| Fintech Links Ltd | Administrative & support | 2025 |
| Finvora Group Ltd | Information & communication | 2026 |
| Fioritura Limited | Wholesale & retail | 2006 |
| Firelog Ltd | Wholesale & retail | 2001 |
| Firepro Safetech Limited | Construction | 2024 |
| Firo Sports Ltd | Wholesale & retail | 2026 |
| Firozdin Properties Ltd | Real estate | 2022 |
| Firozzarifi Ltd | Wholesale & retail | 2023 |
| First Choice Building Supplies Limited | Wholesale & retail | 2013 |
| First Choice Chauffeurs Limited | Transport & logistics | 2012 |
| First Choice Transport Ltd | Manufacturing | 2025 |
| First Division Electrical Limited | Construction | 2019 |
| First Docklands Property Management Limited | Real estate | 2002 |
| First Impression Unisex Salon Limited | Other services | 2013 |
| First United Overseas Ltd | Professional & scientific | 2026 |
| Firstkey Estates UK Ltd | Real estate | 2025 |
| Fiskol Ltd | Wholesale & retail | 2022 |
| Fit Froyo Limited | Hospitality | 2025 |
| Fitted Wardrobes Ltd | Manufacturing | 2013 |
| Five Hands Together Ltd | Real estate | 2022 |
| Five Pillars Academy Ltd | Education | 2026 |
| Five River Bar & Grill Limited | Hospitality | 2026 |
| Five River Marquees Ltd | Hospitality | 2018 |
| Five Rivers Bar & Club Ltd | Hospitality | 2023 |
| Five Rivers Roofing Limited | Construction | 2025 |
| Five Star Import and Export Ltd | Wholesale & retail | 2023 |
| Five Star Nails (Hayes) Limited | Other services | 2016 |
| Five Star Wholesalers Ltd | Wholesale & retail | 2024 |
| FIX Granite Limited | Construction | 2019 |
| Fixmydrive Ltd | Professional & scientific | 2026 |
| Fixura Interiors London Limited | Construction | 2023 |
| Flackwell Food and Wine Ltd | Wholesale & retail | 2022 |
| Flair Housing Limited | Real estate | 2021 |
| Flair Trading Limited | Real estate | 2013 |
| Flame on GAS and Plumbing Ltd | Administrative & support | 2017 |
| Flames Food Ltd | Hospitality | 2025 |
| Flaming AXE Ltd | Wholesale & retail | 2021 |
| Flash Finds Ltd | Wholesale & retail | 2024 |
| Flavours Express Ltd | Hospitality | 2026 |
| Flaxen Estates Ltd | Real estate | 2019 |
| Fleetx Cars Ltd | Administrative & support | 2025 |
| Fleogan Ltd | Transport & logistics | 2023 |
| Flex Builders Ltd | Construction | 2022 |
| Flex-Go Energy Limited | Energy | 2023 |
| Flick Send Logistics Limited | Transport & logistics | 2025 |
| Flip Elevate Ltd | Professional & scientific | 2025 |
| Flip Mantra Limited | Real estate | 2025 |
| Flip Transport Ltd | Transport & logistics | 2022 |
| Flogratra Limited | Health & social care | 2014 |
| Floor Fusion Ltd | Construction | 2026 |
| Floral Affair London Ltd | Arts & recreation | 2025 |
| Floree Ltd | Construction | 2018 |
| Floreo Properties Limited | Real estate | 2025 |
| Florin Gavriluta Building Ltd | Construction | 2022 |
| Flourish Community Homecare Limited | Health & social care | 2022 |
| Flowers by Anna Stout Ltd | Wholesale & retail | 2026 |
| Flowers House 8B Ltd | Real estate | 2025 |
| Flowertown Limited | Other services | 2014 |
| FLY High Contracts Ltd | Construction | 2018 |
| FLY on Cars Limited | Transport & logistics | 2023 |
| FLY Pinas UK Ltd | Administrative & support | 2018 |
| FLY Zone Express Ltd | Administrative & support | 2019 |
| FLY2WORLD UK Ltd | Administrative & support | 2023 |
| Flying Ltd | Wholesale & retail | 2020 |
| Flyplaces Ltd | Transport & logistics | 2011 |
| FM Lodge Ltd | Hospitality | 2025 |
| FM Power Plumbing and Heating Ltd | Construction | 2025 |
| Fmat Services Ltd | Transport & logistics | 2022 |
| Fmbc Barber Ltd | Other services | 2024 |
| FMM Chauffeuring Services Ltd | Transport & logistics | 2026 |
| Fmsr Properties Ltd | Real estate | 2026 |
| FMZ Limited | Wholesale & retail | 2012 |
| Fnik Media Ltd | Information & communication | 2019 |
| Foam Wash Ltd | Administrative & support | 2023 |
| Focus Security & FM Services Limited | Administrative & support | 2024 |
| Focus Services FCS Limited | Administrative & support | 2025 |
| Fogfathers UK Ltd | Wholesale & retail | 2015 |
| Fohzia Ahmed Holdings Ltd | Professional & scientific | 2020 |
| Fone Accessories & Vape Ltd | Wholesale & retail | 2024 |
| Fone World Reading Ltd | Wholesale & retail | 2025 |
| Fonegenes-Uk Limited | Other services | 2008 |
| Fones Clinic MK Limited | Wholesale & retail | 2021 |
| Food & Juice Corner Ltd | Extraterritorial | 2018 |
| Food Bazaar Ltd | Wholesale & retail | 2019 |
| Food Canvas UK Ltd | Wholesale & retail | 2024 |
| Food Cloud Limited | Hospitality | 2020 |
| Foodspeed Limited | Wholesale & retail | 2000 |
| Football and Fitness Training Ltd | Education | 2021 |
| Force Global Ltd | Transport & logistics | 2025 |
| Forest Enterprises London Ltd | Construction | 2021 |
| Forever Homes Fostering Agency Ltd | Health & social care | 2024 |
| Forex Cargo UK Co. Ltd | Transport & logistics | 1999 |
| Forge Residents Association Limited(The) | Households | 1985 |
| Forgetech Limited | Information & communication | 2023 |
| Formatpad Ltd | Information & communication | 2017 |
| FORTIFY24 Ltd | Administrative & support | 2025 |
| Fortis London Builders Ltd | Construction | 2025 |
| Fortis Manpower Ltd | Administrative & support | 2026 |
| Fortmax. Ltd | Administrative & support | 2025 |
| Fortunax Ltd | Wholesale & retail | 2023 |