| FHK Group Ltd | Hospitality | 2023 |
| Fibregate Limited | Manufacturing | 2025 |
| Fidus UK Ltd | Other services | 2013 |
| Field and Foliage Ltd | Administrative & support | 2025 |
| Fieldhouse Family Ltd | Construction | 2020 |
| Fieldwise Ltd | Professional & scientific | 2023 |
| Fierce Universe Ltd | Other services | 2015 |
| Fieri Properties Ltd | Extraterritorial | 2023 |
| Fiesta Bossa Ltd | Real estate | 2019 |
| Fiesta Crafts Limited | Wholesale & retail | 1995 |
| Fifth Properties Limited | Real estate | 2017 |
| Fighting Dirty Ltd | Professional & scientific | 2023 |
| Figsone Limited | Wholesale & retail | 2025 |
| Figures Make Billions Limited | Wholesale & retail | 2020 |
| Filey Care and Support Ltd | Health & social care | 2014 |
| Filha DA LUZ Ltd | Wholesale & retail | 2021 |
| Filiprom Company Ltd | Hospitality | 2015 |
| Fillebrook Launderette & DRY Cleaners Limited | Other services | 2018 |
| Filo Food Catering Ltd | Wholesale & retail | 2021 |
| Fimeo Ltd | Professional & scientific | 2008 |
| Finact Consulting Ltd | Administrative & support | 2019 |
| Finance 5D Ltd | Information & communication | 2013 |
| Finance AI 360 Limited | Wholesale & retail | 2025 |
| Finance LUX Ltd | Professional & scientific | 2019 |
| Finance Management Solutions Limited | Financial services | 2014 |
| Financial Lens Ltd | Real estate | 2017 |
| Financial Prosperity LP | | 2015 |
| Financing Enterprise Limited | Financial services | 2008 |
| Financior Developer Limited | Construction | 2020 |
| Financior Recruitment Agency Ltd | Administrative & support | 2022 |
| Fincon Capital Management UK Ltd | Professional & scientific | 2024 |
| Fine Art Handlers Limited | Other services | 2004 |
| Fine Line Medical Ltd | Health & social care | 2024 |
| Finest Funerals Limited | Other services | 2015 |
| Firas & Hadi Coaching Ltd | Arts & recreation | 2026 |
| Firs Farm Tennis Ltd | Education | 2020 |
| First Choice Home Appliances Limited | Wholesale & retail | 2016 |
| First Choice I Ltd | Wholesale & retail | 2025 |
| First Class Driver Limited | Transport & logistics | 2025 |
| First Class Turkish Barber Essex Ltd | Other services | 2022 |
| First Concept Services Ltd | Administrative & support | 2018 |
| First Drive London Ltd | Education | 2018 |
| First Generation Ltd | Wholesale & retail | 2024 |
| First Kalms Limited | Wholesale & retail | 2000 |
| First Kicks Sports Limited | Administrative & support | 2011 |
| First Meadow Limited | Wholesale & retail | 2017 |
| First Rate Roofing Ltd | Construction | 2020 |
| First Recruit Services Limited | Administrative & support | 2024 |
| First Rung Limited | Education | 1987 |
| First Tech Motors Ltd | Wholesale & retail | 2025 |
| First Wellington Road Management Limited | Households | 1973 |
| FIRST2DESIGN Ltd | Information & communication | 2008 |
| Firtree Build Ltd | Construction | 2024 |
| Fisher Darville Holdings Limited | Professional & scientific | 2001 |
| Fisher Research Ltd | Manufacturing | 1988 |
| Fishnet Sourcing Ltd | Wholesale & retail | 2018 |
| Fiska Construction Ltd | Manufacturing | 2023 |
| Fitness Plus Martial Art Limited | Arts & recreation | 2015 |
| Fitscalesuk Ltd | Health & social care | 2025 |
| Five Fruits Limited | Wholesale & retail | 2019 |
| Five Stars (Jarrow) Limited | Other services | 2016 |
| Five Visi ARP & Co Ltd | Wholesale & retail | 2026 |
| FIX & Shine Maintenance Ltd | Construction | 2025 |
| FIX Building Ltd | Construction | 2020 |
| FIX IT Property Ltd | Construction | 2022 |
| Fix'D Maintenance Property Ltd | Construction | 2024 |
| FIX4SURE Limited | Construction | 2026 |
| Fixup Ltd | Other services | 2015 |
| FK Domestics Ltd | Administrative & support | 2003 |
| FKO Group Ltd | Information & communication | 2026 |
| FL@ Painting Ltd | Construction | 2025 |
| Flag Electrical London Ltd | Other services | 2024 |
| Flair Property Ltd | Real estate | 2017 |
| Flame Grill (Kent) Limited | Hospitality | 2016 |
| Flamess F@Rce Engineers Limited | Construction | 2019 |
| Flamingo Management Ltd | Households | 2026 |
| Flamur Construction Limited | Construction | 2016 |
| Flamy Cleaning Services Limited | Administrative & support | 2025 |
| Flash Remove Limited | Transport & logistics | 2025 |
| Flashtag Booths Limited Partnership | | 2015 |
| FLATS4ALL London LLP | | 2018 |
| FLATS4ALL Ltd | Real estate | 2017 |
| Flavas Chicken Ltd | Hospitality | 2025 |
| Flawlessflowhair Ltd | Other services | 2025 |
| Flemibab Trading Limited | Wholesale & retail | 2020 |
| Flex Lifestyle Group Ltd | Wholesale & retail | 2022 |
| Flexday Management Ltd | Wholesale & retail | 2024 |
| Flexibridge Care Ltd | Health & social care | 2026 |
| Flexnext Limited | Wholesale & retail | 2020 |
| Flitwick Commercial Vehicles Limited | Wholesale & retail | 1978 |
| Floating Pictures Limited | Information & communication | 2012 |
| Flor DO Amor Limited | Extraterritorial | 2019 |
| Flora Foods Ltd | Wholesale & retail | 2018 |
| Florgail Real Estate Co LLP | | 2024 |
| Florgail Real Estate Limited | Real estate | 2024 |
| Flori Electrical Services Ltd | Construction | 2023 |
| Flotino Limited | Real estate | 2015 |
| Flourish World Limited | Wholesale & retail | 2024 |
| Flow (Finances Life Overstanding Wealth) Ltd | Information & communication | 2017 |
| Flowered UP Ltd | Wholesale & retail | 2019 |