| Flavourz Goodmayes Ltd | Wholesale & retail | 2024 |
| Flavr Ltd | Information & communication | 2016 |
| Flaxbil Ltd | Construction | 2023 |
| Fleet International Ltd | Transport & logistics | 2026 |
| Fleet Optima Group Ltd | Manufacturing | 2024 |
| Fleming Nash Healthcare Limited | Wholesale & retail | 2011 |
| Fleming Nash Holdings Limited | Real estate | 2023 |
| Flex Drive (Essex) Ltd. | Administrative & support | 2017 |
| Flex Housing Ltd | Real estate | 2023 |
| Flex IT Services Ltd | Information & communication | 2023 |
| Flexarise Enterprise Limited | Wholesale & retail | 2025 |
| Flexgrove Management Company Limited | Households | 1980 |
| Flexi PAY Systems Limited | Professional & scientific | 2025 |
| Flexicontract Limited | Construction | 2024 |
| Flexipay Technologies Ltd | Information & communication | 2005 |
| Flexlink Solutions Ltd | Transport & logistics | 2024 |
| Flexor Labs Ltd | Information & communication | 2026 |
| Flexship Ltd | Transport & logistics | 2024 |
| Flight Mood Limited | Administrative & support | 2018 |
| Flights Star UK Ltd | Wholesale & retail | 2025 |
| Flip Express Ltd | Hospitality | 2023 |
| Flipper Move UK Ltd | Transport & logistics | 2017 |
| Flippin Smash Limited | Hospitality | 2026 |
| Flipsnack UK Limited | Information & communication | 2022 |
| Flitesure Limited | Administrative & support | 2017 |
| FLN Finance Limited | Professional & scientific | 2013 |
| Flooring Haven Ltd | Wholesale & retail | 2026 |
| Flora Apartments RTM Company Limited | Households | 2024 |
| Flora Lantana Limited | Wholesale & retail | 2024 |
| Flora MZD Limited | Wholesale & retail | 2025 |
| Flora Sense Ltd | Wholesale & retail | 2019 |
| Florai Ltd | Wholesale & retail | 2026 |
| Floral Decor & Events Ltd | Hospitality | 2023 |
| Flore Properties Limited | Real estate | 2024 |
| Florence Goodbold Limited | Other services | 2023 |
| Florence Recruitment Ltd | Administrative & support | 2024 |
| Florentin Property Solutions Ltd | Professional & scientific | 2022 |
| Florian Traders Ltd | Wholesale & retail | 2019 |
| Florida Pharmacy Limited | Wholesale & retail | 1986 |
| Florin David Ltd | Hospitality | 2026 |
| Florin Logistics Limited | Transport & logistics | 2016 |
| Florin Onosa Ltd | Construction | 2019 |
| Florin Tibuleac Ltd | Administrative & support | 2019 |
| Flosylverpenn Ltd | Wholesale & retail | 2025 |
| Flovet Care Services Limited | Administrative & support | 2022 |
| Flower Joy Ltd | Wholesale & retail | 2025 |
| Flowerblitz Ltd | Wholesale & retail | 2024 |
| Flowers of Siam LP | | 2012 |
| Flowery Affair Ltd | Wholesale & retail | 2025 |
| Flowsoft Ltd | Information & communication | 2025 |
| Flowtech Plumbing Services Limited | Other services | 2012 |
| Floyd Property (Ongar) Ltd | Real estate | 2022 |
| FLS Chauffeurs Ltd | Transport & logistics | 2025 |
| Fluaff Limited | Wholesale & retail | 2024 |
| Flutra's Hair & Beauty Ltd | Other services | 2014 |
| Flutter Web Studio Ltd | Wholesale & retail | 2020 |
| Flux Merchant Ltd | Wholesale & retail | 2025 |
| Flux Staffing Ltd | Professional & scientific | 2026 |
| FLY Higher Nova Ltd | Information & communication | 2025 |
| FLY Payroll Ltd | Administrative & support | 2023 |
| FLY to Pakistan Ltd | Administrative & support | 2021 |
| FLY Trip Overseas Ltd | Administrative & support | 2025 |
| Flycatchers Global Ltd | Professional & scientific | 2024 |
| Flyers Sports Academy Ltd | Education | 2017 |
| Flying Artwork Ltd | Professional & scientific | 2022 |
| Flying Trading Ltd | Wholesale & retail | 2020 |
| Flyjunction Limited | Administrative & support | 2025 |
| Flynsky Limited | Administrative & support | 2020 |
| FM Auto Trading Ltd | Wholesale & retail | 2025 |
| FM Care and Consultancy Limited | Health & social care | 2013 |
| FM CLINIC8 Ltd | Health & social care | 2013 |
| FM Expertise Limited | Administrative & support | 2024 |
| FM Nationwide Ltd | Administrative & support | 2023 |
| FM Prime Services Ltd | Administrative & support | 2026 |
| Fmcc Enterprise Ltd | Administrative & support | 2023 |
| FMJ Security Limited | Administrative & support | 2026 |
| Fmkcarriages Ltd | Wholesale & retail | 2025 |
| FML Estates Ltd | Real estate | 2016 |
| Fmpwelding Ltd | Manufacturing | 2024 |
| FN Global Limited | Wholesale & retail | 2026 |
| FN Investments Ltd | Real estate | 2024 |
| FN Management Limited | Administrative & support | 2023 |
| FNA Traders Ltd | Wholesale & retail | 2025 |
| FND Communications Ltd | Information & communication | 2021 |
| FND Engineering UK Limited | Information & communication | 2023 |
| FND Group Limited | Financial services | 2023 |
| Fnsons Motors Ltd | Wholesale & retail | 2023 |
| Focus LX Ltd | Other services | 2019 |
| Focus Recruitment Limited | Administrative & support | 2015 |
| Fofis Ltd | Real estate | 2025 |
| Folan Mechanical Engineering Limited | Construction | 2019 |
| Foley Tech Systems Ltd | Information & communication | 2025 |
| Folly Yard Real Estate Limited | Real estate | 2021 |
| Folstar Care Limited | Health & social care | 2026 |
| Fone Avenue Limited | Wholesale & retail | 2024 |
| Fone Clinic (Ilford) Limited | Wholesale & retail | 2024 |
| Fone Tech Solutions Limited | Wholesale & retail | 2010 |
| Fonefix Point Rainham Ltd | Other services | 2020 |
| Fonefix SK Ltd | Wholesale & retail | 2025 |
| Fonno Ltd | Wholesale & retail | 2025 |