| Fast Food T/A Super Pizza Limited | Hospitality | 2024 |
| Fast Stitch RH Ltd | Manufacturing | 2025 |
| Fast Track Holdings 2 Ltd | Administrative & support | 2018 |
| Fast WOK Kitchen Ltd | Hospitality | 2026 |
| Fastaward Limited | Administrative & support | 1993 |
| Fastbridge Finance Limited | Professional & scientific | 2007 |
| Fastnalign Ltd | Manufacturing | 2023 |
| Fastpark Holdings Limited | Financial services | 2021 |
| Faststream Appointments Limited | Administrative & support | 2000 |
| Faststream Holdings Limited | Professional & scientific | 2008 |
| Faststream Personnel Limited | Administrative & support | 2000 |
| Faststream Recruitment Limited | Administrative & support | 1999 |
| Faststream Search and Selection Limited | Administrative & support | 2000 |
| Fatahe Barbers Ltd | Other services | 2024 |
| Fatara Motor Holdings Ltd | Wholesale & retail | 2021 |
| Fatboy Motorcycle Training Ltd | Education | 2019 |
| Fatboy Training Ltd | Education | 2023 |
| Fatcash Entertainment Limited | Arts & recreation | 2018 |
| Fate in Motion Limited | Information & communication | 2019 |
| Faulkner Fabrications Limited | Manufacturing | 2004 |
| Favolux Ltd | Wholesale & retail | 2024 |
| Favoralsurgeryandimplants Ltd | Health & social care | 2025 |
| Favour N Grace Ltd | Hospitality | 2023 |
| Fawad Brothers Private Limited | Wholesale & retail | 2023 |
| Fawley Sports C.I.C. | Arts & recreation | 2025 |
| Fawley Waterside Limited | Construction | 2014 |
| Fawley Waterside Management Limited | Professional & scientific | 2014 |
| Fawn Research Ltd | Information & communication | 2026 |
| Fayley Customs Ltd | Manufacturing | 2022 |
| Fazli Properties Ltd | Real estate | 2024 |
| FB Cafe and Catering Ltd | Hospitality | 2026 |
| FB Nominees Limited | Financial services | 2014 |
| FC Developments Ltd | Construction | 2021 |
| FC FIN Limited | Financial services | 2020 |
| Fccf Limited | Real estate | 2021 |
| FCE Direct Sales Limited | Manufacturing | 2025 |
| FCW Homes Ltd | Real estate | 2024 |
| FD Online Limited | Extraterritorial | 2015 |
| FD Services (UK) Limited | Professional & scientific | 2005 |
| Fdfs Resins and Screed Ltd | Construction | 2019 |
| Feast Home Delivery Service Limited | Hospitality | 2003 |
| Feather PEN Contracting Ltd | Construction | 2026 |
| Featherstone Business Consulting Ltd | Professional & scientific | 2025 |
| Federation of Holistic Therapists | Other services | 1993 |
| Fedor Management Limited | Extraterritorial | 2017 |
| Feed the Community Program C.I.C. | Transport & logistics | 2021 |
| Feedback Ferret Limited | Information & communication | 1986 |
| Feifan International Consulting Company Limited | Education | 2024 |
| Fejibet Carer and Advisers Ltd | Health & social care | 2023 |
| Felater Ukeig | | 2020 |
| Felberrjl Limited | Information & communication | 2018 |
| Felden Limited | Other services | 2007 |
| Felix Developments Limited | Construction | 2016 |
| Felix Light Landscaping Limited | Administrative & support | 2023 |
| Felton Services Ltd | Wholesale & retail | 2021 |
| Femakiode Limited | Health & social care | 2019 |
| Femille Limited | Wholesale & retail | 2026 |
| Fenbrooke Enterprises Limited | Professional & scientific | 1998 |
| Fenda Consulting Ltd | Transport & logistics | 2015 |
| Fennell Maintenance Ltd | Professional & scientific | 2022 |
| Fennyboy Ltd | Extraterritorial | 2020 |
| Fenturi Limited | Information & communication | 2002 |
| Fenwick Court NO 1 RTM Company Ltd | Households | 2016 |
| Fenwick Court NO 2 RTM Company Ltd | Households | 2016 |
| Fergrant Capital Ltd | Financial services | 2021 |
| Ferguson Accountancy Services Limited | Professional & scientific | 2025 |
| Fergusson Property Consultancy Limited | Professional & scientific | 2021 |
| Fergyish Enterprise Limited | Transport & logistics | 2019 |
| Feria Limited | Professional & scientific | 2007 |
| Fern Property Ltd | Construction | 2014 |
| Fernacre Property Ltd | Real estate | 2001 |
| Fernandes Estates Limited | Real estate | 2022 |
| Fernandez Group Ltd | Construction | 2024 |
| Ferndale Landscaping Ltd | Construction | 2023 |
| Fernham Limited | Professional & scientific | 1983 |
| Fernstone Electrical Limited | Construction | 2017 |
| Ferry House Property Ltd | Real estate | 2023 |
| Fertility Minds Ltd | Information & communication | 2025 |
| Ferytrans Limited | Transport & logistics | 2011 |
| Fesnak Limited | Hospitality | 2025 |
| Festina Events Ltd | Wholesale & retail | 2021 |
| Festival Campsites Ltd | Hospitality | 2020 |
| FEW Dollars Moore Limited | Information & communication | 2013 |
| FEZ Tattoo Limited | Arts & recreation | 2022 |
| FF Carpentry Limited | Construction | 2015 |
| FFF Dave North Limited | Arts & recreation | 2025 |
| Ffqd Ltd | Information & communication | 2025 |
| FG Beverage Strategy Ltd | Professional & scientific | 2026 |
| FG Portfolio Ltd | Real estate | 2024 |
| FGH Inns Limited | Hospitality | 2007 |
| FHG Law Ltd | Professional & scientific | 2016 |
| Fiander ETL (MG) Limited | Financial services | 2025 |
| Fiander ETL Audit Limited | Professional & scientific | 2025 |
| Fiander ETL Limited | Professional & scientific | 2025 |
| Fiander Tovell (ARJ) Limited | Financial services | 2017 |
| Fiander Tovell Group Limited | Financial services | 2017 |
| Fiander Tovell Limited | Professional & scientific | 2017 |
| Fiander Tovell Southampton LLP | | 2002 |
| Fibre Network Provisions UK Ltd | Information & communication | 2023 |
| Fibre Security Systems (UK) Limited | Administrative & support | 2020 |