| Express Remote Sensing Limited | Professional & scientific | 2023 |
| EYE Magazine Limited | Information & communication | 2008 |
| EZ Productions Limited | Information & communication | 2015 |
| F & R Restaurants Chelsea Limited | Hospitality | 2020 |
| F 4 F Limited | Health & social care | 2003 |
| F Yeoman Limited | Professional & scientific | 2025 |
| F-Secure (UK) Ltd | Information & communication | 1999 |
| F2 Private Investments Limited | Financial services | 2018 |
| FAB Decorating Ltd | Other services | 2015 |
| Face Teeth Smile Amersham Ltd | Health & social care | 2025 |
| Face Teeth Smile Ltd | Health & social care | 2021 |
| Fagan Construction Limited | Other services | 2018 |
| Fairbrook Consultants Ltd | Administrative & support | 2025 |
| Fairfield Fencing & Landscaping Ltd | Administrative & support | 2025 |
| Fairthorne 100 Limited | Construction | 2019 |
| Faith Spa Beauty Ltd | Other services | 2022 |
| Fake IT Hair and Nails Chalfont ST Peter Ltd | Other services | 2023 |
| Falcon Express Scaffolding London Limited | Administrative & support | 2016 |
| Famcap Limited | Real estate | 2024 |
| Fampharm Limited | Wholesale & retail | 2018 |
| Fampharm Luton Limited | Wholesale & retail | 2025 |
| Fantasygameday.App Limited | Information & communication | 2022 |
| Farah's Kitchen Ltd | Hospitality | 2022 |
| Farahi Ltd | Professional & scientific | 2025 |
| Farmers Place Residents Management Company Limited | Households | 2010 |
| Farndale Properties Holdings Ltd | Financial services | 2025 |
| Farndale Properties Ltd | Real estate | 2025 |
| Fast Forward Media Ltd | Information & communication | 2021 |
| Fbatribe Ltd | Wholesale & retail | 2020 |
| Feast of ST Peter Limited | Arts & recreation | 2009 |
| Felton Builders Limited | Construction | 2004 |
| Fennell Electrical Limited | Construction | 2020 |
| Ferrosteel Limited | Wholesale & retail | 2010 |
| Fever Tree Carpentry Ltd | Construction | 2023 |
| Field of Applications Ltd | Information & communication | 2025 |
| Field Sales Solutions Limited | Administrative & support | 2002 |
| Field Sales Solutions Tactical Limited | Professional & scientific | 2001 |
| Fieldology Limited | Information & communication | 2010 |
| Fields & Rudd Limited | Administrative & support | 2019 |
| Fifty-One Ltd | Manufacturing | 2017 |
| Fiftystars Limited | Wholesale & retail | 2018 |
| Fighter Town UK Limited | Hospitality | 2026 |
| Figure & Ground Communications Limited | Professional & scientific | 2015 |
| Filato UK Limited | Wholesale & retail | 2021 |
| Filia Properties Limited | Real estate | 2025 |
| Finance Data Solutions Ltd | Information & communication | 2009 |
| Financial Management Consulting Limited | Information & communication | 1998 |
| Fineland Forestry Limited | Agriculture & fishing | 2022 |
| Fiplab Limited | Information & communication | 2009 |
| Firs END Management Limited | Households | 2017 |
| First Financial Solutions LLP | | 2003 |
| First Place Care Limited | Administrative & support | 2018 |
| Fit Once Ltd | Wholesale & retail | 2020 |
| Fitzleroi Investment Partners Limited | Real estate | 2025 |
| Five Star Fabrics Limited | Wholesale & retail | 2003 |
| FJP Building Limited | Other services | 2018 |
| FK Restaurants Limited | Hospitality | 2020 |
| Flexible Minds Ltd | Health & social care | 2021 |
| Flooring Trade Sales Holdings Limited | Financial services | 2017 |
| Flooring Trade Sales Limited | Construction | 2003 |
| Fluid Solutions (Europe) Limited | Wholesale & retail | 2002 |
| Flygo Travel Ltd | Administrative & support | 2025 |
| Flying Colours North West London Limited | Wholesale & retail | 2018 |
| Folio Consultancy Ltd | Professional & scientific | 2022 |
| Fontana Developments Limited | Real estate | 1982 |
| Fonthill Holdings Limited | Financial services | 2019 |
| Food Fabulous Limited | Health & social care | 2014 |
| Force FX Limited | Information & communication | 2011 |
| Forcola Holdings Limited | Financial services | 2025 |
| Fordal Ltd. | Real estate | 2026 |
| Fordent Properties Limited | Health & social care | 1975 |
| Forestfact Ltd | Agriculture & fishing | 2023 |
| Forever Thai Ltd | Hospitality | 2025 |
| Formation Business Consulting Ltd | Administrative & support | 2020 |
| Formstrong Ltd | Information & communication | 2013 |
| Forsteel Limited | Manufacturing | 1989 |
| Fortis Egregius Limited | Wholesale & retail | 2013 |
| Forward Quality Solutions Ltd | Professional & scientific | 2022 |
| Foster and Co Heating Ltd | Construction | 2018 |
| Foster Art Design Ltd | Professional & scientific | 2007 |
| Fourpoints (London) UK Limited | Transport & logistics | 2019 |
| Fourteeneight Ltd | Professional & scientific | 2025 |
| FOX Lennox Limited | Professional & scientific | 2023 |
| FOX Virtual Assistants Ltd | Administrative & support | 2018 |
| Foxgloves (Howards Wood Drive) Management Company Limited | Households | 2002 |
| Foxhollow Digital Ltd | Professional & scientific | 2024 |
| FP Developers Ltd | Construction | 2020 |
| Frances Hannon Limited | Information & communication | 2011 |
| Freeman,Grieve Limited | Wholesale & retail | 1941 |
| Freewheel Media Limited | Other services | 2007 |
| Fresh and Tasty Catering Ltd | Hospitality | 2019 |
| Fresh Ready Meals Limited | Real estate | 2022 |
| Freshway Limited | Real estate | 1984 |
| Fritto Misto Limited | Hospitality | 2017 |
| FSM Technology Ltd | Information & communication | 2026 |
| Furnishfinish Limited | Manufacturing | 2023 |
| Future DP Limited | Professional & scientific | 2012 |
| Fuzed Supplements Ltd | Wholesale & retail | 2022 |
| Fynara LLP | | 2025 |
| G Squared Diagnostics Ltd | Health & social care | 2023 |