| Foothold International Limited | Professional & scientific | 2021 |
| Foothold Services Limited | Financial services | 2021 |
| Footprint Experience Ltd | Administrative & support | 2008 |
| Footprint Holdings Limited | Administrative & support | 2010 |
| Footprint Media Group Limited | Administrative & support | 2009 |
| Footprint Signs and Graphics Limited | Professional & scientific | 2008 |
| Footprint Ventures Limited | Professional & scientific | 2019 |
| FOR Smart Tech Ltd | Wholesale & retail | 2025 |
| FOR the Record CIC | Information & communication | 2025 |
| Forad Limited | Professional & scientific | 2016 |
| Force Facilities Management Limited | Administrative & support | 2025 |
| Forde Mcgregor Consulting Ltd | Information & communication | 2019 |
| Fordey & Strong Ltd | Real estate | 2025 |
| Fordham Barbers Limited | Other services | 2023 |
| Fore Hill ELY LLP | | 2017 |
| Forefront RF Ltd | Manufacturing | 2020 |
| Foresee HR Solutions Limited | Administrative & support | 2024 |
| Forest Holding Group Ltd | Manufacturing | 2025 |
| Forest Park Chisbury Management Company Limited | Households | 1984 |
| Forest Park Residents Association Limited | Households | 1985 |
| Forestmap.Ai Ltd | Information & communication | 2024 |
| Forestscapes Design Limited | Wholesale & retail | 2009 |
| Forever Victory Limited | Information & communication | 2025 |
| Forevermore Limited | Wholesale & retail | 2020 |
| Forge Farming Ltd | Professional & scientific | 2012 |
| Forge Green Limited | Agriculture & fishing | 2023 |
| Forgebyte Ltd | Information & communication | 2025 |
| Forgemesh Ltd | Information & communication | 2026 |
| Forghici Composites Ltd | Manufacturing | 2022 |
| Form Dental Ltd | Health & social care | 2024 |
| Form the Future C.I.C. | Administrative & support | 2015 |
| Formiga Invest Ltd | Construction | 2023 |
| Formosa Links Ltd | Wholesale & retail | 2022 |
| Formunext Solutions Ltd | Professional & scientific | 2025 |
| Forrest IB Ltd | Professional & scientific | 2019 |
| Forrest Lancaster Translation Services Limited | Information & communication | 2024 |
| Forsdair Properties Limited | Real estate | 2017 |
| Fortas Consulting Limited | Professional & scientific | 2012 |
| Forte Foods Ltd | Wholesale & retail | 2021 |
| Forte Wealth Partners Limited | Financial services | 2026 |
| Forthco.Io Ltd | Administrative & support | 2010 |
| Fortify Solutions Cambridge Limited | Information & communication | 2023 |
| Fortify the Forests Limited | Professional & scientific | 2023 |
| Fortress Holdings Group Limited | Financial services | 2020 |
| Fortune Advisory Limited | Professional & scientific | 2013 |
| Fortune Hero Trading Limited | Wholesale & retail | 2021 |
| Fortunebirds Limited | Arts & recreation | 2025 |
| Fortunes Investment Limited | Real estate | 2021 |
| Forty Two the Performance Company Limited | Administrative & support | 2002 |
| Fortūna Wealth Management Group Limited | Real estate | 2021 |
| Forward Quantitative Asset Management Ltd | Information & communication | 2024 |
| Forwell Industry Co., Ltd | Extraterritorial | 2023 |
| Fosca Consulting Ltd | Professional & scientific | 2019 |
| Foster Architects Limited | Professional & scientific | 2016 |
| Foster Way Residents Company Ltd. | Households | 2012 |
| Fotia Global Ltd | Hospitality | 2026 |
| Fotoinsight Ltd | Professional & scientific | 2003 |
| Foundation for Genomics & Population Health | Health & social care | 2006 |
| Foundation for Information Policy Research | Professional & scientific | 1998 |
| Foundation PR Ltd | Administrative & support | 2008 |
| Founderx Ltd | Professional & scientific | 2022 |
| Foundries.Io Limited | Information & communication | 2017 |
| Foundry 5 Limited | Information & communication | 2019 |
| Foundry Mews Management Company Limited | Households | 1990 |
| Foundry Productions Limited | Arts & recreation | 2019 |
| Foundry Works Design Limited | Professional & scientific | 2024 |
| Fountain Capital UK Ltd | Financial services | 2026 |
| Fountain Media Ltd | Professional & scientific | 2019 |
| Fountainhall Laboratories Limited | Information & communication | 2026 |
| Four Lamps Limited | Professional & scientific | 2013 |
| Fourboss Yachting Co. Ltd | Extraterritorial | 2025 |
| Fourth Brother Ltd | Wholesale & retail | 2026 |
| Fov-Lab Ltd | Other services | 2018 |
| Fovargue-Davies Konzelmann Limited | Information & communication | 2014 |
| FOX Meadow March Limited | Households | 2025 |
| FOX Plumbing and Heating (Cambridge) Limited | Construction | 2018 |
| Foxa Vision Ltd | Real estate | 2018 |
| Foxborough Farming Limited | Agriculture & fishing | 2017 |
| Foxcotte Fencing Limited | Wholesale & retail | 2015 |
| Foxcroft International Ltd | Wholesale & retail | 2010 |
| Foxes Bridge Ltd | Real estate | 2012 |
| Foxgloves Management Limited | Real estate | 1987 |
| Foxhall Travel Ltd | Administrative & support | 2023 |
| Foxhay Limited | Manufacturing | 2017 |
| Foxhorn Ltd | Hospitality | 2025 |
| Foxton Cars Ltd | Other services | 2022 |
| Foxton Pre-School | Education | 2008 |
| Foxton Vehicles Ltd | Wholesale & retail | 2025 |
| Foxtonmotors Limited | Wholesale & retail | 2025 |
| FOY Construction (Cambridge) Ltd | Construction | 2024 |
| FP BIO Limited | Administrative & support | 2023 |
| FP Opera Limited | Professional & scientific | 2015 |
| FR Car Security and Carrosserie Limited | Wholesale & retail | 2025 |
| Frameshift Strategy Limited | Professional & scientific | 2024 |
| Framework Central Ltd | Arts & recreation | 2016 |
| Frameworks Education Group Limited | Education | 2017 |
| Frameworks Productions Ltd | Information & communication | 2025 |
| France Reading Saint-Fez Bioengineering Limited | Mining & quarrying | 2024 |
| Frances Court Residents Association (Sunninghill) RTM Company Limited | Households | 2005 |
| Francesca DB Photography Ltd | Professional & scientific | 2014 |