| Fambash Limited | Wholesale & retail | 2024 |
| Family Star Limited | Health & social care | 2006 |
| Famous Corner Ltd | Hospitality | 2022 |
| Famous Four AI Limited | Financial services | 2021 |
| Fancy Cars Ltd | Transport & logistics | 2025 |
| Farber Ltd | Construction | 2019 |
| Farenden & Lyon Ltd | Administrative & support | 2015 |
| Farhangs Studio Limited | Other services | 2024 |
| Farnworth Investments Limited | Real estate | 2023 |
| Farrugia Ltd | Wholesale & retail | 2025 |
| FAS Testing Ltd | Manufacturing | 2019 |
| Fast Distributors Limited | Financial services | 2013 |
| Fast Visa Solution Ltd | Administrative & support | 2026 |
| Fatboy Chinese Limited | Hospitality | 2023 |
| Father Productions Ltd | Information & communication | 2020 |
| Fatima Barry Ltd | Real estate | 2023 |
| Fatz Lazy Catz Limited | Wholesale & retail | 2017 |
| Favorite Horley Ltd | Administrative & support | 2017 |
| Favorite Penge Ltd | Administrative & support | 2017 |
| Fawngrove Garage Ltd | Wholesale & retail | 2013 |
| Faye's Teeth Ltd | Health & social care | 2021 |
| Fazal Properties Limited | Real estate | 2024 |
| FBQ Property Investments Ltd | Real estate | 2024 |
| FBR Hotel Consulting Limited | Professional & scientific | 2024 |
| FC Imperial Limited | Financial services | 2022 |
| FC Sutton Hker Limited | Education | 2023 |
| Fc&K Group Limited | Financial services | 2023 |
| FCB 1293 Limited | Administrative & support | 1998 |
| Fcia Ltd | Professional & scientific | 2024 |
| FD Animal Care Ltd | Professional & scientific | 2025 |
| FDS Recruitment Ltd | Administrative & support | 2018 |
| FE Waterman Engineering Limited | Manufacturing | 2008 |
| Febta Associates Limited | Health & social care | 2026 |
| Fecel Limited | Professional & scientific | 2025 |
| Fecel Tiktok Live Agency Limited | Professional & scientific | 2025 |
| Felis & TED Cooperation Ltd | Wholesale & retail | 2021 |
| Feni Properties Limited | Real estate | 2018 |
| Fenixone Limited | Administrative & support | 2025 |
| Fenner Construction Ltd | Construction | 2022 |
| Fens Sustainable Projects Limited | Energy | 2020 |
| Fergussons Auto Services Limited | Wholesale & retail | 2009 |
| Ferman Roofing Services Ltd | Construction | 2019 |
| Fettes & Co Accountants Ltd | Professional & scientific | 2016 |
| FGK Construcion Ltd | Construction | 2023 |
| Fhair Ltd | Other services | 2017 |
| FHK Property Management Ltd | Construction | 2021 |
| Fiaes Limited | Wholesale & retail | 2013 |
| Field View (Cheam Road) Management Company Limited | Households | 2023 |
| Fields Care Services Ltd | Health & social care | 2025 |
| Figaro Barber Ltd | Other services | 2024 |
| Fihome Construction Ltd | Construction | 2023 |
| Filemycgt Ltd | Professional & scientific | 2026 |
| Filipina Life Partner Ltd | Other services | 2025 |
| Final 20 Ltd | Professional & scientific | 2019 |
| Finarch Consultancy Ltd | Professional & scientific | 2021 |
| Find and Go Global Limited | Real estate | 2025 |
| Findel (Pensions) Limited | Professional & scientific | 1974 |
| Fine Facet Gems Ltd | Wholesale & retail | 2024 |
| Fine SET Plastering (Surrey) Ltd | Construction | 2019 |
| Finestre Glazing Solutions Ltd | Construction | 2022 |
| Fingertip Controls Limited | Construction | 2012 |
| Finnigans Fish & Grill Limited | Hospitality | 2015 |
| Fino's Kitchen Ltd | Hospitality | 2019 |
| Finops Squad Ltd | Professional & scientific | 2024 |
| Finova Consulting Limited | Information & communication | 2024 |
| Finstrand Limited | Information & communication | 2017 |
| FIO Cooling Ltd | Manufacturing | 2025 |
| Fiona Rennie's Company Limited | Professional & scientific | 2007 |
| Fiore VA Ltd | Professional & scientific | 2025 |
| Fire Detection Systems Ltd | Public administration | 2002 |
| Fire Door Inspection and Repair Limited | Construction | 2025 |
| Fireaway Rosehill Ltd | Hospitality | 2022 |
| Firefly Heating Ltd | Construction | 2022 |
| Firelight Productions Limited | Administrative & support | 2003 |
| Firely Entertainment Ltd | Professional & scientific | 2023 |
| Firesetter Ltd | Information & communication | 2022 |
| Firestream Limited | Hospitality | 2015 |
| Firnas Private Limited | Administrative & support | 2014 |
| Firol Ltd | Information & communication | 2025 |
| First Access Ltd | Real estate | 2022 |
| First Assistance Ltd | Health & social care | 2020 |
| First Call Employment Limited | Administrative & support | 1999 |
| First Call Hire Limited | Water & waste | 2016 |
| First Car World Ltd | Extraterritorial | 2022 |
| First Flowers Direct Limited | Wholesale & retail | 1995 |
| First Little Steps Day Nursery Ltd | Education | 2021 |
| First Rate Collectibles Ltd | Wholesale & retail | 2023 |
| First RAY Technologies Ltd | Information & communication | 2014 |
| First Special Steps Ltd | Health & social care | 2025 |
| First WE Create Ltd | Information & communication | 2018 |
| First-Web Ltd | Professional & scientific | 2008 |
| First-Web Network Services Limited | Information & communication | 1999 |
| Firstlegend Ltd | Hospitality | 2001 |
| Firstlink Investments Limited | Real estate | 2006 |
| Firza Music Ltd | Arts & recreation | 2024 |
| Fish Data Limited | Administrative & support | 2024 |
| FIU Solutions Ltd | Other services | 2017 |
| Five Against One Ltd | Information & communication | 2020 |
| Five Elms Underwriting Ltd | Extraterritorial | 2023 |
| Five Faces Limited | Real estate | 2025 |