific | 2018 |
| Fenton House Limited | Real estate | 2023 |
| Fentons Solicitors LLP | | 2006 |
| Fenyx Clothing Ltd | Wholesale & retail | 2025 |
| Ferchichi&Sons Driveways and Patios Ltd | Professional & scientific | 2023 |
| Ferdani UK Limited | Professional & scientific | 2021 |
| Ferg Properties Limited | Real estate | 2020 |
| Fergi Payroll Ltd | Information & communication | 2025 |
| Fergus Software Systems (UK) Limited | Information & communication | 2021 |
| Ferguson & Co Accountants Ltd | Professional & scientific | 2014 |
| Ferguson & Timpson (Metal Fabrications) Ltd. | Manufacturing | 1985 |
| Ferguson Financial Services Limited | Financial services | 2024 |
| Feri Toys Limited | Manufacturing | 2025 |
| Ferment to BE Ltd | Wholesale & retail | 2025 |
| Fern & Brick Ltd | Real estate | 2025 |
| Fern & Green Ltd | Hospitality | 2017 |
| Fern Crest Realty Group Ltd | Extraterritorial | 2026 |
| Fern Line Capital Management Ltd | Extraterritorial | 2026 |
| Fern Transport Ltd | Transport & logistics | 2014 |
| Fernbank Plumbing & Bathrooms Ltd | Construction | 2023 |
| Fernbank Waste Solutions Limited | Water & waste | 2018 |
| Ferndale Accountancy Consulting Ltd | Professional & scientific | 2024 |
| Ferndale Heights Limited | Administrative & support | 2025 |
| Ferndale Properties Ltd | Real estate | 2001 |
| Ferndee Limited | Real estate | 2019 |
| Fernebourne Limited | Administrative & support | 1998 |
| Fernhawk Limited | Real estate | 2025 |
| Fernhead Management Ltd | Real estate | 2018 |
| Fernica Residential Care Home Limited | Extraterritorial | 2012 |
| Fernlee Services Limited | Real estate | 2005 |
| Fernvale Properties Limited | Extraterritorial | 2021 |
| Ferox Hall Limited | Real estate | 2019 |
| Ferran Norway Holding Limited | Financial services | 2025 |
| Ferravolt UK Ltd | Manufacturing | 2025 |
| Ferreira House Ltd | Hospitality | 2026 |
| Ferrel Construction Ltd | Construction | 2019 |
| Ferrous Pharma Ltd | Wholesale & retail | 2022 |
| Ferrovia Limited | Professional & scientific | 2022 |
| Ferrox Leather Ltd | Wholesale & retail | 2025 |
| Ferryhill Stores Limited | Wholesale & retail | 2003 |
| Ferrystone Construction Ltd | Construction | 2026 |
| Fersion Computer Technology Co Ltd | Information & communication | 2015 |
| Ferson Estates Limited | Real estate | 2021 |
| Fervet Opus Ltd | Professional & scientific | 2025 |
| Fervor Ltd | Information & communication | 2026 |
| Ferw Ltd | Wholesale & retail | 2025 |
| FES Pharma Ltd | Health & social care | 2022 |
| Fess Pro Line Ltd | Other services | 2019 |
| Festival & Events Group Ltd | Extraterritorial | 2014 |
| Festival Bars MCR Ltd | Hospitality | 2025 |
| Festival of Friendship Ltd | Administrative & support | 2021 |
| Festivals Master Ltd | Financial services | 2022 |
| Festivals Supreme Master Ltd | Financial services | 2023 |
| Festive Road Group Limited | Professional & scientific | 2024 |
| Festive Road International Ltd | Professional & scientific | 2016 |
| Festora Events Ltd | Hospitality | 2026 |
| Feto Security Services Ltd | Administrative & support | 2025 |
| Fetosin Limited | Health & social care | 2022 |
| Fever Project Ltd | Other services | 2013 |
| Fewell Property Limited | Real estate | 2021 |
| Fexmar Childcare Ltd | Health & social care | 2022 |
| Feyu Studio Ltd | Arts & recreation | 2023 |
| FEZ Trading Ltd | Extraterritorial | 2011 |
| Fezoj Trading Limited | Other services | 2018 |
| FF Design Ltd | Manufacturing | 2015 |
| FF Eros Services Ltd | Construction | 2021 |
| FF HCM Ltd | Wholesale & retail | 2023 |
| FF House 32 Limited | Real estate | 2025 |
| FF Nexus Ltd | Wholesale & retail | 2026 |
| FF Pizza Ltd | Hospitality | 2019 |
| FF Properties Ltd | Real estate | 2025 |