| F&F Car Community Limited | Professional & scientific | 2024 |
| F&H Jewellery Ltd | Wholesale & retail | 2025 |
| F&M Accounting Ltd | Construction | 2021 |
| F&M Construction Limited | Construction | 2017 |
| F&S Al-Hayats Limited | Other services | 2021 |
| F&V Electrical UK Ltd | Construction | 2025 |
| F.A. OST Investments Limited | Construction | 2009 |
| F.A. OST Limited | Wholesale & retail | 1999 |
| F.A. OST Property Limited | Construction | 2020 |
| F.L.M. Recycling Ltd | Water & waste | 2026 |
| F.Morelli Ltd | Hospitality | 2023 |
| F.Ruegger Limited | Other services | 1971 |
| F.Z Transport Ltd | Transport & logistics | 2019 |
| F12 Super Club Limited | Other services | 2018 |
| F24 Competition UK Ltd | Arts & recreation | 2026 |
| F2Z Security Services Limited | Administrative & support | 2024 |
| F420 Limited | Education | 2023 |
| F5 Investments Limited | Wholesale & retail | 2016 |
| F8 Autos Ltd | Wholesale & retail | 2022 |
| FA Global Solutions Ltd | Wholesale & retail | 2026 |
| FA Halal Meat Limited | Wholesale & retail | 2025 |
| FA Logistics & Transport Ltd | Transport & logistics | 2026 |
| FA Restaurants Ltd | Hospitality | 2023 |
| FAB Nanny Services Ltd | Health & social care | 2026 |
| Fabafrik Ltd | Wholesale & retail | 2020 |
| Fabbro Modernism Ltd | Transport & logistics | 2024 |
| Fabeha Fashions Limited | Wholesale & retail | 2008 |
| Fabian Construct Ltd | Construction | 2019 |
| Fabrio Trans Ltd | Transport & logistics | 2019 |
| Facilities Management & Services Ltd | Administrative & support | 2020 |
| Facom Support Services Ltd | Administrative & support | 2016 |
| FAD 4 U Limited | Transport & logistics | 2025 |
| Fade and Blade Luton Ltd | Other services | 2026 |
| Fade District Ltd | Other services | 2025 |
| Fagetrans Ltd | Transport & logistics | 2016 |
| Fahdawan Ltd | Administrative & support | 2026 |
| Fahmm Ltd | Transport & logistics | 2021 |
| Fahsel Cars Ltd | Transport & logistics | 2025 |
| Faidof Ltd | Health & social care | 2018 |
| Faimacor Building Ltd | Construction | 2015 |
| Fair and Square Living Limited | Health & social care | 2018 |
| Fair Delivery Ltd | Transport & logistics | 2019 |
| Fairfax Cleaning Co Ltd | Administrative & support | 2025 |
| Fairfield Care Home Limited | Health & social care | 2025 |
| Fairgain Limited | Professional & scientific | 2015 |
| Fairlane Property Services Ltd | Real estate | 2026 |
| Fairmax UK Ltd | Health & social care | 2019 |
| Fairness Health Care Limited | Administrative & support | 2018 |
| Fairoz Catering Ltd | Hospitality | 2025 |
| Fairoz Group Ltd | Real estate | 2025 |
| Fairoz Holdings Limited | Real estate | 2019 |
| Fairtrade Builders Ltd | Construction | 2015 |
| Fairway Homes (Devon) Limited | Construction | 2026 |
| Fairyland Studios Ltd | Professional & scientific | 2024 |
| Faisal Durani Limited | Manufacturing | 2022 |
| Faisal Durrani Ltd | Transport & logistics | 2022 |
| Faisal Pervaiz Ltd Ltd | Wholesale & retail | 2023 |
| Faith Solutions Ltd | Health & social care | 2022 |
| Faith United Events Ltd | Hospitality | 2025 |
| Faithful Construction Ltd | Construction | 2024 |
| Faiz Ices Ltd | Manufacturing | 2024 |
| Faiz Services Limited | Information & communication | 2016 |
| Faizy Builders Limited | Construction | 2024 |
| Fajar & Yahya Limited | Wholesale & retail | 2025 |
| Fajera Limited | Transport & logistics | 2014 |
| Fajr Properties Ltd | Real estate | 2025 |
| Falafeel House Ltd | Hospitality | 2025 |
| Falafel House Limited | Hospitality | 2024 |
| Falco Aviation Ltd | Professional & scientific | 2014 |
| Falco Luton Limited | Wholesale & retail | 2021 |
| Falcon EYE Security Limited | Administrative & support | 2013 |
| Falconinfra Ltd | Households | 2026 |
| Faldo Road Ltd | Real estate | 2019 |
| Fallow Business Group Ltd | Construction | 2025 |
| Falrix International Limited | Information & communication | 2025 |
| FAM Property Management Ltd | Real estate | 2025 |
| FAM2026 Limited | Real estate | 2026 |
| Famak Incorporated Limited | Wholesale & retail | 2025 |
| Fame Property Ltd | Real estate | 2023 |
| Family and Tribal Matters Ltd | Manufacturing | 2025 |
| Family Choice Fuel (UK) Ltd | Wholesale & retail | 2015 |
| Family Choice GB Property Ltd | Real estate | 2024 |
| Family Choice Global Ltd | Wholesale & retail | 2023 |
| Family Choice Hillcrest SPV Limited | Real estate | 2018 |
| Family Choice KT Limited | Wholesale & retail | 2024 |
| Family Choice Luton Property Ltd | Real estate | 2018 |
| Family Choice Market Ltd | Wholesale & retail | 2022 |
| Family Choice Oakley Ltd | Wholesale & retail | 2016 |
| Family Choice Trading Ltd | Wholesale & retail | 2009 |
| Family Choice UK Property Ltd | Real estate | 2021 |
| Family Cornerstone Ltd | Health & social care | 2020 |
| Family First Property Solutions Ltd | Real estate | 2025 |
| Family Gifts Ltd | Construction | 2022 |
| Family Mediation Centre Ltd | Other services | 2020 |
| Family Solution Centre Ltd | Professional & scientific | 2026 |
| Family Wellbeing Ltd | Extraterritorial | 2025 |
| FAMILY2FAMILY Ltd | Health & social care | 2020 |
| Familychoice Online Ltd | Wholesale & retail | 2025 |
| Familychoiceuk.Com Ltd | Real estate | 2020 |
| Famous Chicken Peri Peri & Pizza Ltd | Hospitality | 2024 |