| Fairdeal Enterprises Limited | Real estate | 2016 |
| Fairdeal Supermarket Limited | Wholesale & retail | 2010 |
| Fairluxe Homes Ltd | Construction | 2016 |
| Fairmount London Limited | Real estate | 2023 |
| Fairytale London Ltd | Other services | 2026 |
| Faisal Healthcare Limited | Health & social care | 2010 |
| Faisal Real Estate Limited | Real estate | 2024 |
| Faith Unity Discipline CIC | Education | 2023 |
| Falcon AAS Construction Supplies Ltd | Wholesale & retail | 2025 |
| Falcon Car Rentals Ltd | Wholesale & retail | 2018 |
| Falcon Data Analytics Ltd | Real estate | 2018 |
| Falcon Road Ltd | Real estate | 2021 |
| FAM Sky Limited | Health & social care | 2020 |
| Fame Distribution Ltd | Construction | 2025 |
| Family Foundations First Ltd | Health & social care | 2023 |
| Fammes 1 Limited | Real estate | 2023 |
| Fammes Holds Limited | Financial services | 2024 |
| Famous PVT Ltd | Hospitality | 2026 |
| Famrise Ltd | Wholesale & retail | 2025 |
| FAN Trading Ltd | Transport & logistics | 2019 |
| Fanah Trading Ltd | Transport & logistics | 2023 |
| Fanaka Express Ltd | Real estate | 2024 |
| Fantastic Nails Limited | Other services | 2014 |
| Farah Dibah Properties Ltd | Real estate | 2021 |
| Farah Medics Ltd | Health & social care | 2023 |
| Faris Properties Ltd | Real estate | 2017 |
| Faris Trading Ltd | Wholesale & retail | 2014 |
| Farnham Accountants Ltd | Professional & scientific | 2021 |
| Faro Trading Ltd | Transport & logistics | 2018 |
| Farro Constructions Limited | Construction | 2013 |
| Fashion Vision Ltd | Wholesale & retail | 2020 |
| Fast & Fast Delivery Ltd | Transport & logistics | 2020 |
| Fast & Frosted Ltd | Hospitality | 2025 |
| Fast Recovery Services London Limited | Wholesale & retail | 2016 |
| Fast Tax Services Ltd | Professional & scientific | 2015 |
| Fast Track Management (UK) Limited | Wholesale & retail | 2000 |
| Fastdrive Movers Ltd | Wholesale & retail | 2024 |
| Faulkner Management Limited | Financial services | 2016 |
| Favoured Health Care Agency Ltd | Health & social care | 2017 |
| Favoured Health Care CIC | Health & social care | 2011 |
| Fazcons Ltd | Construction | 2016 |
| Fazmaz Holdings Ltd | Financial services | 2026 |
| Fazmaz Property Investment Ltd | Real estate | 2026 |
| FC Playbook Limited | Administrative & support | 2024 |
| FCH Serv Ltd | Other services | 2025 |
| Feea Ltd | Professional & scientific | 2025 |
| FEM PVT Ltd | Wholesale & retail | 2020 |
| Fentons Ice Cream Limited | Hospitality | 2010 |
| Fern UK Limited | Other services | 2007 |
| Feroz Visa Consultancy Ltd | Information & communication | 2024 |
| Ferryton Builders Ltd | Construction | 2025 |
| Ffsb Ltd | Real estate | 2021 |
| Ffsk Property Investment Ltd | Real estate | 2024 |
| FIG Wellbeing Pilates Limited | Wholesale & retail | 2025 |
| Filerange Limited | Wholesale & retail | 1979 |
| Finasolve Limited | Administrative & support | 2017 |
| Finch UK Trading Ltd | Transport & logistics | 2021 |
| Finchley Padel Limited | Wholesale & retail | 2025 |
| Finest Merchant Limited | Wholesale & retail | 2018 |
| Finmod Ltd | Administrative & support | 2020 |
| Finnegan Prescribe Service Ltd | Health & social care | 2026 |
| Finni One Ltd | Wholesale & retail | 2024 |
| Finsoulnetwork Ltd | Information & communication | 2025 |
| Fiona Sainz Ltd | Professional & scientific | 2025 |
| Fire Box Security & Safety Equip Limited | Wholesale & retail | 2024 |
| Fireman 112 Ltd | Energy | 2019 |
| First Class Cars Ltd | Wholesale & retail | 2020 |
| First Direct Recruitment Limited | Administrative & support | 2008 |
| First Properties Group Ltd | Households | 2019 |
| First UK Trader Ltd | Wholesale & retail | 2020 |
| Fishlings Limited | Professional & scientific | 2015 |
| Fistro Limited | Wholesale & retail | 2018 |
| Fistrology Limited | Wholesale & retail | 2024 |
| FIT2 Ltd | Education | 2022 |
| Fitpro International Ltd | Wholesale & retail | 2020 |
| Fittout Group Ltd | Construction | 2024 |
| Fitvers Ltd | Wholesale & retail | 2025 |
| Five Pillars Group Ltd | Real estate | 2026 |
| FIX My Build Ltd | Information & communication | 2022 |
| Fix-A-Frame Limited | Wholesale & retail | 1984 |
| Fixerd Ltd | Manufacturing | 2020 |
| Fixgadgets Ltd | Other services | 2016 |
| Fixit Computers UK Limited | Extraterritorial | 2009 |
| FJ Transport Limited | Transport & logistics | 2022 |
| FJD Trading Ltd | Transport & logistics | 2024 |
| FKS Services Limited | Health & social care | 2023 |
| Flaming Grate Heating Limited | Construction | 2006 |
| Flaming Grate Holdings Limited | Financial services | 2017 |
| Flaming Grate Properties Limited | Real estate | 2017 |
| Flasgames Ltd | Information & communication | 2020 |
| Flash Express Limited | Transport & logistics | 2019 |
| Flash London Limited | Transport & logistics | 2021 |
| Flastech Ltd | Information & communication | 2014 |
| FLC Insurance Services Limited | Financial services | 2002 |
| Fleet Flex Rentals Ltd | Transport & logistics | 2025 |
| Fletcher Poole Ltd | Information & communication | 2020 |
| Flex FM Radio Limited | Information & communication | 2016 |
| Flex Media Ltd | Real estate | 2021 |
| Flights Shops Limited | Administrative & support | 2024 |
| Flintstone Motors Ltd | Wholesale & retail | 2014 |