| Firwood Consulting Limited | Professional & scientific | 2020 |
| Fisher King Associates Limited | Professional & scientific | 2010 |
| Fishers Pond Management Services Limited | Wholesale & retail | 1998 |
| Fit by Bella Limited | Health & social care | 2025 |
| Fitzharris Holdings Limited | Real estate | 2022 |
| Fixings First Ltd | Wholesale & retail | 2017 |
| Fiyo Property Upgrades Ltd | Construction | 2020 |
| FK Installations Ltd | Construction | 2018 |
| Flamingo Clothing Ltd | Manufacturing | 2023 |
| Flare Heating and Cooling Limited | Construction | 2004 |
| Flavourminds Ltd | Professional & scientific | 2026 |
| Flawless Football Coaching Ltd | Arts & recreation | 2024 |
| Fleet Projects Limited | Professional & scientific | 2005 |
| Fleureleanorgreen Ltd | Information & communication | 2024 |
| Flex Admin Limited | Real estate | 2014 |
| Flexford Homes Ltd | Real estate | 2023 |
| Flight Golf Limited | Wholesale & retail | 2023 |
| Flintstream Analysis Ltd | Professional & scientific | 2024 |
| Floorplan Letting Agents Ltd | Real estate | 2021 |
| Floorplan Lettings Ltd | Real estate | 2018 |
| Floral Essential Limited | Wholesale & retail | 1997 |
| Flourishing Heights Ltd | Wholesale & retail | 2025 |
| Flow Yacht Design Limited | Professional & scientific | 2010 |
| Flowers From the Farm Limited | Other services | 2011 |
| Flowers Online Limited | Wholesale & retail | 2010 |
| Flowers.Co.Uk Limited | Wholesale & retail | 2009 |
| Flowstock Limited | Extraterritorial | 2013 |
| Floyd Homes Limited | Real estate | 2016 |
| Fluid Vision Systems Limited | Information & communication | 1999 |
| Fluidity Insurance Consultants Ltd | Financial services | 2013 |
| Fluo Finance Limited | Information & communication | 2024 |
| Fluo Finance SPV Limited | Information & communication | 2024 |
| Fluo Financial Services Limited | Information & communication | 2024 |
| FLY20 Ltd | Professional & scientific | 2022 |
| Flying at LEE on Solent Limited | Arts & recreation | 2007 |
| Flynn the Moment Limited | Transport & logistics | 2023 |
| Fodder Mongers South Limited | Wholesale & retail | 2017 |
| Food & Beyond Holdings Limited | Professional & scientific | 2017 |
| Food Allergy Aware Limited | Health & social care | 2016 |
| Food&Beyond Limited | Hospitality | 2015 |
| Footsense Podiatry Ltd | Health & social care | 2019 |
| Footy Feet Limited | Arts & recreation | 2018 |
| FOR Truck Sake Ltd | Wholesale & retail | 2025 |
| FOR Your Pet Limited | Wholesale & retail | 2025 |
| Forage and Find Limited | Wholesale & retail | 2021 |
| Forensic Outcomes Ltd | Professional & scientific | 2017 |
| Forest Edge Launderette Limited | Other services | 1999 |
| Forest Financial Services Ltd | Financial services | 2018 |
| Forestgreen PVT Ltd | Manufacturing | 2026 |
| Forge Trading (UK) Ltd | Wholesale & retail | 2000 |
| Forgex Limited | Professional & scientific | 2021 |
| Foris Horticultural Limited | Administrative & support | 2023 |
| Forma 4 Properties Ltd | Construction | 2025 |
| Former Methodist Church Weymouth Ltd | Households | 2025 |
| Formula Clinic Performance Ltd | Arts & recreation | 2026 |
| Formula ZOE Girdis Ltd | Health & social care | 2010 |
| Forrest & Fraser Ltd | Extraterritorial | 2022 |
| Fortis IBA (Calvert) Limited | Water & waste | 2019 |
| Fortis IBA (South East) Limited | Water & waste | 2019 |
| Fortis IBA DC Limited | Water & waste | 2026 |
| Fortis IBA Holdco Limited | Water & waste | 2019 |
| Fortis IBA Limited | Water & waste | 2017 |
| Fortis Maintenance Ltd | Construction | 2025 |
| Fosseway Garden Centre Limited | Wholesale & retail | 2007 |
| Foster Brooke Investment Group Ltd | Financial services | 2025 |
| Foster Risk Solutions Ltd | Water & waste | 2025 |
| Foundation Floors Ltd | Construction | 2022 |
| Foundry Lane Preschool Limited | Education | 2023 |
| Four Twelve New Homes Ltd | Construction | 2020 |
| Foursix Advisory Limited | Professional & scientific | 2023 |
| FOX Property Ventures Limited | Real estate | 2025 |
| Foxglove Atelier Limited | Manufacturing | 2024 |
| Foxholes Services Limited | Construction | 2022 |
| Foxhunter Estates Limited | Construction | 2018 |
| Framework Twelve Ltd | Professional & scientific | 2021 |
| Frank S. Foot & SON (Machinery) Limited | Wholesale & retail | 1978 |
| Frankie & GUY Limited | Other services | 2008 |
| Franklin Marine Limited | Professional & scientific | 2013 |
| Franklin Ventures Limited | Construction | 2018 |
| Frecco Food & Beverage Limited | Manufacturing | 2009 |
| Freedom Air Conditioning Trustee Company Limited | Professional & scientific | 2024 |
| Freelance Doctors Ltd | Health & social care | 2014 |
| Fresh Cuts Tree & Landscaping Services Ltd | Agriculture & fishing | 2021 |
| Fresh Start for Hens CIC | Agriculture & fishing | 2019 |
| Freshfields Estate Agents Ltd | Real estate | 2026 |
| Fridgenius Limited | Manufacturing | 1997 |
| Frisby Catering Ltd | Hospitality | 2018 |
| Frog & Frigate Ltd | Hospitality | 2015 |
| From Zero to Hero in Medical Education Ltd | Information & communication | 2024 |
| Front ROW Projects Limited | Construction | 2013 |
| Frontline Energy and Environmental Ltd | Professional & scientific | 2010 |
| Frontline Inns Limited | Hospitality | 2008 |
| Frontporch Agility Ltd | Professional & scientific | 2022 |
| Frosts Garden Centre Limited | Wholesale & retail | 1976 |
| Fryern Estates Limited | Real estate | 1999 |
| Fryern Limited | Wholesale & retail | 2025 |
| FS Technologies Ltd | Manufacturing | 2012 |
| Ftsn Estates Limited | Financial services | 2019 |
| FTW Healthcare Limited | Health & social care | 2014 |
| FTY FLY Ltd | Extraterritorial | 2022 |