| Forest Homes Development Limited | Construction | 2009 |
| Forest Marine and Joinery Ltd | Manufacturing | 2021 |
| Forest Motor Repairs Ltd | Wholesale & retail | 2025 |
| Forest Pizza Ltd | Hospitality | 2025 |
| Forest Plumbing & Heating Limited | Construction | 2014 |
| Forest Style Eyecare Limited | Wholesale & retail | 2014 |
| Forest View Landscapes Ltd | Administrative & support | 2024 |
| Forest View Titchfield Limited | Construction | 2022 |
| Foresters General Insurance Services Limited | Financial services | 1997 |
| Foresters Pension Scheme Trustees Limited | Administrative & support | 2010 |
| Forestsett Property Investments Ltd | Construction | 2025 |
| Forestside Construction Limited | Construction | 2005 |
| Forever- Always Care Ltd | Public administration | 2025 |
| Forge Genai Ltd | Information & communication | 2026 |
| Forge Mount Limited | Professional & scientific | 2020 |
| Forged Systems Ltd | Information & communication | 2025 |
| Forged Wellness Limited | Manufacturing | 2026 |
| Forgeside Property Management RTM Company Limited | Households | 2017 |
| Forget U NOT Ltd | Administrative & support | 2025 |
| Forget-Me-Not Publications Ltd. | Information & communication | 2005 |
| Forkids Transport Ltd | Transport & logistics | 2016 |
| Formhalls Vintage & Racing Limited | Manufacturing | 2001 |
| Formstone Management Ltd | Real estate | 2014 |
| Formula Scaffolding Holdings Limited | Financial services | 2021 |
| Formula Scaffolding Limited | Construction | 1996 |
| Forse Media Ltd | Information & communication | 2021 |
| Fort Caravan Park Ltd | Construction | 2018 |
| Fortalis Limited | Administrative & support | 2011 |
| Forte Pilates Limited | Arts & recreation | 2026 |
| Fortified Consults Ltd | Real estate | 2013 |
| Fortify Technologies Ltd. | Information & communication | 2024 |
| Fortis Build & Developments Limited | Real estate | 2019 |
| Fortis Fide Limited | Wholesale & retail | 2023 |
| Fortis Marine Limited | Wholesale & retail | 2014 |
| Fortitude Carpentry & Construction Ltd | Construction | 2024 |
| Fortitude Environmental Holdings Limited | Financial services | 2012 |
| Fortitude Environmental Limited | Water & waste | 2012 |
| Fortknoks Limited | Real estate | 2026 |
| Fortress Estate Management & Investment Ltd | Real estate | 2026 |
| Fortune Health Ltd | Health & social care | 2024 |
| Fortune PK Ltd | Wholesale & retail | 2026 |
| Forty Supply Company Limited | Manufacturing | 2019 |
| Forty Two Cranes Park (Surbiton) Limited | Households | 1973 |
| Forum Architecture Limited | Professional & scientific | 2013 |
| Forward Path Logistics Ltd | Transport & logistics | 2026 |
| Forward Securities Limited | Administrative & support | 2000 |
| Forward Thinking Psychology Limited | Health & social care | 2024 |
| Forwards Cycling Limited | Manufacturing | 2020 |
| Forwardvia Limited | Transport & logistics | 2018 |
| Forway Development Limited | Construction | 2016 |
| Foskett Medical Services Ltd | Health & social care | 2022 |
| Foulkes & Sons Ltd | Transport & logistics | 2004 |
| Foundry Media Limited | Information & communication | 2024 |
| Fountain (Hythe) Limited | Hospitality | 2019 |
| Fountain of Life Healthcare Ltd | Health & social care | 2017 |
| Four Barz Films (VS) Limited | Financial services | 2017 |
| Four Bears Property Limited | Real estate | 2016 |
| Four Dozen Limited | Health & social care | 2015 |
| Four Forge Properties Limited | Real estate | 2024 |
| Four in a ROW Ltd | Hospitality | 2023 |
| Four Leaf Cover Limited | Financial services | 2020 |
| Four Marks Decking Limited | Wholesale & retail | 2019 |
| Four Project Management Limited | Professional & scientific | 2022 |
| Four Twelve Homes Limited | Construction | 2020 |
| Four Twelve Investments Ltd | Real estate | 2021 |
| FOUR2 Records Ltd | Information & communication | 2022 |
| Fourthcoffee Limited | Professional & scientific | 2018 |
| Fourthman Engineering Services Ltd | Wholesale & retail | 2019 |
| Fourway Maritime Corporation (UK) Limited | Extraterritorial | 2014 |
| Fowler Brothers Carpentry Limited | Manufacturing | 2019 |
| FOX (Chain Saws) Limited | Wholesale & retail | 1975 |
| FOX Bishops Waltham Limited | Wholesale & retail | 1985 |
| FOX Bookkeeping & Accountancy Limited | Professional & scientific | 2013 |
| FOX Corner Limited | Other services | 2014 |
| FOX Hvac Ltd | Construction | 2018 |
| FOX Pickleball Ltd | Manufacturing | 2025 |
| Fox's Cleaning Services Limited | Administrative & support | 2005 |
| Foxhills Property Management Limited | Households | 2004 |
| Foxtec Auto Electrics Limited | Wholesale & retail | 2026 |
| Foxtec Services Ltd | Wholesale & retail | 2007 |
| Foxwood Creative Ltd | Wholesale & retail | 2022 |
| Foxwood Self Storage Limited | Other services | 2022 |
| FP Harris Ltd | Wholesale & retail | 2022 |
| FPN Limited | Professional & scientific | 1995 |
| FPZ UK Limited | Manufacturing | 2004 |
| FR Investment Property Limited | Real estate | 2021 |
| FR Leasehold Properties Limited | Real estate | 2025 |
| FR Medical Services Ltd | Health & social care | 2016 |
| FR Renting and More Ltd | Real estate | 2023 |
| Fractal Leadership Ltd | Professional & scientific | 2014 |
| Frada Ltd | Hospitality | 2019 |
| Frades Ltd. | Real estate | 2019 |
| Framax (UK) Limited | Professional & scientific | 2008 |
| Frame Appointments Ltd | Administrative & support | 2015 |
| Frame Personnel Ltd | Administrative & support | 2015 |
| Frame Recruitment Ltd | Administrative & support | 2015 |
| Frame Search and Selection Ltd | Administrative & support | 2015 |
| Frame-A-Game Limited | Wholesale & retail | 2023 |
| France Export Services UK Limited | Wholesale & retail | 2002 |
| Francis and Co Decorating Limited | Construction | 2025 |