| Field & Forest Limited | Agriculture & fishing | 1998 |
| Field House CP Ltd | Professional & scientific | 2022 |
| Field Meadow Ltd | Professional & scientific | 2021 |
| Field of Equitation Ltd | Professional & scientific | 2014 |
| Field Rise 2009 Limited | Financial services | 2010 |
| Fieldrise Construction Ltd | Construction | 2018 |
| FIFTEEN2 Ltd | Real estate | 2010 |
| Figheldean Manor Limited | Health & social care | 2016 |
| Fight City CIC | Arts & recreation | 2025 |
| Fileri Co. Limited | Other services | 2017 |
| Filip Trade Limited | Transport & logistics | 2025 |
| Filipiuk Robotics Services Ltd | Professional & scientific | 2019 |
| Fillerz Ltd | Hospitality | 2021 |
| Film Optics Ltd | Manufacturing | 2013 |
| Film Sound Consultant Limited | Professional & scientific | 2016 |
| Fimzo Ltd | Wholesale & retail | 2021 |
| Final Destination Carrier Ltd | Transport & logistics | 2022 |
| Financial Seminars Ltd | Professional & scientific | 2009 |
| Finaqore Limited | Information & communication | 2019 |
| Finchdale Holdings Ltd | Real estate | 2020 |
| Find My Stuff UK Ltd | Information & communication | 2026 |
| Findaspare Ltd | Wholesale & retail | 2016 |
| Finds N Fits Ltd | Wholesale & retail | 2025 |
| Fine POT Services Limited | Hospitality | 2019 |
| Finishadapt Limited | Information & communication | 1993 |
| Finity Consulting Ltd | Professional & scientific | 2020 |
| Finnygook Holdings Ltd | Financial services | 2019 |
| Fiona @ Salon Hair Design Limited | Other services | 2014 |
| Fiona Scott Media Consultancy Limited | Information & communication | 2013 |
| Fiorentini Arts School Limited | Arts & recreation | 2008 |
| Firat Construction Limited | Construction | 2018 |
| Firbolg Mechanical and Plumbing Ltd | Construction | 2016 |
| Fire Suppression (Holdings) Limited | Financial services | 2013 |
| Fire Suppression Maintenance Limited | Extraterritorial | 2013 |
| Fire Suppression Systems Limited | Extraterritorial | 2013 |
| Fireball Designs Ltd | Hospitality | 2021 |
| Firemb Ltd | Wholesale & retail | 2023 |
| Firmpass HSE and Sustainability Ltd | Professional & scientific | 2026 |
| First Call Care Services Limited | Administrative & support | 2017 |
| First Call Rigging Limited | Arts & recreation | 2019 |
| First Care Specialists Ltd | Health & social care | 2021 |
| First City Group Limited | Health & social care | 2006 |
| First City Home Care Limited | Health & social care | 2006 |
| First City Training Ltd | Education | 2020 |
| First Class Automotive Repairs Limited | Transport & logistics | 2006 |
| First Class Services Automotive Ltd | Wholesale & retail | 2024 |
| First Fruits Property Limited | Construction | 2025 |
| First Light Collective Ltd | Information & communication | 2026 |
| First Start Developments Limited | Professional & scientific | 2006 |
| First Stone Corporation Ltd | Construction | 2020 |
| Firstangle Limited | Information & communication | 2021 |
| Firstimpressionscleaning Ltd | Administrative & support | 2018 |
| Fiscal Business Services Ltd | Financial services | 2008 |
| Fish Brothers Group (Holdings) Limited | Wholesale & retail | 2024 |
| Fish Brothers Property Company Limited | Real estate | 2015 |
| Fish Brothers Property Investment LLP | | 2009 |
| Fish Stop Swindon Ltd | Hospitality | 2025 |
| Fisher & SON Roofing Limited | Construction | 2020 |
| Fisher Electrical Ltd | Construction | 2026 |
| Fishing Ticket .COM Ltd | Information & communication | 2019 |
| Fistral Lodge 102 Limited | Hospitality | 2024 |
| Fit 4 Purpose Finance Ltd. | Administrative & support | 2011 |
| Fit My Doors Ltd | Construction | 2025 |
| Fitchett Construction Ltd | Construction | 2026 |
| Fitila Connections UK Ltd | Information & communication | 2025 |
| Fitness Formula Stet Ltd | Arts & recreation | 2022 |
| Fittofly Data Ltd | Information & communication | 2021 |
| Fitzgibbon Property Sales Ltd | Real estate | 2017 |
| Fitzwarren Homes Limited | Construction | 2016 |
| Five Bay Leisure Ltd | Hospitality | 2021 |
| Five Estuaries Offshore Wind Farm Limited | Construction | 2019 |
| Five Rivers Consultancy Limited | Professional & scientific | 2011 |
| Five Sixty-Six Ltd | Real estate | 2011 |
| Five Star Paving Ltd | Other services | 2017 |
| Five Star Security (Swindon) Limited | Administrative & support | 2004 |
| Five Summers HR Ltd | Professional & scientific | 2018 |
| Fiveheads Films Ltd | Information & communication | 2016 |
| FIX Gym Limited | Other services | 2022 |
| FIX4LESS Ltd | Wholesale & retail | 2026 |
| Fixacar Limited | Wholesale & retail | 2015 |
| Fiyok Limited | Wholesale & retail | 2025 |
| Fiyok Medicare Limited | Health & social care | 2012 |
| FJM Swim LLP | | 2024 |
| FK Agyapong Limited | Health & social care | 2022 |
| FK Takeaways Ltd | Hospitality | 2025 |
| FL Global Ltd | Wholesale & retail | 2015 |
| Flambards Limited | Professional & scientific | 2024 |
| Flamelilly Anaesthetic Services Ltd | Health & social care | 2023 |
| Flatweave Installations Limited | Construction | 2023 |
| Flaunt Hairdressing Ltd | Other services | 2007 |
| Flavoursmith Ltd | Hospitality | 2024 |
| Flawless Floors Outlet Ltd | Wholesale & retail | 2024 |
| Flawless Property Maintenance Ltd | Construction | 2025 |
| Flawlessfloorsuk Ltd | Wholesale & retail | 2024 |
| Flaxlands Consulting Limited | Information & communication | 2010 |
| Flaxlands Management Limited | Professional & scientific | 2003 |
| Flaxlands Wood Farm Limited | Real estate | 2005 |
| Fleet Street Property Ltd | Construction | 2020 |
| Fleetcor Fuel Cards Europe Limited | Wholesale & retail | 1986 |
| Fleetcor UK Acquisition Limited | Professional & scientific | 2006 |