| Fajesti Limited | Hospitality | 2011 |
| Fala Homes Ltd | Real estate | 2021 |
| Family Properties LLP | | 2023 |
| Famly and Friends Limited | Wholesale & retail | 2024 |
| Famlyandfriendsinvestment Limited | Construction | 2025 |
| Fancy Ltd | Wholesale & retail | 2024 |
| Fantastico Cleaning Ltd | Administrative & support | 2021 |
| Farms and Gardens Limited | Administrative & support | 2003 |
| Farnham Jewellers Limited | Wholesale & retail | 2006 |
| Fashionbyanne Ltd | Wholesale & retail | 2022 |
| Fast Trak Services Ltd | Administrative & support | 2024 |
| FAVOURBLUE71 Ltd | Professional & scientific | 2021 |
| Favoursllc Ltd | Professional & scientific | 2019 |
| Fayrland Limited | Manufacturing | 2020 |
| Fays Flowers Growers Ltd | Agriculture & fishing | 2023 |
| Fazl's Consultancy Limited | Health & social care | 2020 |
| FCC Investments Ltd | Real estate | 2023 |
| Fclg Limited | Extraterritorial | 2019 |
| Fclgroup Limited | Extraterritorial | 2019 |
| Feast Grazing Ltd | Hospitality | 2022 |
| Fedchain Technologies Limited | Wholesale & retail | 2025 |
| Feral Hamster Gifting Ltd | Wholesale & retail | 2021 |
| Ferguson Hull Limited | Professional & scientific | 1958 |
| Ferme Friends Management Company Limited | Households | 1986 |
| Fewcott Healthcare Limited | Health & social care | 2003 |
| Feynlab UK & Europe Ltd | Wholesale & retail | 2018 |
| Fibrescope Inspection Services Ltd | Professional & scientific | 2000 |
| Fides Projects Limited | Information & communication | 2011 |
| Fido AI Limited | Financial services | 2022 |
| Fido Tech Ltd | Information & communication | 2014 |
| Field Supplies Ltd | Professional & scientific | 2026 |
| Fifield Software Systems Limited | Information & communication | 1984 |
| Fifth Sense | Health & social care | 2016 |
| FIFTY50 Creative Limited | Other services | 2004 |
| Filament Marketing Ltd | Professional & scientific | 2017 |
| File Purity Ltd | Information & communication | 2020 |
| Filmeraki Studios Limited | Information & communication | 2024 |
| Fimdok Limited | Health & social care | 2024 |
| Finance Insight Consulting Ltd | Professional & scientific | 2020 |
| Finna Group Ltd | Administrative & support | 2021 |
| Fire Events Limited | Professional & scientific | 2002 |
| Fired UP Fitness Limited | Arts & recreation | 2025 |
| Firmus Finesse Logistics Ltd | Transport & logistics | 2021 |
| First Choice Medical Limited | Transport & logistics | 2020 |
| First Place Finish Limited | Construction | 2009 |
| First Solution Carpentry Ltd | Construction | 2023 |
| Firth Property Investments Ltd | Real estate | 2023 |
| Fishbone Design Limited | Arts & recreation | 2000 |
| Fitgo Auto Care Ltd | Wholesale & retail | 2025 |
| Fitnessgenes Ltd | Professional & scientific | 2013 |
| Fitzgerald Associates Dental Practice Limited | Health & social care | 2011 |
| Five Elements Veterinary Acupuncture Limited | Professional & scientific | 2017 |
| FK GAS & Heating Limited | Construction | 2025 |
| Flare.Io Limited | Information & communication | 2024 |
| Flash Focus Photography Limited | Professional & scientific | 2025 |
| Flashbulb Holdings Limited | Professional & scientific | 2014 |
| Fleet Claims Administration Limited | Information & communication | 1987 |
| Fleet Claims Limited | Extraterritorial | 1995 |
| Fleet Licence Check Limited | Extraterritorial | 2014 |
| Fletchers Carpets Limited | Construction | 2019 |
| Flexible Funding Limited | Financial services | 2017 |
| Floortek Supplies Ltd | Wholesale & retail | 2024 |
| Flora Cleaners Limited | Construction | 2024 |
| Florea Motors Limited | Manufacturing | 2018 |
| Flote Ltd | Hospitality | 2020 |
| Flourish Oxford Ltd | Education | 2020 |
| Flourishd. Ltd | Wholesale & retail | 2024 |
| Flowrap Systems Limited | Manufacturing | 2006 |
| Fltr Coffee Ltd | Wholesale & retail | 2016 |
| FLY by Media Ltd | Administrative & support | 2017 |
| FLY Wings Transport Ltd | Transport & logistics | 2024 |
| Flynn Creative Limited | Other services | 2015 |
| Flyt Consulting Limited | Professional & scientific | 2025 |
| Fogo Power Systems Limited | Extraterritorial | 2016 |
| Fontwell Oaks Limited | Professional & scientific | 2018 |
| Food + Drink Limited | Hospitality | 2009 |
| Foodylicious Limited | Wholesale & retail | 2004 |
| FOR the Power of 7 Limited | Professional & scientific | 2021 |
| Forest Canopy Foundation | Agriculture & fishing | 2020 |
| Form Consulting Ltd | Professional & scientific | 2001 |
| Formware Limited | Information & communication | 2024 |
| Fortfield Property Limited | Real estate | 2026 |
| FOUNDATIONS4GROWTH Ltd | Administrative & support | 2009 |
| Four & Seven Ltd | Information & communication | 2025 |
| Four ARE Ltd | Real estate | 2020 |
| Four Elements Artwork Ltd | Administrative & support | 2019 |
| Four Leaf Clover Travel Service Limited | Transport & logistics | 2023 |
| FOX House Cottages Ltd | Real estate | 2020 |
| FOX Insight Limited | Professional & scientific | 2025 |
| Foxbrush Ltd | Professional & scientific | 2023 |
| Foxhue Ltd | Information & communication | 2024 |
| FP Co-Living Ltd | Real estate | 2024 |
| FPT Software United Kingdom Ltd. | Information & communication | 2019 |
| Fractional GC Limited | Administrative & support | 2023 |
| Francine`S Salon Ltd | Other services | 2007 |
| Francis Hamel Limited | Arts & recreation | 2014 |
| Frankie's IT Solutions Limited | Information & communication | 1998 |
| Franklin Hammond - Career Navigators Ltd | Professional & scientific | 2023 |
| Frebo Marketing Ltd | Extraterritorial | 2014 |
| Fred Cowgill VAT and Customs Consultancy Ltd | Professional & scientific | 2015 |