| Fanica Roman Ltd | Construction | 2013 |
| Fanshaw Limited | Real estate | 1999 |
| Farah Design Services Limited | Professional & scientific | 2018 |
| Farelord Limited | Administrative & support | 2026 |
| Faris Consultancy Services Ltd | Professional & scientific | 2021 |
| Farm Catering Ltd | Hospitality | 2025 |
| Farm Manor Estates Ltd | Households | 2025 |
| Farm Wembley Ltd | Extraterritorial | 2024 |
| Farmsphere Tech Ltd | Information & communication | 2026 |
| Farnam Street Ltd | Financial services | 2023 |
| Farnsworth Partners Ltd | Professional & scientific | 2024 |
| Fasener Limited | Wholesale & retail | 2022 |
| Fasgrin Limited | Extraterritorial | 2017 |
| Fashion 360 UK Limited | Manufacturing | 2022 |
| Fashion Jewellery and Souvenir Ltd | Wholesale & retail | 2025 |
| Fashonic Leather Company Limited | Manufacturing | 2020 |
| Fast Homes Property Ltd | Households | 2023 |
| Fast to Kill Pest Experts Ltd | Administrative & support | 2025 |
| Fast to LET Ltd | Real estate | 2018 |
| Fasterj.Com Limited | Information & communication | 2003 |
| Fastfood Takeaway Ltd | Hospitality | 2014 |
| FAT Design Studio UK Limited | Professional & scientific | 2024 |
| Fayzano Limited | Financial services | 2020 |
| Fazal Education Ltd | Education | 2023 |
| Fazeli Enterprise Ltd | Manufacturing | 2018 |
| FC Builders London Ltd | Construction | 2019 |
| FCM Landscaping Ltd | Administrative & support | 2025 |
| FCS Computer Systems (Emea) Limited | Information & communication | 2006 |
| Featherstone Limited | Real estate | 1985 |
| Featherstone Residential Properties Limited | Real estate | 1981 |
| Featured Homes UK Limited | Construction | 2015 |
| Feinkop Limited | Real estate | 2026 |
| Fela Ltd | Real estate | 2020 |
| Feldix Limited | Wholesale & retail | 2014 |
| Felicity Montagu Productions Ltd | Administrative & support | 2009 |
| Felman Capital Properties Ltd | Real estate | 2026 |
| Felridge Limited | Professional & scientific | 2025 |
| Feltonbrook Limited | Professional & scientific | 2019 |
| Fennwork House Ltd | Professional & scientific | 2023 |
| Fenny Wharf Ltd | Real estate | 2025 |
| Fentone Ltd | Real estate | 2008 |
| Fercau Utilities Ltd | Construction | 2022 |
| Fern Publishing Limited | Information & communication | 2019 |
| Fernhurst Gardens Ltd | Real estate | 2014 |
| Fernhurst Solutions Ltd | Real estate | 2022 |
| Ferreira Holdings Limited | Financial services | 2021 |
| Ferroelectric Engineering Consultants Limited | Professional & scientific | 2025 |
| Fersi Limited | Wholesale & retail | 2026 |
| Fewan Limited | Professional & scientific | 2025 |
| FGX Ltd | Other services | 2023 |
| FH Pizza Ltd | Hospitality | 2024 |
| FHJ Legal Services Limited | Professional & scientific | 2021 |
| Fi-Zah Kids Ltd | Other services | 2020 |
| Fico Capital Ltd | Real estate | 2020 |
| Fidelitas (London) Limited | Wholesale & retail | 2011 |
| Field Trading Limited | Wholesale & retail | 2024 |
| Fieldes Construction Ltd | Construction | 2020 |
| Figaro Entertainment Limited | Construction | 2024 |
| Filbrook Limited | Professional & scientific | 2025 |
| Filbury Limited | Professional & scientific | 2025 |
| Filip Ciprian Ltd | Transport & logistics | 2024 |
| Filip Services Limited | Construction | 2017 |
| Fillow Health and Cosmetic Limited | Wholesale & retail | 2025 |
| Film 71 Limited | Information & communication | 2023 |
| Filta Limited | Administrative & support | 2007 |
| Finalytix Limited | Professional & scientific | 2021 |
| Finance Advice Helpline Limited | Professional & scientific | 2018 |
| Finance Contractors Limited | Professional & scientific | 2007 |
| Financial Accounts Limited | Professional & scientific | 2009 |
| Finbuild Ltd | Construction | 2026 |
| Finchley Cars Ltd | Wholesale & retail | 2023 |
| Find a Care Home Services Ltd | Health & social care | 2022 |
| Fine Choice Limited | Wholesale & retail | 2006 |
| Fine Food Pizza Limited | Hospitality | 2025 |
| Fine Gold Insurance Services Limited | Financial services | 2011 |
| Fine Software Solutions Ltd | Wholesale & retail | 2020 |
| Fineday Enterprises Ltd | Hospitality | 2012 |
| Finedge Estates Limited | Real estate | 1995 |
| Finesse Car Body Repairs Ltd | Wholesale & retail | 2024 |
| Finestone Chabbat Limited | Wholesale & retail | 2018 |
| Finflow Limited | Information & communication | 2014 |
| Finstond Limited | Professional & scientific | 2023 |
| Fintech Power Media Ltd | Information & communication | 2023 |
| Finter Limited | Administrative & support | 2018 |
| Fiona Ltd | Real estate | 2025 |
| Fipax Limited | Professional & scientific | 2007 |
| Fire Drop Ltd | Wholesale & retail | 2024 |
| Fire Safety Team Limited | Public administration | 2024 |
| Fire Test Consultancy Ltd | Professional & scientific | 2021 |
| Fireaway North West London Ltd | Hospitality | 2021 |
| Firehorse Design Limited | Information & communication | 2017 |
| Firestone Pizza Ltd | Hospitality | 2024 |
| Firmhill Estates Limited | Real estate | 2018 |
| Firmsapp Limited | Administrative & support | 2017 |
| Firs Groundworks Limited | Construction | 2012 |
| First Atlantic Finance Limited | Financial services | 2013 |
| First City Management Consultants Limited | Professional & scientific | 2008 |
| First Class Electric Ltd | Construction | 2024 |
| First Class Floss Ltd | Hospitality | 2026 |
| First Dimension Limited | Real estate | 1987 |