| Fletchers Property Ltd | Real estate | 2010 |
| Fletchers Residential Property Limited | Real estate | 2018 |
| Fletchers Technical Services Limited | Information & communication | 2025 |
| Flexidesk Solutions Limited | Manufacturing | 2025 |
| Flightcase Group Ltd | Manufacturing | 2020 |
| Flightcase Warehouse Ltd | Manufacturing | 1994 |
| Flipcave Ltd | Wholesale & retail | 2025 |
| FLO & DIA Limited | Real estate | 2020 |
| FLO Backoffice Solutions Ltd | Information & communication | 2013 |
| FLO Group Holdings Ltd | Financial services | 2016 |
| FLO Outsourcing Solutions Limited | Professional & scientific | 2015 |
| FLO Payroll Solutions Limited | Administrative & support | 2018 |
| Floortec Limited | Construction | 2006 |
| Florascape Limited | Wholesale & retail | 1980 |
| Florintransinstal Ltd | Construction | 2025 |
| Florinxxl Ltd | Information & communication | 2023 |
| Flow GAS and Plumbing Ltd | Construction | 2023 |
| Flowers and Sons Driveways Limited | Administrative & support | 2019 |
| Flowers by Peggy Marie Limited | Arts & recreation | 2016 |
| Floyd Media Management Ltd | Professional & scientific | 2023 |
| Fluid Property Ltd | Hospitality | 2022 |
| Fluro Clean Limited | Administrative & support | 2025 |
| FLY Leasing Limited | Administrative & support | 2015 |
| Flying Start Training & Development Solutions Limited | Real estate | 2015 |
| Flynn Corporate Limited | Construction | 2017 |
| Flynn Group Limited | Construction | 2017 |
| Flynn Limited | Construction | 1975 |
| Fmpp Group Limited | Administrative & support | 2012 |
| FMV Logistics Limited | Transport & logistics | 2024 |
| Focalpoint Advocacy Limited | Health & social care | 2009 |
| Focus Care Services Limited | Health & social care | 1999 |
| Focus Security & Surveillance Limited | Administrative & support | 2007 |
| Foerster UK Limited | Manufacturing | 1990 |
| Fone Junction Ltd | Wholesale & retail | 2019 |
| Food Planet Ltd | Hospitality | 2025 |
| Footsteps Podiatry Services Limited | Health & social care | 2005 |
| Foram Limited | Professional & scientific | 2013 |
| Foresightmgmt Limited | Professional & scientific | 2023 |
| Forest Assets Limited | Real estate | 2017 |
| Forest Lodges (Elford) Limited | Real estate | 2025 |
| Forestate UK Ltd | Real estate | 2019 |
| Forever Day Limited | Information & communication | 2023 |
| Forever Education Limited | Administrative & support | 2025 |
| Forge Auto Repairs Limited | Wholesale & retail | 2017 |
| Forge Products Limited | Manufacturing | 1987 |
| Forge Stove Enamelling Limited | Manufacturing | 2011 |
| Formd Creative Ltd | Manufacturing | 2017 |
| Formula Communications Limited | Professional & scientific | 1995 |
| Forrest Biomass Partnership Limited | Other services | 2014 |
| Forry Commercial Limited | Professional & scientific | 2019 |
| Forry Limited | Professional & scientific | 2016 |
| Forward Freight Ltd | Transport & logistics | 2026 |
| Fosroc Construction Chemicals Limited | Professional & scientific | 1934 |
| Fosroc International Limited | Professional & scientific | 1969 |
| Fosroc Investments (UK) | Professional & scientific | 2002 |
| Fosroc Mining & Tunnelling Ltd. | Professional & scientific | 1981 |
| Fosroc Top One Limited | Professional & scientific | 2004 |
| Fosroc Top Two Limited | Professional & scientific | 2004 |
| Fosters Properties Limited | Real estate | 2020 |
| Fosters Yard Ltd | Hospitality | 2019 |
| Foston Tyson & Clark Ltd | Real estate | 2016 |
| Foudnry Gym Tamworth Ltd | Arts & recreation | 2025 |
| Foundry Properties Cornwall Limited | Real estate | 2024 |
| Four Champs Ltd | Real estate | 2024 |
| Four Counties Garages Limited | Wholesale & retail | 1974 |
| Four Counties Investments Ltd | Real estate | 2019 |
| Four Counties Restaurant Ltd | Hospitality | 2012 |
| Four Oaks Developers Limited | Construction | 2022 |
| Four Oaks Fencing Ltd | Construction | 2026 |
| Four Oaks Garden Rooms Limited | Construction | 2021 |
| Four Seasons Accounting Limited | Professional & scientific | 2026 |
| FOX & Fern Forest Play Limited | Wholesale & retail | 2026 |
| FOX 2023 Limited | Energy | 2023 |
| FOX Admin Services Ltd | Administrative & support | 2017 |
| FOX Consultancy Limited | Professional & scientific | 2025 |
| Foxrad Transport Limited | Transport & logistics | 2013 |
| Foxsoft Ltd | Information & communication | 2002 |
| Foxwood Management (NO 1) Limited | Hospitality | 1994 |
| FP Executive Search Limited | Administrative & support | 1998 |
| FPH Ltd | Financial services | 2018 |
| Fractional Accounting Limited | Professional & scientific | 2023 |
| Frank Install Holdings Limited | Financial services | 2024 |
| Frank Install Ltd | Construction | 2019 |
| Fraser House Chiropractic Clinic Limited | Health & social care | 2009 |
| Fraser Technologies Limited | Wholesale & retail | 2020 |
| Freakley Incorporated Limited | Other services | 2018 |
| Fred Davis Consultancy Limited | Construction | 2020 |
| Fred Davis Properties Limited | Construction | 2022 |
| Freedom Property Rentals Ltd | Real estate | 2016 |
| Fresolute Limited | Administrative & support | 2011 |
| Friends of Sgarabhaigh Limited | Real estate | 2002 |
| Friulsider UK Limited | Wholesale & retail | 1989 |
| FRP Consultants Ltd | Professional & scientific | 2024 |
| FS Air Conditioning Ltd | Construction | 2022 |
| FTY50 Ltd | Administrative & support | 2025 |
| Fuel Centre Limited | Wholesale & retail | 2003 |
| Fuel-It Ltd | Extraterritorial | 2012 |
| Fulleylove Homes Ltd | Real estate | 2025 |
| Fulleylove Properties Ltd | Real estate | 2020 |
| Furlong Land Limited | Professional & scientific | 2017 |