| FC Wine Limited | Construction | 2023 |
| Fclh Ltd | Financial services | 2020 |
| FD Civil Engineering Limited | Construction | 2016 |
| FDC Limited | Real estate | 1936 |
| FDR Delaware Holdings Limited | Professional & scientific | 2018 |
| FDR Pension Scheme Trustee Limited | Other services | 2018 |
| FDR U.K. Limited | Financial services | 1987 |
| Feather Inns Ltd | Hospitality | 2023 |
| Federal Housing Ltd | Real estate | 2016 |
| Fedex Cross Border (UK) Limited | Transport & logistics | 2008 |
| Feelgood Community Health & Fitness CIC | Health & social care | 2023 |
| Feelgood Fitness Ltd | Arts & recreation | 2018 |
| Felisa Cleaning Service Ltd | Administrative & support | 2026 |
| Felix Design & Build Limited | Construction | 2014 |
| Felixdb Developments Limited | Professional & scientific | 2021 |
| Fellini's Dolce Vita Limited | Hospitality | 2018 |
| Femspire Solutions Limited | Professional & scientific | 2026 |
| Fenix Custom Build Limited | Construction | 2025 |
| Fenora Baltic Ltd | Construction | 2025 |
| Feolab Limited | Administrative & support | 2018 |
| Ferenc Gyalus Limited | Health & social care | 2016 |
| Feride Home Trading Limited | Wholesale & retail | 2025 |
| Fermento Pizzeria Limited | Hospitality | 2024 |
| Ferrers Electrical Services Limited | Construction | 2017 |
| Festival Way Management Company Limited | Real estate | 2022 |
| Fezco Ltd | Transport & logistics | 2018 |
| FFA Consulting Limited | Professional & scientific | 2019 |
| FH Auto Services Ltd | Professional & scientific | 2023 |
| Fiad Construct Ltd | Construction | 2018 |
| Fidus Capital Limited | Financial services | 2022 |
| Field's Menswear Limited | Wholesale & retail | 1975 |
| Figtrad Limited | Transport & logistics | 2026 |
| Fiig Invest UK Ltd | Wholesale & retail | 2025 |
| Filipino Care Givers Ltd | Health & social care | 2018 |
| Film Crew Transport Ltd | Transport & logistics | 2026 |
| Finaker Finance Limited | Financial services | 2016 |
| Finance Hub Ltd | Financial services | 2019 |
| Finance One Vehicle Solutions Limited | Financial services | 2009 |
| Financial Pro Accounting Ltd | Professional & scientific | 2023 |
| Find Platforms Ltd | Information & communication | 2026 |
| Findrest Ltd | Real estate | 2026 |
| Fine Detail Inventory Company Limited | Real estate | 2016 |
| Finelink Installations Limited | Manufacturing | 1997 |
| Finelink Properties Limited | Real estate | 2019 |
| Finesse Building Services Ltd | Construction | 2003 |
| Finesse Stone Ltd | Professional & scientific | 2020 |
| Finrec Ltd | Information & communication | 2020 |
| Fintaxology Limited | Financial services | 2025 |
| Finu Property Management Ltd | Real estate | 2023 |
| Fire and Wolf Ltd | Wholesale & retail | 2021 |
| Fire Defence Group Ltd | Public administration | 2025 |
| Firegenie Solutions Ltd | Professional & scientific | 2013 |
| Firesafe Systems Ltd | Construction | 2018 |
| Firmus Electrical Contractors Limited | Construction | 2023 |
| First Class Cleaning M.A Ltd | Administrative & support | 2024 |
| First Class Cleaning Management Ltd | Administrative & support | 2020 |
| First Clinical Aesthetics Limited | Health & social care | 2016 |
| First Data Europe Limited | Financial services | 1986 |
| First Data UK Holdings Limited | Professional & scientific | 2018 |
| First Digits Ltd | Health & social care | 2023 |
| First Envisaged Ltd | Professional & scientific | 2022 |
| First Facilities Support Ltd | Administrative & support | 2020 |
| First FIX Drylining Limited | Construction | 2004 |
| First for Safety Training Limited | Administrative & support | 2008 |
| First Merchant Processing (UK) Limited | Professional & scientific | 2021 |
| First Ojala UK Limited | Information & communication | 2019 |
| First Response Tree Surgeons Ltd | Administrative & support | 2025 |
| First Steps Day Nursery (B&H) Limited | Education | 2013 |
| Firstrate Quality Services Ltd | Health & social care | 2025 |
| Fiserv (Europe) Limited | Information & communication | 1990 |
| Fish & Chips (Basildon) Limited | Hospitality | 2018 |
| Fish 'N' Chick'N Limited | Hospitality | 1971 |
| Fisk & Osborne Building Ltd | Construction | 2018 |
| Fit Performance Ltd | Arts & recreation | 2013 |
| Fit Studioz Limited | Arts & recreation | 2019 |
| Fitn LDN Limited | Wholesale & retail | 2026 |
| Fitter Body Ladies Basildon Ltd | Arts & recreation | 2018 |
| Five J Properties Ltd | Real estate | 2019 |
| Five Touring LLP | | 2013 |
| Fixerdry Limited | Construction | 2022 |
| Fizz List Limited | Administrative & support | 2022 |
| FJB Solutions Ltd | Information & communication | 2025 |
| FJJ Childcare Ltd | Health & social care | 2025 |
| FJR Capital Ltd | Financial services | 2022 |
| FKB Investments Limited | Real estate | 2023 |
| Flagship Plumbing & Heating Limited | Construction | 2021 |
| Flair Interiors (Essex) Limited | Construction | 1998 |
| Flame Force Limited | Construction | 2010 |
| Flangeguards Limited | Manufacturing | 2006 |
| Flat Pack Professionals Limited | Other services | 2022 |
| Flat White Real Estate Ltd | Wholesale & retail | 2024 |
| Flavour FIX Ltd | Hospitality | 2025 |
| Fleetwood BAC Merch Limited | Wholesale & retail | 2026 |
| Fleros Limited | Wholesale & retail | 2024 |
| Flexi Recruitment Limited | Administrative & support | 2021 |
| Flint Plaza Limited | Arts & recreation | 2022 |
| Flite Consulting Limited | Professional & scientific | 2025 |
| Flofast Service Ltd | Construction | 2014 |
| Floglass Limited | Wholesale & retail | 2014 |
| Floodgate Solutions Ltd | Administrative & support | 2016 |