| Fleet Street Investments Ltd | Real estate | 2017 |
| Fleet-Line Services Ltd | Wholesale & retail | 2025 |
| Fleetwood Holiday Lettings Limited | Hospitality | 2025 |
| Fleetwood Oak Hotel Limited | Hospitality | 2013 |
| Fleetwood PPP Limited | Administrative & support | 2001 |
| Fleetwood ST Property Management Ltd | Extraterritorial | 2023 |
| Fleetwood Vapes Ltd | Wholesale & retail | 2026 |
| Fleming Associates (Preston) Ltd | Professional & scientific | 2021 |
| Fletcher IT Limited | Information & communication | 2014 |
| Fletchers Gardens and Driveways Limited | Administrative & support | 2013 |
| Fletchers Interior Fitout Limited | Construction | 2022 |
| Fletco Carpets Ltd. | Wholesale & retail | 2021 |
| Fleur Boutique Ltd | Wholesale & retail | 2020 |
| Fleur Rose Ltd | Other services | 2020 |
| Fleurametz UK Limited | Wholesale & retail | 1999 |
| Flex Fleet Community CIC | Education | 2026 |
| Flex Fleet Ltd | Education | 2026 |
| Flex QA Solutions Ltd | Information & communication | 2026 |
| Flex Spa Ltd | Arts & recreation | 2025 |
| Flex-E-Lease Limited | Administrative & support | 2022 |
| Flexecare Ltd | Health & social care | 2025 |
| Flexi Fidgets Co. Ltd | Wholesale & retail | 2024 |
| Flexi FLY Ltd | Arts & recreation | 2024 |
| Flexidesk Ltd | Wholesale & retail | 2026 |
| Flexiroof UK Ltd | Construction | 2012 |
| Flextex (Holdings) Limited | Financial services | 2008 |
| Flextex Limited | Manufacturing | 1985 |
| Flexyfoot Limited | Wholesale & retail | 2020 |
| FLG Mortgages Ltd | Financial services | 2023 |
| FLG Roofing and Building Ltd | Construction | 2025 |
| Flight & Holidays Limited | Administrative & support | 2020 |
| Flight Connects Ltd | Transport & logistics | 2025 |
| Flight Crowd Limited | Professional & scientific | 2021 |
| Flight PA Limited | Administrative & support | 2012 |
| FLIGHTSCANNER360 Limited | Information & communication | 2026 |
| Float Wellness Studio Ltd | Health & social care | 2025 |
| Floating Pontoon Solutions Limited | Administrative & support | 2012 |
| Flock & Skein Ltd | Wholesale & retail | 2023 |
| Flomer Refinishing Limited | Wholesale & retail | 2022 |
| Flonext Ltd | Wholesale & retail | 2026 |
| Floor Test Limited | Construction | 2011 |
| Flooring HQ Solutions Ltd | Wholesale & retail | 2025 |
| Flooring Retail Limited | Wholesale & retail | 2024 |
| Flooring Tools Direct Limited | Wholesale & retail | 2017 |
| Floorplan Group Ltd | Construction | 2000 |
| Floorslip Limited | Construction | 2011 |
| Flora Beauty Ltd | Other services | 2018 |
| Florentindenis Ltd | Wholesale & retail | 2025 |
| Florentinmirel Ltd | Water & waste | 2025 |
| Florenzo Furniture Ltd | Wholesale & retail | 2025 |
| Florna Plants Limited | Wholesale & retail | 2016 |
| Florna Transport Ltd | Wholesale & retail | 2020 |
| Florrie Mitton Limited | Wholesale & retail | 2010 |
| Flourish & Shine Ltd | Wholesale & retail | 2025 |
| Flourish Learning for Youth Ltd | Education | 2026 |
| Flourish Therapy Clinic Ltd | Health & social care | 2022 |
| Flow Connections CIC | Education | 2024 |
| Flower Accounting Limited | Professional & scientific | 2020 |
| Flowers by Nyiahh Limited | Wholesale & retail | 2025 |
| Flowmatic Business Solutions Ltd | Information & communication | 2025 |
| Flowora Ltd | Other services | 2026 |
| Flowsafe Traffic Management Limited | Transport & logistics | 2026 |
| FLT Community Trading Limited | Arts & recreation | 2010 |
| Fluid Tech Support Ltd | Information & communication | 2014 |
| Flusafe Domestic and Commercial Ltd | Extraterritorial | 2022 |
| Flusafe Ltd | Construction | 1985 |
| FLY Anyway CIC | Professional & scientific | 2021 |
| Flying Solo Events Ltd | Other services | 2017 |
| Flying Sparks Limited | Construction | 2006 |
| Flying Start Families Community Interest Company | Education | 2026 |
| Flynn Electrical Contractors Ltd | Construction | 2019 |
| Flynn Manor Properties Limited | Real estate | 2025 |
| FM Demolition Services Ltd | Construction | 2026 |
| FM Domestic Installations Ltd | Construction | 2012 |
| FM Domestic LLP | | 2025 |
| FM Electrical Solutions Ltd | Construction | 2010 |
| FM Waste Limited | Water & waste | 2018 |
| FMA Universal Ltd | Professional & scientific | 2017 |
| Fmcg Distribution UK Ltd | Wholesale & retail | 2025 |
| Fmcg NW Limited | Wholesale & retail | 2025 |
| Fmcg Wholesale Supplies Ltd | Wholesale & retail | 2025 |
| Fmgs Law Limited | Professional & scientific | 2010 |
| FMS Plastics Europe Ltd | Manufacturing | 2016 |
| FMT Driving School Ltd | Education | 2025 |
| Fmumar Holdings Ltd | Real estate | 2023 |
| FNM Properties Limited | Real estate | 2024 |
| FO (Rochdale) Ltd | Arts & recreation | 2016 |
| FO Herbs Ltd | Wholesale & retail | 2026 |
| Foamhaven Ltd | Wholesale & retail | 2023 |
| Focalmart Ltd | Wholesale & retail | 2023 |
| Focused Investments Limited | Real estate | 1995 |
| Focussed Boxing Limited | Hospitality | 2025 |
| Fodus Foods Limited | Wholesale & retail | 2025 |
| Folan Construction Limited | Construction | 2023 |
| Foldhouse Park Limited | Hospitality | 1992 |
| Foley Property Management Ltd | Real estate | 2022 |
| Follen (Bolton LE Sands) Ltd | Wholesale & retail | 2023 |
| Follen (Forton) Ltd | Wholesale & retail | 2013 |
| Follen (Ribchester) Ltd | Wholesale & retail | 2013 |
| Folly Lane Holdings Limited | Professional & scientific | 2023 |