| Foreacre SPV 3 Limited | Construction | 2025 |
| Foreground Goods Limited | Wholesale & retail | 2025 |
| Foreman Developments Limited | Construction | 2012 |
| Foreman's GIN & Beer IT Limited | Hospitality | 2019 |
| Foremost Barclay Limited | Administrative & support | 2010 |
| Forensic Assessment Training UK Limited | Education | 2023 |
| Forensit Software Limited | Information & communication | 2021 |
| Foresight Medical Centre Ltd | Health & social care | 2010 |
| Foresight Premier Law Ltd | Professional & scientific | 2020 |
| Foresight Thermal Imaging Limited | Professional & scientific | 2022 |
| Forest & Stone Ltd | Manufacturing | 2025 |
| Forest Consultants Ltd | Information & communication | 2023 |
| Forest Design Services Ltd | Construction | 2019 |
| Forester Thornton Ltd | Professional & scientific | 2023 |
| Forestglade Limited | Administrative & support | 2000 |
| Forever Enhanced Training Academy Ltd | Education | 2026 |
| Forevergreen Accountancy Ltd | Professional & scientific | 2021 |
| Forge Earth Limited | Financial services | 2026 |
| Forge Instinct Ltd | Information & communication | 2026 |
| Forge Pilates Ltd | Education | 2025 |
| Forge Properties Group Limited | Construction | 2017 |
| Forge Technologies Group Limited | Information & communication | 2026 |
| Forged in Nature Ltd | Hospitality | 2025 |
| Forget ME NOT Tea Rooms LLP | | 2018 |
| Forgotten Circus School Limited | Education | 2017 |
| Fork in the Rose Ltd | Hospitality | 2020 |
| Forkes Stained Glass Limited | Construction | 2007 |
| Forlita Building Renovations Ltd | Construction | 2026 |
| Form Ventures II (Carry) LLP | | 2021 |
| Form Ventures II (GP) LLP | | 2021 |
| Form Ventures II LP | | 2021 |
| Form Ventures Limited | Financial services | 2018 |
| Formwork Solutions (UK) Ltd | Construction | 2006 |
| Formysin Designs Ltd | Wholesale & retail | 2025 |
| Fornax (North East) Limited | Water & waste | 2020 |
| Fornax Environmental Solutions Ltd | Financial services | 2019 |
| Fornax Finco 1 Limited | Financial services | 2020 |
| Forncett Festival CIC | Arts & recreation | 2026 |
| Forseti Law Ltd | Other services | 2017 |
| Forsetti Global Ltd | Arts & recreation | 2016 |
| Forster Hill Ltd | Construction | 2019 |
| Fort Systems Ltd | Construction | 2020 |
| Forte Farriery Ltd | Other services | 2014 |
| Fortescue Avenue Management Limited | Real estate | 2016 |
| Forthright Legal Solutions Limited | Professional & scientific | 2024 |
| Forto Media Limited | Information & communication | 2020 |
| Fortress PAY Limited | Administrative & support | 2011 |
| Fortress Recruitment Limited | Administrative & support | 2012 |
| Fortuna Property Trading Limited | Real estate | 2015 |
| Forty Two Fold Limited | Information & communication | 2025 |
| Foss Financial Group Ltd | Financial services | 2025 |
| Fosse NOR SO Ltd | Construction | 2019 |
| Fosse RID CR Ltd | Construction | 2019 |
| Foster Harrison Farms Limited | Agriculture & fishing | 1955 |
| Foster's Computer Services Limited | Information & communication | 1997 |
| Fosters Investment Properties Limited | Hospitality | 2017 |
| Fosters Solicitors LLP | | 2018 |
| Fotofetti Ltd | Wholesale & retail | 2023 |
| Foulger Warehousing Ltd | Transport & logistics | 2004 |
| Foundry Nurseries Limited | Wholesale & retail | 2004 |
| Fountain Marketing Group Limited | Extraterritorial | 2016 |
| Fountain Marketing Limited | Extraterritorial | 2019 |
| Fountain Partnership Ltd | Professional & scientific | 2011 |
| Four Agency Ltd | Extraterritorial | 2008 |
| Four Day Week Ltd | Administrative & support | 2018 |
| Four Legs and Two Limited | Wholesale & retail | 2025 |
| Four Shore Retreats Ltd | Hospitality | 2024 |
| Fourstar Refrigeration Company Limited | Manufacturing | 2000 |
| Fourteen Fifty Nine Limited | Professional & scientific | 2012 |
| Fowl Farm Energy Centre Limited | Energy | 2023 |
| FOX & Foxy Ltd | Hospitality | 2021 |
| FOX & Lawry Ltd | Real estate | 2025 |
| FOX & Wood Ltd | Financial services | 2021 |
| FOX and Hounds (Great Moulton) Ltd | Hospitality | 2016 |
| FOX Associates (Building Surveyors and Project Managers) Ltd | Professional & scientific | 2010 |
| FOX Carpentry & Developments Ltd | Construction | 2023 |
| FOX Carpentry&Construction Ltd | Manufacturing | 2022 |
| FOX Dwellings Limited | Real estate | 2024 |
| FOX Fitness LLP | | 2023 |
| FOX Joinery Limited | Manufacturing | 2014 |
| FOX Real Property Limited | Real estate | 2003 |
| Foxandhoundsgtmn Limited | Hospitality | 2018 |
| Foxco Limited | Professional & scientific | 2022 |
| Foxglove & Finch - F&F Ltd | Wholesale & retail | 2024 |
| Foxley-Bush Ltd | Wholesale & retail | 2020 |
| Foxmagna Limited | Professional & scientific | 2002 |
| Foxwells Management Company Limited | Households | 2018 |
| Foxwood Trading Norwich Limited | Manufacturing | 2015 |
| FPB Properties Ltd | Construction | 2025 |
| FPK Products Limited | Wholesale & retail | 2020 |
| Fpseng Limited | Professional & scientific | 2023 |
| FQ Massive Ltd | Real estate | 2022 |
| Fqaa Limited | Hospitality | 2017 |
| FR Scaffolding Limited | Construction | 2006 |
| FR20 Ltd | Households | 2019 |
| FRA Projects Ltd | Agriculture & fishing | 2018 |
| Fractal Data Limited | Information & communication | 2013 |
| Fralani Logistics Ltd | Transport & logistics | 2025 |
| Fram Consulting Ltd | Professional & scientific | 2019 |
| Fram Renovation Services Ltd | Real estate | 2026 |