| Fagioli Limited | Construction | 1990 |
| Faimic Ltd | Hospitality | 2022 |
| Fair Deal Environmental Services Ltd | Administrative & support | 2025 |
| Fair Deal Pest Control Ltd | Administrative & support | 2023 |
| Fairchild UK Recruitment Limited | Administrative & support | 2007 |
| Fairfield Cases Limited | Manufacturing | 2008 |
| Fairfield Court (Ruislip) Limited | Professional & scientific | 2007 |
| Fairfield Developments (UK) Ltd | Construction | 2007 |
| Fairfield House Investments Ltd | Real estate | 2025 |
| Fairfield Housing UK Ltd | Real estate | 2021 |
| Fairhall Ventures Limited | Administrative & support | 2014 |
| Fairweather (Topsham) Limited | Wholesale & retail | 1946 |
| Fairwish Limited | Agriculture & fishing | 1996 |
| Faith Developers Ltd | Real estate | 2023 |
| Fakhraali Ltd | Wholesale & retail | 2025 |
| Falah Academy Limited | Education | 2018 |
| Falak M Counselling Services Ltd | Professional & scientific | 2023 |
| Falcon Automotive Ltd | Wholesale & retail | 2021 |
| FAM Dent Ltd | Health & social care | 2024 |
| FAM Luxury Limited | Transport & logistics | 2024 |
| Family Close Limited | Households | 1990 |
| Fanray Services Ltd | Construction | 2022 |
| Fantasia Cruise Limited | Transport & logistics | 2023 |
| Fantasy Content Ltd | Information & communication | 2024 |
| Farah Cars Limited | Administrative & support | 2018 |
| Farborn Limited | Financial services | 2026 |
| Faris 05 Limited | Wholesale & retail | 2010 |
| Farmakia Ltd | Wholesale & retail | 2019 |
| Farman Limited | Transport & logistics | 2017 |
| Farmfix Investment UK Ltd | Wholesale & retail | 2024 |
| Farmhouse Meats Limited | Manufacturing | 2001 |
| Farnpoint Limited | Real estate | 1997 |
| Farns Services Ltd | Professional & scientific | 2019 |
| Farringdon & Farringdon Ltd | Real estate | 2023 |
| Farringdon Electrical Ltd | Construction | 2019 |
| Farringdon Group Ltd | Construction | 2021 |
| Farrow House Limited | Health & social care | 1998 |
| Fars Medical Ltd | Health & social care | 2022 |
| Fast CCR Ltd | Transport & logistics | 2020 |
| Fast FOOD1 Ltd | Hospitality | 2025 |
| Fast Lane Carcare Limited | Wholesale & retail | 2010 |
| Fast Lane Prestige Ltd | Wholesale & retail | 2015 |
| Fast Track Success Ltd | Administrative & support | 2018 |
| Fastnaparts Limited | Professional & scientific | 1978 |
| Fastpark Ltd | Other services | 2011 |
| Fastrack Properties Limited | Real estate | 2024 |
| Fasttrack Pro Ltd | Education | 2025 |
| Fastway Landscapes Ltd | Construction | 2026 |
| Fateh Investments Limited | Real estate | 2017 |
| Fateh Logistics Ltd | Transport & logistics | 2026 |
| Fatima Gulied Photography Ltd | Professional & scientific | 2019 |
| FAZ Auto Repairs Ltd | Wholesale & retail | 2021 |
| FB Decoration & Property Maintenance Limited | Construction | 2019 |
| FBG RCD Ltd | Financial services | 2020 |
| FCK Design Ltd | Professional & scientific | 2025 |
| FD Signs Limited | Manufacturing | 2013 |
| FDT Consultants Ltd | Real estate | 2014 |
| Fearghal Wilson Engineering Ltd | Construction | 2021 |
| Feastbeast Limited | Hospitality | 2023 |
| Feature Company Ventures Ltd | Wholesale & retail | 2025 |
| Fecund Integrated Services Ltd | Administrative & support | 2026 |
| Felix 7 Limited | Construction | 2018 |
| Felix Noir Limited | Administrative & support | 2026 |
| Fent Plates Ltd | Wholesale & retail | 2023 |
| Fents Electrical Ltd | Construction | 2011 |
| Fern Vision Productions Ltd | Information & communication | 2021 |
| Fernlock Limited | Real estate | 1996 |
| Fernznest Ltd | Wholesale & retail | 2025 |
| Fero Nova Flooring Limited | Construction | 2017 |
| Ferocious Talent Limited | Administrative & support | 2013 |
| Ferret Network Limited | Information & communication | 2024 |
| Fervour Solutions Limited | Information & communication | 2016 |
| Feyzz Property Limited | Real estate | 2025 |
| FF Gold Ltd | Wholesale & retail | 2020 |
| FH Estates and Lettings Limited | Real estate | 2024 |
| FI Recruits Ltd | Administrative & support | 2022 |
| Fieldview Property Investments Ltd | Real estate | 2025 |
| FIK Limited | Wholesale & retail | 2018 |
| Fikiclean Limited | Administrative & support | 2016 |
| Filipe Silva Landscaping Ltd | Administrative & support | 2022 |
| Film & TV Catering Solutions Ltd | Hospitality | 2026 |
| Film Fuels (UK) Limited | Wholesale & retail | 2021 |
| Film Medical Services Limited | Arts & recreation | 1990 |
| Film Studios Solutions Ltd | Administrative & support | 2024 |
| Filmsets Ltd | Construction | 2025 |
| Fina Ltd | Professional & scientific | 2025 |
| Finance in Brief Ltd | Information & communication | 2026 |
| Find Loads Ltd | Transport & logistics | 2025 |
| Fine Collection Ltd | Wholesale & retail | 2025 |
| Fine Deco Builders Limited | Construction | 2026 |
| Fine Drams Ltd | Wholesale & retail | 2020 |
| Fine Food & Wine Store Ltd | Wholesale & retail | 2011 |
| Fine Group Limited | Professional & scientific | 2005 |
| Fine Products Limited | Financial services | 2001 |
| Fingers AS Pins Ltd | Manufacturing | 2025 |
| Fins Feather N'Fur Limited | Transport & logistics | 1998 |
| Fintaxuk Solutions Ltd | Professional & scientific | 2025 |
| Fire & Flavour Hubs Ltd | Hospitality | 2025 |
| Fire Door Installers UK Ltd | Construction | 2025 |
| Firm Vehicle Solutions Limited | Wholesale & retail | 2014 |