| Federal-Mogul Engineering Limited | Professional & scientific | 1920 |
| Federal-Mogul Global Growth Limited | Financial services | 1997 |
| Federal-Mogul Limited | Manufacturing | 1920 |
| Federal-Mogul Technology Limited | Professional & scientific | 1969 |
| Federal-Mogul UK Powertrain Limited | Professional & scientific | 2015 |
| Federal-Mogul Valvetrain Limited | Financial services | 2014 |
| Federation Hotels Group | Extraterritorial | 2012 |
| Federation of Jewish Services | Health & social care | 2006 |
| Federation of Wwoof Organisations | Education | 2013 |
| Federity-X Limited | Information & communication | 2025 |
| FEE Fuelled Fitness Ltd | Health & social care | 2026 |
| FEE Grant Healthcare Ltd | Health & social care | 2025 |
| Feedar Ltd | Information & communication | 2019 |
| Feegenny Limited | Administrative & support | 2009 |
| Feel Better Later Limited | Professional & scientific | 2025 |
| Feel Fashion Limited | Wholesale & retail | 2023 |
| Feel Good CBT Limited | Wholesale & retail | 2021 |
| Feel Good Club Ltd | Wholesale & retail | 2019 |
| Feel Good Hub Ltd | Arts & recreation | 2026 |
| Feel Strong Physio Ltd | Health & social care | 2020 |
| Feel the Benefit Ltd | Information & communication | 2026 |
| Feelbliss Wellbeing CIC | Hospitality | 2023 |
| Feelgood Firstaid CIC | Health & social care | 2006 |
| Feemz Ltd | Administrative & support | 2026 |
| Feenix Enterprises Ltd | Hospitality | 2018 |
| Feentoo Limited | Wholesale & retail | 2025 |
| Feet First Podiatry Clinic Limited | Real estate | 2026 |
| Feet First Reflexology by Andrea Limited | Administrative & support | 2025 |
| FEFES3 Ltd | Health & social care | 2023 |
| Fega Limited | Education | 2021 |
| Feghas UK Limited | Other services | 2025 |
| FEI Yang Limited | Hospitality | 2019 |
| Feifeijiang Ltd | Wholesale & retail | 2026 |
| Feignn Limited | Wholesale & retail | 2023 |
| Feingold Financial Services Limited | Financial services | 2004 |
| Feiniao Ltd | Wholesale & retail | 2025 |
| Feirge Ltd | Professional & scientific | 2025 |
| Feisty Fork Ltd | Manufacturing | 2025 |
| Fekrix Limited | Information & communication | 2026 |
| Fela Group Limited | Hospitality | 2026 |
| Felba Limited | Information & communication | 2021 |
| Felcon Healthcare Limited | Administrative & support | 2024 |
| Feldart Collection Ltd | Wholesale & retail | 2020 |
| Feldent Limited | Health & social care | 2008 |
| Felic-It Limited | Information & communication | 2025 |
| Felice Property Services Limited | Construction | 2020 |
| Felician Prestige Property Services Limited | Real estate | 2022 |
| Felicidad Trading Limited | Wholesale & retail | 2025 |
| Felicini's Restaurants Limited | Hospitality | 1984 |
| Felicity Children's Care Group Ltd | Health & social care | 2025 |
| Felicity Clothes Limited | Wholesale & retail | 2025 |
| Felicity Security Ltd | Administrative & support | 2017 |
| Felicleen Ltd | Households | 2012 |
| Felipe Recruitment Operations Limited | Professional & scientific | 2026 |
| Felix Core Holdings Limited | Wholesale & retail | 2025 |
| Felix Corp Ltd | Financial services | 2025 |
| Felix Landau Limited | Wholesale & retail | 2021 |
| Felix Larkin Ltd | Wholesale & retail | 2026 |
| Felixlumumba Ltd | Other services | 2023 |
| Felizo Ltd | Transport & logistics | 2019 |
| Felizvivencia Ltd | Extraterritorial | 2024 |
| Felklin Ltd | Administrative & support | 2025 |
| Fell Bars Limited | Hospitality | 2017 |
| Fell Brewery Limited | Administrative & support | 2011 |
| Fell Building Consultancy Limited | Construction | 2024 |
| Fellmont Wealth Ltd | Financial services | 2024 |
| Fellows Events Limited | Administrative & support | 2026 |
| Felltop Court Management Company Limited | Households | 2000 |
| Felmar Homes Limited | Real estate | 2023 |
| Felmoor Ltd | Real estate | 2004 |
| Felon Ltd | Other services | 2022 |
| Felora Limited | Wholesale & retail | 2023 |
| Felt IT Limited | Wholesale & retail | 2025 |
| Felt Medical Communications Ltd | Professional & scientific | 2022 |
| Feltham (Manchester) Limited | Administrative & support | 2016 |
| Feltham Court Management Ltd | Real estate | 2021 |
| Feltham Estates Limited | Administrative & support | 1996 |
| Feltham Group (North) Limited | Construction | 1981 |
| Feltham Holdings Limited | Administrative & support | 1996 |
| Feltham Investments Limited | Real estate | 2016 |
| Feltham Management Limited | Real estate | 1996 |
| Feltham Manchester Lettings Limited | Real estate | 2018 |
| Feltham Property Ltd | Administrative & support | 2018 |
| Feltonhall Estates Ltd | Real estate | 2005 |
| Feltonhall Properties Ltd | Extraterritorial | 2007 |
| Fely Délice Limited | Other services | 2024 |
| Femaho Ltd | Extraterritorial | 2025 |
| Female Alpha Ltd | Wholesale & retail | 2025 |
| Female Business Festival and Awards Limited | Administrative & support | 2024 |
| Female Focus Limited | Health & social care | 2018 |
| Fembab Limited | Professional & scientific | 2020 |
| Fembo Care Ltd | Health & social care | 2023 |
| Femelle Pro Ltd | Other services | 2022 |
| Femi Segun Madariola Security Limited | Public administration | 2024 |
| Femikay Services Ltd | Health & social care | 2023 |
| Feminine Festival Bridalwear Ltd | Wholesale & retail | 2024 |
| Femluxe Limited | Wholesale & retail | 2020 |
| Femme Aura Ltd | Wholesale & retail | 2024 |
| Femme-Elite UK Ltd | Information & communication | 2024 |
| Femmes Chretiennes ET Entrepreneuriat Ltd | Administrative & support | 2022 |