| Filip Building Ltd | Construction | 2022 |
| Filipino Academy Professional Specialization Limited | Education | 2019 |
| Filisteen Distribution Limited | Administrative & support | 2010 |
| Filisteen Holdings Limited | Professional & scientific | 2018 |
| Fill Mill Ltd | Construction | 2018 |
| Fillyourflat.Co.Uk Limited | Other services | 2014 |
| Film Guard Security Ltd | Wholesale & retail | 2025 |
| Film Producers of UK Limited | Information & communication | 2022 |
| Film the Agency Ltd | Information & communication | 2022 |
| FILM24 Limited | Information & communication | 2024 |
| Filmriggers Ltd | Other services | 2019 |
| Filoksenia House Limited | Hospitality | 2026 |
| Final Touch Construction Ltd | Construction | 2018 |
| Final Touch Global Limited | Construction | 2009 |
| Finance Consultants Ltd | Financial services | 2021 |
| Finance Systems and Data Solutions Limited | Financial services | 2021 |
| Financial Consultants & Services Ltd. | Professional & scientific | 2015 |
| Financial Consultants Limited | Professional & scientific | 2019 |
| Finatech Planet Ltd | Real estate | 2020 |
| Finaxial Hub Limited | Other services | 2019 |
| Finch Calder Limited | Information & communication | 2023 |
| Finchley Management Limited | Real estate | 2016 |
| Finchley Property Lettings Limited | Real estate | 2023 |
| Finchmoor Harlow Ltd | Real estate | 2025 |
| Finco 1 Limited | Financial services | 2026 |
| Finconstruct Plus Ltd | Construction | 2024 |
| Fincontext Ltd | Professional & scientific | 2023 |
| Fincortec Consulting Limited | Professional & scientific | 2024 |
| Find a DPP Ltd | Health & social care | 2025 |
| Find a Learner CIC | Other services | 2013 |
| Find and Update Ltd | Extraterritorial | 2024 |
| Findex Ltd | Information & communication | 2011 |
| Finding OUT Limited | Information & communication | 2025 |
| Fine Futures Limited | Health & social care | 2010 |
| Fine Indian Dining Limited | Hospitality | 2019 |
| Fine Lines (UK) Limited | Wholesale & retail | 2004 |
| Fine MED Food Limited | Hospitality | 2008 |
| Fine Shading UK Ltd | Wholesale & retail | 2021 |
| Fine Words Ltd | Professional & scientific | 2025 |
| Fine&Fair Limited | Wholesale & retail | 2022 |
| Finefair Asset Management Ltd | Financial services | 2015 |
| Finefair Limited | Real estate | 2003 |
| Finefair Management Limited | Real estate | 2000 |
| Finepix Productions Ltd | Transport & logistics | 2005 |
| Fineq Books Ltd | Professional & scientific | 2021 |
| Finesmith Bullion Ltd | Water & waste | 2019 |
| Finesmith Eco Ltd | Water & waste | 2025 |
| Finesmith Ltd | Wholesale & retail | 2025 |
| Finesmith Refinery Ltd | Manufacturing | 2025 |
| Finesse Detailing Ltd | Wholesale & retail | 2025 |
| Finesse Gold Ltd | Financial services | 2023 |
| Finest Event Managements Ltd | Hospitality | 2025 |
| Finformax Solutions Limited | Information & communication | 2025 |
| Finishing Touches London Limited | Wholesale & retail | 2010 |
| Finna Properties Ltd | Real estate | 2024 |
| Finoil Refining Global Co. Ltd | Manufacturing | 2025 |
| Finqua Ltd | Information & communication | 2011 |
| Finsbury Property Limited | Real estate | 2025 |
| Finstrad Ltd | Professional & scientific | 2026 |
| Fintech Advisory Partners Ltd | Administrative & support | 2024 |
| Fintrix Ltd | Wholesale & retail | 2026 |
| Finyard Limited | Extraterritorial | 2019 |
| Fire EAT Ltd | Hospitality | 2026 |
| Fire Food Bites Ltd | Hospitality | 2026 |
| Fire Plus Security Ltd | Administrative & support | 2017 |
| Fire Wise Solutions Ltd | Construction | 2019 |
| Firebrand Research Limited | Information & communication | 2020 |
| Firecracker Iscene Limited | Hospitality | 2019 |
| Firehose.Ai Ltd | Wholesale & retail | 2025 |
| Firestone Building Services Ltd | Construction | 2025 |
| Firetex Limited | Construction | 2008 |
| Firex Solutions Limited | Construction | 2023 |
| Firm Construction Services Ltd | Transport & logistics | 2026 |
| Firman Close Management Company Limited | Households | 2008 |
| Firmpet Ltd | Administrative & support | 2022 |
| Firmtech Ltd | Information & communication | 2023 |
| Firnas.Tech Ltd | Transport & logistics | 2024 |
| Firoxen Limited | Wholesale & retail | 2025 |
| First & Next Mortgages Limited | Financial services | 2026 |
| First 5 Properties Limited | Real estate | 2022 |
| First Associates Ltd | Real estate | 2026 |
| First Best Group Ltd | Administrative & support | 2025 |
| First Capital Homes Ltd | Real estate | 2010 |
| First Car Services Limited | Transport & logistics | 2024 |
| First Care Physiotherapy and Sports Clinic Ltd | Health & social care | 2023 |
| First Cart Ltd | Information & communication | 2016 |
| First Choice (Roydon) Limited | Construction | 2023 |
| First Choice Fencing Ltd | Wholesale & retail | 2017 |
| First Choice Maintenance 24/7 Limited | Construction | 2025 |
| First Choice Motors U.K Ltd | Wholesale & retail | 2019 |
| First Class Guarding Ltd | Administrative & support | 2023 |
| First Contact Construction Limited | Construction | 2023 |
| First Contact Consultancy Ltd | Professional & scientific | 2014 |
| First Day Holdings Ltd | Financial services | 2023 |
| First Day Nursery Green Lane Ltd | Administrative & support | 1998 |
| First Day Nursery Hillside Ltd | Health & social care | 2020 |
| First Day Nursery Ltd | Education | 2015 |
| First Drive Auto Ltd | Wholesale & retail | 2025 |
| First European Recruitment Limited | Administrative & support | 2023 |
| First Hvac Services UK Ltd | Construction | 2025 |