| Feel Good Ibiza Ltd | Other services | 2018 |
| Felisa Ltd | Construction | 2018 |
| Felix Technologies Ltd | Information & communication | 2007 |
| Fengacu Ltd | Health & social care | 2018 |
| Fenworth Consultants Limited | Information & communication | 1986 |
| Ferrari Property Services Limited | Real estate | 1997 |
| Feynman Tuition Centre Limited | Education | 2022 |
| FHS Consulting Ltd | Professional & scientific | 2019 |
| Fibreglass Flat Roofing Ltd | Construction | 2014 |
| Fidler Investments Limited | Real estate | 2017 |
| Field FX Limited | Information & communication | 2012 |
| Fifteen Plympton Limited | Households | 2021 |
| Film West UK Ltd | Information & communication | 2016 |
| Finance and Accounting Solutions Ltd. | Professional & scientific | 2013 |
| Finance Transformed Ltd | Administrative & support | 2017 |
| Financeshome Ltd | Information & communication | 2011 |
| Financial Measures Ltd | Professional & scientific | 2002 |
| Fincuir Holdings Ltd | Financial services | 2023 |
| Fincuir Ltd | Wholesale & retail | 2023 |
| Finer Limited | Real estate | 2001 |
| Finer Living Care Ltd | Health & social care | 2022 |
| Finest Customs Ltd | Administrative & support | 2024 |
| Finestone Roofers and Decorators Ltd | Construction | 2019 |
| Finvestment Limited | Real estate | 2019 |
| FIR Tree Property Ltd | Real estate | 2018 |
| Fired Earth Music Limited | Professional & scientific | 2009 |
| Firehorse Estates Ltd | Real estate | 2026 |
| Fireworks (Percy Street) Limited | Professional & scientific | 2006 |
| Fireworks Music Limited | Information & communication | 1984 |
| Firman Export Limited | Wholesale & retail | 2013 |
| First AID for Everyone Ltd | Education | 2020 |
| First AID Teaching Limited | Education | 2025 |
| First Call Enterprises Limited | Administrative & support | 2011 |
| First Choice Interiors Consultancy Limited | Administrative & support | 2018 |
| First Graphics Ltd | Manufacturing | 2019 |
| First RAY Consulting Limited | Professional & scientific | 2015 |
| First Stack Ltd | Information & communication | 2019 |
| Firstworks Music International Limited | Information & communication | 2006 |
| Firstworks Music Italia Limited | Information & communication | 2010 |
| Firstworks Music Limited | Information & communication | 2002 |
| Fischer Ventures Ltd | Wholesale & retail | 2020 |
| Fisinternational Ltd | Information & communication | 2019 |
| Fit Tour Ltd | Administrative & support | 2023 |
| Fitness Space Group Limited | Financial services | 2026 |
| Fitness Space Group Trading Limited | Professional & scientific | 2026 |
| Fitness Space Paddington Limited | Arts & recreation | 2023 |
| Fitness Space PT Limited | Arts & recreation | 2023 |
| Fitness Space Wimbledon Limited | Other services | 2017 |
| Fitness Space Woking Limited | Arts & recreation | 2013 |
| Fitzpatrick Fitness Limited | Education | 2019 |
| Five Finger Post Limited | Information & communication | 2012 |
| Five Star Serviced Accommodation Ltd | Real estate | 2021 |
| Five Star Worldwide Ltd | Wholesale & retail | 2026 |
| Fiveways (Ruislip) Limited | Households | 1981 |
| Fiveways Ickenham Road (Freehold) Limited | Households | 2020 |
| FJ Gold Ltd | Real estate | 2024 |
| FJ68 Holdings Limited | Real estate | 2022 |
| Flamin' 8 Limited | Other services | 2016 |
| Flash & Flair Ltd | Professional & scientific | 2026 |
| Flavour Management Limited | Manufacturing | 2017 |
| FLD Chemicals Limited | Wholesale & retail | 1984 |
| Flexi Store Self Storage Limited | Transport & logistics | 2003 |
| Flexiderm Ltd | Wholesale & retail | 2025 |
| Flight Process Limited | Professional & scientific | 2009 |
| Flitwick Construction and Maintenance Limited | Construction | 2015 |
| Flossa Ltd | Wholesale & retail | 2026 |
| Flourishing Hope Co., Ltd | Wholesale & retail | 2024 |
| FLOW28 Ltd | Information & communication | 2026 |
| Flowers by JAY Limited | Wholesale & retail | 2022 |
| Flowgi Ltd | Professional & scientific | 2021 |
| Flux INK Limited | Other services | 2023 |
| FLY2TIME Limited | Administrative & support | 2023 |
| Flybyte Travel and Flight Solutions Ltd | Information & communication | 2020 |
| Flyflydai Ltd | Wholesale & retail | 2025 |
| FML Construction Ltd | Construction | 2021 |
| FMM Rigging Ltd | Construction | 2025 |
| FN Legal Services Limited | Professional & scientific | 2025 |
| FNM Trading Ltd | Wholesale & retail | 2026 |
| FOB Foods Limited | Hospitality | 2019 |
| Focus Heating (London) Ltd | Construction | 2023 |
| Fondy Group Ltd | Information & communication | 2022 |
| Football FUN Factory (Community 136) Limited | Arts & recreation | 2024 |
| Football Future Stars Ltd | Education | 2021 |
| FOR Your Ears Only Limited | Information & communication | 2021 |
| Forever Green Landscaping Limited | Administrative & support | 2016 |
| Forgotten Productions Ltd | Arts & recreation | 2019 |
| Forkin UK Ltd | Wholesale & retail | 2023 |
| Formac Building and Maintenance Ltd | Administrative & support | 2026 |
| Formula Sales Ltd | Information & communication | 2005 |
| Forse Entry Limited | Administrative & support | 2024 |
| Fortunate Technologies Ltd | Information & communication | 2014 |
| Fortune C&L Technology Co., Ltd | Wholesale & retail | 2022 |
| Fortune Lane (U.K.) Limited | Real estate | 2016 |
| Fortynine Productions Ltd | Construction | 2023 |
| Fotia Ltd | Information & communication | 2019 |
| Fotostation Limited | Professional & scientific | 2022 |
| Foundry Food Ltd | Hospitality | 2024 |
| Four Seasons Tree Surgeons Limited | Agriculture & fishing | 2014 |
| FOX Consulting Services Ltd | Professional & scientific | 2022 |
| FOX Technology Ltd | Wholesale & retail | 2018 |